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10. Which setting do I use?

You will want the sensor to shut off the sprinkler system only after enough rain has fallen to satisfy the water requirements for any given period. Therefore, the sensor setting you select will depend mostly on what sprinkling cycles the timer-controller is set to apply to the irrigated area.

For example, if the controller is set to irrigate the equivalent of 3/4" of rain in a week's time (a common amount) and it does that on 3 days of the week, then each cycle is putting down approximately 1/4" of water. Based on this, the sensor should be set for 1/4" of rainfall.

The sensor has settings for rainfall quantities as low as 1/8", 1/4", 1/2", 3/4" or 1". Most homeowners start at 1/4" and monitor the sensor for a period to see if any additional adjustment is needed.

Last Updated : 02/08/2007

What is a rain sensor?