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

DPV40 Pivot Stem (Voltage) Dendrometer

The DPV40 Pivot Stem (Voltage) Dendrometer is used to measure stem circumference changes over 5-40mm. The linear output, in milivolts, can be converted to a raw stem circumference over the measurement range.

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.
  • Pivot-based sensing
  • Linear mV output
  • Step-less reading
  • Easy and fast non-invasive fixing
  • Good thermal properties prevent a temperature effect on measurement

The DPV40 features voltage output for compatibility with a range of data logging solutions.

The DPV40 is also available with SDI-12 output (DPS40).

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