The RWS-20 is a forward scatter visibility sensor designed specifically for road applications where accurate, dependable visibility measurements are essential for traffic safety and operations. Its robust optical design delivers stable performance in all weather conditions and is resistant to interference from local light sources such as vehicle headlights, flashing signs and warning beacons.
With a measurement range from 10 m to 7.5 km, the RWS-20 is optimised for the conditions that most commonly affect driving safety—fog, heavy rain, surface spray and snow. Heated optical windows and optional hood heating support operation in harsh winter environments, while continuous contamination monitoring with automatic compensation helps minimise maintenance effort.
For integration into roadside systems, the sensor provides serial communications (RS232/422/485) and can be configured with analogue outputs and relays for direct connection to RWIS/ITS infrastructure, data loggers, control systems and roadside signage. Calibration is performed in accordance with ICAO 9328 and is traceable to an independent national weather service transmissometer.
Key features
- Forward scatter visibility measurement in a compact, cost-effective design
- Visibility range: 10 m to 7,500 m (user-selectable upper limit)
- Resistant to local lights (headlights, street lighting, warning beacons)
- Heated optics for reliable winter operation; optional hood heating
- Automatic contamination management with two-stage cleaning warnings
- Flexible outputs: RS232/422/485, optional 4–20 mA, voltage and relays
Typical applications
- Road-side visibility monitoring and RWIS installations
- Fog and spray detection for safety management
- Integration with variable message signs and roadside control systems
- Winter operations where snow and ice can affect visibility
Click here for full details on the RWS-20 on Senseca UK website.
RWS20
