Hydreon Rain Sensors

Hydreon Sensors are now in stock and available from our online shop!
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rg11The Hydreon Optical Rain Gauge family is a reliable and cost-effective choice for precipitation measurements. The sensor package is about the size of a tennis ball and completely sealed from the environment. A built-in mounting arm allows for convenient mounting to weather station masts, buildings, and other infrastructure.

The Rain Gauge senses water hitting its outside surface using beams of infrared light, modelling the principle used in automotive rain-sensing windshield wiper controls. The optical gauge bounces the infrared beams within the sensor lens, and as rain drops hit the surface, the infrared light

Rain Gauge cross section
The patented Rain Gauge optical design keeps the beams inside the sensor, away from the influences of falling leaves and spiderwebs.

escapes through. Changes in the intensity of the infrared beams during rainfall are directly correlated with the size of the rain drop. The system automatically compensates for condensation and very small drops; it can detect rain drops less than a half millimetre in size!

Optical sensing technology overcomes many of the shortcomings of conventional tipping bucket rain gauges. The sensor works in mobile environments, there is no collecting funnel to clog with leaves, and the round shape makes it essentially self-cleaning. With a range of accuracies available, applications now include a tipping bucket rain gauge replacement. The compact size makes them ideal for wet weather notification systems or remote rain gauges where periodic maintenance is not possible.

Model Comparison

Hydreon has a Rain Gauge suitable for almost any application that requires a reliable and sensitive rain sensor. The physical dimensions for each model is the same:
Length: 4.8″ (121 mm) Width: 2.8″ (71 mm) Height: 2.2″ (56 mm) Weight: 4.3 oz (122 g)
Including the moisture proof connector: Height: 3.0″ (76 mm) Weight: 4.5 oz (128 g)

RG-11 RG-15 (New) RG-9 (New)
High Accuracy Tipping Bucket
Wiper Control
Drop Detection
Condensation Sensing
Irrigation Control
Rain Water Harvest
“It’s Raining Mode”
Low Power
Unique Hardware Heater Prevents Frost
Current Drain 1.5 mA Nominal 15 mA Raining 110 μA Nominal 4 mA Raining 110 μA Nominal 4 mA Raining
Tipping Bucket Accuracy ±36% 2/3 of the time ±10% in our controlled environment
Serial Communication RS232 Unsupported Transmitted Registers Unidirectional Command Based Bidirectional Command Based Bidirectional

For more detailed information on each sensor, click on the links below.

RG-11 Sensor

RG-9 Sensor

RG-15 Sensor