Soil Moisture Sensor (SMS-BTA)
Specifications and User Guide
-Primary Test: In air, the Soil Moisture Sensor should read somewhere between -5% and -50%. Grab the sensing portion with your hand, and the reading should go up to somewhere between 10% and 50%.
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-Order code: SMS-BTA
-Range: 0 to 45% volumetric water content
-Accuracy: +/-4% typical
-Resolution: 0.05% (SensorDAQ), 0.1% (LabPro, LabQuest – all versions, Go! Link, or EasyLink); 0.4% (CBL 2)
-Calibration: Slope = 108%/volt; Y-intercept = -42%
-Power: 3 mA @ 5 VDC
-Operating temperature: -40 °C to +60 ºC
-Dimensions: 8.9 cm x 1.8 cm x 0.7 cm (active sensor length 5 cm)
-Calibrate? Usually, no. Possible exceptions: you are testing soil with high concentrations of salt, sand, or organic matter; very precise readings are required.
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