RPS1 - Rain presence sensor
Main applications
The rain detector is used both for connection to a PLC/Datalogger data acquisition system (for example inserted in a meteorological station that detects the duration of the rainy event) and as a stand-alone device with integrated relay contact to pilot actuators external (e.g. motors, valves, pumps, sirens, etc…).
The main applications are:
- Industrial and civil automation
- Agriculture and irrigation
- Meteorology
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Description
MAIN FEATURES
The RPS1 sensor is a rain detector based on the electrolytic-conductive principle of water which, depositing itself on the sensitive element of the sensor, generates a variable capacity according to the presence of rain or snow drops. This variation generates a 4…20mA analogue signal proportional to the presence of drops from 0 to 100% of the sensitive surface of the sensor.
RPS1 is equipped with a “Rain ON/OFF” switching relay contact output which signals the presence (ON status) or not (OFF status) of precipitation of rain (or snow).
A heater integrated in the sensor keeps it dry because, by evaporating the water that has fallen on the surface of the sensitive element, it avoids false signals due to fog or condensation. Furthermore, at low temperatures, the heater melts the fallen snow, thus allowing the instrument to detect snowfall. The heater switches on and off automatically only when the sensor is in sufficiently wet mode.
The sensitivity of the heater activation can be varied by adjusting a potentiometer inside the PCB indicated as – SENS + . Its adjustment can delay or anticipate the closing of the relay based on the amount of water deposited on the sensitive surface.
ADVANTAGES
- Excellent quality/price ratio
- Excellent accuracy
- Possibility to evaluate the cleaning status of the sensor from the 0…2Vdc diagnostic output
