DE-1M Dendrometer on trunk
DE-1M Dendrometer

DE-1M Dendrometer

Overview

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

Plant growth and water balance affect diurnal behavior 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.

Specifications

Measurement range0 to 10 mm
Trunk diameter rangeAbove 6 cm
Sensitivity0.2 V/mm
Noise< 1 mV w/filter, 1 kHz cutoff
Resolution0.005 mm (w/filter)
Output
DE-1M0 to 2 VDC, linear
DE-1Mi4 to 20 mA
Supply voltage10 to 30 VDC
Power
DE-1M1.5 W max
DE-1Mi2 W max
Operating temperature0 to 50 ℃
Temperature effect< 0.02% total stroke / ℃
Excitation time5 s
Overall dimensions of the sensor, mm90 W × 60 H × 23 D
Carrying rod, mm160 L × 4 ∅
Threaded end, mm10 L × 5 ∅
Cable length between probe and signal conditioner1  m

See also: