Road Tunnel Weather Sensor – RWS-30

The RWS-30 Road Tunnel Weather Sensor by Biral is a professional forward-scatter visibility sensor designed for accurate monitoring of Meteorological Optical Range (MOR) and Extinction Coefficient (EXCO) in tunnels, highways, and Road Weather Information Systems (RWIS). It is specifically built for environments where reduced visibility caused by fog, smoke, exhaust fumes, pollution buildup, and fire incidents must be detected quickly to improve traffic safety and tunnel ventilation control. The sensor offers a wide visibility measurement range of 200 meters to 99.99 km with 1-meter resolution, making it highly sensitive for both air quality monitoring and fire detection. Using advanced forward scatter technology with a 39°–51° measurement angle centered at 45°, the RWS-30 provides stable and reliable visibility readings without being significantly affected by nearby objects, vehicle headlights, or flashing lights. It complies with PIARC tunnel guidelines, making it ideal for professional tunnel safety systems. Window contamination monitoring with automatic correction, window heating, and long calibration intervals help reduce maintenance requirements and improve long-term operational reliability.