dendrometers for trees

Tree DiameterThe DE-1M Dendrometer is a highly precise incremental LVDT-based sensor for monitoring micro-variations of trunk radius in micron range.

The DE-1M is ideal for correlating tree trunk or stem diameter variations against environmental variables, or tree water use of water potential, for a complete and comprehensive analysis of tree physiology.

Edaphic Scientific supplies the DE-1M complete with pre-programmed data loggers for a quick and easy installation. Alternatively, we can assist you in connecting the DE-1M to your own, existing data logging system.


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LVDT Tree DendrometerPlant growth and water balance affect diurnal behaviour of trunk radius. The growth rate depends on a vegetation stage and environmental conditions. The diurnal variations represent mostly fluctuations of water content in plants. Two radius-based indices are commonly used for evaluating plant water status: daily contraction amplitude and trend of daily maxima. The DE-1 Dendrometer allows investigating effects of irrigation rate and other environmental factors on water balance and growth of plants.

The DE-1M Dendrometer includes a linear displacement transducer (LVDT) mounted on a special rod with threaded end. When the rod is anchored inside the trunk, the LVDT represents the movement of trunk surface. Thus, the output signal follows variations of distance between trunk surface and the end of the rod, which is anchored inside the trunk.

A signal conditioner provides excitation of the LVDT and production of standard linear output signal.

The probe is connected by a standard 1-meter cable to the waterproof box with the signal conditioner inside.

The output cable length should be specified in the order if required.


feature specification
Measurement Range 0 to 10 mm
Trunk Diameter Range > 6 cm diameter
Sensitivity 0.2 V / mm
Noise < 1 mV w/filter, 1 kHz cutoff
Resolution 0.005 mm
Output SDI-12, RS-485, Voltage or 4..20mA
Supply Voltage 10 to 30 VDC
Power DE-1M: 1.5 W max | DE-1Mi: 2 W max
Operating Temperature 0 to 50 ℃
Temperature Effect < 0.02 % total stroke / ℃
Excitation Time 5 seconds
Overall Physical Dimensions 90 W × 60 H × 23 D mm
Carrying Rod Dimensions 160 L × 4 ∅ mm
Threaded End Dimensions 10 L × 5 ∅ mm
Cable length between probe and signal conditioner 1 m
Cable length between signal conditioner and data logger 5 m (standard) | maximum: 10 m for voltage sensors; 200 m for 4 .. 20 mA sensors




Download DE-1M Dendrometer Manual


additional information

Dendrometers: multi-purpose sensors