Hunter Irrigation Rain Sensor

Operation Of Irrigation Rain Sensor

There’s nothing more embarrassing than to watch an automatic irrigation system running when it doesn’t have to, in the rain. This is not only a waste of water; it can also damage the lawn with excessive water. An irrigation rain sensor is designed to save these embarrassing and wasteful situations. By installing an irrigation rain sensor actuated by rainfall, water is conserved when the device connected to automatic irrigation system causes the system to shut down in the event of rainfall.


Most irrigation rain sensors employ hygroscopic disks that swell in the presence of rain and shrink back down again as they dry out. Some irrigation rain sensors come with tipping bucket or conductance type probes to measure rainfall. Irrigation rain sensors are available in both wireless and hard-wired versions, both are easy to install. In countries where drought prevails, rain sensor in lawn sprinkler systems is usually mandatory.

Simple Irrigation Rain Sensor

One of the simplest and easiest to install irrigation rain sensor is the Mini-Clik sensor from Hunter. Mini-Clik provides an effective way to prevent sprinklers from coming on during or after precipitation. It shuts sprinklers off in a storm automatically and is able to compensate proportionally according to the amount of rain that fell. Once dry, the disk contract and release the switch, automatically resets without affecting the controller. An updated version of Mini-Clik, known as Rain-Clik, offers an “instant-off” feature which turns the system off at the beginning of the rain, instead of waiting for a certain amount of rainfall.