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250-40561 MAS-1 Soil Moisture Sensor 4-20mA

250-40561 MAS-1 Soil Moisture Sensor 4-20mA
250-40561 MAS-1 Soil Moisture Sensor 4-20mA
The 250-40561 MAS-1 Soil Moisture 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.
Product Details

The 250-40561 MAS-1 Soil Moisture 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 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 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.

Specifications

  • Interface: standard 4-20 mA analog transmitter
  • 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 aquistion) 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 temperature: -40° to 60° C (Sensors can be used at higher temperatures under some conditions. Contact NovaLynx for more details.)
  • Dimensions: 8.9 cm x 1.8 cm x 0.7 cm
  • Cable: 2 m or 5 m, 3 wire (22 AWG tinned Red and Black wire, 24 AWG tinned bare wire); custom cable length available upon request.

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