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