DFRobot RS485 Ultraviolet (UV) Intensity Measure Sensor (290-390nm, UVA, UVB) - IP67 Metal Housing

The sensor uses the RS485 physical layer with the Modbus-RTU application protocol. To connect to an Arduino or other 5V TTL microcontroller, you will need an external TTL-to-RS485 converter module (like a MAX485 board). Wire the converter's A/B lines to the sensor's RS485 terminals, and the converter's RO/DI pins to your microcontroller's serial RX/TX pins. Ensure you use a compatible Modbus library for data polling.

The sensor operates on a wide DC voltage range of 5 to 30V. Connect the positive supply wire to the V+ terminal and the negative/common to the GND terminal. The RS485 communication lines (A/B or D+/D-) must be connected to your host adapter with correct polarity. The sensor consumes less than 10 mA, making it suitable for low-power and remote installations.

Yes, the sensor is designed for outdoor use. Its IP67-rated metal aluminum housing provides protection against dust ingress and temporary immersion in water up to 1 meter for 30 minutes. It can operate reliably in ambient temperatures from -25°C to +60°C. For permanent mounting, use the provided screw holes and brackets to secure it on a stable surface, ensuring the cable gland is properly sealed.

The sensor outputs two primary values via Modbus registers: Ultraviolet Intensity (in mW/cm², range 0-15) and the calculated UV Index (range 0-15). The intensity resolution is 0.01 mW/cm². Accuracy is dependent on the calibrated photodiode response across the 290-390nm spectrum. For precise quantitative work, it is recommended to perform periodic calibration against a known reference, especially after prolonged exposure to extreme UV levels.