|
The SW120R Rain Detector from EML
The SW120R rain sensor works on the principle of conduction between three electrodes on a flat surface. To create a simple low cost solution to detect when it is raining. Beneath the sensing surface is embedded a 100Ω, 5-watt ceramic resistor that can be used to heat the sensor. Passing 120mA current through the resistor raises the temperature of the sensing surface approximately 20-30°C above air temperature. Operation of the heater will also stimulate rapid drying of the sensor surface giving a closer approximation of the duration of rainfall.
| ||||||||||||||||
© Environmental Measurements Limited (EML)