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.

Capacitive ceramic sensor for detecting both rain and snow
Binary output (open collector) – precipitation indication
RS485 digital output (Modbus RTU / FINET)
Approximate precipitation intensity: 0–100%
Integrated sky temperature measurement
Controlled sensor heating during precipitation
Rugged design suitable for outdoor installation

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Description

The sensor unit is equipped with controlled heating, which activates during precipitation and maintains the sensor surface at approximately 20 °C above the ambient temperature. This minimizes false triggers and ensures that the surface dries quickly after the rain stops.

The integrated sky temperature sensor expands the device’s range of applications, particularly in meteorology, road management, and anti-icing applications. Communication takes place via RS485 (Modbus RTU / FINET), which allows for easy integration into telemetry and control systems.

The detector comes with a stainless steel bracket for mounting on a wall or pole.

Applications

Real-time rain and snowfall detection
Weather stations and climatological measurements
Road and bridge systems (ice prevention)
Control of precipitation-dependent technologies
Integration into telemetry and warning systems

Technical specifications

Technical Specifications	RDH11-T
Sensor Type	capacitive ceramic
Additional Measurements	sky temperature
Outputs	binary open collector, RS485
Communication Protocols	Modbus RTU, FINET
Supply Voltage	10–24 V DC
Housing Material	ABS
Sensor Diameter	approx. 30 mm
Connection cable	5-wire PUR, standard 3 m
Heating	controlled during precipitation (Δ ~20 °C)
Mounting	stainless steel bracket for wall or pole mounting

Downloads

Price List Cenik 2026 V101

Related products

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.

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