This rain sensor has been developed for the detection of precipitation such as rain and snow. In case of precipitation on the sensor surface, the output (Open collector) will switch to GND (Ground). The green coating is especially developed for protection against copper (or other metals) and other sources of pollution. The rain sensor is equipped with a circuit which heats the surface a few degrees above ambient temperature. This assures that the rain sensor is insensitive to fog and dew and it will also help to dry the surface after the precipitation has stopped (which will minimize the delay in the output switching to “no precipitation”).
The rain sensor can be equipped with a wind shield (option), which prevents the wind from interfering with the measurements.