Stem Micro-Variation Sensors
Plant growth and water balance affect diurnal behavior 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.
SD-type sensor is a highly precise incremental LVDT-based sensor for monitoring micro-variations of stem diameter in micron range.
The SD-type sensor consists of an LVDT probe mounted in special fixing brackets and a DC powered signal conditioner. Standard cable length between sensor and signal conditioner is 1 meter.
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.
SD-5M SD-6M Specifications
Measurement range 0 to 5 mm
Stem diameter range, mm 5 to 25; 20 to 70
Sensitivity 0.4 V/mm (3.2 mA/mm or 4 mA/mm)
Output Standard 0 to 2 VDC, linear
Optional 4 to 20 or 0 to 20 mA
Supply voltage 10 to 30 VDC @ 1 W max
Excitation time 5 s
Noise < 1 mV w/filter, 1 kHz cutoff
Resolution 0.002 mm (w/filter)
Operating temperature 5 to 50 ℃
Temperature effect < 0.02% total stroke/℃
Ordering Information (Specify Output and Cable Length)
IS031011P SD-5P Stem Diameter (5 to 25 mm)
IS033011P SD-6P Stem Diameter (30 to 70 mm)
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