What is the purpose of a rain sensor in an irrigation system?

The purpose of a rain sensor in an irrigation system is to prevent irrigation during rain events. This device is designed to detect precipitation and signals the irrigation controller to pause or delay watering. By doing so, the sensor conserves water and enhances the efficiency of the irrigation system, helping to prevent overwatering and runoff. This leads to more sustainable water use and can also help protect plants from issues related to excessive moisture.

Increasing watering frequency, measuring soil moisture, and notifying users of system failures relate to different functionalities that are not the primary role of a rain sensor.