T/RH sensors
Topic refers to all T/RH sensors
Modern environmental monitoring requires more than simple temperature readings. In agriculture, greenhouses, warehouses, industrial facilities, and outdoor installations, precise temperature and relative humidity measurements are critical for maintaining product quality, operational efficiency, and environmental stability.
Non-aspirated sensors are significantly simpler to deploy in greenhouse environments because they do not require mains power. However, their performance depends strongly on the design of the sensor housing and radiation shield, both outdoors and in greenhouses. Aranet provides non-aspirated T/RH sensors only.
There are different environments in which these sensors can be used, but each one of them has its own favourite environment to operate within.
Sensors
Product Code: TDSPT1*1
The Aranet T/RH Mini Sensor is a compact wireless device that accurately measures temperature and relative humidity. Ideal for offices, living areas, or any indoor environment where robust water or dust protection isn’t essential, this sensor combines precision performance with discreet design.
Suitable environment:
Discreet and Accurate Climate Sensing
The Aranet T/RH Mini Sensor is designed for effortless deployment in indoor environments where size, ease of use, and long-term performance matter. From workplace comfort to facility monitoring, it provides accurate environmental insights without complexity.
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Product Code: TDSPT2*4
Aranet T Compact sensor provides real-time temperature readings that are critical for businesses like supermarkets and warehouses with cold storage. Temperature monitoring can prevent product decay and losses that could thus occur.
The measurement range is from -40°C to +60°C. The sensor is protected against dust ingress and long periods of immersion in water, IP 68.
Suitable environment:
Precise Temperature Measurements
Designed according to Food and Drug Administration requirements, the sensor safely tracks temperature in refrigerators and freezers. Ensure temperatures remain within the preferred range in server rooms, and maintain optimal temperatures in warehouses and other industrial settings for a comfortable and safe environment.
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Product Code: TDSPT8*9
The Aranet T/RH Probe Heavy Duty is a wireless sensor with an external probe, engineered for environments where durability and measurement accuracy are non-negotiable. The PTFE probe and silicone cable ensure reliable temperature and humidity monitoring in condensing and tough industrial settings.
Suitable environment:
Reliable sensing built for extreme environments
The Aranet T/RH Probe Heavy Duty is engineered for precision temperature and humidity monitoring in the most challenging conditions — from greenhouses and cold storage to demanding industrial spaces. With a rugged external probe, high ingress protection, and flexible installation options, it ensures long-term data reliability where standard sensors can’t perform.
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Product Code: TDSPT8*2
The IP67 protection allows this device to operate in harsh environmental conditions, like greenhouses, warehouses, freezers, and livestock farms. The sensor is wireless, battery-powered, and ensures constant and reliable data monitoring.
Suitable environment:
Precision in harsh environments
Use the sensor in greenhouses to identify cold spots and ventilation issues for better climate management. It also helps maintain optimal conditions in warehouses and manufacturing facilities, ensuring a safe and comfortable environment.
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Product Code: TDSPT5*9
Aranet T/RH sensor with Radiation Shield is an innovative solution for accurate temperature and humidity measurements in greenhouses exposed to direct sunlight. Its innovative design creates a passive ventilation flow to prevent sensor heating and ensure precise readings, making it a vital tool for greenhouse ambient condition monitoring.
Suitable environment:
Precision in Greenhouse Conditions
Sensor design effectively prevents the sensor element from overheating when exposed to sunlight, all without requiring an electric ventilator to generate airflow.
Measure temperature, relative humidity, calculate the dew point, and determine the Vapor Pressure Deficit (VPD). Detect cold spots and uneven ventilation issues for precise greenhouse temperature management.
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Product Code: TDSPT8*2.ORS
The T/RH IP67 sensor is designed for harsh outdoor environments where durability and weather resistance are essential. It continuously measures environmental temperature and humidity while maintaining stable performance under dust, rain, moisture, and changing outdoor conditions.
The IP67 protection allows this device to operate in harsh environmental conditions, and the Outdoor Radiation Shield prevents false readings and improves the accuracy of the measurements in the outdoor environment. The sensor is wireless, battery-powered, and ensures constant and reliable data monitoring.
Suitable environment:
Outdoor environment, with harsh conditions. Due to IP67 protection, the sensor can withstand rain, dusty industrial areas, agricultural environments, outdoor storage facilities, and high-moisture environments.
Without strong enclosure protection, moisture or dust contamination can damage sensing elements and reduce measurement accuracy over time.
Importance of the Outdoor Radiation Shield
One of the most meaningful features is the outdoor radiation shield.
What It Does
The shield protects the sensor from:
Direct sunlight
Thermal radiation
Heat reflection from nearby surfaces
Why This Matters
Without a radiation shield:
The sensor body can heat up from the sunlight
The measured temperature becomes artificially higher
Humidity calculations become inaccurate
The radiation shield allows air to circulate naturally while blocking direct solar heating, resulting in more accurate environmental readings. This is especially important for:
Greenhouses
Weather stations
Outdoor agriculture
Climate research
Environmental compliance monitoring
Product Code: TDSPT8*9.ORS
The T/RH Probe Heavy Duty version is built for more demanding professional applications where the sensing probe must be physically separated from the transmitter body.
Aranet T/RH Probe Heavy Duty with Outdoor Radiation Shield is a wireless sensor with an external probe, engineered for environments where durability and measurement accuracy are non-negotiable. The PTFE probe and silicone cable ensure reliable temperature and humidity monitoring in condensing and tough industrial settings. The Outdoor Radiation Shield prevents false readings and improves the accuracy of the measurements in the outdoor environment.
Suitable environment:
Outdoor environment, with harsh conditions.
Without strong enclosure protection, moisture or dust contamination can damage sensing elements and reduce measurement accuracy over time.
Importance of the Outdoor Radiation Shield
One of the most meaningful features is the outdoor radiation shield.
What It Does
The shield protects the sensor from:
Direct sunlight
Thermal radiation
Heat reflection from nearby surfaces
Why This Matters
Without a radiation shield:
The sensor body can heat up from the sunlight
The measured temperature becomes artificially higher
Humidity calculations become inaccurate
The radiation shield allows air to circulate naturally while blocking direct solar heating, resulting in more accurate environmental readings. This is especially important for:
Greenhouses
Weather stations
Outdoor agriculture
Climate research
Environmental compliance monitoring
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The external probe offers several advantages:
Better placement flexibility, which allows the probe to be installed:
Inside ventilation ducts
Near crops
Inside machinery
In hard-to-reach areas
In enclosed monitoring points
While keeping the main transmitter protected elsewhere.
Improved Measurement Accuracy
Separating the sensing element from electronics reduces:
Self-heating effects
Heat interference from equipment
Environmental bias
This improves measurement stability in industrial conditions.
Heavy-Duty Applications
The sensor is intended for:
Industrial HVAC systems
Food storage facilities
Manufacturing environments
Smart agriculture
Harsh outdoor deployments
Why is relative humidity monitoring necessary?
Humidity is often underestimated, yet it strongly affects:
Plant diseases
Mold growth
Corrosion
Product spoilage
Human comfort
Electronics reliability
For example:
High humidity can damage stored goods
Low humidity may affect industrial processes
Greenhouses require precise humidity balancing for optimal crop growth
The ±2% RH accuracy of these sensors helps maintain stable environmental conditions with professional-grade precision.
Choosing the right sensor
It is very important to choose wisely and precisely, so the sensor can withstand the environment in which it will be placed. Please make sure that operational temperatures and IP standards meet your needs, as these are the marks where it is possible to make mistakes and order an incorrect sensor that is not suited for the environment in which it will be used.
Which T/RH sensor should be used outdoors?
As shown in the results, many sensors experience solar heating and report elevated temperatures when exposed to direct sunlight. Assuming that the lowest measured temperature is closest to the true ambient value, the differences between sensor designs become evident.
This image displays which sensors are not meant for outdoor use.
All radiation-shielded sensors perform better because airflow around the sensing element provides additional cooling and reduces the influence of solar radiation. The outdoor radiation shields perform best, as their reflective design minimizes solar heating while allowing wind to effectively cool the sensor.
The T/RH IP67 sensor shows slightly higher temperatures than the T/RH Probe. This is primarily due to the lower thermal mass (thermal inertia) of the probe sensor, which enables faster cooling and a quicker response to changing environmental conditions.
Which T/RH sensor should be used in a greenhouse?
This greenhouse setup was designed to demonstrate how different radiation shields perform under greenhouse conditions. Greenhouses typically have low air movement but strong solar radiation. While solar radiation levels outdoors may be similar, outdoor environments generally provide significantly higher airflow.
The T/RH Radiation Shield sensor is specifically designed to create a chimney effect in greenhouse environments. Natural convection promotes airflow through the shield, reducing heating of the sensing element. As a result, the sensor responds quickly and should provide measurements that are very close to the true air temperature.
In contrast, outdoor radiation shields are optimized for wind-assisted ventilation. In greenhouse conditions, where airflow is limited, these shields are less effective at cooling the sensor and may exhibit greater solar heating.
When the same setup is moved outdoors, measured temperatures decrease because the outdoor air temperature is lower. For the T/RH Radiation Shield sensor, wind disrupts the chimney effect, reducing its cooling efficiency. Outdoor radiation shields, however, are specifically designed to utilize ambient airflow and therefore provide stable measurements under outdoor conditions.
Once again, the T/RH Probe responds faster to changing conditions than the T/RH IP67 sensor due to its lower thermal inertia.
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