RC-SPC1K is an thick film technology rain sensor. This device is realized in Alumina (AL2O3) substrate, this material is endowed a big reliability from an electrical thermal point of view.
The sensor consists of three parts :
1) Capacitive sensor (Face A)
2) Heater generator
3) Temperature Sensor
The Face A is the sensitivity area (capacitive sensor) this area is exposed to natural agent (rain); In dry condition the value of the capacitor is nominal 100pF, in presence of the rain the capacitance goes to high valued respect the dry condition; The ratio changing is over 420%, in the table N.1 you can verify the capacitance change characteristics. On Face B is present the heating circuit the temperature sensor (NTC component) and the connection interface (six pads). On the rear of the rain sensor there is a temperature sensor NTC with a nominal resistance value 1Kohm (25°C), it’s possible use this sensor to monitor the environment temperature.
It’s possible to control the heater against particular environment condition as frost and dump.
With these 3 functions:
– Measure the capacitance
– Measure the environment temperature
– Heater control
It’s possible establish if it’s raining or not.