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Soil Water Potential Sensor
MODEL GEO-MPS2 - Maintenance-Free Water Potential and Temperature Sensor
Unlike tensiometers, which need a skilled operator, the dielectric water potential sensor model GEO-MPS2 needs no care or feeding. Instead, it can simply be packed into a hole, plugged into a data logger, and left to log water potential data.
Its extended range makes this sensor ideal for measuring the water potential in natural systems or other drier systems where cavitation of tensiometers is a concern. The added temperature measurements can be used to determine approximate soil water potential in partially frozen soils.
Deficit irrigation monitoring and control.
Water potential monitoring in the vadose zone.
Waste water drainage studies.
Plant water availability.
The GEO-MPS-2 measures a wide range of soil water potentials (-10 to -500 kPa (pF 1.71 to pF 3.71) without user maintenance and factory calibration.
Accuracy Soil Water Potential: ± 25% of reading from -10 kPa to -100 kPa Soil Temperature: ± 1°C
Resolution Soil Water Potential: 0.1 kPa Soil Temperature: 0.1°C
Range Soil Water Potential: -10 to -500 kPa (pF 1.71 to pF 3.71) Soil Temperature: -40°C to 50°C
Measurement Speed 150 ms (milliseconds)
Equilibration time 10 min to 1 hr depending on soil water potential
Sensor Type Frequency domain with calibrated ceramic discs, thermistor
Output RS232 (TTL) with 3.6 volt levels or SDI-12 communication protocol
Operating Environment -40°C to 50°C
Power 3.6 - 15 VDC, 0.03 mA quiescent, 10 mA max during 150 ms measurement
Cable Length 5 m, custom cable lengths available
Cable Connector Types 3.5 mm "stereo" plug or stripped and tinned lead wires (3)
Sensor Dimensions 9.6 cm (l) x 3.5 cm (w) x 1.5 cm (d)