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Unlike many other soil moisture sensors the Hydra Probe arrives at a moisture reading by simultaneously measuring both factors, that largely influence this parameter: the dielectric constant and the conductivity. The dielectric constant is most indicative of water content while the conductivity is strongly dependent on soil salinity. The high frequency electrical measurements indicating the capacitive and conductive properties of soil are then directly related to the soil’s moisture and salinity content while a thermistor determines soil temperature. All three parameters are delivered via an SDI-12 interface.
The small, precisely defined sensing area allows accurate measurements in regions where there are strong soil moisture gradients, such as near the soil surface. Response time is immediate to changing soil moisture conditions, and no calibration is required. Equipped with a direct burial connecting cable, the Hydra Probe allows for data collection over a large study area in a variety of soil conditions.
Ordering information
200.733.103 Hydra Probe
200.733.506 A506 SDI-12 Adapter
| Technical Specifications |
Dielectric Constant
Range
Accuracy |
1 to 65, where 1= air, 78 = distilled water
± 1.5% or ± 0.2
whichever is typically greater |
Soil Moisture
Range
Accuracy |
From completely dry to fully saturated
± 0.03 water fraction by volume in
typical soil |
Conductivity
Range
Accuracy |
0 - 20 dS/m
± 2% or ±0.002 dS/m, whichever is
typically greater |
Temperature
Range
Accuracy |
10°C to +65°C
± 0.6°C |
Sensing volume (cylindrical)
Diameter
Length |
3,0 cm (1.2 ")
5,7 cm (2.2") |
| Operating Temperature |
In soils: freezing to +65°C |
| Protection |
Tolerates continuous full immersion |
| Length |
12,4cm (4.9") |
| Diameter |
4,2cm (1.6") |
| Weight |
200 gr. (probe only) |
| Output Signal |
SDI-12 |
| Power requirements |
6-30VDC, typically 20mA |
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Soil Moisture Sensors
