Soil Moisture Sensor

  • Soil Moisture Sensor
  • Soil Moisture Sensor

These innovative sensors will enable you to monitor soil moisture accurately and affordably with a standard 2-wire, 4-20 mA analog interface for use with many data acquisition and control systems.


Electrical Interface : Standard 4-20 mA, 2-wire analog transmitter
Supply voltage : 10-32 VDC continuous
Output current : 4-20 mA
Overvoltage protection : Yes
Reverse polarity protection : Yes
Settling time : 4 seconds
Wiring: Red wire : (+) supply
Black wire : (-) output
Shield : Not connected


Type : Volumetric water content (VWC)
Range : 0-50% VWC typical
Resolution : Depends on current measurement (data acquisition) device


  • ± 4 % VWC with factory mineral soil calibration in a typical mineral soil;
  • ± 1-2% VWC with medium-specific calibration in most porous medium.

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