Soil Moisture, Temperature & EC Sensor
The 508E sensor can simultaneously measure the three parameters of soil temperature, soil volumetric water content and soil electrical conductivity (EC).
Principle:
Soil temperature: The sensor is equipped with a digital temperature sensing chip on a probe, which uses copper-clad method to increase the temperature conduction efficiency, which is used to measure the surface of the probe, that is, the temperature of the soil.
Soil volumetric water content: The sensor uses the FDR principle based on the dielectric constant, which has been used to measure the influence of the soil dielectric constant on the transmission of high-frequency signals to reverse the soil water content.
Soil electrical conductivity (EC): The sensor measures the impedance by applying alternating current on two metal probe points to calculate the soil electrical conductivity. The alternating current method avoids the polarization effect caused by the unidirectional voltage, and at the same time, the conductivity measurement is also added and the temperature self-correction.
Parameters
Temperature: Measuring range: -20-80℃, resolution 0.1℃, accuracy ±0.5℃
Soil volumetric water content: measuring range: 0-100%VOL, resolution 0.1%, accuracy ±3% (0-45%), ±5% (>45%)
Soil conductivity: measuring range: 0-6000μS/cm, resolution 10μS, accuracy ±5%
Precautions for use
1. Pay attention to ensure that the probe is in full contact with the soil during installation
2. The accuracy of soil volumetric water content only guarantees that the soil temperature is higher than 0°C (dielectric constant changes greatly when water freezes)
3. The accuracy of soil conductivity only ensures that the soil temperature is higher than 0℃ and the soil volumetric water content is higher than 20%VOL
4. It should be ensured that the two probe points of soil conductivity are clean. When the probe points are oily, it will greatly affect the accuracy of the conductivity.
