I. Product Overview RSD-A2 soil moisture sensor (hereinafter referred to as the SE-103V) ??is based on the theory and application of dielectric frequency domain measurement technology independently developed to accurately measure the volumetric water content and temperature of the soil and other porous media. Can be integrated with the greenhouse environment monitoring, soil moisture collection, automatic irrigation control system to achieve the long-term dynamics of soil moisture continuous monitoring. RSD-A2 soil moisture sensor uses a high-precision components, with good temperature stability characteristics and a wide operating temperature range, high stability; tightness RSD-A2 good soil moisture sensor, ABS plastic shell material, made of high quality stainless steel probe can withstand long-term electrolysis, acid corrosion from the soil, buried in the soil for long-term use. Second, the application areas: RSD-A2 soil moisture sensors are used in agricultural irrigation systems, greenhouses, vegetables, flowers, grass pastures, plant culture, science experiments, fast testing of soil, water conservancy hydrological monitoring. Third, the technical parameters of measurement parameters: volumetric soil moisture content range: 0 to 100%; unit:% (m3 / m3); output signals: 4-20MA current output moisture measurement accuracy: ± 1 (% by volume, to test soil correction); ± 2% (vol%, direct measurement); Temperature measurement accuracy: ± 0.1 ° C (with high precision thermometer calibration), ± 0.5 ° C (direct measurement); retest error: <1% Measuring principle: Frequency Domain reflection principle (FDR) Operating voltage: 10.8 ~ 14.4V DC Response time: <1 second measurement stabilization time: 1 second power consumption: 27mA (eigenvalues) Operating temperature range: -30 ℃ ~ 70 ℃ measurement area: 60mm (length ) x 20mm (diameter)