Hydreon RG-9 Rainfall Sensor

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The Hydreon RG-9 Solid State Rain Sensor is a rainfall sensing device intended to detect and communicate when a pre-selected rain intensity has been reached or exceeded. The RG-9 is rugged, reliable, and maintenance-free.

The RG-9 uses beams of infrared light within a plastic lens about the size of a tennis ball. The round surface of the lens discourages collection of debris, and the RG-9 has no moving parts to stick, and no water-pathways to clog. The device features an open-collector output that indicates when the selected rain intensity has been reached. The sensitivity levels are: Rain Drops, Very Light, Medium, Heavy. The duration of the positive detection is also selectable: No Hold, Hold Time 5 Minutes, Hold Time 10 Minutes, Hold Time 15 Minutes.

The RG-9 has multiple outputs: visual output via an on-board LED, Open Collector output and RS232 serial communications that provide more detailed data, including 8 near real-time rain intensity levels and allow for reading the status and configuration of the device. Power consumption of the RG-9 is very low, and the device is well-suited to solar-power applications.

Parameter Value
Input Voltage Range 5-15 VDC on J1 Reverse polarity protected to 50V or 3.3VDC through pin 8 on J2
Current Drain 110 μA nominal. (No outputs on, dry not raining) 2-4 mA when raining
Output NPN Open Collector Output 100 mA / 80V Max
Operating Temperature -40°C to +60°C (Will not detect rain when freezing)
DIP Selectable Sensitivity Rain Drops
Very Light
RS232 Port 3.3V
Supported Baud Rates 1200, 2400, 4800, 9600, 19200, 38400, 57600

Technical Document can be found here