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DE-1M Dendrometer

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Plant growth and water balance affect diurnal behaviour of trunk diameter. The growth rate depends on a vegetation stage and environmental conditions. The diurnal variations represent mostly fluctuations of water content in plants. Two diameter-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 is a highly precise incremental LVDT-based sensor for monitoring micro-variations of trunk diameter in micron range.

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. Standard cable length between sensor and signal conditioner is 1 metre.

SPECIFICATIONS
Measurement range: 0 to 10 mm
Trunk diameter range: Above 6 cm
Sensitivity: 0.2 V/mm
Noise: < 1 mV w/filter, 1 kHz cut off
Resolution: 0.005 mm (w/filter)
Supply voltage: 10 to 30 VDC @ 1 W max
Operating temperature: 5 to 50 ℃
Temperature effect: < 0.02% total stroke / ℃
Excitation time: 5 s

Output
Standard: 0 to 2 VDC, linear
Optional: 4 to 20 or 0 to 20 mA

Dimensions (mm)
Sensor: 90 W × 60 H × 23 D
Carrying rod: 160 L × 4 ∅
Head: 10 L × 5 ∅

Ordering Information (Specify Output and Cable Length):
IS032011P DE-1M Dendrometer