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.
Specifications:
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
Measurement:
Type: Volumetric water content (VWC)
Range: 0-50% VWC typical
Resolution: Depends on current measurement (data acquisition) device
Accuracy:
± 4 % VWC with factory mineral soil calibration in a typical mineral soil
± 1-2% VWC with medium-specific calibration in most porous medium
