Updated:2023-02-16
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The MAS-1 4-20 milliamp soil moisture sensor is the first current-based sensor to use METER’s trademark 70 MHz technology. This sensor offers a standard 4-20 milliamp output that is common with PLCs and irrigation controllers. With the 4-20 mA interface, cable lengths over 250 feet are possible.
The MAS-1 soil moisture sensor determines volumetric water content (VWC ) by measuring the dielectric constant of the media using capacitance/frequency domain technology. The sensor uses a 70 MHz frequency, which minimizes salinity and textural effects, making the MAS-1 accurate in almost any soil or soil-less media. Factory calibrations are included for mineral soils, potting soils, and rockwool.
The MAS-1 delivers research-grade soil moisture accuracy at a price that makes large sensor networks economically practical. You can adequately characterize your site with sensors at multiple depths and locations, even if you’re on a tight budget.
Interface: | Standard4-20mAanalog transmitter NOTE: Temperature measurement may notbeaccurate if sensor is not fully immersed in the medium of interest. due to excessively long equilibration time. |
Supply Voltage: | 12-32 VDC continuous |
Output current: | 4-20 mA |
Overvoltage protection: | Yes |
Settling time: | 4 seconds |
Wiring: |
Red Wire:(+) supply Black Wire:(-) output Shield: not connected |
Sensor type: | Volumetric Water Content(VWC) |
Range: | 0-100% VWC typical |
Resolution: | Depends on current measurement(data acquisition)device |
Accuracy: | ±6%VWC with generic calibration for supported growing media up to 65% VWC.above which accuracy lessens. Increased accuracy can be achieved with a medium-specific calibration. |
Output: | 4-20 mA current proportional to VWC |
Sensor measurement interval: | 1 second |
Operating environment temperature: |
-40℃ to 60°C NOTE:Sensors can be used at higher temperatures under some conditions. Contact METER for more details. |
Physical properties dimensions: | 8.9 cm x 1.8 cm x 0.7 cm |
Cable: | 2mor5m.3 wire (22 AWG tinned red and black wire, 24 AWG tinned bare wire); custom cable length available upon request. |
Measurement volume: | See comparison article |
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