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RHD-Rain Sensor

Make:  Sommer     Model: RHD
✅ Extremely robust and reliable acoustic rian sensor with drop size classification
✅ The RHD is an acoustic, high precision and ultra-robust rain sensor that requires no maintenance.
✅ RHD sensor is a low-cost
✅ high precision
✅ Expandability: Ultrarobust rain gauge


The RHD is a low-cost, high precision and ultra-robust rain sensor. It features very low-power consumption, is maintenance-free and has a completely sealed acoustic detector with no moving parts. The sensing device is a polished stainless steel hemisphere supported by a strong stainless steel arm. It detects changes of the acoustic pressure that are induced by the impact of raindrops or hailstones. The RHD also includes a distrometer that returns the drop size distribution.


With its disdrometer and hail detection functions the RHD is a valuable instrument for soil erosion forcast and precipitation monitoring in agriculture. As this sensor is maintenance free, it is also suitable for remote weather stations (on- and offshore) and scientific research.





General Specification



1.4 kg (without mounting kit)


Dimension (H x W x D): 260 mm x 430 mm x 160 mm (with mounting kit)

Collector Area

Measuring Surface: 160 mm outer diameter hemisphere (402 cm2)

Precipitation Type

Precipitation detected by the sensor: Liquid (undifferentiated): rain, drizzle/rain, mixed rain/snow, sleet., Solid: hail.


Rain Intensity accuracy: 15% at 100% duty-cycle (most global precision and accuracy criteria)
Measurement accuracy (liquid only): A spatially distributed flux of controlled drops of a nominal diameter equal to the center diameter of the class ± 20% produces an output centred in the corresponding class with typically ± 50% of the flux concentrated into the two lateral size classes.
Hail detection: Counting of the number of hailstone impacts up to 5 impacts per second and for hailstone diameter detection threshold of 0.5 cm.

Power Supply

Voltage: 6 V to 30 V DC (9.6 V and 16 V DC in case of powering through the SDI-12 terminals)
Current: < 1 mA in stand-by mode and 20 mA max in acquisition mode. For a typical nominal duty-cycle of 10%: 2.1 mA (20 mA for duty-cycle of 100%).

Operating Environment

Temperature range: -40°C to +80°C,
Relative humidity: 0 to 100%

Protection Level

IP67, survive to 1 m temporary immersion in salt water


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