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Stevens Hydraprobe

Robust soil moisture sensor for the continuous and accurate measurement of soil moisture, temperature, and salinity.
The Hydraprobe is a robust sensor for the continuous and accurate measurement of soil moisture, temperature, and salinity.
Hydraprobe Soil Moisture Sensor
The Hydraprobe is a robust sensor for the continuous and accurate measurement of soil moisture, temperature, and salinity.
  • Robust and reliable, used to ground truth NASA satellite measurements
  • Uses Coaxial Impedance Dielectric Reflectometry
  • SDI-12, RS485, or Modbus output options
With stainless steel tines, and a fully potted body, the Hydraprobe can be installed into all soil conditions, along with a robust cable to provide reliable connection to an IoT node or datalogger. The Hydraprobe can measure:
  • VWC (% Moisture)
  • Temperature (°C / °F)
  • Electrical Conductivity (EC)
  • Pore Water EC
  • Thermal compensation
  • 5 standard soil calibrations
  • Custom calibrations can be programmed into the sensor
  • Operating temperature: 40°C to 75°C

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Technical Specifications

Measurement Specifications

Measurement Accuracy Range Resolution
Real dielectric permittivity (isolated) ± 0.5% or ± 0.2 dielectric units 1 to 80 where 1 = air, 80 = distilled water 0.001
Soil moisture for inorganic & mineral soil ± 0.01 WFV for most soils ± 0.03 max for fine textured soils* From completely dry to fully saturated (from 0% to 100% of saturation) 0.001
Bulk electrical conductivity ± 2.0% or 0.02 S/m whichever is typically greater Up to 0.5 to 1.0 S/m (5 to 10 dS/m)*** 0.001
Pore Water EC N/A must have > 0.10 wfv 0.001
Temperature ± 0.3°C -40°C to +75°C 0.1°C
Inter-sensor variability ± 0.012 WFV (θ m3 m-3) n/a n/a

Electrical And Communication

SDI-12 RS-485 Modbus
Power supply 9-16 VDC 9-16 VDC 9-16 VDC
Power consumption 1 mA idle / 25 mA active 2.5 mA idle / 25 mA active 2.5 mA idle / 25 mA active
Cable 3-wire: power, ground, data 4-wire: power, ground, com+, com- 4-wire: power, ground, A, B
Max. cable length 60 m 1,219 m
Non-spliced: 304.8 m		 1,219 m
Non-spliced: 304.8 m
Baud Rate 1200 9600 1200-115200
9600 (default)
Communication protocol SDI-12 Standard v. 1.2 Custom or open spec Modbus RTU

Environmental

Operating temperature range -40°C to +75°C**
Storage temperature range -40°C to +75°C
Water resistance Tolerates continuous full immersion
Cable 18 gauge (SDI-12) / 22 gauge (RS-485 and Modbus), UV resistant, direct burial
Vibration and shock resistance Excellent; potted components in PVC housing and 304 grade stainless steel tines
* Accuracy may vary with some soil textures. ** Temperature Test Certificate from -40°C to 75°C available

Physical Dimensions

Length 124 mm
Diameter 42 mm
Weight 200 g
Optional slim housing version available: 184 g
Cable weight 80g/m
Sensing volume Length: 5.7 cm
Cylindrical region: 3.0 cm diameter

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