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MR42 Rain Sensor

MR42 Rain Sensor

Quick Overview

The MR42 is a capacitance type rain sensor with an output (open collector) for either raining or not raining condition. The green sensor surface sensor is coated to protect against pollution and is heated a few degrees above ambient to ensure that it is not affected by fog or dew, plus it will help drying the surface after the precipitation has stopped falling.
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Measurement Principle

This rain sensor has been developed for the detection of precipitation like rain, sleet and snow. When precipitation falls on the green sensor surface the output (Open collector) will switch on to GND (Ground). The green coating is especially developed for protection against copper (or other metal) and other kinds of pollution. The rain sensor is equipped with a circuit that heats the surface a few degrees above ambient temperature. This ensures that the rain sensor is not affected by fog or dew. The heating will also help to dry out the surface after the precipitation has stopped falling and therefore ensure the output will switch faster to “no precipitation”.

The rain sensor can be equipped with a wind shield (option), which prevents the wind from interfering with the measurements.


Sensor: Capacitive sensor with heating and special green coating (insensitive for copper and pollution).
Material: Polycarbonate
Weight: c 0.2Kg
Supply Voltage: 12vDC / 400mA Max
Operating Range: Precipitation / No Precipitation
Output Signal: Open Collector (High = No Precipitation, Low = Precipitation)
Operating Temperature: -20 to +50°C
Warranty: 2 Years

Availability: Stock Item


Components / Downloads

For further information, technical advice, or a quotation please call or email us. If you are not sure which product you need one of our technical sales advisors will be happy to discuss your application. We also accept company purchase orders by fax or post. Credit card orders can also be placed over the phone for any product.

Rain Detector: Measuring principle: capacitive. With green coating. Supply voltage: 12vDC @ 400mA max. Includes heater. Output: open collector (RAIN / NO RAIN) Operating temperature: -20 to +50°C. Dimensions: 80 x 80 x 55 mm.
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