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Enabling better global research outcomes in soil, plant & environmental monitoring.

DPS40 Pivot Stem (SDI-12) Dendrometer

The DPS40 Pivot Stem Dendrometer is a pivot-based sensor for measurement of small stems, from 5mm to 40mm.

The DPS40 SDI-12 Pivot Stem Dendrometer is designed for the measurement of the diameter of small stems or branches between 5mm and 40mm. Sensor output is calibrated directly in millimetres of stem diameter.

The sensor is designed with respect to easy and fast installation. It is fastened on the measured object by three pressure levers; the central jib turns the rotary position sensor proportionally to the object diameter. Adherence pressure is set as a compromise between the influence on plant tissues and installation stability. The bearing of the position sensor is carefully shaped for minimal effect of temperature and axial forces.

Each sensor is individually calibrated in 100 points over the whole range for excellent sensor linearity.

  • Pivot-based sensing
  • Sensors are individually calibrated in mm of diameter
  • Step-less reading
  • Easy and fast non-invasive fixing
  • Good thermal properties prevent a temperature effect on measurement
  • SDI-12 or Voltage output options
  • SDI-12 output is individually calibrated to 100 points for excellent linearity

SDI-12 output is ideal for use with the ICT International SDI-12 Logger or the S-NODE.


Utilising the DPS40 Pivot Stem Dendrometer sensor in a custom IoT (Internet of Things) package

The SNiP-DPS is a ‘Sensor Node Integrated Package’ for LoRaWAN or CAT-M1 communication of real-time plant diameter measurements for continuous plant monitoring.

The base SNiP-DPS integrates a S-NODE and 1 DPS40 Pivot Stem Dendrometer to a site’s unique network, communication and power requirements. The S-NODE can support an added 3x DPS40 Pivot Stem Dendrometer devices.

The DPS40 features SDI-12 output for compatibility with a range of data logging solutions.

The DPS40 is also available with voltage output (DPV40).

Installation notes:
Sensor has to be placed on a relatively straight and regularly shaped stem (or branch) such that the plastic cover of the electronics does not touch the measured object. The cable has to be fastened to the stem in order to avoid its influence on the sensor position. The label on the black plate on the jib must be visible – it must point outwards of the stem.


Measurement Range: 5 to 40mm Diameter
Accuracy: > 0.5mm
Linearity: ± 0.5% of full scale
Resolution: 1.24 µm
Input Voltage: 5 to 12V DC
Current Consumption (Idle): 20 µA
Current Consumption (During Measurement): 6 mA
Tightening Strength: 1.5 to 2N lateral levers, 2 to 3N central sensing jib
Temperature Measurement Accuracy: ±0.2°C
Operating Environment: -40 to 60°C
Warm-up Time: 300 ms
Connection: Three wire Escha M8 connector (male)
Mass: 150g
Protection: IP67
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