Hydra Probe II soil moisture, temperature, & salinity sensor, SDI-12 interface, 50' cable - Instantaneous sensor response with no calibration requirements
- Compact, rugged, zero-maintenance design for long-term deployments
- Easy integration with NexSens data logging & telemetry products
Stevens patented hydra probe design is unique compared to other soil moisture probes because the electrical response of soils can be specified by two parameters - the dielectric constant and the conductivity.
The dielectric constant is most indicative of water content, while the conductivity is strongly dependent on soil salinity. Unlike other capacitance type sensors, the hydra probe measures both of these components simultaneously. 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. |
