Model SD-5P & SD-6P - Stem Micro-Variation Sensors
From Plant Sensors
SD-type sensor is a highly precise incremental LVDT-based sensor for monitoring micro-variations of stem diameter in micron range. 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.
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Product Details
- 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.
- Standard output cable length between signal conditioner and monitor is 4 meters.
- SD-5P and SD-6P models have different fixing brackets for the same 5 mm LVDT probe. The SD-5P bracket fits stems with 5 to 25 mm in diameter. The SD-6P bracket is suitable for 20 to 70 mm stems.
Technical Specifications
- Measurement range 0 to 5 mm
- Stem diameter range, mm 5 to 25 20 to 70
- Resolution 0.002 mm (w/filter)
- Operating temperature 0 to 50 ℃
- Temperature effect < 0.02% total stroke/℃
- Signal conditioner Protection index IP 64
- Cable length between probe and signal conditioner 1 m
- Output cable length 4 m
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