From Decagon Devices, Inc.
In many natural and engineered soils, the output of ECH2O soil moisture sensors is sensitive to variations in the soil temperature. The temperature sensitivity is not caused by the ECH2O sensors themselves which are almost perfectly insensitive to temperature changes, but rather the electrical characteristics of the soil, which can be quite sensitive to temperature changes. The ECH2O sensors measure volumetric water content (VWC) by measuring the dielectric permittivity (?) of the bulk soil. ??in the soil is a complex quantity with both real (?') and imaginary (?') components. ?' is the real dielectric permittivity of the soil constituents, and has a negative correlation with temperature.
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Topics of Interest
Since the introduction of the ECH2O soil moisture probe, there has been considerable interest in using them to measure volumetric water content of soil-less media such as potting soils, rockwool, and...
Decagon's ECH2O probes measure the volumetric water content of the soil by measuring the dielectric constant of the soil, which is a strong function of water content. However, not all soils have...
Capacitance and TDR techniques are often grouped together because they both measure the dielectric permittivity of the surrounding medium. In fact, it is not uncommon for individuals to confuse the...
Decagon's ECH2O EC-5, ECH2O-TE, and 5TE (replaces ECH2O-TE) probes are used in a variety of soil and soil-less media types, some of which require an adjustment to the probe calibration. To help with...
The ECH2O Check reader is shipped with a factory-supplied calibration that relates the mV output of the ECH2O probe (models EC-1 and ECH2O -10) to the actual volumetric water content (VWC) of the...
