HD2013.3 rain detector

Product Description

The HD2013.3 Precipitation Detector is a smart sensor designed to detect rain and snow events using a capacitive sensing principle, providing fast and reliable indication of precipitation.

An integrated heater keeps the sensing surface dry, preventing false detection from fog or dew and enabling accurate operation even in cold environments by melting snow. The sensor automatically distinguishes between rainfall and snowfall based on ambient temperature.

With support for RS485 Modbus, analog outputs, and relay contact, the HD2013.3 integrates easily into weather stations, road monitoring systems, and industrial automation. Its IP68-rated housing and built-in auto-calibration ensure stable, long-term outdoor performance with minimal maintenance.

Key Features:

• Detects rain and snow (precipitation ON/OFF)
• Capacitive sensing technology for reliable detection
• Integrated heater to prevent false signals (fog, dew) and enable snow detection
• Automatic differentiation between rainfall and snowfall (temperature-based)
• Output options:
  • RS485 (Modbus RTU / proprietary protocol)
  • Analog (4–20 mA or 0–10 V)
  • Relay contact (precipitation alarm)
• Measures sensor wetness level (% dry surface) and ambient temperature
• Configurable detection threshold, sensitivity, and delay
• Built-in auto-calibration algorithm for long-term stability
• Rugged IP68 enclosure for harsh outdoor environments
• Wide operating range: -40°C to +60°C
• Supplied with mounting bracket (Ø30–50 mm mast)

HD2013.3 does not measure the rainfall amount. For such applications, a rain gauge should be used.

For control applications, the voltage-free contact output (normally open when dry) should be used. There are MODBUS-RTU and 4-20 mA outputs available, with quantitative measurement of the fraction of the wet/dry area of the sensing part.

Shown below are some photos of HD2013.3: