Tunnel safety systems need early visibility changes to be detected before pollution or smoke becomes a serious operational risk. RWS-30 is a forward scatter visibility sensor for road and tunnel applications, measuring MOR and EXCO to support fog detection, pollution monitoring, fire-related smoke detection and ventilation control.
The compact optical design is built for stable readings in demanding environments and is not affected by lights. Window contamination monitoring continuously checks both sensor head windows, applies automatic correction and provides staged cleaning warnings, helping maintenance teams act only when service is needed. Calibration is traceable to a national weather service transmissometer, supporting confidence in long-term measurement quality.
RWS-30 integrates into RWIS and tunnel control systems through RS232, RS422 or RS485 serial data, plus 0...10 V and 4–20 mA analog outputs for MOR or EXCO. Optional volt-free relays provide direct thresholds for alarms, tunnel entrance signs or ventilation systems. The powder coated aluminum housing is rated IP66/IP67 and operates from -40 °C to +60 °C.
Uses IR light and a forward scatter meter with 39° to 51° angle to measure visibility.
Provides averaged Meteorological Optical Range and atmospheric extinction coefficient for tunnel monitoring.
0...10 V and 0/4...20 mA outputs can be configured in relation to the selected visibility range.
Optional relays include one fault relay and two threshold relays, with configurable trigger events.
Standard data messages include self-test status, window contamination status, reset indication and test mode indication.
Supplied U-bolts support mounting on poles with 40 to 64 mm outer diameter.
Code: RWS-30 [1] [2]
Example: RWS-30WR.RC.
[1] Optional Relays
NR. = Without relay outputs
WR. = Including relay outputs
[2] Configuration
RC. = Regular configuration
SC. = Special configuration
