> For the complete documentation index, see [llms.txt](https://help.aranet.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.aranet.com/pro-series-sensors/pro-series-sensors/stem-micro-variation-sensor-setup.md).

# Stem Micro-Variation Sensor Setup

This sensor measures micro-variations in the plant
 stem diameter for horticulture or other applications.

<details>

<summary>Functions</summary>

When attached to the stem of a plant, this sensor:

* Measures changes to the plant's stem diameter with μm precision.
* Detects plant behavior in response to growth factors.
* Optimizes ventilation, light screening, and irrigation.

</details>

#### Usage of the stem diameter sensor

Attach the diameter sensor to the top and the base of the plant to determine factors related to
\
growth. Use this data alongside other indicators to optimize growing conditions.

<div data-with-frame="true"><figure><img src="/files/MPZ6io3J65eTEq1vkbAY" alt=""><figcaption></figcaption></figure></div>

#### Full automation routine

Using Aranet Stem diameter sensors and a climate computer optimizes water irrigation, ventilation, and light screening:

1. The Stem diameter sensor network measures the stem size.
2. The base station collects the measured data.
3. Access data from the base station locally or from the Aranet cloud.
4. Evaluate the diameter size data and let the climate computer adjust irrigation, ventilation, and light conditions.

#### Setting up the stem diameter sensor

{% stepper %}
{% step %}

#### Attach the diameter sensor

You will need to attach the diameter sensor to the top or base of the plant to monitor growth-related factors.

<div data-with-frame="true"><figure><img src="/files/tXwYKwFMXwkcaKle5F32" alt=""><figcaption></figcaption></figure></div>
{% endstep %}

{% step %}

#### Select an appropriate stem for sensor installation.

{% endstep %}

{% step %}

#### Rotate the adjusting nut to move the bearing jaw away from the LVDT transducer

{% endstep %}

{% step %}

#### Position the stem between the sensor’s jaws.

{% endstep %}

{% step %}

#### Rotate the adjusting nut back until both jaws gently contact the stem.

Continue rotating the adjusting nut until the rod reaches the desired position. If the stem is expected to grow, position the rod near the beginning of its stroke. If it is expected to shrink, position it near the end. Otherwise, place it
\
somewhere in the middle.
{% endstep %}

{% step %}

#### Secure the sensor cable to the stem to prevent unintentional movement.

{% endstep %}

{% step %}

#### Readjust the sensor when its readings approach 0 mm or 5 mm.

<div data-with-frame="true"><figure><img src="/files/T1DOtRsrNP7FDpmglj6y" alt="" width="239"><figcaption></figcaption></figure></div>
{% endstep %}

{% step %}

#### Pair the Aranet transmitter.

For more details on the pairing process, consult the Aranet product TDSCT1\*2 data sheet. After
&#x20;pairing 4–20 mA transmitters with a 12 VDC PSU included in this kit, configure the conversion from analog 4–20 mA to
&#x20;stem diameter values. Open the sensor settings menu in the Aranet base station’s web interface, update its name, and enable the conversion feature. Select Diameter as a Metric and mm or in as a unit, and define the minimum and
\
maximum measurement values as detailed below.
{% endstep %}
{% endstepper %}


---

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