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Gas detectors
AS-EV492-xxx
Electrochemical cell detectors for CO, CO2, NO, NO2 etc. Measuring principle is the electrochemical reaction inside the sensor caused by gas concentration. Selectivity of these devices is really high. These devices precisely measure toxic gases across the tunnel and permit to start alarms upon crossing of some key thresholds.
Used with other Tunnelvista devices permit to have a complete view of the air quality in the tunnel and to send these parameters to viewing and monitoring system for data storing and ventilation control.
AS-ROG20/30-xxx
Optical Gas detectors for CO, CO2, NO, NO2 etc. Measuring principle is absoption of an optical signal by diffusion of gas in the analyzing chamber of the detector. Selectivity is guaranteed by high quality optical narrow band filtering. These devices precisely measure toxic gases across the tunnel and permit to start alarms upon crossing of some key thresholds.
Used with other Tunnelvista devices permit to have a complete view of the air quality in the tunnel and to send these parameters to viewing and monitoring system for data storing and ventilation control.