RDH11 – Rain Sensor with Controlled Heating

The RDH11 detector is designed to detect rain or snowfall using a durable capacitive ceramic sensor. During precipitation, a binary output is activated, which can control, for example, automated systems (roller shutters, awnings) or be processed by a data logger. Thanks to the RS485 interface, the data logger can also record approximate precipitation intensity (0–100%), the sensor’s surface temperature, and the ambient temperature.

Capacitive ceramic sensor for reliable detection of rain and snow
Binary output (raining / not raining) for controlling equipment or logging
Digital RS485 output with approximate precipitation intensity (0–100%)
Automatically controlled sensor heating during rain
Stainless steel bracket for wall or pole mounting
User-configurable parameters via RS485 (Modbus RTU / FINET)

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Description

The RDH11 uses a capacitive corundum sensor, which is automatically heated with 10–24 V DC during rain so that its temperature exceeds the ambient temperature by several °C (set to +20 °C by default), thereby minimizing false triggers during light rainfall. The binary output remains active for the duration of the precipitation, and digital communication via RS485 allows for the transmission of approximate precipitation intensity values as well as supplementary data. The detector comes with a stainless steel bracket for wall or pole mounting and can be integrated into the RK6 radiation shield along with other sensors.

Applications

Detection of rain or snowfall
Activation of the device when rain begins
Meteorological monitoring measurements
Integration with telemetry stations and data loggers
Component of warning systems and remote monitoring

Technical specifications

Technical Specifications	RDH11
Sensor Type	capacitive ceramic sensor
Outputs	binary open-collector (switches when it rains), RS485
Communication Protocols	Modbus RTU, FINET
Supply Voltage	10–24 V DC
Sensor diameter	30 mm
Device dimensions	Ø 50 mm × height 35 mm
Detector material	ABS
Connection cable	5-wire PUR, standard 3 m
Sensor heating	controlled during rain (Δ ~20 °C)
Mounting	stainless steel bracket for wall or pole mounting

Downloads

Price List Cenik 2026 V101

Related products

RDH11-T – Rain detector with controlled heating and sky temperature sensor

The RDH11-T is an enhanced version of the RDH11 detector that, in addition to detecting rain and snowfall, also measures sky temperature. The device uses a capacitive ceramic sensor for reliable precipitation identification and simultaneously provides information important for advanced meteorological applications (e.g., icing risk assessment or cloud monitoring). The binary output signals the presence of precipitation, while the RS485 interface can be used to transmit approximate precipitation intensity (0–100%), sensor temperature, and sky temperature.

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