The **KWTS-2CD-R** is an industrial-grade **optical rain sensor** (also known as a rain gauge or precipitation sensor). Unlike traditional tipping-bucket rain gauges, this electronic part uses infrared reflection technology to detect rainfall. --- ### 1. Core Technical Specifications The device is designed for integration into weather stations, smart agriculture systems, and automation projects. | Feature | Specification | | :--- | :--- | | **Sensing Method** | Infrared Optical Reflection (Refractive) | | **Operating Voltage** | DC 12V - 24V | | **Output Signal** | RS485 (Modbus-RTU protocol) | | **Resolution** | 0.01mm | | **Material** | High-transparency polycarbonate / ABS | | **Protection Rating** | IP66 (Weatherproof) | | **Operating Temp** | -40°C to +80°C | --- ### 2. Internal Electronic Components The internal circuitry of the KWTS-2CD-R consists of several critical modules: * **Infrared Emitter & Receiver:** The heart of the sensor. It pulses an IR beam through the hemispherical dome. When rain drops land on the surface, they scatter the light, which is then measured by the receiver. * **Microcontroller (MCU):** Processes the analog light intensity data and converts it into a digital value representing rainfall intensity and cumulative volume. * **Heating Element:** Includes a built-in internal heater to prevent condensation (fogging) or icing, ensuring the optical path remains clear in cold climates. * **RS485 Transceiver:** A communication chip that allows the device to transmit data over long distances (up to 1200m) to a PLC or Data Logger. --- ### 3. Wiring Configuration The device typically utilizes a 4-wire configuration. | Wire Color | Function | Description | | :--- | :--- | :--- | | **Red** | VCC | Power Supply (12-24V) | | **Black** | GND | Ground | | **Yellow** | RS485-A | Communication Line (Data +) | | **Blue/Green**| RS485-B | Communication Line (Data -) | --- ### 4. Advantages over Mechanical Parts * **No Moving Parts:** Unlike tipping buckets, there is no mechanical wear, making it maintenance-free. * **Compact Design:** Small footprint allows for mounting on CCTV poles or mobile stations. * **High Sensitivity:** Can detect the very first drop of rain almost instantly. ---