Rain & Snow Detection Sensor – RS485 Modbus or Relay Output, IP68 Outdoor Rated

The CWT-RS Rain and Snow Sensor is an industrial-grade detector designed to identify the presence of rain, snow, or storm conditions in outdoor environments. Using AC excitation sensing technology, it avoids electrode oxidation and maintains long-term sensitivity, even in harsh climates.
The sensor supports RS485 (Modbus RTU) communication or relay/switch output, making it suitable for PLC, RTU, SCADA, and building automation systems. An optional automatic heating function allows reliable snow detection in freezing conditions by preventing icing and condensation.
Manufactured by ComWinTop, this device is widely used in environmental monitoring, agriculture, aquaculture, and smart infrastructure projects.
Key Features
Rain & Snow Detection – Detects precipitation presence (rain / snow / storm)
Fast Response Time – ≤ 0.5 seconds
AC Measurement Technology – Prevents oxidation, ensures long-term stability
IP68 Protection Rating – Suitable for long-term outdoor installation
Multiple Output Options
RS485 (Modbus RTU)
Relay / switch output
Optional Automatic Heating
Designed for sub-zero and high-humidity environments
Prevents icing and condensation
Controlled Heating Temperature
Default limit: 40 °C to prevent dry oxidation
Adjustable Sensitivity – Flexible configuration for different environments
Alarm & Reset Delay Settings – Avoids false or frequent alarms