Hydreon Optical Rain Sensor

Use it to measure rainfall or to close a skylight when it starts raining

Rain Gauge Model RG-11

The RG-11 Rain Gauge senses water hitting its outside surface using beams of infrared light. It uses the same sensing principle used in millions of automotive rain sensing windshield wiper controls. Consequently, it is remarkably inexpensive, at just $59 for a single unit.

The RG-11 is optical– not mechanical, chemical, or conductive. Consequently, it is far more rugged, sensitive and reliable than any other technology. The sensor is extremely sensitive, and virtually immune to false trips. Yet, it is completely unaffected by jostling and motion. There are no exposed conductors to corrode, and no openings for bugs to crawl into. There is no place for leaves or other debris to collect.

Rain Guage rg-11

The patent-pending Rain Gauge optical design keeps the beams inside the sensor, away from the influences of falling leaves and spiderwebs.

Applications for the Rain Gauge

The RG-11 Rain Gauge is suitable for almost any application that requires a reliable and sensitive rain sensor, including:

Condensation Sensing

You can use the RG-11 to reliably detect condensation or frost.

Learn More

Irrigation Control

The RG-11 Rain Gauge measures both rain accumulation and rain intensity.

Learn More

Drop Detection

The RG-11 may also provide drop detection for your own external data interpretation.

Learn More

Wiper Control

The RG-11 Rain Sensor can be used to control a wiper system on boat, ship, locomotive, and more

Learn More

RG-11 Modes of Operation

The RG-11 Rain Sensor includes a DIP switch that allows it to be set up for the mode of operation that best matches the application.

RG-11 Circuit Board
The Rain Gauge circuit board. The DIP switch programs the mode, and connections are made with convenient screw terminals.

Tipping Bucket

Replace your tipping bucket with a low maintenance alternative

“It’s Raining”

Close a skylight at the first sign of rain, and open it when it stops raining

Condensation Sensing

In this mode, the Rain Gauge continuously monitors the clarity of the sensing surface.

Wiper control

This mode will control the wipers from off through intermittent and steady-slow speeds.

Irrigation Control

This mode will measure both rain accumulation and rain intensity.

Drop Detection

Use this mode if you want to do your own external data interpretation.

Questions? Email us at or call 877-5-SENSOR (877-573-6767)