How rain sensors work. The two leading manufacturers of irrigation products, Rain Bird and Hunter, both make rain sensors and both detect rain using the same method. They have a series of porous cork discs that when they get wet from rain, they expand and force the sensor to prevent the controller from watering.Click to see full answer. Just so, how does a rain sensor work?The rain sensor works on the principle of total internal reflection. An infrared light beams at a 45-degree angle on a clear area of the windshield from the sensor inside the car. When it rains, the wet glass causes the light to scatter and lesser amount of light gets reflected back to the sensor.Also, how do I know if my rain sensor is working? For a cork-disc sensor: Locate the rain sensor for your irrigation system. Turn on the time clock for the zone nearest the sensor. Press and hold down the button on top of the sensor. Release the button and the zone should come back on. If the system does not shut off or come back on, check for wiring problems. Hereof, how long does it take for a rain sensor to dry out? All Hunter rain sensors have an adjustable “Vent Ring.” Dry out time could be as little as 4 hours, depending upon weather conditions (temperature and humidity) and how the vent ring is set.How can you tell if you have a rain sensing windshield?First, if your wipers automatically turn on when raindrops come in contact with the windshield then you have a sensor. You can also check by looking from the outside – behind the rear view mirror. If you see a strip of lens or film that faces the outside that is adjoining your light sensor.
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