> This is part 1 of 4 of the full documentation (pages 1–100 of 357).
> The content is paginated: fetch every part to see all of it.
> Next part: https://help.aranet.com/llms-full.txt/1
> Page index: https://help.aranet.com/llms.txt

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
This site has an agentic ask interface you may use to query the documentation dynamically by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://help.aranet.com/index.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

---

# Aranet - For Home

### Browse by product

Find quick setup guides, troubleshooting steps, and answers to common questions for your Aranet Home devices.\
Whether you're installing your sensor for the first time or solving a connection issue — we’re here to help.

<table data-view="cards"><thead><tr><th></th><th data-hidden data-card-target data-type="content-ref"></th><th data-hidden data-card-cover data-type="image">Cover image</th></tr></thead><tbody><tr><td>Aranet4</td><td><a href="https://help.aranet.com/aranet4/">English</a></td><td data-object-fit="contain"><a href="https://assets.aranet.com/images/Aranet4_HOME_F_900x900_5KwWDL4.original.webp">https://assets.aranet.com/images/Aranet4_HOME_F_900x900_5KwWDL4.original.webp</a></td></tr><tr><td>Aranet Rn+</td><td><a href="https://help.aranet.com/aranet-rn+/">English</a></td><td data-object-fit="contain"><a href="https://assets.aranet.com/images/Radon_PRO_Plus_C.original.webp">https://assets.aranet.com/images/Radon_PRO_Plus_C.original.webp</a></td></tr><tr><td>Aranet Radon One</td><td><a href="https://help.aranet.com/aranet-rn-one/">English</a></td><td data-object-fit="contain"><a href="https://assets.aranet.com/images/Radon_One.original.webp">https://assets.aranet.com/images/Radon_One.original.webp</a></td></tr><tr><td>Aranet Radiation sensor</td><td><a href="https://help.aranet.com/aranet-radiation-sensor/">English</a></td><td data-object-fit="contain"><a href="https://assets.aranet.com/images/Aranet_Radiation_900x900_C.original.webp">https://assets.aranet.com/images/Aranet_Radiation_900x900_C.original.webp</a></td></tr><tr><td>Aranet2</td><td><a href="https://help.aranet.com/aranet2/">English</a></td><td data-object-fit="contain"><a href="https://assets.aranet.com/images/Aranet2_900x900_C.original.webp">https://assets.aranet.com/images/Aranet2_900x900_C.original.webp</a></td></tr></tbody></table>


# Aranet4 Home

The **Aranet4** is a portable indoor air quality monitor designed to measure CO₂ concentration, temperature, relative humidity, and atmospheric pressure in real time. Featuring a clear e-ink display and long battery life, it provides continuous monitoring and visual alerts to help maintain healthy indoor environments. This section provides product information, technical specifications, firmware details, usage guidance, and troubleshooting instructions to ensure accurate measurements and reliable operation.

{% columns %}
{% column %}
{% content-ref url="/pages/5uOPCMxDV0nuQFZIxsOA" %}
[General](/aranet4/aranet4-home/general)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
{% content-ref url="/pages/Eb48RXboq5BUqacbweba" %}
[Manuals & Firmware](/aranet4/aranet4-home/manuals-and-firmware)
{% endcontent-ref %}
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column %}
{% content-ref url="/pages/knB0Ea8lcEqpA41cpKwO" %}
[Usage & Measurements](/aranet4/aranet4-home/usage-and-measurements)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
{% content-ref url="/pages/TYEGG4z9BtPWyhju7c9E" %}
[Troubleshooting](/aranet4/aranet4-home/troubleshooting)
{% endcontent-ref %}
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column %}
{% content-ref url="/pages/5vI2C8DVGVKtCxOnshUk" %}
[Device Care](/aranet4/aranet4-home/device-care)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
{% content-ref url="/pages/1Mes6f0JdsaElIzTbvKU" %}
[FAQ](/aranet4/aranet4-home/faq)
{% endcontent-ref %}
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column %}
{% content-ref url="/pages/o9vlNZ1IUPgZh1I5LiXp" %}
[Quick Start Guide](/aranet4/aranet4-home/quick-start-guide)
{% endcontent-ref %}
{% endcolumn %}

{% column %}

{% endcolumn %}
{% endcolumns %}


# General

This page explains the main features and functionality of the Aranet4 device, including its measurements, display indicators, and basic operating principles.


# About Aranet4

#### A CO<sub>2</sub> monitor that tells you when to air out your room!

Aranet4 Home measures CO<sub>2</sub>, temperature, humidity, and ambient pressure in real time. It shows when indoor air becomes stale and reminds you to ventilate for better focus, sleep, and health. The sensor is battery-powered, cable-free, and it connects to the Aranet Home app for trends and alerts.

The device is suitable for monitoring the CO₂ level at home, in school, office, or any other indoor environment.

Measurement data is displayed on a power-efficient e-ink screen with a long battery life. Additionally, the device provides visual and optional buzzer notifications when the CO₂ concentration becomes unhealthy.

{% hint style="info" %}
CO₂ concentration levels of 1400 ppm (parts per million) and up are unhealthy and can cause drowsiness and decrease cognitive function by 50%.
{% endhint %}

A high concentration of CO₂ is an indicator of insufficient ventilation, which can increase the risk of infection with airborne diseases.

#### Carbon Dioxide (CO₂)

The Aranet4 uses a Non-Dispersive Infrared (NDIR) sensor to measure carbon dioxide levels. Inside the device, an infrared light source shines through an air chamber toward a detector.

* CO₂ molecules absorb light at a specific infrared wavelength (\~4.26 μm). By measuring how much light is absorbed, the device calculates the CO₂ concentration.
* NDIR sensors are highly stable, selective, and the industry standard for accurate indoor air monitoring.

#### Temperature and Relative Humidity (T/RH)

Temperature and humidity are measured using a precision digital sensor that includes a tiny thermistor and a capacitive humidity element.

* The thermistor changes its electrical resistance with temperature, while the humidity element changes capacitance based on moisture in the air.
* The sensor converts these physical changes into digital readings, giving accurate T/RH measurements with minimal drift.

#### Atmospheric Pressure (hPa)

The Aranet4 includes a barometric pressure sensor to ensure accurate CO₂ measurements. Because NDIR CO₂ sensing depends on the number of gas molecules inside the optical chamber, changes in atmospheric pressure — caused by weather or altitude — would otherwise influence the reading.

{% hint style="info" %}
By monitoring pressure, the Aranet4 can automatically compensate for these variations, delivering consistent, precise CO₂ values regardless of environmental conditions.
{% endhint %}

#### Screen indications

Besides the measurements, the Aranet4 screen can show these indications:

| Indication              | Meaning                                                                                                                        |
| ----------------------- | ------------------------------------------------------------------------------------------------------------------------------ |
| Inverted screen         | The CO₂ level has reached the red threshold. Ventilate the room.                                                               |
| Calibration progress    | A CO₂ calibration is running. See [Calibration & Errors](/aranet4/aranet4-home/usage-and-measurements/calibration-and-errors). |
| Six-digit PIN code      | The device is ready to pair. Enter this code in the Aranet Home app.                                                           |
| Do not remove batteries | A firmware update is running. Do not remove the batteries until it is finished.                                                |
| Empty batteries         | The batteries are empty. Replace them.                                                                                         |


# Device Lifespan

Excluding the batteries, the NDIR sensor itself can last up to 15 years. The battery life of two AA batteries that the device uses is dependent on some conditions. See the table below:

#### Battery lifetime

| Measurement interval | Alkaline batteries, Bluetooth Off | Alkaline batteries, Bluetooth On | Lithium batteries, Bluetooth Off | Lithium batteries, Bluetooth On |
| -------------------- | --------------------------------- | -------------------------------- | -------------------------------- | ------------------------------- |
| 1 min                | 1.0 years                         | 0.9 years                        | 1.3 years                        | 1.1 years                       |
| 2 min                | 2.0 years                         | 1.6 years                        | 2.6 years                        | 2.0 years                       |
| 5 min                | 4.0 years                         | 2.8 years                        | 5.6 years                        | 3.8 years                       |
| 10 min               | 6.5 years                         | 3.8 years                        | 9.4 years                        | 5.3 years                       |

#### Waste of electronics

Waste batteries and electronic equipment must be taken to household hazardous waste collection points! You may search the internet for the closest collection point in the area where you are located.

{% hint style="danger" %}
Never put these items in household garbage or recycling bins!
{% endhint %}

{% hint style="danger" %}
Do not expose the batteries to fire! Do not dismantle them!
{% endhint %}

Waste batteries and electronic equipment can contain substances and materials that can harm the environment and living beings if treated as regular household waste.


# Power Options

The Aranet4 can run either on standard AA batteries or via a dedicated AC power adapter. Out of the box, it uses **two AA batteries**, which — thanks to its power-efficient e-ink display and smart power management — can last for a few years and potentially much longer if data updates are infrequent.&#x20;

{% columns %}
{% column %}

<div data-with-frame="true"><figure><img src="https://3323570029-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FsryVHhsQqwlIEVjGZzRx%2Fuploads%2FXSIrtfxCB5qDtkmyEJsc%2Fimage.png?alt=media&amp;token=1971331b-92f9-46cf-af03-b9e2fe41a152" alt="" width="375"><figcaption></figcaption></figure></div>
{% endcolumn %}

{% column valign="middle" %}
For installations where you prefer continuous monitoring without battery maintenance, an optional AC adapter can be used to keep the device powered indefinitely. The power adapter can be found here:

[Buy Aranet4 AC Power Adapter](https://aranet.com/en/pro/products/aranet4-ac-power-adapter)
{% endcolumn %}
{% endcolumns %}


# Manuals & Firmware

This page explains how to access product documentation, download firmware updates, and maintain the latest device software version.


# Documents

**Aranet4 user manual** can be downloaded from:

[**Aranet4 Home User Manual**](https://aranet.com/downloads/aranet4-home-user-manual)

**Datasheet:**

[**Aranet4 Home Datasheet**](https://aranet.com/downloads/aranet4-home-datasheet)

**Quick Start Guide:**

[**Aranet4 Home Quick Start Guide**](https://aranet.com/downloads/aranet4-home-quick-start-guide)


# Firmware Changelog

Aranet4 Home

{% updates format="full" %}
{% update date="2025-05-08" %}

## v2.0.7

* Initial custom threshold values now match default threshold values.
* PRO versions can now disable screen refresh and measurement display.
* Added platform support for the mioty protocol on PRO versions.
  {% endupdate %}

{% update date="2025-03-18" %}

## v1.5.44

* Improved display driver stability.
* Improved GUI: added sensor ID on screen.
  {% endupdate %}

{% update date="2024-08-26" %}

## v1.4.19

* Improved battery life
* Improved new battery detection in low battery state
  {% endupdate %}

{% update date="2023-11-28" %}

## v1.4.14

* Optimized memory management to obtain up to 30 days of on-device data history.
* Introduced CO₂ on-demand measurement for all sensor HW types.
* Fixed Bluetooth extended range functionality to support all sensor HW types.
  {% endupdate %}

{% update date="2023-06-06" %}

## v1.3.5

* Introduced CO₂ on-demand measurement support.
  {% endupdate %}

{% update date="2022-10-12" %}

## v1.2.0

* New Bluetooth service UUID.
* Measurement data included in Bluetooth advertising packet.
  {% endupdate %}

{% update date="2021-10-13" %}

## v0.4.10

* Reduced consumption of LoRa radio for PRO version HW.
* CO₂ sensor intermittent read failure fixed.
* Sensor ID shown on screen for PRO version HW.
  {% endupdate %}
  {% endupdates %}


# Updating Firmware

Starting with Aranet Home app version v2.0, a firmware update can be done as follows:

{% columns %}
{% column valign="middle" %}
Locate the sensor you need to perform the update on. Then click on the three-dot icon and find *Device Settings.*

Scroll down and find the *Firmware Update* option and press it.

In the next window, if there is an update, you will be able to perform one. If not, then a message *Up to date* will be displayed.
{% endcolumn %}

{% column %}

<div data-with-frame="true"><figure><img src="https://3323570029-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FsryVHhsQqwlIEVjGZzRx%2Fuploads%2FhAKzmMCb56oWGaO2DO1y%2FWhatsApp%20Video%202026-10-14%20at%2014.03.13.gif?alt=media&amp;token=2d4b0afc-76a8-4d4b-88d5-afef7c4fc697" alt="" width="135"><figcaption></figcaption></figure></div>
{% endcolumn %}
{% endcolumns %}

{% hint style="info" %}
Sometimes there might be an issue where the sensor is stuck during some operation, for example, a firmware upgrade.
{% endhint %}

If you are stuck in the update process, it is advised to open the Aranet Home app and try to add a new sensor. In most cases, this sensor will be discovered, paired back to the app, and working again. If the issue still persists, please contact <support@aranet.com> or refer to the information in another topic: [Firmware Update Issues](/aranet4/aranet4-home/manuals-and-firmware/firmware-update-issues)


# Firmware Update Issues

Sometimes the update might get "stuck" or not complete. Here is what you can do to troubleshoot the issue and find a solution.

{% hint style="warning" %}
This only works from the Aranet Home app v3.4.2. As such, you should update your app before trying this.
{% endhint %}

{% hint style="warning" %}
Removing the batteries erases the measurement history stored on the device. If the sensor is still connected, open the Aranet Home app and let it sync first, so the history is kept in the app.
{% endhint %}

{% columns %}
{% column valign="middle" %}

* Remove the batteries from the device and leave the sensor for 5+ minutes.
* Delete the sensor from both the Bluetooth device and app device lists.
* Re-add your sensor back in the Aranet Home app
* Retry the update process.
  {% endcolumn %}

{% column %}

<div data-with-frame="true"><figure><img src="https://3323570029-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FsryVHhsQqwlIEVjGZzRx%2Fuploads%2F7lp47BRaZW8CyMjHBmYE%2FWhatsApp%20Image%202026-10-01%20at%2012.02.38.jpeg?alt=media&amp;token=a1de71a0-0075-4c48-8b83-056cf8f1a5a9" alt="" width="188"><figcaption></figcaption></figure></div>
{% endcolumn %}
{% endcolumns %}

There is a possibility that the device is still waiting for the update to begin, but the phone is not sending anything to the sensor. In such cases, please restart your phone, then open the Aranet Home app and go back to the *Firmware Update* option. The update should continue from the point where it was stopped.


# Usage & Measurements

This page explains how Aranet4 performs measurements, including sensor behavior, data interpretation, and measurement intervals.


# Data Storage

### Data Storage table

The amount of historical measurement data stored is directly tied to the measurement interval set on the device:

<table><thead><tr><th>Measurement interval, minutes</th><th>Historic data availability, days</th><th data-hidden></th></tr></thead><tbody><tr><td>10</td><td>30</td><td></td></tr><tr><td>5</td><td>15</td><td></td></tr><tr><td>2</td><td>7</td><td></td></tr><tr><td>1</td><td>3.5</td><td></td></tr></tbody></table>

### Memory management

{% hint style="warning" %}
Altering the measurement interval triggers a restructuring of existing data in the memory system.
{% endhint %}

For instance, switching from a shorter interval (e.g., 1 minute) to a longer one (e.g., 10 minutes) aggregates ten 1-minute measurements to compute and store an average value. Conversely, adjusting from a longer interval (e.g., 10 minutes) to a shorter one (e.g., 1 minute) generates supplementary data in 1-minute intervals by extrapolating values from 10-minute measurements, creating a sequence of 10-minute "steps" with identical values.

Frequent changes in measurement intervals are discouraged due to the resulting data loss caused by averaging and padding.

If more frequent measurements are required, use the "on-demand measurement" feature for instant measurement.

### Background data download

The data can be downloaded in the background if the application runs as a background process and "Background data read" is enabled in the app settings.

{% columns %}
{% column width="58.333333333333336%" %}

<div data-with-frame="true"><figure><img src="https://3323570029-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FsryVHhsQqwlIEVjGZzRx%2Fuploads%2FgULIL0E8ljmPo6LeeXKz%2Fimage.png?alt=media&amp;token=b9eac3c1-94ac-40eb-b28c-c07b4e360240" alt=""><figcaption></figcaption></figure></div>

{% hint style="success" %}
We recommend turning this feature on.
{% endhint %}
{% endcolumn %}

{% column width="41.666666666666664%" %}
Background data read setting allows you to synchronize the sensor measurements with the app whenever you are within the discoverable sensor's range.

This is very useful, as without this feature the measurements are synchronized only after opening the app itself.
{% endcolumn %}
{% endcolumns %}

{% hint style="info" %}
This information pertains to firmware version v1.4.14 and later. Refer to the [changelog of the firmware](/aranet4/aranet4-home/manuals-and-firmware/firmware-changelog) for additional details.
{% endhint %}


# Default Settings

The Aranet4 is calibrated in the factory, and it works instantly when you take it out of the box and insert the batteries – no additional setup is needed. These are the default settings of the Aranet4 device:

* The default measurement interval is set to 5 minutes.
* CO₂ sensor automatic calibration is disabled.
* The default temperature measurement units are set to Celsius.
* Bluetooth connection is enabled.
* Bluetooth connection transmission range is set to normal.
* The buzzer for audio sound alarm notifications is disabled.
* CO₂ indication is set to human mode.
* Access to the Smart Home assistant is enabled.

The 2nd, 3rd, and 4th settings can be changed with the switches in the battery compartment on the back of the device for the Aranet4 screen, but the remaining five settings can only be changed via the Aranet Home phone application.

{% hint style="info" %}
To change a switch, open the battery compartment and move the switch up or down with the pin tool supplied with the device. You can do this with the batteries inside. If you change the switches with the batteries removed, the new settings start working once the batteries are back in.
{% endhint %}

{% hint style="warning" %}
Removing the batteries erases the measurement history stored on the device. Open the Aranet Home app and let it sync first, so the history is kept in the app.
{% endhint %}

More information about Aranet4 settings in the Aranet Home app: [Sensor Management](/aranet-home-app/aranet-home-app/sensor-management-tiles#aranet4)


# Calibration & Errors

## Calibration process

The Aranet4 can be calibrated either automatically or manually at home.

{% hint style="success" %}
Please redo the calibration for Aranet4 sensors once per year, as the sensor measurement values will start to drift over time.
{% endhint %}

Out of the box, brand-new sensors have the factory calibration, and for some time there is no need to do it; measurements will be precise just by putting in the batteries and pairing the sensor with the Aranet Home app.

In the case of automatic calibration mode, the Aranet4 device will use the lowest ppm data from approximately 8 hours of the lowest measurements during each 30-day operation period. If the lowest recorded measurement was 460 ppm, then this will be considered 420 ppm.

{% hint style="warning" %}
In automatic calibration, the deviation might vary.
{% endhint %}

### Prerequisites

When doing a **manual** calibration, the Aranet4 device must be:

* Exposed to fresh air (about 420 ppm of CO₂) and the environment should be stable (not changing) for 30 minutes while the calibration is done.
* Maintain a distance of at least 1 meter from the device during the calibration process so the CO₂ from your breath won’t impede the calibration.
* To initiate the manual CO₂ calibration, change the switch position at the back of the device behind the batteries from MANUAL to AUTO and back to MANUAL (maintain a maximum of 1 second between each movement):

{% columns %}
{% column width="41.66666666666667%" valign="middle" %}
{% hint style="info" %}
The batteries must be inserted into the device. To trigger the switch, use the SIM tool delivered with Aranet4 or another similar tool.
{% endhint %}
{% endcolumn %}

{% column width="58.33333333333333%" %}

<div data-with-frame="true"><figure><img src="https://forum.aranet.com/site/assets/files/1527/a4_calibration_switch.jpg" alt="" width="375"><figcaption></figcaption></figure></div>
{% endcolumn %}
{% endcolumns %}

The calibration progress will be displayed on the screen of the device. In case of a calibration failure message, make sure that the environmental requirements are met and repeat the process from the beginning.

Manual calibration can be done using the Aranet Home app as well. You can see the instructions on how to do the manual calibration via the app.

For reference background CO₂ level, please check the [global outdoor CO₂ level map](https://earth.nullschool.net/#current/chem/surface/level/overlay=co2sc/orthographic=29.16,51.27,791/loc=24.215,57.021):\
Click with the mouse pointer on your location on the map, and you will see the current CO₂ level outdoors.

## Calibration errors

{% hint style="warning" %}
Removing the batteries erases the measurement history stored on the device. Before you take out the batteries, open the Aranet Home app and let it sync, so the history is kept in the app.
{% endhint %}

### Unexpected error

Remove the batteries for 15 minutes and try the calibration again. If the calibration is still not possible and an error is still shown on the screen of the device, then please proceed with the [RMA](https://rma.aranet.com/) process.

### Calibration failed, unstable environment

{% columns %}
{% column valign="middle" %}
The error message "Calibration failed, unstable environment" means that during the calibration process of the Aranet4 device, the CO₂ concentration level changes in the surrounding air were too large for the device to correctly set the 420 ppm calibration baseline.
{% endcolumn %}

{% column %}

<div data-with-frame="true"><figure><img src="https://3323570029-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FsryVHhsQqwlIEVjGZzRx%2Fuploads%2FLngF7hkfcIAAVMDIFRvp%2Fimage.png?alt=media&amp;token=8820d00e-d8ed-4a4e-bb34-7d42bf5bc6f0" alt=""><figcaption></figcaption></figure></div>
{% endcolumn %}
{% endcolumns %}

To restore the device's operation of the device and obtain a successful and correct calibration result, please try:

1. Take out the batteries of the Aranet4 device.
2. Put the batteries in the correct orientation again inside the device (both batteries in the same direction with the + pole on the left side).
3. Restart the phone where the Aranet Home application is installed.
4. Try the calibration again. Remember that it is better to put the sensor, if possible, in an outdoor environment during the calibration process for 15 minutes without any person nearby.

If the calibration is still not possible and an error is still shown on the screen of the device, then please proceed with the [RMA](https://rma.aranet.com/) process.

### Other error messages

There are three kinds of error messages that can appear on the screen of the device:

| Error code              | Cause                                                                                                                                                                                                                                             | Solution                                                                                                                                                                                                                                             |
| ----------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| 0x8001 – 0x8005         | The CO₂ sensor is damaged                                                                                                                                                                                                                         | Fill out the [RMA form](https://rma.aranet.com/)                                                                                                                                                                                                     |
| 0x8106, 0x800E – 0xFFFE | <p>CO₂ sensor malfunction or CO₂ measurement is out of range, caused by:</p><p>- Excessive CO₂ concentration near the device</p><p>- Excessive moisture near the device</p><p>-Incorrect calibration of CO₂ sensor</p><p>- Damaged CO₂ sensor</p> | <p>1. Let the Aranet4 device dry completely</p><p>2. <a href="https://www.youtube.com/watch?v=CD8E6WzpvjM">Manually recalibrate</a> the CO₂ sensor</p><p>3. If the problem persists, fill out the <a href="https://rma.aranet.com/">RMA form</a></p> |
| 0ppm or 9999ppm         | The CO₂ sensor is misadjusted or damaged                                                                                                                                                                                                          | <p>1. Manually recalibrate the CO₂ sensor</p><p>2. If the problem persists, fill out the <a href="https://rma.aranet.com/">RMA form</a></p>                                                                                                          |


# Placing the Sensor

The Aranet4 can be placed anywhere in the room where you tend to spend a lot of time – on a surface or mounted on the wall, where it can be comfortably seen.

{% columns %}
{% column width="41.66666666666667%" valign="middle" %}
Since people and animals exhale CO₂, the readings can be momentarily higher if you breathe directly on the sensor, so holding the sensor in your hand can sometimes give a higher measurement. However, placing the sensor near a window or entrance door might give a slightly lower reading because of the airflow in these areas.
{% endcolumn %}

{% column width="58.33333333333333%" valign="middle" %}

<div data-with-frame="true"><figure><img src="https://3323570029-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FsryVHhsQqwlIEVjGZzRx%2Fuploads%2Fjo5YhrCbN4w1r1Crok4L%2FWhatsApp%20Image%202026-10-20%20at%2017.25.46.jpeg?alt=media&amp;token=d69500e1-0980-4a8f-80f0-7c24fa480f95" alt=""><figcaption></figcaption></figure></div>
{% endcolumn %}
{% endcolumns %}

{% hint style="success" %}
For better experience place the sensor at breathing height.
{% endhint %}

The Aranet4 should not be placed in direct sunlight or in areas with a risk of splashing the sensor with different liquids, or in high-humidity environments (higher than 85%), such as your bathroom. Place the sensor in a safe place where it cannot accidentally be dropped because it isn’t drop-proof.

{% hint style="warning" %}
When placing the sensor, make sure the openings on the sides of the device aren't covered.
{% endhint %}

## Mounting the sensor on the wall

Such mounting is normal and will not affect the device measurement precision, as air vents are located on the sidewalls of the device body.

There is even a custom-made [**Aranet4 anti-theft wall mount**](https://aranet.com/en/pro/products/wall_mount_bracket) from us as the manufacturer that can be used to secure the device in its installation place. It also works with an Aranet2

<div data-with-frame="true"><img src="https://forum.aranet.com/site/assets/files/1798/flow2.577x0-is.png" alt=""></div>


# Use in High Altitude Areas

The CO₂ sensor of the device is calibrated at standard atmospheric pressure.&#x20;

{% hint style="warning" %}
It is not intended to use the device higher than 4000 m (13 000 ft) above sea level.
{% endhint %}

If the device has to be used at high altitude, [manual calibration](/aranet4/aranet4-home/usage-and-measurements/calibration-and-errors) of the unit should be performed.


# Troubleshooting

Select the section that matches your issue and follow the checks in the order shown. If the issue persists, contact Aranet Technical Support with the information listed under Contacting support.


# Before you start

What to record and save before you start troubleshooting.

Please identify whether the issue affects the device, its display, the Bluetooth connection, or the readings shown in the Aranet Home app.

* [x] Record the Sensor ID and serial number.
* [x] Note when the issue started and any recent changes, such as battery replacement, settings changes, or software updates.
* [x] Take a photo of the display or save the exact error message.
* [x] Check the Aranet Home app and device firmware versions.
* [x] If possible, synchronize and export your measurement history before proceeding.

{% hint style="warning" %}
Removing the batteries erases measurement history stored on the device. Synchronize the device with the app first. Export any history you need before reinstalling the app; do not assume it will be restored automatically.
{% endhint %}


# Power & battery

Display doesn't change, batteries run out too quickly, liquid or physical damage.

## Device's display doesn't change

If your Aranet4 does not respond, check the power supply first. An image remaining on the E Ink display does not, by itself, confirm that the device is still taking measurements.

* [x] Check the orientation of both AA batteries against the markings in the battery compartment.
* [x] Try a fresh, matching pair of batteries.
* [x] Inspect the battery compartment and contacts for visible damage or corrosion.
* [x] Restart the device using the procedure [*Restarting the device and restoring the connection*](/aranet4/aranet4-home/troubleshooting/bluetooth-and-app#restarting-the-device-and-restoring-the-connection).
* [x] Check whether measurements and Bluetooth communication resume.

**If the issue persists:** Contact support. If you find liquid, corrosion, or physical damage, proceed to [*The device was exposed to liquid or physical damage*](#the-device-was-exposed-to-liquid-or-physical-damage).

## Batteries run out too quickly

Assess [battery life](/aranet4/aranet4-home/general/device-lifespan#battery-lifetime) together with the battery type, measurement interval, Bluetooth settings, and use of additional integrations.

* [x] Replace both batteries together with a fresh, matching pair.
* [x] Record the replacement date.
* [x] Review the measurement interval and Bluetooth usage.
* [x] Check the firmware version.
* [x] Monitor actual battery life without changing the settings during the observation period.

**If the issue persists:** Provide support with the battery type, device settings, and actual operating time.

## The device was exposed to liquid or physical damage

If the issue started after a fall, liquid exposure, or use outside the specified operating conditions, include this information in your support request.

* [x] Stop using the device.
* [x] Remove the batteries if it is safe to do so.
* [x] Take a photo of any visible damage.
* [x] Contact support for further instructions.

Do not disassemble the device or use direct heat to dry it. Do not attempt to compensate for damage by repeatedly recalibrating CO₂.


# Display & alerts

Blank, frozen or incomplete display; buzzer and colour warnings.

## The display is blank, frozen, or incomplete

A display issue may occur while the device continues taking measurements. Compare the display with the latest readings in the app to determine whether the issue affects the screen or the device’s operation.

* [x] Check whether new readings are available in the app.
* [x] Check whether **Disable screen** is enabled, if this option is available for your device version.
* [x] Check the batteries and configured measurement interval.
* [x] Check for an available firmware update.
* [x] Restart the device if necessary.

**If the issue persists:** Send support a picture showing any lines, missing digits, or unchanged content. Do not press on the display or disassemble the device.

## The buzzer or colour warnings don't work as expected

Buzzer behaviour depends on its configured mode and the CO₂ warning thresholds. Check the device’s audible warning separately from phone notifications.

* [x] Confirm that the buzzer is enabled.
* [x] Check whether **On, once** or **On, every time** is selected.
* [x] Review the warning thresholds and CO₂ indication mode.
* [x] Wait for the next measurement.
* [x] For phone notifications, separately check app permissions and background operation settings.

**If the issue persists:** If a reading meets the warning conditions but no sound occurs, send support a screenshot of the settings. Restore your usual thresholds after testing.


# Bluetooth & app

Device not found, pairing and PIN, lost connection, restarting the device.

## Aranet4 doesn't appear in the app

If the app cannot find your device, check Bluetooth availability and app permissions. Add the device through the Aranet Home app.

* [x] Confirm that you are using **Aranet Home**.
* [x] Move your phone closer to the device. Better if no other devices are near.
* [x] Enable Bluetooth on your phone and check the Bluetooth switch in the Aranet4 battery compartment.
* [x] Allow Bluetooth, Nearby devices, or other permissions required by your phone’s operating system.
* [x] Search for the device again.
* [x] If possible, test with another compatible phone.

Additional checks:

* [x] Download the nRF Connect mobile app from Google Play or the App Store.
* [x] Try to find your device; the name should look like: Aranet4B234C.
* [x] If the device remains undiscoverable, then download the RSL FOTA app.
* [x] RSL FOTA app can find devices in a "stuck" state.
* [x] If the device is discoverable, try to use another phone; if it's not, then please fill out the [RMA](https://rma.aranet.com/) form.

**If the issue persists:** If another phone finds the device, review the original phone’s permissions and connection settings. If neither phone finds it, proceed to [*Restarting the device and restoring the connection*](#restarting-the-device-and-restoring-the-connection).

{% hint style="info" %}
The absence of a Bluetooth icon on the display does not necessarily mean Bluetooth is disabled. Display indicators differ between device versions.
{% endhint %}

## Pairing fails, or the PIN is not accepted

Use this section if Aranet4 appears in the device list, but pairing does not finish, no PIN request appears, or the entered PIN is rejected.

* [x] Confirm that the selected device’s Sensor ID matches your Aranet4.
* [x] Start pairing in the Aranet Home app.
* [x] Enter the current six-digit code shown on the Aranet4 display.
* [x] Check for a pairing prompt in your phone’s system notifications.
* [x] If pairing fails, remove the previous pairing and add the device again.
* [x] Try another compatible phone if necessary.

**Expected result:** The device is added successfully, and its measurements and settings are accessible.

## Connection lost / app readings do not update

Use this section if the device previously worked but now shows outdated or unavailable readings in the app. Compare the latest measurement time with the configured measurement interval.

* [x] Move your phone closer to Aranet4.
* [x] Open the app in the foreground and allow synchronization to finish.
* [x] Check app permissions and the device’s battery level.
* [x] Temporarily stop other apps or integrations from actively connecting to the device.
* [x] Check whether the same issue occurs with another phone.

**If the issue persists:** If readings update at close range, review the distance and obstacles between devices. If the connection works but history does not download, proceed to [*Measurements contain gaps*](/aranet4/aranet4-home/troubleshooting/measurements-and-data#measurements-contain-gaps).

## Restarting the device and restoring the connection

Use this procedure after simpler checks for the relevant symptom have failed. Restarting the device and removing a Bluetooth pairing are separate actions.

{% stepper %}
{% step %}

#### Close the app and restart your phone

Close the app and restart your phone.
{% endstep %}

{% step %}

#### Restart Aranet4

Restart Aranet4, following the battery removal duration specified in the applicable official instructions.
{% endstep %}

{% step %}

#### Remove previous pairings if necessary

If necessary, remove the device from the app and your phone’s saved Bluetooth pairings.
{% endstep %}

{% step %}

#### Add the device again

Add the device again through Aranet Home.
{% endstep %}

{% step %}

#### Reinstall the app only if needed

Consider reinstalling the app only after simpler checks.
{% endstep %}

{% step %}

#### Use another mobile device

If your device can't establish the connection, please use another device that is able to connect to the sensor.
{% endstep %}
{% endstepper %}

**Expected result:** The device reconnects, and new readings are available. Check the result after each action before proceeding.

**Related guide:** [Aranet Home App Troubleshooting](/aranet-home-app/aranet-home-app/troubleshooting)


# Measurements & data

CO₂, temperature, humidity or pressure readings; gaps in history.

## CO₂ readings seem too high or too low

Check placement and measurement conditions before recalibrating. Nearby people, exhaled breath, local CO₂ sources, and differences in ventilation can produce real variations in readings.

* [x] Place the device where air can circulate freely, away from direct breath and local CO₂ sources.
* [x] After moving it, allow the environment and readings to stabilize.
* [x] If comparing devices, place them together and compare readings taken at the same time.
* [x] Review the calibration mode and previous calibration conditions.
* [x] If recalibration is needed, follow the official manual calibration instructions.

**If the issue persists:** Provide support with comparison data collected under stable conditions.

{% hint style="info" %}
Outdoor CO₂ is not always exactly 420 ppm. A single outdoor reading is insufficient to establish that a device is faulty.
{% endhint %}

## Different temperature, humidity, or pressure readings

Compare measurements under the same conditions and in the same units. Temperature differences also affect relative humidity comparisons. Moving or holding a device may temporarily influence its readings.

* [x] Place both devices together, away from sunlight, heat sources, and direct airflow.
* [x] Allow both devices to stabilize.
* [x] Check measurement units and timestamps.
* [x] For pressure comparisons, establish whether the reference reports local pressure or pressure adjusted to sea level.
* [x] Compare the difference against both devices' [specifications](/aranet4/aranet4-home/manuals-and-firmware/documents).

**If the issue persists:** Provide the reference device model, comparison duration, conditions, and recorded values.

{% hint style="info" %}
CO₂ calibration is not a procedure for correcting temperature or relative humidity readings.
{% endhint %}

## Measurements contain gaps

Available history depends on the measurement interval, firmware, and synchronization. Removing batteries or changing the measurement interval can affect data stored on the device.

* [x] Open the app near the device and allow synchronization to finish.
* [x] Check the date range selected in the graph.
* [x] Establish whether the batteries were removed or the measurement interval changed.
* [x] Check whether the requested period is still within the device’s storage capacity.
* [x] Export the available history.
* [x] Review background data reading settings.
* [x] If it is turned off, ensure that it is on.

**If the issue persists:** Record the exact dates and times of recurring gaps.

{% hint style="info" %}
Missing history does not necessarily indicate a sensor fault. Synchronization cannot restore history that has been erased or overwritten in device memory.
{% endhint %}

**Related guide:** [Data Storage](/aranet4/aranet4-home/usage-and-measurements/data-storage)


# Calibration & firmware

Calibration failed or not finished; firmware update failed or stuck.

## Calibration failed or not finished

The message **Calibration failed, unstable environment** indicates that CO₂ concentration changed too much during calibration. An unexpected error or a calibration process that does not finish requires separate checks.

* [x] Record the exact error message.
* [x] Choose a suitable fresh-air environment within the device’s specified operating conditions.
* [x] Allow the device to adjust to the environment.
* [x] Keep it stationary and avoid breathing near it during calibration.
* [x] Repeat calibration using the official instructions.
* [x] If calibration remains stuck, follow the applicable recovery procedure.

**Expected result:** Calibration finishes, and the device returns to normal measurement mode.

If calibration repeatedly fails under stable conditions, contact support. A new, factory-calibrated device does not normally require immediate recalibration.

**Related guide:** [Calibration & Errors](/aranet4/aranet4-home/usage-and-measurements/calibration-and-errors)

## Firmware update failed or stuck

Use this section if an update does not start, stops progressing, or returns an error. Distinguish between a failure to download the update and a failure to transfer it to the device.

* [x] Update the Aranet Home app.
* [x] Check your phone’s internet connection and the device’s batteries.
* [x] Keep your phone close to Aranet4.
* [x] Confirm that calibration is not in progress.
* [x] Retry according to the official firmware update instructions.
* [x] If the device remains in update mode, follow the dedicated firmware recovery instructions.

**Expected result:** The installed firmware version is visible in the app, and new measurements are available.

{% hint style="info" %}
If the firmware update failed, please try again after some time.
{% endhint %}

**Related guides:**

* [Updating Firmware](/aranet4/aranet4-home/manuals-and-firmware/updating-firmware)
* [Firmware Update Issues](/aranet4/aranet4-home/manuals-and-firmware/firmware-update-issues)


# Contacting support

What to prepare and how to contact Aranet Technical Support.

If an error code appears or the issue persists, record the exact message and the circumstances in which it occurs.

## Information to include

* Sensor ID and serial number.
* Device firmware and Aranet Home app versions.
* Phone model and operating system version.
* A photo or screenshot of the error.
* When the issue started and how it can be reproduced.
* Checks already performed and their results.
* Measurement exports or reference comparisons, where relevant.

Contact **<support@aranet.com>**. If a return is required, use the [RMA form](https://rma.aranet.com/).


# Device Care


# Handling and Cleaning

The Aranet devices are advanced electronic devices in a plastic case.&#x20;

{% hint style="info" %}
You should handle and clean them the same way you deal with other household electronic devices.
{% endhint %}

#### Handling

* Aranet devices are not impact-resistant; do not drop or hit them.
* Aranet devices are not waterproof; do not use them in high humidity environments (greater than 85%).
* The Aranet4 protection class is IP20: it is protected against solid objects larger than 12.5 mm, but not against water.
* Do not leave Aranet devices in direct sunlight. This can damage the E-ink screen
* Do not expose Aranet devices to strong electromagnetic fields.
* Aranet devices are intended for use at temperatures 0 °C to 50 °C (32 °F to 122 °F). Exposure to lower temperatures can damage the device.

#### Cleaning

You can clean your Aranet device with lukewarm water and mild soap. Mix some soap and water in a bucket, and clean the case using a slightly wet soft sponge or microfiber cloth to avoid scratching the material and water drops entering the case. Make sure your detergent has no harsh chemicals that could damage the plastic and sensor, such as white spirits or Clorox.

#### Disinfecting

Alcohol solutions (alcohol / purified water) or wipes with at least 70 % alcohol are effective for the sanitization of the Aranet case. First, clean the surface with soap and water as described above. Apply the alcohol solution and let it sit on the surface for at least 30 seconds to disinfect. Wipe dry with a clean cloth.

You can use low-power household UV disinfectors for Aranet4 disinfection, too. Follow the UV-disinfector instructions and do not overexpose Aranet4 to UV radiation.


# FAQ

This page explains common questions and answers related to Aranet4 functionality, configuration, and troubleshooting.

<details>

<summary>How and when to calibrate Aranet4 Home?</summary>

Aranet4 is calibrated at the factory, so if you’ve just received your new device, there is no need to calibrate it immediately. We recommend calibrating Aranet4 once a year.

Aranet4 can be calibrated either automatically or manually at home. In automatic calibration mode, the Aranet4 device needs to be exposed to fresh air with approximately 420 ppm of CO<sub>2</sub> (for example, outdoors or in a room with very good air exchange) for about 8 hours during each 30-day operation period.

For manual calibration, the Aranet4 device must be exposed to fresh air (around 420 ppm of CO<sub>2)</sub>, such as in a forest. The environment should be stable (unchanging) for 30 minutes during the calibration. Maintain a distance of at least 1 meter from the device during the calibration process to ensure the CO<sub>2</sub> from your breath doesn’t affect the calibration. To initiate manual CO<sub>2</sub> calibration, change the 1st switch position at the back of the device, behind the batteries, from MANUAL to AUTO and back to MANUAL, keeping a maximum of 1 second between each movement. The batteries must be installed in the device. The calibration progress will be displayed on the device’s screen.

For a reference background CO<sub>2</sub> level, please check a global outdoor CO<sub>2</sub> level map. Manual calibration can also be performed using the Aranet Home app. Instructions for manual calibration via the app are available in the Aranet4 Calibration Tutorial.

Tutorials: [Calibration & Errors](/aranet4/aranet4-home/usage-and-measurements/calibration-and-errors#calibration-process) or [Calibration Process](/aranet-home-app/aranet-home-app/sensor-management-tiles#calibration-process) (in-app).<br>

</details>

<details>

<summary>What is the NDIR sensor and why is it preferred over other types of sensors?</summary>

Aranet4 uses a non-dispersive infrared (NDIR) sensor to measure CO<sub>2</sub> levels. The device features a small gas chamber with an infrared light source, where CO<sub>2</sub> absorbs the light. An optical filter in front of the detector then filters out all light except the wavelength absorbable by CO<sub>2</sub> molecules, enabling a precise CO<sub>2</sub> concentration level measurement. This CO<sub>2</sub> reading method offers higher precision than regular electro-chemical sensors, as it uniquely detects carbon dioxide with no interference from other gases. Furthermore, the NDIR sensor has a much longer lifespan and requires less recalibration than other sensors.

<img src="https://assets.aranet.com/images/NDIR_sensor.max-800x600.width-800.webp" alt="" data-size="original">

</details>

<details>

<summary>Why do I need to monitor CO₂ concentration?</summary>

High CO<sub>2</sub> levels can negatively affect your well-being, comfort, and productivity. For example, if CO<sub>2</sub> levels reach 1000 ppm, your cognitive abilities drop by 15%. At 1400 ppm and above, they decrease by a staggering 50%. Additionally, CO<sub>2</sub> monitoring helps to prevent the spread of COVID-19, as CO<sub>2</sub> level is a good proxy for airborne infection risk.<br>

</details>

<details>

<summary>How to set a buzzer on Aranet4 Home?</summary>

To set up a buzzer, follow these steps:

1\) Open your Aranet Home app;

2\) Click on the “Gear” icon in the top right corner;

3\) Select 'Buzzer' and choose 'On, once' or 'On, every time' depending on your preference.

The setting is explained here:[ Buzzer settings](/aranet-home-app/aranet-home-app/sensor-management-tiles#settings)

</details>

<details>

<summary>How do I change the threshold at which Aranet4 buzzes?</summary>

If switched on, the buzzer emits a sound when the CO<sub>2</sub> concentration reaches the red threshold, which is set by default to 1400 ppm. To change it, follow these steps:

1\) Open your Aranet Home app;

2\) Click on the 'Gear' icon in the top right corner of the sensor's tile;

3\) Select 'Warning thresholds' under 'Advanced';

4\) Choose 'Custom' and change the thresholds as desired.

<br>

</details>

<details>

<summary>Does it work without cables or Wi-Fi?</summary>

Yes. It’s battery-powered and cable-free. Bluetooth is optional and used only if you connect it to the Aranet Home app.

</details>

<details>

<summary>What are the recommendations for indoor air humidity?</summary>

Indoor humidity levels should range from 30% to 50%. This range supports comfort and health, while also helping to prevent mold growth.

</details>

<details>

<summary>How can I extend the warranty on my Aranet Home products?</summary>

You can extend the warranty of your Aranet Home products by an additional 12 months by registering the product and agreeing to receive email updates from SAF Tehnika. You can withdraw your consent to receive emails anytime without affecting the extended warranty.

[Register your product](https://aranet.com/en/home/register-product)<br>

</details>

<details>

<summary>How can I return my Aranet sensor?</summary>

If you’re facing issues with your product, please fill in the returns form.

[Return form](https://rma.aranet.com/)

</details>

<details>

<summary>How do I turn the display off?</summary>

To turn the display off, your Aranet4 device has to be paired with the Aranet Home app. Then you should head to the Settings tab by pressing the settings icon, where you will see the "Disable screen" option switch. The screen will be disabled as soon as the option is turned on.

Explained here: [Disable screen](/aranet-home-app/aranet-home-app/sensor-management-tiles#advanced)

</details>


# Aranet Radon Plus

The **Aranet Radon Plus** is a battery-powered radon sensor designed for continuous indoor air quality monitoring. It provides real-time measurements of radon gas concentration, temperature, relative humidity, and atmospheric pressure, shows them on a low-power E-Ink display, and shares data with the Aranet Home mobile app via Bluetooth. This section provides product information, placement recommendations, configuration guidance, and maintenance information to support accurate and reliable radon monitoring.

{% columns %}
{% column %}
{% content-ref url="/pages/oUwHE1PI0UX7ZA0KFGU3" %}
[General](/aranet-rn+/aranet-radon-plus/general)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
{% content-ref url="/pages/sMV2l4WvkyEFp9xU1U5l" %}
[Manuals & Firmware](/aranet-rn+/aranet-radon-plus/manuals-and-firmware)
{% endcontent-ref %}
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column %}
{% content-ref url="/pages/uptClzlnsnXrzPzMqd9V" %}
[Usage and Measurements](/aranet-rn+/aranet-radon-plus/usage-and-measurements)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
{% content-ref url="/pages/98f4a4c2a3ddf1e606c65b7b9eb219bab6df1a9c" %}
[Troubleshooting](/aranet-rn+/aranet-radon-plus/troubleshooting)
{% endcontent-ref %}
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column %}
{% content-ref url="/pages/REXbOqsVWFpn4zuEGm4Z" %}
[Device Care](/aranet-rn+/aranet-radon-plus/device-care)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
{% content-ref url="/pages/yG8n9yxDLUCqR75YRpND" %}
[FAQ](/aranet-rn+/aranet-radon-plus/faq)
{% endcontent-ref %}
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column %}
{% content-ref url="/pages/KOfgm9WneX4mfpn2BB2B" %}
[Quick Start Guide](/aranet-rn+/aranet-radon-plus/quick-start-guide)
{% endcontent-ref %}
{% endcolumn %}

{% column %}

{% endcolumn %}
{% endcolumns %}


# General

This page explains the main features and functionality of the Aranet Radon Plus device, including its measurements, display indicators, and basic operating principles.


# About Aranet Rn+

Provides real-time measurements of radon gas concentration, temperature, and relative humidity. With its portability and extended multi-year battery life, this device ensures convenience and reliability in continuous indoor air quality monitoring.

#### What does Aranet Radon Plus measure?

#### Radon Gas

Radon gas is tasteless, odourless, and hard to detect, posing serious health risks. It escapes from the ground into the air and can accumulate in your home. According to the [World Health Organisation](https://www.who.int/news-room/fact-sheets/detail/radon-and-health), radon is one of the leading causes of lung cancer. Since its levels can fluctuate, regular radon monitoring is vital. Aranet Radon Plus sensor offers real-time radon monitoring. With wireless functionality and quality components, it ensures accurate measurements. The E-Ink display and long battery life make it ideal for continuous indoor air quality monitoring.

#### Temperature and Relative Humidity (T/RH)

Temperature and humidity are measured using a precision digital sensor that includes a tiny thermistor and a capacitive humidity element.&#x20;

* The thermistor changes its electrical resistance with temperature, while the humidity element changes capacitance based on moisture in the air.&#x20;
* The sensor converts these physical changes into digital readings, giving accurate T/RH measurements with minimal drift.

#### Atmospheric Pressure (hPa)

The Aranet Radon Plus includes a barometric pressure sensor, allowing you to correlate environmental conditions with radon levels and understand how ventilation or seasonal changes affect indoor radon concentrations.

#### Screen indications

Besides the measurements, the Aranet Radon Plus screen can show different indications:

| Indication                      | Meaning                                                                            |
| ------------------------------- | ---------------------------------------------------------------------------------- |
| Current measurement: 10 minutes | The current radon measurement                                                      |
| 24h average - measuring         | Currently measuring the 24-hour average. Approximate 24-hour reading shown.        |
| 7d average - measuring          | Currently measuring the 7-day average. Approximate 7-day reading shown.            |
| 30d average - measuring         | Currently measuring the 30-day average. Approximate 30-day reading shown.          |
| High humidity detected          | Please place your sensor to a dry place and wait until it dries out.               |
| Switch screen                   | The batteries have drained. Please replace the existing batteries with fresh ones. |
| Inverted screen                 | The radon level has reached the red threshold.                                     |


# Device Lifespan

The battery life of two AA batteries that the device uses is dependent on some conditions. See the table below:

| Alkaline batteries, Bluetooth Off | Alkaline batteries, Bluetooth On | Lithium batteries, Bluetooth Off | Lithium batteries, Bluetooth On |
| --------------------------------- | -------------------------------- | -------------------------------- | ------------------------------- |
| 5.1 years                         | 3.3 years                        | 7.1 years                        | 4.5 years                       |

#### Waste of electronics

Waste batteries and electronic equipment must be taken to household hazardous waste collection points! You may search the internet for the closest collection point in the area where you are located.

{% hint style="danger" %}
Never put these items in household garbage or recycling bins!
{% endhint %}

{% hint style="danger" %}
Do not expose the batteries to fire! Do not dismantle them!
{% endhint %}

Waste of batteries and electronic equipment can contain substances and materials that can harm the environment and living beings if treated as regular household waste.


# Power Options

The Aranet Radon+ sensor runs on standard AA batteries. Out-of-the-box, it uses **two AA batteries**, which — thanks to its power-efficient e-ink display and smart power management — can last for a few years and potentially much longer if data updates are infrequent.


# Manuals & Firmware

This page explains how to access product documentation, download firmware updates, and maintain the latest device software version.


# Documents

**The Quick Start Guide**:

[Aranet Radon Plus Quick Start Guide](https://aranet.com/downloads/aranet-radon-plus-home-quick-start-guide)

**Datasheet:**

[Aranet Radon Plus Home Datasheet](https://aranet.com/downloads/aranet-radon-plus-home-datasheet)

**Leaflet:**

[Aranet Radon Plus Leaflet](https://aranet.com/downloads/aranet-radon-plus-leaflet)


# Firmware Changelog

Aranet Radon Plus

{% updates format="full" %}
{% update date="2026-03-25" %}

## v1.15.15

* Improved radon concentration calculation algorithm on both Home and Pro devices.
* For Pro (only) devices:
  * The new [Sensor Lock feature](/aranet-rn+/aranet-radon-plus/usage-and-measurements/sensor-lock-feature) is released.
    {% endupdate %}

{% update date="2025-08-14" %}

## v1.11.3

* Improved low battery detection.
* Improved radon concentration calculation algorithm.
  {% endupdate %}

{% update date="2025-01-08" %}

## v1.9.1

* Increased maximum displayable radon concentration to 7900 Bq/m<sup>3</sup> (214 pCi/L).
* Improved radon concentration calculation algorithm. GUI:
* Improved menu structure.
* Added sensor ID on pairing screen.
* Improved icons.
  {% endupdate %}

{% update date="2024-10-15" %}

## v1.8.0

* Added "measurement over measurable range" indication.
* Sharper display image after fast transitions. Stability enhancements:
* Improved display driver stability.
* Data processing improvements.
  {% endupdate %}

{% update date="2024-09-18" %}

## v1.7.2

* Improved battery life.
* Improved high-humidity environment detection.
* Fixed average values storage.
  {% endupdate %}

{% update date="2024-08-26" %}

## v1.7.0

* Improved battery life.
* Fixed the average values storage bug.
* Improved high-humidity environment detection.
  {% endupdate %}

{% update date="2024-07-08" %}

## v1.5.14

* Improved battery life.
* Improved concentration averaging algorithm.
* GUI improvements.
  {% endupdate %}

{% update date="2024-07-02" %}

## v1.5.11

* Initial firmware
  {% endupdate %}
  {% endupdates %}


# Updating Firmware

Starting with Aranet Home app version v2.0, a firmware update can be done as follows:

{% columns %}
{% column valign="middle" %}
Locate the sensor you need to perform the update on. Then click on the three-dot icon and find *Device Settings.*

Scroll down and find the *Firmware Update* option and press it.

In the next window, if there is an update, you will be able to perform one. If not, then a message *Up to date* will be displayed.
{% endcolumn %}

{% column %}

<div data-with-frame="true"><figure><img src="https://1201590045-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEmn83sm3fwM9elVam8x2%2Fuploads%2FK0iWLlRwhpDriZEOuzQt%2Ffirmware-update.gif?alt=media" alt="" width="135"><figcaption></figcaption></figure></div>
{% endcolumn %}
{% endcolumns %}

{% hint style="info" %}
Sometimes there might be an issue where the sensor is stuck during some operation, for example, a firmware upgrade.
{% endhint %}

If you are stuck in the update process, it is advised to open the Aranet Home app and try to add a new sensor. In most cases, this sensor will be discovered, paired back to the app, and working again. If the issue still persists, please contact <support@aranet.com> or refer to the information in another topic: [Firmware Update Issues](/aranet-rn+/aranet-radon-plus/manuals-and-firmware/stuck-in-firmware-upgrade-mode)


# Firmware Update Issues

Sometimes the update might get "stuck" or not complete. Here is what you can do to troubleshoot the issue and find a solution.

{% hint style="warning" %}
This only works from the Aranet Home app v3.4.2. As such, you should update your app before trying this.
{% endhint %}

{% hint style="warning" %}
Removing the batteries erases the measurement history stored on the device. If the sensor is still connected, open the Aranet Home app and let it sync first, so the history is kept in the app.
{% endhint %}

{% columns %}
{% column valign="middle" %}

* Remove the batteries from the device and leave the sensor for 5+ minutes.
* Delete the sensor from both the Bluetooth device and app device lists.
* Re-add your sensor back in the Aranet Home app
* Retry the update process.
  {% endcolumn %}

{% column %}

<div data-with-frame="true"><figure><img src="https://1201590045-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEmn83sm3fwM9elVam8x2%2Fuploads%2FAjfg7epNwsNRxnZZLpa9%2FWhatsApp%20Image%202026-10-01%20at%2012.02.38.jpeg?alt=media&amp;token=66317c6d-0907-40a9-bc05-029f4fe1d33b" alt="" width="188"><figcaption></figcaption></figure></div>
{% endcolumn %}
{% endcolumns %}

There is a possibility that the device is still waiting for the update to begin, but the phone is not sending anything to the sensor. In such cases, please restart your phone, then open the Aranet Home app and go back to the *Firmware Update* option. The update should continue from the point where it was stopped.


# Usage and Measurements

This page explains how Aranet Radon Plus performs measurements, including sensor behavior, data interpretation, and measurement intervals.


# Measurement Units

{% columns %}
{% column valign="middle" %}
The Aranet device units can be changed in the Aranet Home App settings or in the settings menu on the device itself. The settings here are only used for the displayed units in the app.&#x20;

For the Radon sensors, you can either change the units from the device settings in the app or using the buttons or the wheel on the side of the sensor.
{% endcolumn %}

{% column %}

<div data-with-frame="true"><figure><img src="https://1201590045-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEmn83sm3fwM9elVam8x2%2Fuploads%2FGwgDUOcT2gIJWJuoeoIL%2FWhatsApp%20Image%202026-10-23%20at%2010.16.27.jpeg?alt=media&amp;token=bfb22412-1c1c-4932-a4e8-76caed959dc0" alt="" width="188"><figcaption></figcaption></figure></div>
{% endcolumn %}
{% endcolumns %}

To enter the settings, press the switch inwards. To navigate the menu, push the switch up or down. Press the switch inwards again to choose an item.

{% columns %}
{% column width="41.67%" valign="middle" %}

<figure><picture><source srcset="/files/bC6URps2E89Gwn8NJi7z" media="(prefers-color-scheme: dark)"><img src="https://1201590045-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEmn83sm3fwM9elVam8x2%2Fuploads%2FrEPkIFqEPp3QPF4Jl99k%2Fradon-plus-settings-menu-usa-c.png?alt=media" alt="Settings menu screen" width="100%"></picture><figcaption></figcaption></figure>
{% endcolumn %}

{% column width="58.33%" valign="middle" %}
In the settings, you can:

1. Reset the measurements
2. Change the buzzer status
3. Switch the Bluetooth signal on or off
4. Change the units for radon levels
5. Change the units for temperature
   {% endcolumn %}
   {% endcolumns %}

The Aranet Radon Plus is calibrated in the factory, and it works instantly when you take it out of the box and insert the batteries – no additional setup is needed.


# Data Storage

Radon Plus Sensor is compatible with smart devices conforming to the Bluetooth specification 4.1 and up.
\
Bluetooth is utilized to enable the functionality of the Aranet Home mobile application. When transferring data to
&#x20;Aranet Home, **device memory provides 30 days of historical data availability**.

### Background data download

The data can be downloaded in the background if the application runs as a background process and "Background data read" is enabled in the app settings.

{% columns %}
{% column width="58.333333333333336%" %}

<div data-with-frame="true"><figure><img src="https://1201590045-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEmn83sm3fwM9elVam8x2%2Fuploads%2FCl6jMS9q5APVvhN1zAOG%2Fimage.png?alt=media&amp;token=a459dfd3-caf7-4c7e-ad58-e17dcc666750" alt=""><figcaption></figcaption></figure></div>

{% hint style="success" %}
We recommend turning this feature on.
{% endhint %}
{% endcolumn %}

{% column width="41.666666666666664%" %}
Background data read setting allows you to synchronize the sensor measurements with the app whenever you are within the discoverable sensor's range.

This is very useful, as without this feature the measurements are synchronized only after opening the app itself.
{% endcolumn %}
{% endcolumns %}


# Default settings

When you first connect to the Aranet Home app, you can change the display units.

These are the default settings of the Aranet Radon Plus device:

{% columns %}
{% column valign="middle" %}

* The default measurement interval is 10 minutes.
* The default radon measurement unit is set to Bq/m<sup>3</sup>.
* The default temperature measurement unit is set to Celsius.
* Bluetooth connection is enabled.
* Bluetooth connection transmission range is set to normal.
* The buzzer for audio sound alarm notifications is disabled.
* Access to the Smart Home assistant is enabled.
  {% endcolumn %}

{% column valign="middle" %}

<div data-with-frame="true"><figure><img src="https://1201590045-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEmn83sm3fwM9elVam8x2%2Fuploads%2F6qKr3ggdsJLXlhENATAb%2FWhatsApp%20Image%202026-10-23%20at%2009.57.10.jpeg?alt=media&amp;token=5e5f4ce7-65a1-46b2-8a57-6ce087626004" alt="" width="188"><figcaption></figcaption></figure></div>
{% endcolumn %}
{% endcolumns %}

#### Examples with measurements in °F and pCi/L

{% columns %}
{% column %}

<figure><img src="https://1201590045-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEmn83sm3fwM9elVam8x2%2Fuploads%2FaF7l1Qt1PDHj0B9OVNcu%2Fradon-plus-average-10min-usa-a.png?alt=media" alt="10 minutes averaging period, °F and pCi/L" width="100%"><figcaption><p>10 minutes</p></figcaption></figure>
{% endcolumn %}

{% column %}

<figure><img src="https://1201590045-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEmn83sm3fwM9elVam8x2%2Fuploads%2FN2lQjSSIg0xuqmktBJ7R%2Fradon-plus-average-24h-usa-a.png?alt=media" alt="24 hours averaging period, °F and pCi/L" width="100%"><figcaption><p>24 hours</p></figcaption></figure>
{% endcolumn %}

{% column %}

<figure><img src="https://1201590045-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEmn83sm3fwM9elVam8x2%2Fuploads%2FgfY6ckM9rXNSF0tUidSE%2Fradon-plus-average-7d-usa-a.png?alt=media" alt="7 days averaging period, °F and pCi/L" width="100%"><figcaption><p>7 days</p></figcaption></figure>
{% endcolumn %}

{% column %}

<figure><img src="https://1201590045-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEmn83sm3fwM9elVam8x2%2Fuploads%2FaxBXkTF83HNBT12FsL5i%2Fradon-plus-average-30d-usa-a.png?alt=media" alt="30 days averaging period, °F and pCi/L" width="100%"><figcaption><p>30 days</p></figcaption></figure>
{% endcolumn %}
{% endcolumns %}

#### Examples with measurements in °C and Bq/m³

{% columns %}
{% column %}

<figure><img src="https://1201590045-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEmn83sm3fwM9elVam8x2%2Fuploads%2FjOUOFN3AJFCDA3PsimFX%2Fradon-plus-average-10min-world-a.png?alt=media" alt="10 minutes averaging period, °C and Bq/m³" width="100%"><figcaption><p>10 minutes</p></figcaption></figure>
{% endcolumn %}

{% column %}

<figure><img src="https://1201590045-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEmn83sm3fwM9elVam8x2%2Fuploads%2Fdk7XpwTb4qiL5E06UhoR%2Fradon-plus-average-24h-world-a.png?alt=media" alt="24 hours averaging period, °C and Bq/m³" width="100%"><figcaption><p>24 hours</p></figcaption></figure>
{% endcolumn %}

{% column %}

<figure><img src="https://1201590045-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEmn83sm3fwM9elVam8x2%2Fuploads%2Fu4OYhaALOtXdWm0bPTHf%2Fradon-plus-average-7d-world-a.png?alt=media" alt="7 days averaging period, °C and Bq/m³" width="100%"><figcaption><p>7 days</p></figcaption></figure>
{% endcolumn %}

{% column %}

<figure><img src="https://1201590045-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEmn83sm3fwM9elVam8x2%2Fuploads%2FCJ7XDxhbsmA92Ih8LIKL%2Fradon-plus-average-30d-world-a.png?alt=media" alt="30 days averaging period, °C and Bq/m³" width="100%"><figcaption><p>30 days</p></figcaption></figure>
{% endcolumn %}
{% endcolumns %}

To enter the settings, press the switch inwards. To navigate the menu, push the switch up or down. Press the switch inwards again to choose an item.

{% columns %}
{% column width="41.67%" valign="middle" %}

<figure><picture><source srcset="/files/bC6URps2E89Gwn8NJi7z" media="(prefers-color-scheme: dark)"><img src="https://1201590045-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEmn83sm3fwM9elVam8x2%2Fuploads%2FrEPkIFqEPp3QPF4Jl99k%2Fradon-plus-settings-menu-usa-c.png?alt=media" alt="Settings menu screen" width="100%"></picture><figcaption></figcaption></figure>
{% endcolumn %}

{% column width="58.33%" valign="middle" %}
In the settings, you can:

1. Reset the measurements
2. Change the buzzer status
3. Switch the Bluetooth signal on or off
4. Change the units for radon levels
5. Change the units for temperature
   {% endcolumn %}
   {% endcolumns %}

The Aranet Radon Plus is calibrated in the factory, and it works instantly when you take it out of the box and insert the batteries – no additional setup is needed.

More information about Aranet Radon Plus settings in the Aranet Home app: [Sensor Management](/aranet-home-app/aranet-home-app/sensor-management-tiles#aranet-radon-plus)


# Placing the Sensor

For accurate readings, the **Aranet Radon Plus sensor** should be placed where radon is most likely to accumulate and where people actually spend time.

{% columns %}
{% column width="50%" valign="middle" %}
In homes, this is typically the **lowest regularly occupied level** (such as a basement or ground floor). Position the device **0.5–2 meters (1.6–6.5 ft)** above the floor, in an open area with normal air circulation. Avoid placing it near windows, doors, ventilation outlets, or exterior walls, as drafts and fresh air can dilute radon levels and distort measurements
{% endcolumn %}

{% column width="50%" valign="middle" %}

<div data-with-frame="true"><figure><img src="https://1201590045-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEmn83sm3fwM9elVam8x2%2Fuploads%2FWxbffPuwvfgdWCKFQaNg%2FWhatsApp%20Image%202026-10-23%20at%2009.56.34.jpeg?alt=media&amp;token=aba3a400-1bd9-45f0-adf9-2f6237f283e9" alt="" width="188"><figcaption></figcaption></figure></div>
{% endcolumn %}
{% endcolumns %}

{% hint style="danger" %}
Do not place the sensor in kitchens, bathrooms, or directly next to heat sources or electronic devices.
{% endhint %}

{% hint style="success" %}
A stable, central location away from direct sunlight will provide the most representative long-term radon measurements.
{% endhint %}

Do not place the Aranet Radon Plus sensor in areas where it could be splashed with liquids or in high-humidity environments (above 85%), such as your bathroom. Place the sensor in a safe place where it cannot accidentally be dropped because it isn’t drop-proof.


# Sensor Lock Feature

{% hint style="danger" %}
The Sensor Lock feature is available only for the **Aranet Radon Plus Pro** sensor.
{% endhint %}

This feature is designed for professionals performing measurements in locations such as private homes, where it is important that the device is not tampered with. It can also be useful in public environments, such as schools.

{% hint style="info" %}
To use this feature, make sure the sensor firmware is updated to **version 1.15.15 or later**.
{% endhint %}

#### Functionality

When the sensor is locked:

{% columns %}
{% column valign="middle" %}

* The screen will not show measurement data and will display the **Aranet logo** instead (similar to the screen disable feature on Aranet4 Pro).
  {% endcolumn %}

{% column %}

<div data-with-frame="true"><figure><img src="https://1201590045-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEmn83sm3fwM9elVam8x2%2Fuploads%2Fw2u1VXBNEvFwJHrSWwqP%2Frnv1.15.15%201.png?alt=media&amp;token=18c68177-aa59-4053-bfc7-ad5e7a44cb7d" alt="" width="191"><figcaption></figcaption></figure></div>
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column valign="middle" %}

* If the sensor button is pressed, a message will appear indicating that the device is locked and cannot be used.
  {% endcolumn %}

{% column %}

<div data-with-frame="true"><figure><img src="https://1201590045-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEmn83sm3fwM9elVam8x2%2Fuploads%2F468P5gphMWQgV9IhZEfV%2Frnv1.15.15%202.png?alt=media&amp;token=f8022f8f-9b40-45b8-9611-b3a0675eebf4" alt="" width="209"><figcaption></figcaption></figure></div>
{% endcolumn %}
{% endcolumns %}

* New Bluetooth pairings are not allowed. Previously paired devices will remain connected.
* The Aranet Radio connection to the base station remains unchanged.
* The sound alarm is disabled.
* The device will remain locked even if the battery compartment is opened and closed.

#### Locking the sensor after FW is upgraded

{% columns %}
{% column width="50%" valign="middle" %}
Open the Aranet Home app and go to the device settings. Check if the latest firmware version is installed. If not, update it.

After updating, the Lock device option will become available. Press **Lock device** to activate the feature.
{% endcolumn %}

{% column width="50%" %}

<div data-with-frame="true"><figure><img src="https://1201590045-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEmn83sm3fwM9elVam8x2%2Fuploads%2FySltT5ogqQrEUIj6lLk5%2Frnv1.15.15%203.png?alt=media&amp;token=216367f7-a0e6-493c-86d4-6f86fee2e74d" alt="" width="263"><figcaption></figcaption></figure></div>
{% endcolumn %}
{% endcolumns %}

#### Unlocking the sensor

To unlock the sensor, use the Aranet Home app. Open the app and go to the device settings.

Find the Lock device option and press it. As soon as the switch is light grey, the device is unlocked.

After unlocking, the sensor will return to normal operation, and measurements will be visible again.

{% hint style="info" %}
If you are not able to unlock the device, please contact <support@aranet.com>
{% endhint %}


# Troubleshooting

This guide helps you investigate common Aranet Radon Plus issues, including missing readings, unexpected radon values, Bluetooth connection problems, humidity warnings, and firmware update failures.


# Before you start

What to record and save before you start troubleshooting.

Select the section that matches your issue and follow the checks in order. After each action, check whether normal operation has resumed. If the issue persists, prepare the information listed on the [Contacting support](/aranet-rn+/aranet-radon-plus/troubleshooting/contacting-support) page.

Determine whether the problem affects the sensor itself, the display, the Bluetooth connection, or only the information shown in the app.

{% stepper %}
{% step %}

#### Record sensor details

Record the Sensor ID, serial number, and whether the sensor is a HOME or PRO version.
{% endstep %}

{% step %}

#### Note the issue timeline

Note when the issue started and whether the sensor was moved, restarted, updated, or reset beforehand.
{% endstep %}

{% step %}

#### Photograph warnings

Photograph any warning or error message.
{% endstep %}

{% step %}

#### Record software versions

Record the firmware version and Aranet Home app version.
{% endstep %}

{% step %}

#### Save needed history

Synchronize and export any history needed for the investigation before changing settings or clearing data.
{% endstep %}
{% endstepper %}

{% hint style="warning" %}
**Before proceeding:** Distinguish a restart from a measurement-data reset. A data reset permanently deletes stored measurements. Do not select it simply to troubleshoot a connection problem.
{% endhint %}


# Power & battery

Sensor does not start or restarts unexpectedly; liquid or physical damage.

## The sensor does not start

If the sensor does not respond, check its power supply before investigating its measurements. An image remaining on an E-Ink display does not prove that the sensor is still powered.

{% stepper %}
{% step %}

#### Check battery polarity

Check both AA batteries against the polarity markings.
{% endstep %}

{% step %}

#### Try fresh batteries

Try a fresh, matching pair of batteries.
{% endstep %}

{% step %}

#### Inspect the battery compartment

Inspect the battery compartment for leakage, corrosion, loose contacts, or physical damage.
{% endstep %}

{% step %}

#### Reinstall the batteries

Reinstall the batteries and follow any startup prompt using the side action switch.
{% endstep %}

{% step %}

#### Check operation

Check whether the display responds and measurement collection begins.
{% endstep %}
{% endstepper %}

**If the issue persists:** Contact support with a picture of the display and battery compartment. If there is liquid exposure or visible damage, follow [Liquid exposure or physical damage](#liquid-exposure-or-physical-damage).

## The sensor restarts unexpectedly or needs a restart

Repeated startup screens or interrupted operation may indicate an unstable battery connection. The most possible cause is battery-contact oxidation or corrosion.

{% stepper %}
{% step %}

#### Record restart conditions

Record when restarts occur and whether the sensor was moved beforehand.
{% endstep %}

{% step %}

#### Save evidence

Save the available history and photograph any warnings.
{% endstep %}

{% step %}

#### Inspect battery contacts

Remove the batteries and inspect the contacts.
{% endstep %}

{% step %}

#### Address oxidation

If oxidation is present, follow the manufacturer’s contact-cleaning instructions or ask support for assistance.
{% endstep %}

{% step %}

#### Install fresh batteries

Install a fresh, matching battery pair and observe operation.
{% endstep %}

{% step %}

#### Monitor for further interruptions

Check for further interruptions over subsequent days; a single successful startup does not establish that an intermittent issue is resolved.
{% endstep %}
{% endstepper %}

**If the issue persists:** Contact support. Do not perform repeated data resets to address intermittent power loss.

## Liquid exposure or physical damage

If problems started after a fall, liquid exposure, or use outside the specified conditions, describe that event in the support request.

{% stepper %}
{% step %}

#### Stop using the sensor

Stop using the sensor.
{% endstep %}

{% step %}

#### Remove the batteries

Remove the batteries if safe to do so.
{% endstep %}

{% step %}

#### Document damage

Photograph visible damage or contamination.
{% endstep %}

{% step %}

#### Contact support

Contact support before further testing.
{% endstep %}
{% endstepper %}

{% hint style="danger" %}
Do not open the measuring chamber, insert tools into its openings, rinse the sensor, or apply direct heat. Avoid attempting repairs that could affect the measurement system.
{% endhint %}


# Display & alerts

Blank, frozen or incomplete display; buzzer and colour indication; locked PRO sensor.

## The display is blank, frozen, or incomplete

First, check whether the sensor is still supplying new readings to the app. This helps distinguish a display problem from a power or measurement problem.

{% stepper %}
{% step %}

#### Check the latest app measurement

Check the latest measurement timestamp in Aranet Home.
{% endstep %}

{% step %}

#### Test the side action switch

Test whether the side action switch changes the display.
{% endstep %}

{% step %}

#### Check power and warnings

Check the batteries and look for a warning screen.
{% endstep %}

{% step %}

#### Check PRO lock status

For a PRO sensor displaying a logo or lock message, follow Section 18.
{% endstep %}

{% step %}

#### Restart if necessary

If necessary, use the restart procedure in Section 15.
{% endstep %}
{% endstepper %}

**If the issue persists:** Photograph lines, missing digits, or unchanged content and contact support. Do not press on or disassemble the display.

## The buzzer / colour indication doesn't behave as expected

Review the configured radon warning settings and the measurement period being displayed before treating the indication as faulty.

{% stepper %}
{% step %}

#### Check buzzer status

Check whether the buzzer is enabled.
{% endstep %}

{% step %}

#### Review warning settings

Review the configured warning thresholds and units.
{% endstep %}

{% step %}

#### Record the indication context

Record the displayed value, selected period, and indication together.
{% endstep %}

{% step %}

#### Allow the next measurement

Allow the next measurement to complete.
{% endstep %}

{% step %}

#### Restore temporary test settings

If testing requires a temporary settings change, restore the usual settings afterwards.
{% endstep %}

{% step %}

#### Check Pro lock status

For a locked PRO sensor, check Section 18.
{% endstep %}
{% endstepper %}

**If the issue persists:** Send support the settings and a photograph or video showing the behaviour. Phone notifications should be investigated separately from the sensor’s buzzer.

## Pro only — The sensor is locked or shows only the Aranet logo

The documented [Sensor Lock](/aranet-rn+/aranet-radon-plus/usage-and-measurements/sensor-lock-feature) feature applies to Radon Plus Pro with supported firmware. It can hide readings, block the side switch and new Bluetooth pairings, and disable the sound alarm. Existing pairings remain available.

{% stepper %}
{% step %}

#### Confirm the PRO version

Confirm that the sensor is the PRO version.
{% endstep %}

{% step %}

#### Use a previously paired phone

Use a phone already paired with it.
{% endstep %}

{% step %}

#### Check the lock setting

Open its settings and check **Lock device**.
{% endstep %}

{% step %}

#### Unlock the sensor

Unlock it if authorized to change the measurement setup.
{% endstep %}

{% step %}

#### Confirm normal operation

Confirm that the display and controls resume normal operation.
{% endstep %}
{% endstepper %}

**If the issue persists:** Contact support before deleting the existing pairing. Removing batteries is not the documented unlocking procedure.

**Related guide:** [Sensor Lock Feature](https://help.aranet.com/aranet-rn+/aranet-radon-plus/usage-and-measurements/sensor-lock-feature)


# Bluetooth & app

Sensor not found in the app, pairing fails, readings do not update.

## The sensor does not appear in Aranet Home

Check Bluetooth availability and app permissions before removing existing pairings or reinstalling the app.

{% stepper %}
{% step %}

#### Open Aranet Home nearby

Open the current Aranet Home app and move the phone close to the sensor.
{% endstep %}

{% step %}

#### Enable Bluetooth

Confirm that Bluetooth is enabled on both devices.
{% endstep %}

{% step %}

#### Allow phone permissions

Allow the Bluetooth, Nearby devices, or other permissions requested by the phone’s operating system.
{% endstep %}

{% step %}

#### Add the device

Start adding a device in the app and identify it by its Sensor ID.
{% endstep %}

{% step %}

#### Restart the phone

If necessary, restart the phone and repeat discovery.
{% endstep %}

{% step %}

#### Test another compatible phone

Test with another compatible phone.
{% endstep %}
{% endstepper %}

**If the issue persists:** Record whether another phone can discover it. For a locked Pro sensor, use the previously paired phone and select [Sensor is locked](/aranet-rn+/aranet-radon-plus/troubleshooting/display-and-alerts#pro-only-the-sensor-is-locked-or-shows-only-the-aranet-logo) before deleting any pairing.

## Pairing fails / pairing code does not work

Use this section when the sensor is discovered but cannot be added to the app.

{% stepper %}
{% step %}

#### Match the Sensor ID

Match the Sensor ID in the app with the physical sensor.
{% endstep %}

{% step %}

#### Start pairing in Aranet Home

Start pairing through Aranet Home.
{% endstep %}

{% step %}

#### Enter the displayed code

Follow the phone’s pairing prompt using the code currently displayed on the sensor. \[1]
{% endstep %}

{% step %}

#### Record errors

Record any error message or missing prompt.
{% endstep %}

{% step %}

#### Save data before removing obsolete pairings

If needed, save required data before removing an obsolete pairing and trying again.
{% endstep %}

{% step %}

#### Try a second phone

Try a second phone to distinguish a phone-specific issue from a sensor issue.
{% endstep %}
{% endstepper %}

**Expected result:** The app can read the sensor and access its settings.

## App readings do not update / connection drops

Distinguish an old app reading from a sensor that has stopped measuring. Radon readings update every 10 minutes; reconnecting repeatedly will not create a new measurement sooner.

{% stepper %}
{% step %}

#### Compare timestamps

Compare the latest app timestamp with the sensor display.
{% endstep %}

{% step %}

#### Synchronize nearby

Open the app near the sensor and allow synchronization to finish.
{% endstep %}

{% step %}

#### Check phone restrictions

Check phone permissions and background operation restrictions.
{% endstep %}

{% step %}

#### Stop other active connections

Temporarily stop other software from actively connecting during the test.
{% endstep %}

{% step %}

#### Test distance

Check whether the problem depends on distance or also occurs close to the sensor.
{% endstep %}

{% step %}

#### Test another phone

Test another phone if needed.
{% endstep %}
{% endstepper %}

**If the issue persists:** Record whether only the app is stale or the sensor itself has stopped producing readings. Use the section below for history-specific problems.


# Radon readings

First reading, current vs average values, unexpected readings, comparison with another detector.

## The first radon reading has not appeared

Radon Plus needs time to collect its initial measurement. The first result normally appears after approximately 10 minutes; one hour is the period needed for a first reliable result. This does not mean every short-term reading has the same uncertainty as a long-term average.

{% stepper %}
{% step %}

#### Confirm startup

Confirm that startup has completed and record the start time.
{% endstep %}

{% step %}

#### Keep suitable conditions

Leave the sensor powered and stationary in suitable indoor conditions.
{% endstep %}

{% step %}

#### Allow the initial measurement period

Allow the initial measurement period to finish.
{% endstep %}

{% step %}

#### Check for warnings or restarts

Check for a humidity warning or repeated restart instead of normal progress.
{% endstep %}

{% step %}

#### Document and contact support

If there is still no reading after an hour, document the screen and contact support.
{% endstep %}
{% endstepper %}

**Expected result:** Radon readings become available without repeated restarts or resets.

## Current and average radon readings differ

Current readings and averages describe different time periods. A 24-hour, 7-day, or 30-day average can remain elevated after recent readings fall because it includes earlier measurements. A status indicator may appear when the sensor has not yet operated for the full selected averaging period.

{% stepper %}
{% step %}

#### Identify the selected period

Identify the period selected on the sensor and in the app.
{% endstep %}

{% step %}

#### Compare equivalent values

Compare values representing the same period and units.
{% endstep %}

{% step %}

#### Check available history

Check the time elapsed since startup or the last data reset.
{% endstep %}

{% step %}

#### Review the graph

Review the graph for earlier readings that explain the average.
{% endstep %}

{% step %}

#### Allow data to accumulate

Allow enough data to accumulate for the selected period.
{% endstep %}
{% endstepper %}

**Expected result:** Differences can be explained by the selected period and available history. Do not reset valid data merely to make an average match the latest reading.

## Radon readings seem too high, too low, or variable

Investigate both measurement conditions and the pattern over time. Changes in ventilation, room use, and location can change actual radon concentration. Short-term fluctuations alone do not establish a fault.

{% stepper %}
{% step %}

#### Keep a representative location

Keep the sensor in one representative indoor location with unobstructed air access.
{% endstep %}

{% step %}

#### Record environmental changes

Record changes in ventilation, heating, location, or occupancy alongside the readings.
{% endstep %}

{% step %}

#### Compare trends and averages

Compare the recent trend with averages over a longer period.
{% endstep %}

{% step %}

#### Check for warnings and handling

Check for humidity warnings and recent handling.
{% endstep %}

{% step %}

#### Allow static effects to clear

If a reading jumped immediately after rubbing or handling the enclosure, leave the sensor undisturbed and check subsequent measurements. Static electricity can temporarily cause false high readings. \[3]
{% endstep %}

{% step %}

#### Compare with another detector

If an unexplained deviation persists, follow the comparison procedure in Section 6.
{% endstep %}
{% endstepper %}

**If the issue persists:** Send support the graph and exported measurements. Avoid treating unexpectedly high readings as a device fault without checking them; follow applicable local radon guidance when levels remain elevated.

## Readings differ from another radon detector

A useful comparison requires both detectors to sample the same environment during the same period. Different response speeds and averaging methods can produce different values during changing conditions.

{% stepper %}
{% step %}

#### Identify the reference detector

Identify the reference detector model and its calibration or verification status.
{% endstep %}

{% step %}

#### Place detectors together

Place both detectors together with normal air access, avoiding direct airflow or heat sources.
{% endstep %}

{% step %}

#### Confirm units

Confirm that both use the same units. **1 pCi/L equals 37 Bq/m³.**
{% endstep %}

{% step %}

#### Allow the detectors to respond

Allow both detectors to complete their specified startup periods and respond to the new location.
{% endstep %}

{% step %}

#### Compare overlapping data

As an initial troubleshooting check, compare at least 24 hours of overlapping data, preferably longer where practical. This is a comparison procedure, not a substitute for an official radon test protocol.
{% endstep %}

{% step %}

#### Compare equivalent averages

Compare averages covering the same start and end times, rather than isolated screen readings.
{% endstep %}

{% step %}

#### Record specifications

Record both instruments’ stated accuracy and averaging methods.
{% endstep %}
{% endstepper %}

**If the issue persists**, provide support with the paired results and test conditions. A large, persistent difference after a controlled comparison should be investigated rather than repeatedly attributed to startup or placement.


# Measurements & data

High humidity warning; temperature, humidity or pressure readings; gaps in history.

## High humidity warning appears

Humidity outside the specified operating conditions can interfere with radon detection. Move the sensor to a drier location within its operating range. Recovery may take up to an hour. The warning threshold should not be treated as permission to operate outside the datasheet limits. \[3]

{% stepper %}
{% step %}

#### Record the warning

Photograph the warning and record the humidity reading.
{% endstep %}

{% step %}

#### Move to a drier location

Move the sensor away from the source of humidity.
{% endstep %}

{% step %}

#### Allow recovery

Leave it undisturbed in suitable conditions and check for normal readings to resume.
{% endstep %}

{% step %}

#### Avoid direct drying

Avoid direct heating or attempting to dry the measuring chamber internally.
{% endstep %}

{% step %}

#### Contact support if needed

If the warning remains after the recovery period, contact support.
{% endstep %}
{% endstepper %}

**If liquid or condensation entered the sensor:** Follow [Liquid exposure or physical damage](/aranet-rn+/aranet-radon-plus/troubleshooting/power-and-battery#liquid-exposure-or-physical-damage) instead of assuming that a humidity warning is the only issue.

## Temperature, humidity, or pressure readings seem incorrect

Compare instruments under the same conditions. After moving the sensor, temperature and humidity need time to settle. Radon Plus reports absolute atmospheric pressure; weather services may show pressure adjusted to sea level. Pressure is available in the app rather than on the sensor display.

{% stepper %}
{% step %}

#### Place instruments together

Place the sensor and reference together, away from sunlight, heat sources, and direct airflow.
{% endstep %}

{% step %}

#### Allow readings to stabilize

Allow readings to stabilize without holding either instrument.
{% endstep %}

{% step %}

#### Check units and timestamps

Check the units and measurement timestamps.
{% endstep %}

{% step %}

#### Confirm the pressure reference

For pressure, confirm that both values use the same pressure reference.
{% endstep %}

{% step %}

#### Compare specifications

Compare the difference with both instruments’ specifications.
{% endstep %}
{% endstepper %}

**If the issue persists**, provide the reference model, values, comparison duration, and conditions. Clearing radon history is not a correction for temperature, humidity, or pressure.

## Measurement history is missing / containing gaps

History shown in the app depends on successful synchronization and the measurements still available to download. Check the requested dates before assuming that the sensor stopped measuring.

{% stepper %}
{% step %}

#### Verify the sensor and date range

Verify the selected sensor and graph date range.
{% endstep %}

{% step %}

#### Synchronize completely

Synchronize nearby and wait for the download to finish.
{% endstep %}

{% step %}

#### Check for relevant changes

Check whether a measurement-data reset, power interruption, phone change, or app reinstallation occurred.
{% endstep %}

{% step %}

#### Record gap boundaries

Record the exact beginning and end of each gap.
{% endstep %}

{% step %}

#### Export available measurements

Export available measurements before further changes.
{% endstep %}

{% step %}

#### Check history capacity

Check the applicable documentation for the sensor’s current history capacity.
{% endstep %}
{% endstepper %}

**If the issue persists:** Send support the affected periods and export. Resetting data cannot recover missing measurements and may remove evidence needed for diagnosis.


# Firmware & data reset

Firmware update fails; resetting measurement data.

## Firmware update fails

Identify whether the failure occurs while checking for an update, downloading it, or transferring it to the sensor.

{% stepper %}
{% step %}

#### Record version and error details

Record the installed version, proposed update, and exact error.
{% endstep %}

{% step %}

#### Update the app and check the internet

Update Aranet Home and check the phone’s internet connection.
{% endstep %}

{% step %}

#### Check power and proximity

Confirm adequate battery power and keep the phone close to the sensor.
{% endstep %}

{% step %}

#### Complete the update process

Follow the update prompts and allow the process to finish.
{% endstep %}

{% step %}

#### Verify the sensor status

If the app reports a failure, check whether the sensor is still discoverable and which version it reports.
{% endstep %}

{% step %}

#### Use applicable recovery instructions

Use only recovery instructions applicable to Radon Plus, or contact support.
{% endstep %}
{% endstepper %}

**Expected result:** The installed version can be verified, and normal measurement collection resumes. Keep version-specific recovery instructions as a separate procedure.

## Resetting measurement data

Use a measurement reset only when you deliberately need to start a new data collection period. It deletes measurements; it is not a calibration procedure or a routine connection fix.

### Before resetting

{% stepper %}
{% step %}

#### Export required history

Export the history you need.
{% endstep %}

{% step %}

#### Record reset details

Record the sensor location and reset time.
{% endstep %}

{% step %}

#### Confirm the intent

Confirm that a fresh measurement period is intended.
{% endstep %}

{% step %}

#### Follow reset instructions

Follow the Radon Plus reset instructions and read the deletion prompt.
{% endstep %}

{% step %}

#### Allow new data to accumulate

Allow new readings and averages to accumulate afterwards.
{% endstep %}
{% endstepper %}

**Expected result:** New data collection starts. For suspected measurement error, use Section 6 and contact support for verification options rather than trying to calibrate the sensor by clearing its history.


# Contacting support

What to prepare and how to contact Aranet Technical Support.

Record error messages exactly, including any code. Different errors may require different procedures.

## Information to include

* Sensor ID, serial number, HOME or PRO version, and hardware revision if available.
* Firmware and Aranet Home app versions.
* Phone model and operating system.
* Photographs of the display and relevant settings.
* When the issue started and whether it follows a repeatable pattern.
* Checks performed and the outcome of each.
* Exported measurements with dates, times, and time zone.
* For comparisons, reference detector details, units, overlapping periods, and both results.
* Any humidity exposure, impact, battery problem, restart, or reset preceding the issue.

Contact **<support@aranet.com>**. If a return is required, use the [RMA form](https://rma.aranet.com/).


# Device Care

This page explains recommended maintenance procedures, battery handling guidelines, and safety considerations for proper device operation.


# Handling and Cleaning

The Aranet devices are advanced electronic devices in a plastic case.&#x20;

{% hint style="info" %}
You should handle and clean them in the same way you deal with other household electronic devices.
{% endhint %}

#### Handling

* Aranet devices are not impact-resistant; do not drop or hit them.
* Aranet devices are not waterproof; do not use them in high humidity environments (greater than 85%).
* Do not leave Aranet devices in direct sunlight. This can damage the E-ink screen
* Do not expose Aranet devices to strong electromagnetic fields.
* Aranet devices are intended for use at temperatures 0 °C to 50 °C (32 °F to 122 °F). Exposure to lower temperatures can damage the device.

#### Cleaning

You can clean your Aranet device with lukewarm water and mild soap. Mix some soap and water in a bucket, and clean the case using a slightly wet soft sponge or microfiber cloth to avoid scratching the material and water drops entering the case. Make sure your detergent has no harsh chemicals that could damage the plastic and sensor, such as white spirits or Clorox.

#### Disinfecting

Alcohol solutions (alcohol / purified water) or wipes with at least 70 per cent alcohol are effective for the sanitization of the Aranet case. First, clean the surface with soap and water as described above. Apply the alcohol solution and let it sit on the surface for at least 30 seconds to disinfect. Wipe dry with a clean cloth.

You can use low-power household UV disinfectors for Aranet Radon Plus disinfection, too. Follow the UV-disinfector instructions and do not overexpose the Aranet Radon Plus to UV radiation.


# FAQ

This page explains common questions and answers related to Aranet Radon Plus functionality, configuration, and troubleshooting.

<details>

<summary>How can I adjust the settings on Aranet Radon Plus sensor?</summary>

Settings can be adjusted using the button on the side of the sensor or through the Aranet Home mobile app.

</details>

<details>

<summary>Do I need to register to use the device?</summary>

No registration is necessary. You can use the Aranet Radon Plus sensor as a standalone device or sync it with the free Aranet Home app for a comprehensive data history and analysis.

</details>

<details>

<summary>How often does Aranet Radon Plus sensor transmit data?</summary>

Aranet Radon Plus sensor updates the radon level reading every 10 minutes, with the first highly reliable result in just one hour.

</details>

<details>

<summary>What is the purpose of the color-coded indication bars on the sensor?</summary>

The color-coded bars (green, yellow, red) indicate the radon concentration levels and warn you of unhealthy levels. The thresholds for these bars can be adjusted via the Aranet Home app. The default thresholds are set following the World Health Organization (WHO) Radon guidelines.

</details>

<details>

<summary>How fast do I get the first radon reading?</summary>

You’ll see the first result in about 10 minutes after setup.

</details>

<details>

<summary>When is the reading fully accurate?</summary>

Accuracy stabilizes within 1 hour of operation. Long-term averages (24h, 7d, 30d) refine precision further.

</details>

<details>

<summary>Where should I place the monitor at home?</summary>

Place it on a flat surface on the lowest lived-in level, such as a basement or ground-floor room. Keep it away from direct sunlight and high humidity (over 85%). Or you can refer to the information provided on the page: [Placing the Sensor](/aranet-rn+/aranet-radon-plus/usage-and-measurements/placing-the-sensor)

</details>

<details>

<summary>What are the recommendations for indoor air humidity?</summary>

Indoor humidity levels should range from 30% to 50%. This range supports comfort and health, while also helping to prevent mold growth.

</details>

<details>

<summary>How do I change the temperature measurement unit type?</summary>

It is possible to change the temperature measurement unit type separately both on the Aranet Radon Plus sensor display, using the switch that is located on the side of device and in the Aranet Home app. The temperature can be displayed in either Celsius or Fahrenheit degrees in both places.

The temperature measurement unit on the Aranet Radon Plus sensor display can be changed with the help of the second dip switch in the battery compartment.

</details>

<details>

<summary>Does it work without cables or Wi-Fi?</summary>

Yes. It’s battery-powered and cable-free. Bluetooth is optional and used only if you connect it to the Aranet Home app.

</details>

<details>

<summary>How to export measurement data from the Aranet Home App?</summary>

Simply go into your Aranet Home App and tap the dashboard view in the top right corner. Once there, tap on the “Sharing” icon in the top right corner and choose how you would like to share or download it.

</details>

<details>

<summary>How can I extend the warranty on my Aranet Home products?</summary>

You can extend the warranty of your Aranet Home products by an additional 12 months by registering the product and agreeing to receive email updates from SAF Tehnika. You can withdraw your consent to receive emails anytime without affecting the extended warranty.

[Register your product](https://aranet.com/en/home/register-product)<br>

</details>

<details>

<summary>How can I return my Aranet sensor?</summary>

If you’re facing issues with your product, please fill in the returns form.

[Return form](https://rma.aranet.com/)

</details>

<details>

<summary>Why is my Aranet Radon Plus restarting unexpectedly?</summary>

If your Radon Plus sensor is restarting unexpectedly, the cause may be oxidation or corrosion on the battery contacts.

Please follow these steps:

1. Remove the batteries.
2. Carefully clean the battery contacts using a small flat-head screwdriver or another suitable tool to gently remove any oxidation or corrosion.
3. Reinstall the batteries.
4. Check whether the sensor is operating normally.
5. Monitor your device for at least a month.

If the problem persists after cleaning the contacts, please contact our support team for further assistance.

Or fill out the [RMA](https://rma.aranet.com/) form.

</details>


# Aranet Radon One

The Aranet Radon One is a wireless radon sensor designed for flexible environmental monitoring applications. It delivers precise measurements and seamless integration with the Aranet ecosystem for centralized data collection and analysis. This section provides detailed information on device specifications, setup procedures, usage recommendations, and maintenance guidance.

{% columns %}
{% column %}
{% content-ref url="/pages/RyMPfD9KkbRnJ0rlFcio" %}
[General](/aranet-rn-one/aranet-radon-one/general)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
{% content-ref url="/pages/qC4gDr0dbdu9D9OIEHVP" %}
[Documents and Firmware](/aranet-rn-one/aranet-radon-one/documents-and-firmware)
{% endcontent-ref %}
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column %}
{% content-ref url="/pages/lwKQEIjZN2ncdes44bMd" %}
[Usage and Measurements](/aranet-rn-one/aranet-radon-one/usage-and-measurements)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
{% content-ref url="/pages/DkTAye3GkQTCtPDkE0XC" %}
[Maintenance and Safety](/aranet-rn-one/aranet-radon-one/maintenance-and-safety)
{% endcontent-ref %}
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column %}
{% content-ref url="/pages/t0ZML5ryaj418J70ZEx1" %}
[FAQ](/aranet-rn-one/aranet-radon-one/faq)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
{% content-ref url="/pages/9at6Yt8lj3urMnVp8Eoa" %}
[Quick Start Guide](/aranet-rn-one/aranet-radon-one/quick-start-guide)
{% endcontent-ref %}
{% endcolumn %}
{% endcolumns %}


# General

This page explains the main features and functionality of the Aranet Radon One device, including its measurements, display indicators, and basic operating principles.


# What Does the Aranet Rn One Do?

The Aranet Radon One provides real-time measurements of radon gas concentration. With its portability and extended multi-year battery life, this device ensures convenience and reliability in continuous indoor air quality monitoring. This sensor, belonging to the Home sensor series, is intended to be used together with the Aranet Home mobile application for extended data browsing capabilities.

#### What Does Aranet Radon One Measure?

#### Radon Gas

Radon gas is tasteless, odourless, and hard to detect, posing serious health risks. It escapes from the ground into the air and can accumulate in your home. According to the [World Health Organisation](https://www.who.int/news-room/fact-sheets/detail/radon-and-health), radon is one of the leading causes of lung cancer. Since its levels can fluctuate, regular radon monitoring is vital. Aranet Radon One sensor offers real-time radon monitoring. It is the fastest sensor on the market – offering first measurements already after 10 minutes and refined measurements after 1h. The e-ink display and long battery life make it ideal for continuous indoor air quality monitoring.


# Device Lifespan

The battery life of two AA batteries that the device uses is dependent on some conditions. See the table below:

| Alkaline batteries, Bluetooth Off | Alkaline batteries, Bluetooth On | Lithium batteries, Bluetooth Off | Lithium batteries, Bluetooth On |
| --------------------------------- | -------------------------------- | -------------------------------- | ------------------------------- |
| 5.0 years                         | 3.4 years                        | 7.0 years                        | 4.7 years                       |

#### Waste of electronics

Waste batteries and electronic equipment must be taken to household hazardous waste collection points! You may search the internet for the closest collection point in the area you are located.

**Never** put these items in household garbage or recycling bins!

**Do not expose** the batteries to fire! Do not dismantle them!

Waste of batteries and electronic equipment can contain substances and materials that can harm the environment and living beings, if treated as regular household waste.


# Power Options

The Aranet Radon One sensor runs on standard AA batteries. Out-of-the-box, it uses **two AA batteries**, which — thanks to its power-efficient e-ink display and smart power management — can last for a few years and potentially much longer if data updates are infrequent.


# Documents and Firmware

This page explains how to access product documentation, download firmware updates, and maintain the latest device software version.


# Documents

**Datasheet:**

[Aranet Radon One Datasheet](https://aranet.com/downloads/aranet-radon-one-home-datasheet)

**Quick Start Guide:**

[Aranet Radon One Quick Start Guide](https://aranet.com/downloads/aranet-radon-one-home-quick-start-guide)


# Firmware Changelog

Aranet Radon One

v1.15.24 - Jun 18 2026

Improved radon concentration calculation algorithm.

v1.11.3 - initial firmware


# How to Update Firmware

Starting with Aranet Home app version v2.0, a firmware update can be done as follows:

{% columns %}
{% column valign="middle" %}
Locate the sensor you need to perform the update on. Then click on the three-dot icon and find *Device Settings.*

Scroll down and find the *Firmware Update* option and press it.

In the next window, if there is an update, you will be able to perform one. If not, then a message *Up to date* will be displayed.
{% endcolumn %}

{% column %}

<div data-with-frame="true"><figure><img src="https://3048448099-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fb6ZpsMVJVtm3lJva9pRg%2Fuploads%2FjNddNnr0QNmPlZBiZ7sq%2Ffirmware-update.gif?alt=media" alt="" width="135"><figcaption></figcaption></figure></div>
{% endcolumn %}
{% endcolumns %}

{% hint style="info" %}
Sometimes there might be an issue where the sensor is stuck during some operation, for example, a firmware upgrade.
{% endhint %}

If you are stuck in the update process, it is advised to open the Aranet Home app and try to add a new sensor. In most cases, this sensor will be discovered, paired back to the app, and working again. If the issue still persists, please contact <support@aranet.com> or refer to the information in another topic: [Stuck in Firmware Upgrade Mode](/aranet-rn-one/aranet-radon-one/documents-and-firmware/stuck-in-firmware-upgrade-mode)


# Stuck in Firmware Upgrade Mode

If your Aranet device gets stuck in a firmware update, then follow these steps:

{% hint style="warning" %}
This only works from the Aranet Home app v3.4.2. As such, you should update your app before trying this.
{% endhint %}

1. Remove batteries and place them back after a few minutes.
2. Do “PAIR NEW DEVICE” from the application settings menu – the app will find the failed Aranet Radon One device and will start firmware recovery

<div data-with-frame="true"><figure><img src="https://3048448099-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fb6ZpsMVJVtm3lJva9pRg%2Fuploads%2FCqhaFCg9BTy1PGD3ibjD%2Fstuck-in-firmware-upgrade-mode.png?alt=media" alt=""><figcaption></figcaption></figure></div>


# Usage and Measurements

This page explains how Aranet Radon One performs measurements, including sensor behavior, data interpretation, and measurement intervals.


# Data Storage

Radon One Sensor is compatible with smart devices conforming to Bluetooth specification 4.1 and up.
\
Bluetooth is utilized to enable the functionality of the Aranet Home mobile application. When transferring data to
&#x20;Aranet Home, **device memory provides 30 days historic data availability**.


# Default Settings

The Aranet Radon One sensor is calibrated in the factory, and it works instantly when you take it out of the box and insert the batteries – no additional setup is needed. These are the default settings of the Aranet Radon One sensor:

1. The default radon measurement units are set to Bq/m<sup>3</sup>;
2. Bluetooth connection is enabled;
3. Bluetooth connection transmission range is set to normal;
4. The buzzer for audio sound alarm notifications is disabled;


# Where to Place the Device in a Room

For accurate readings, the **Aranet Radon One sensor** should be placed where radon is most likely to accumulate and where people actually spend time. In homes, this is typically the **lowest regularly occupied level** (such as a basement or ground floor). Position the device **0.8–2 meters (2.5–6.5 ft)** above the floor, in an open area with normal air circulation. Avoid placing it near windows, doors, ventilation outlets, or exterior walls, as drafts and fresh air can dilute radon levels and distort measurements. Do not place the sensor in kitchens, bathrooms, or directly next to heat sources or electronic devices. A stable, central location away from direct sunlight will provide the most representative long-term radon measurements.

The Aranet Radon One sensor should not be placed in direct sunlight or in areas with a risk of splashing the sensor with different liquids, or high-humidity environments (higher than 85%), such as your bathroom. Place the sensor in a safe place where it cannot accidentally be dropped because it isn’t drop-proof.


# Maintenance and Safety

This page explains recommended maintenance procedures, battery handling guidelines, and safety considerations for proper device operation.


# Handling and Cleaning

The Aranet devices are advanced electronic device in a plastic case. You should handle and clean it the same way you deal with other household electronic devices.

#### Handling

* Aranet devices are not impact-resistant; do not drop or hit it.
* Aranet devices are not waterproof; do not use it in high humidity environments (greater than 85%).
* Do not leave Aranet devices in direct sunlight. This can damage the E-ink screen
* Do not expose Aranet devices to strong electromagnetic fields.
* Aranet devices are intended for use at temperatures 0 °C to 50 °C (32 °F to 122 °F). Exposure to lower temperatures can damage the device.

#### Cleaning

You can clean your Aranet device with lukewarm water and mild soap. Mix some soap and water in a bucket, clean the case using a slightly wet soft sponge or microfiber cloth to avoid scratching the material and water drops entering the case. Make sure your detergent has no harsh chemicals that could damage the plastic and sensor, such as white spirits or Clorox.

#### Disinfecting

Alcohol solutions (alcohol / purified water) or wipes with at least 70 per cent alcohol are effective for the sanitization of the Aranet case. First, clean the surface with soap and water as described above. Apply the alcohol solution and let it sit on the surface for at least 30 seconds to disinfect. Wipe dry with a clean cloth.

You can use low-power household UV-disinfectors for Aranet Radon One disinfection, too. Follow the UV-disinfector instructions and do not overexpose Aranet Radon One to UV radiation.


# FAQ

This page explains common questions and answers related to Aranet Radon One functionality, configuration, and troubleshooting.

<details>

<summary>Do I need to register to use the device?</summary>

No registration is necessary. You can use Aranet Radon One sensor as a standalone device or sync it with the free Aranet Home app for a comprehensive data history and analysis.

</details>

<details>

<summary>What is the purpose of the color-coded indication bars on the sensor?</summary>

The color-coded bars (green, yellow, red) indicate the radon concentration levels and warn you of unhealthy levels. The thresholds for these bars can be adjusted via the Aranet Home app. The default thresholds are set following the World Health Organization (WHO) Radon guidelines.

</details>

<details>

<summary>How fast do I get the first radon reading?</summary>

You’ll see the first result about 10 minutes after setup.

</details>

<details>

<summary>When is the reading fully accurate?</summary>

Accuracy stabilizes within 1 hour of operation. Long-term averages (24h, 7d, 30d) refine precision further.

</details>

<details>

<summary>Where should I place the monitor at home?</summary>

Place it on a flat surface in the lowest lived-in level, such as a basement or ground-floor room. Keep it away from direct sunlight and high humidity (over 85%).

</details>

<details>

<summary>Does it work without cables or Wi-Fi?</summary>

Yes. It’s battery-powered and cable-free. Bluetooth is optional and used only if you connect it to the Aranet Home app.

</details>

<details>

<summary>How to export measurement data from Aranet Home App?</summary>

Simply go into your Aranet Home App, and tap onto the dashboard view in the top right corner. Once there, tap on the “Sharing” icon in the top right corner and choose how you would like to share or download it.

</details>

<details>

<summary>How can I extend the warranty on my Aranet Home products?</summary>

You can extend the warranty of your Aranet Home products by an additional 12 months by registering the product and agreeing to receive email updates from SAF Tehnika. You can withdraw your consent to receive emails anytime without affecting the extended warranty.

[Register your product](https://aranet.com/en/home/register-product)<br>

</details>

<details>

<summary>How can I return my Aranet sensor?</summary>

If you’re facing issues with your product, please fill in the returns form.

[Return form](https://rma.aranet.com/)

</details>


# Aranet Radiation sensor

The **Aranet Radiation Sensor** is designed to measure ionizing radiation. It is calibrated for γ (gamma) radiation and can also detect β (beta) radiation and X-rays. The sensor shows the current dose rate (µSv/h or mrem/h) and the accumulated total dose (mSv or rem), helping you monitor your radiation exposure at home or wherever you go. This section includes device information, placement guidelines, default settings, firmware updates, and maintenance recommendations to ensure reliable measurements.

{% columns %}
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[General](/aranet-radiation-sensor/aranet-radiation-sensor/general)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
{% content-ref url="/pages/aCGaiAhWPdqZ7H0n6uRI" %}
[Documents and Firmware](/aranet-radiation-sensor/aranet-radiation-sensor/documents-and-firmware)
{% endcontent-ref %}
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column %}
{% content-ref url="/pages/XJj49RW5kGT9MNqw0cHM" %}
[Usage and Measurements](/aranet-radiation-sensor/aranet-radiation-sensor/usage-and-measurements)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
{% content-ref url="/pages/QWiQixvBSwmRvYG56tOq" %}
[Maintenance and Safety](/aranet-radiation-sensor/aranet-radiation-sensor/maintenance-and-safety)
{% endcontent-ref %}
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column %}
{% content-ref url="/pages/OhyjUSxTOFHEKgcRuQtc" %}
[FAQ](/aranet-radiation-sensor/aranet-radiation-sensor/faq)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
{% content-ref url="/pages/RotMDjPvklIewphTuphg" %}
[Quick Start Guide](/aranet-radiation-sensor/aranet-radiation-sensor/quick-start-guide)
{% endcontent-ref %}
{% endcolumn %}
{% endcolumns %}


# General

This page explains the main features and functionality of the Aranet Radiation device, including its measurements, display indicators, and basic operating principles.


# What Does the Aranet Radiation Sensor Do?

Keep your mind calm! The Aranet Radiation Sensor is designed to monitor dangerous levels of ionising radiation (γ, β), so you can be aware of and follow your total dose of exposure anywhere you go. Battery life of up to 4 years provides continuous measurements with wireless access to your radiation exposure history through the Aranet Home app.

#### What does Aranet Radiation measure?

#### Dose Rate

It describes how strong the ionizing radiation (γ, β) is at a given moment. It is expressed in microsieverts per hour (µSv/h) or millirems per hour (mrem/h). If radiation levels rise, the device uses colors (green, yellow, and red) to alert you, dimming the screen for high values (red level). The default threshold levels are based on scientific recommendations 1-4, but you can adjust them as needed through the Aranet Home app.

#### Total Dose

Total dose of ionizing radiation (γ, β) encountered during the integration time is expressed in millisieverts (mSv) or rems (rem). Total dose of ionizing radiation is a critical metric for ensuring environmental safety and personal health. If the average rate at which the total dose has been acquired exceeds 0.20 μSv/h, then the upper part of the screen will be dimmed. This reading can be reset from the Aranet Home app or by pushing the mechanical button behind the battery compartment lid. To perform a reset, press and hold the button for 5 seconds.

Scientific recommendations:

1. <https://www.cdc.gov/radiation-emergencies/causes/radiation-thermometer.html?CDC_AAref_Val=https://www.cdc.gov/nceh/radiation/emergencies/radiationthermometer.htm>
2. <https://remap.jrc.ec.europa.eu/Consent/Advanced.aspx>
3. <https://www.bfs.de/EN/bfs/we/we_node.html>
4. <https://www.nea.gov.sg/our-services/radiation-safety/understanding-radiation/health-effects-of-ionising-radiation-on-people>


# Device Lifespan

The battery life of the two AA batteries that the device uses is dependent on some conditions. See the table below:

| Measurement interval | Alkaline batteries, Bluetooth Off | Alkaline batteries, Bluetooth On | Lithium batteries, Bluetooth Off | Lithium batteries, Bluetooth On |
| -------------------- | --------------------------------- | -------------------------------- | -------------------------------- | ------------------------------- |
| 1 min                | 1.7 years                         | 1.5 years                        | 2.2 years                        | 2.0 years                       |
| 2 min                | 2.6 years                         | 2.1 years                        | 3.5 years                        | 2.8 years                       |
| 5 min                | 4.0 years                         | 2.9 years                        | 5.5 years                        | 3.8 years                       |
| 10 min               | 4.8 years                         | 3.2 years                        | 6.7 years                        | 4.4 years                       |

#### Waste of electronics

Waste batteries and electronic equipment must be taken to household hazardous waste collection points! You may search the internet for the closest collection point in the area you are located.

**Never** put these items in household garbage or recycling bins!

**Do not expose** the batteries to fire! Do not dismantle them!

Waste of batteries and electronic equipment can contain substances and materials that can harm the environment and living beings, if treated as regular household waste.


# Power Options

The Aranet Radiation sensor runs on standard AA batteries. Out-of-the-box, it uses **two AA batteries**, which — thanks to its power-efficient e-ink display and smart power management — can last for a few years and potentially much longer if data updates are infrequent.


# Documents and Firmware

This page explains how to access product documentation, download firmware updates, and maintain the latest device software version.


# Documents

**The Quick Start Guide**:

[Aranet Radiation Sensor Quick Start Guide](https://aranet.com/downloads/aranet-radiation-home-quick-start-guide)

**Datasheet:**

[Aranet Radiation Sensor Datasheet](https://aranet.com/downloads/aranet-radiation-home-datasheet)

**Leaflet:**

[Aranet Radiation Sensor Leaflet](https://aranet.com/downloads/aranet-radiation-sensor-leaflet)<br>


# Firmware Changelog

Aranet Radiation

v1.9.1:&#x20;

* Improved display driver stability.
* Improved new battery detection in low battery state. GUI:
* Added "cumulative dose over measurable range" indication.
* Added sensor ID on pairing screen.
* Improved icons.

\
v1.4.42:

* &#x20;Introduction of unreliable measurement data improvement progress bar
* Dynamic moving average calculation improvements
* Stability improvements

v1.4.38 - initial firmware


# How to Update Firmware

Starting with Aranet Home app version v2.0, a firmware update can be done as follows:

{% columns %}
{% column valign="middle" %}
Locate the sensor you need to perform the update on. Then click on the three-dot icon and find *Device Settings.*

Scroll down and find the *Firmware Update* option and press it.

In the next window, if there is an update, you will be able to perform one. If not, then a message *Up to date* will be displayed.
{% endcolumn %}

{% column %}

<div data-with-frame="true"><figure><img src="https://3348039115-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgM7507pq0wfMQak6jy2F%2Fuploads%2FgQNL1wqki4Lj9MjHtnnm%2Ffirmware-update.gif?alt=media" alt="" width="135"><figcaption></figcaption></figure></div>
{% endcolumn %}
{% endcolumns %}

{% hint style="info" %}
Sometimes there might be an issue where the sensor is stuck during some operation, for example, a firmware upgrade.
{% endhint %}

If you are stuck in the update process, it is advised to open the Aranet Home app and try to add a new sensor. In most cases, this sensor will be discovered, paired back to the app, and working again. If the issue still persists, please contact <support@aranet.com> or refer to the information in another topic: [Stuck in Firmware Upgrade Mode](/aranet-radiation-sensor/aranet-radiation-sensor/documents-and-firmware/stuck-in-firmware-upgrade-mode)


# Stuck in Firmware Upgrade Mode

If your Aranet device gets stuck in a firmware update, then follow these steps:

{% hint style="warning" %}
This only works from the Aranet Home app v3.4.2. As such, you should update your app before trying this.
{% endhint %}

1. Remove batteries and place them back after a few minutes.
2. Do “PAIR NEW DEVICE” from the application settings menu – the app will find the failed Aranet Radiation device and will start firmware recovery

<div data-with-frame="true"><figure><img src="https://3348039115-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgM7507pq0wfMQak6jy2F%2Fuploads%2Fj0uuMMTjCEZfDEoB6NFS%2Fpair-new-device.png?alt=media" alt=""><figcaption></figcaption></figure></div>


# Usage and Measurements

This page explains how Aranet Radiation sensor performs measurements, including sensor behavior, data interpretation, and measurement intervals.


# Data Storage

The amount of historical measurement data stored is directly tied to the measurement interval set on the device:

<table><thead><tr><th>Measurement interval, minutes</th><th>Historic data availability, days</th><th data-hidden></th></tr></thead><tbody><tr><td>1</td><td>6 </td><td></td></tr><tr><td>2</td><td>12</td><td></td></tr><tr><td>5</td><td>30</td><td></td></tr><tr><td>10</td><td>60</td><td></td></tr></tbody></table>

**Memory management**

Altering the measurement interval triggers a restructuring of existing data in the memory system.

For instance, switching from a shorter interval (e.g., 1 minute) to a longer one (e.g., 10 minutes) aggregates ten 1-minute measurements to compute and store an average value. Conversely, adjusting from a longer interval (e.g., 10 minutes) to a shorter one (e.g., 1 minute) generates supplementary data in 1-minute intervals by extrapolating values from 10-minute measurements, creating a sequence of 10-minute "steps" with identical values.

Frequent changes in measurement intervals are discouraged due to the resulting data loss caused by averaging and padding.

If more frequent measurements are required, use the "on-demand measurement" feature for instant measurement.

**Background data download**

The data can be downloaded in the background if the application runs as a background process and "Background data read" is enabled in the app settings.


# Default Settings

The Aranet Radiation sensor is calibrated in the factory, and it works instantly when you take it out of the box and insert the batteries – no additional setup is needed. These are the default settings of the Aranet Radiation sensor:

1. The default measurement interval is set to 5 minutes;
2. The default radiation measurement units are set to Sieverts;
3. Bluetooth connection is enabled;
4. Bluetooth connection transmission range is set to normal;
5. The buzzer for audio sound alarm notifications is disabled;
6. Radiation dose indication is set according to the recommendations 1-4 below.

The 2nd, 3rd and 5th settings can be changed with the switches in the battery compartment on the back of the device, but the remaining settings can only be changed via the Aranet Home phone application.

Scientific recommendations:

1. <https://www.cdc.gov/radiation-emergencies/causes/radiation-thermometer.html?CDC_AAref_Val=https://www.cdc.gov/nceh/radiation/emergencies/radiationthermometer.htm>
2. <https://remap.jrc.ec.europa.eu/Consent/Advanced.aspx>
3. <https://www.bfs.de/EN/bfs/we/we_node.html>
4. <https://www.nea.gov.sg/our-services/radiation-safety/understanding-radiation/health-effects-of-ionising-radiation-on-people>


# Where to Place the Device

For reliable measurements, the **Aranet Radiation sensor** should be placed in a location that represents the area you want to monitor, with minimal shielding or interference. Position the device **in an open area**, ideally **about 1–2 meters (3–6 ft) above ground or floor level**, where it is not blocked by thick walls, metal objects, or dense furniture that could partially absorb radiation. Avoid placing it directly against concrete walls, large appliances, or inside cabinets. Keep the sensor away from strong heat sources, moisture, and direct sunlight.

Place the sensor in your home to enhance family safety or carry it with you for improved health consciousness (IP20 rating). Ideal for frequent travelers, educational enthusiasts and those in close proximity to radiation sources.

The Aranet Radiation sensor should not be placed in direct sunlight or in areas with a risk of splashing the sensor with different liquids, or high-humidity environments (higher than 85%), such as your bathroom. Place the sensor in a safe place where it cannot accidentally be dropped because it isn’t drop-proof.


# Maintenance and Safety

This page explains recommended maintenance procedures, battery handling guidelines, and safety considerations for proper device operation.


# Handling and Cleaning

The Aranet devices are advanced electronic device in a plastic case. You should handle and clean it the same way you deal with other household electronic devices.

#### Handling

* Aranet devices are not impact-resistant; do not drop or hit it.
* Aranet devices are not waterproof; do not use it in high humidity environments (greater than 85%).
* Do not leave Aranet devices in direct sunlight. This can damage the E-ink screen
* Do not expose Aranet devices to strong electromagnetic fields.
* Aranet devices are intended for use at temperatures 0 °C to 50 °C (32 °F to 122 °F). Exposure to lower temperatures can damage the device.

#### Cleaning

You can clean your Aranet device with lukewarm water and mild soap. Mix some soap and water in a bucket, clean the case using a slightly wet soft sponge or microfiber cloth to avoid scratching the material and water drops entering the case. Make sure your detergent has no harsh chemicals that could damage the plastic and sensor, such as white spirits or Clorox.

#### Disinfecting

Alcohol solutions (alcohol / purified water) or wipes with at least 70 per cent alcohol are effective for the sanitization of the Aranet case. First, clean the surface with soap and water as described above. Apply the alcohol solution and let it sit on the surface for at least 30 seconds to disinfect. Wipe dry with a clean cloth.

You can use low-power household UV-disinfectors for Aranet Radiation sensor disinfection, too. Follow the UV-disinfector instructions and do not overexpose the Aranet Radiation sensor to UV radiation.


# FAQ

This page explains common questions and answers related to Aranet Radiation functionality, configuration, and troubleshooting.

<details>

<summary>Why should I detect ionizing radiation?</summary>

Detecting ionizing radiation is crucial for ensuring safety and health in environments where radiation levels may pose a risk. Ionizing radiation can damage living tissue and increase the risk of cancer, particularly with prolonged exposure. By monitoring ionizing radiation, you can identify and mitigate potential hazards in your home or workplace, adhere to safety guidelines, and maintain a healthy living environment.

</details>

<details>

<summary>What types of ionizing radiation can Aranet Radiation sensor detect?</summary>

Aranet Radiation sensor can detect γ (gamma), β (beta), and X-rays. However, it is designed to measure γ (gamma) radiation levels with high accuracy, thanks to its calibration using a Cs-137 radiation source. While it can detect β (beta) radiation and X-rays, it is not calibrated to provide precise quantitative measurements for these types.

</details>

<details>

<summary>How does Aranet Radiation sensor alert me to unhealthy radiation levels?</summary>

The sensor features both visual and audible alarm systems that activate when radiation levels exceed scientifically guided safe limits. These alarms are designed to promptly notify you of any environmental safety concerns.

</details>

<details>

<summary>Is Aranet Radiation sensor suitable for outdoor use?</summary>

While the sensor is portable and can be used in various environments, direct sunlight and high humidity (e.g. rainy days) should be avoided. Sun exposure can negatively affect the E-Ink display.

</details>

<details>

<summary>What should I do when reaching the dose accumulation time limit?</summary>

Upon reaching the limit, the device will update the total dose reading but stop increasing the accumulation time. You should reset the total dose reading using the button on the back of the device or through Aranet Home mobile app before reaching this limit to ensure continuous monitoring.

</details>

<details>

<summary>Can I turn off the audible ionizing radiation detection buzzer?</summary>

Yes, the instant audible ionizing radiation detection (auditory pulse counter) feature comes with a buzzer that can be easily switched off (2nd switch behind the batteries) if you prefer not to have audible alerts.

</details>

<details>

<summary>How does Aranet Home app enhance the use of Aranet Radiation sensor?</summary>

The Aranet Home app allows you to view 90-day historical data, helping you notice and analyze patterns in radiation levels. It also enables you to adjust device settings, including measurement intervals and alarm thresholds, for personalized monitoring.

</details>

<details>

<summary>How to export measurement data from Aranet Home App?</summary>

Simply go into your Aranet Home App, and tap onto the dashboard view in the top right corner. Once there, tap on the “Sharing” icon in the top right corner and choose how you would like to share or download it.

</details>

<details>

<summary>Do I need to register to use the device?</summary>

No registration is necessary. You can use Aranet Radiation sensor as a standalone device or sync it with the free Aranet Home app for a comprehensive data history and analysis.

</details>

<details>

<summary>Does it work without cables or Wi-Fi?</summary>

Yes. It’s battery-powered and cable-free. Bluetooth is optional and used only if you connect it to the Aranet Home app.

</details>

<details>

<summary>How can I extend the warranty on my Aranet Home products?</summary>

You can extend the warranty of your Aranet Home products by an additional 12 months by registering the product and agreeing to receive email updates from SAF Tehnika. You can withdraw your consent to receive emails anytime without affecting the extended warranty.

[Register your product](https://aranet.com/en/home/register-product)<br>

</details>

<details>

<summary>How can I return my Aranet sensor?</summary>

If you’re facing issues with your product, please fill in the returns form.

[Return form](https://rma.aranet.com/)

</details>


# Aranet2 Home

The **Aranet2** is a portable indoor device that measures temperature and relative humidity, displaying real-time readings on a clear E-Ink screen to help maintain comfortable conditions. Battery-powered and long-lasting, it is suitable for spaces like bedrooms, closets, and storage areas, and can be paired with the Aranet Home app to track and review environmental data over time.

{% columns %}
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{% content-ref url="/pages/Iihg1cgAUBjqxKJe3KGe" %}
[General](/aranet2/aranet2-home/general)
{% endcontent-ref %}
{% endcolumn %}

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{% content-ref url="/pages/Wm0REAB2hjIyjzOxxEFb" %}
[Documents and Firmware](/aranet2/aranet2-home/documents-and-firmware)
{% endcontent-ref %}
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column %}
{% content-ref url="/pages/sE6VmbxTAMxygymxPdcG" %}
[Usage and Measurements](/aranet2/aranet2-home/usage-and-measurements)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
{% content-ref url="/pages/CQcIMRhyBFMae2DNOjm9" %}
[Maintenance & Safety](/aranet2/aranet2-home/maintenance-and-safety)
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{% columns %}
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{% content-ref url="/pages/62EfKGZCvYIpaZScvxtA" %}
[FAQ](/aranet2/aranet2-home/faq)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
{% content-ref url="/pages/Vt7Yo7VS1klxHYlnvkT2" %}
[Quick Start Guide](/aranet2/aranet2-home/quick-start-guide)
{% endcontent-ref %}
{% endcolumn %}
{% endcolumns %}


# General

This page explains the main features and functionality of the Aranet2 device, including its measurements, display indicators, and basic operating principles.


# About Aranet2

The **Aranet2** is a compact wireless sensor designed to monitor **temperature and relative humidity** in indoor environments. It continuously measures these conditions and transmits the data to the Aranet Home app or a compatible Aranet base station, allowing you to track changes over time and receive alerts when values move outside your preferred range. With long battery life and flexible placement options, the Aranet2 is a well-suited sensor for managing storage conditions or environmental stability in homes, offices, and other indoor spaces.

#### Temperature and Relative Humidity (T/RH)

Temperature and humidity are measured using a **precision digital sensor** that includes a tiny thermistor and a capacitive humidity element. The thermistor changes its electrical resistance with temperature, while the humidity element changes capacitance based on moisture in the air. The sensor converts these physical changes into digital readings, giving accurate T/RH measurements with minimal drift

#### Screen indications

Besides the measurements, the Aranet2 screen can show these indications:

| Indication              | Meaning                                                                         |
| ----------------------- | ------------------------------------------------------------------------------- |
| Six-digit PIN code      | The device is ready to pair. Enter this code in the Aranet Home app.            |
| Do not remove batteries | A firmware update is running. Do not remove the batteries until it is finished. |
| Empty batteries         | The batteries are empty. Replace them.                                          |


# Device Lifespan

The battery life of the two AA batteries that the device uses is dependent on some conditions. See the table below:

| Measurement interval | Alkaline batteries, Bluetooth Off | Alkaline batteries, Bluetooth On | Lithium batteries, Bluetooth Off | Lithium batteries, Bluetooth On |
| -------------------- | --------------------------------- | -------------------------------- | -------------------------------- | ------------------------------- |
| 1 min                | 1.2 years                         | 1.1 years                        | 1.6 years                        | 1.4 years                       |
| 2 min                | 2.2 years                         | 1.8 years                        | 3.0 years                        | 2.4 years                       |
| 5 min                | 4.3 years                         | 3.2 years                        | 6.0 years                        | 4.3 years                       |
| 10 min               | 7.3 years                         | 4.2 years                        | >10 years                        | 5.8 years                       |

#### Waste of electronics

Waste batteries and electronic equipment must be taken to household hazardous waste collection points! You may search the internet for the closest collection point in the area you are located.

**Never** put these items in household garbage or recycling bins!

**Do not expose** the batteries to fire! Do not dismantle them!

Waste of batteries and electronic equipment can contain substances and materials that can harm the environment and living beings, if treated as regular household waste.


# Power Options

The Aranet2 can run either on standard AA batteries or via a dedicated AC power adapter. Out-of-the-box it uses **two AA batteries**, which — thanks to its power-efficient e-ink display and smart power management — can last for a few years and potentially much longer if data updates are infrequent. For installations where you prefer continuous monitoring without battery maintenance, an **optional AC adapter** can be used to keep the device powered indefinitely.  Although it is for Aranet4 it also works with the Aranet2\
The power adapter can be found here:​<https://aranet.com/en/pro/products/aranet4-ac-power-adapter>![](https://images.gitbook.com/__img/dpr=2,width=760,onerror=redirect,format=auto,signature=647613471/https%3A%2F%2Ffiles.gitbook.com%2Fv0%2Fb%2Fgitbook-x-prod.appspot.com%2Fo%2Fspaces%252FsryVHhsQqwlIEVjGZzRx%252Fuploads%252FXSIrtfxCB5qDtkmyEJsc%252Fimage.png%3Falt%3Dmedia%26token%3D1971331b-92f9-46cf-af03-b9e2fe41a152)

<figure><img src="https://1419788306-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FWkQjwPV9Yi8oex9gapPt%2Fuploads%2FXxlKsDwaktYDvFq4kniI%2Fimage.png?alt=media&amp;token=f084bd2b-0cd2-4d32-9bd8-7e35fa545bbf" alt=""><figcaption></figcaption></figure>


# Documents and Firmware

This page explains how to access product documentation, download firmware updates, and maintain the latest device software version.


# Documents

**User guide**:

[Aranet2 Sensor User Guide / Manual](https://aranet.com/downloads/aranet2-home-user-manual)

**Datasheet:**

[Aranet2 Sensor Datasheet](https://aranet.com/downloads/aranet2-home-datasheet)

**Quick Start Guide:**

[Aranet2 Sensor Quick Start Guide](https://aranet.com/downloads/aranet2-home-quick-start-guide)


# Firmware Changelog

Aranet2 Home

v1.5.44

* Improved display driver stability.
* Improved GUI: added sensor ID on screen.

v1.4.19

* Improved battery life.
* Improved new battery detection in low battery state.

v1.4.6 - Initial Firmware version


# How to Update Firmware

Starting with Aranet Home app version v2.0, a firmware update can be done as follows:

{% columns %}
{% column valign="middle" %}
Locate the sensor you need to perform the update on. Then click on the three-dot icon and find *Device Settings.*

Scroll down and find the *Firmware Update* option and press it.

In the next window, if there is an update, you will be able to perform one. If not, then a message *Up to date* will be displayed.
{% endcolumn %}

{% column %}

<div data-with-frame="true"><figure><img src="https://1419788306-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FWkQjwPV9Yi8oex9gapPt%2Fuploads%2FDYHmpPVSqM2QZHwQtczx%2Ffirmware-update.gif?alt=media" alt="" width="135"><figcaption></figcaption></figure></div>
{% endcolumn %}
{% endcolumns %}

{% hint style="info" %}
Sometimes there might be an issue where the sensor is stuck during some operation, for example, a firmware upgrade.
{% endhint %}

If you are stuck in the update process, it is advised to open the Aranet Home app and try to add a new sensor. In most cases, this sensor will be discovered, paired back to the app, and working again. If the issue still persists, please contact <support@aranet.com> or refer to the information in another topic: [Stuck in Firmware Upgrade Mode](/aranet2/aranet2-home/documents-and-firmware/stuck-in-firmware-upgrade-mode)


# Stuck in Firmware Upgrade Mode

If your Aranet device gets stuck in a firmware update, then follow these steps:

{% hint style="warning" %}
This only works from the Aranet Home app v3.4.2. As such, you should update your app before trying this.
{% endhint %}

{% hint style="warning" %}
Removing the batteries erases the measurement history stored on the device. If the sensor is still connected, open the Aranet Home app and let it sync first, so the history is kept in the app.
{% endhint %}

1. Remove batteries and place them back after a few minutes.
2. Do “PAIR NEW DEVICE” from the application settings menu – the app will find the failed Aranet2 device and will start firmware recovery

<div data-with-frame="true"><figure><img src="https://1419788306-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FWkQjwPV9Yi8oex9gapPt%2Fuploads%2FrFN6wmFFfnkn4zgqQ0GN%2Ffirmware-recovery.png?alt=media" alt=""><figcaption></figcaption></figure></div>




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