Rain Detector DRD11A

Vaisala DRD11A Rain Detector detects rain and snow quickly and accurately. It uses droplet detection instead of signal level threshold.

A delay circuitry allows a two-minute interval between raindrops before assuming the OFF position (no rain). This enables the sensor to accurately distinguish between rain cessation and light rain.

DRD11A also features an analog rain signal for estimating rain intensity. Since this signal is proportional to the percentage of moist or wet area on the sensor plate, rain intensity has a direct impact on the amplitude and variation of this analog signal.

The DRD11A sensor is positioned at a 30° angle. The design together with the internal heating element ensure that the surface dries quickly. This is an essential factor for calculating intensity. The same heating element also protects the surface from fog and condensed moisture. It activates at low temperatures to melt snow and allow snow detection. Sensor performance is not affected by reasonable amounts of dirt and dust due to droplet detection.

The low heating power model DRD11L is designed for areas with only rain or wet and moist snow precipitation.