Bio Instruments S.R.L.

Model DE-1P - Dendrometer

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The DE-1P 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-1P 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.

Standard output cable length between signal conditioner and monitor is 4 meters.

Measurement range 0 to 10 mm
Trunk diameter range Above 6 cm
Resolution 0.005 mm (w/filter)
Operating temperature 0 to 50 ℃
Temperature effect < 0.02% total stroke / ℃
Signal conditioner protection index IP 64
Overall dimensions of the sensor, mm 90 W × 60 H × 23 D
Carrying rod, mm 160 L × 4 ∅
Threaded end, mm 10 L × 5 ∅
Cable length between probe and signal conditioner 1  m
Output cable length 4  m

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