dendrometers for small stems

LVDT DendrometerMeasure and monitor micro-variations and growth in small or herbaceous stems.

SD-type dendrometer sensors are a highly precise incremental LVDT-based sensor for monitoring micro-variations of stem diameter in micron range.


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DendrometerPlant growth and water balance affect diurnal behaviour of stem 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 SD-type sensor allows investigating effects of irrigation rate and other environmental factors on water balance and growth of plants.

The SD-type sensor consists of an LVDT probe mounted in special fixing brackets and a DC powered signal conditioner.

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.

SD-5M and SD-6M models have different fixing brackets for the same 5 mm LVDT probe. The SD-5M bracket fits stems with 5 to 25 mm in diameter. The SD-6M bracket is suitable for 20 to 70 mm stems.


feature specification
Measurement Range 0 to 5 mm
Stem Diameter Range (mm) SD-5M: 5 to 25 | SD-6M: 20 to 70
Sensitivity 0.4 V / mm
Noise < 1 mV w/filter, 1 kHz cutoff
Resolution 0.002 mm
Output SDI-12, RS-485, Voltage or 4..20mA
Supply Voltage 10 to 30 VDC
Power SD-5/6M: 1.5 W max | SD-5/6Mi: 2 W max
Operating Temperature 0 to 50 ℃
Temperature Effect < 0.02 % total stroke / ℃
Excitation Time 5 seconds
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 SD-5m SD-6M Dendrometer Manual