TEROS 21The sensor consists of a humidity sensor and a porous material with a known moisture release curve. When the porous material reaches moisture equilibrium with the surrounding soil, the humidity sensor measures the moisture content of the porous material and converts it into water potential based on the moisture release curve.

The measurement range of the sensor depends on the distribution range of pore size in the porous material; The larger the aperture range, the larger the measurement range of the sensor. Commercial ceramic materials typically have uniformly sized pore sizes, which greatly reduces the measurement range.TEROS 21Using a specially made ceramic material with a very large pore size range, which allows forTEROS 21Suitable for measuring a larger range of water potential.

Sensors with a large pore size range in porous materials have poor consistency due to material heterogeneity, and the accuracy obtained by traditional calibration methods is also low. To maintain a large measurement range while ensuring high accuracy, it is necessary to calibrate each sensor separately. However, traditional calibration methods are time-consuming and expensive engineering.METERThe company has innovated its automatic calibration device, which can calibrate sensors one by one and greatly reduce calibration costs. This new technology enablesTEROS 21Becoming the first low-cost substrate water potential sensor with research grade accuracy.

Ordering Information

200.733.106 TEROS 21 SDI-12+5m cable Soil Potential