WaterScout SMEC 300 Soil Moisture/EC/Temperature Sensor Manual - Product Manuals

The soil moisture sensor consists of two electrodes that function as a capacitor, with the surrounding soil serving as the dielectric. An 80 MHz oscillator drives the capacitor and a signal proportional to the soil’s dielectric permittivity is converted to the output signal. The dielectric permittivity of water is much greater than air, soil ...