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TunnelCraft III Visibility


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The TunnelCraft III Visibility Air Quality Monitor (AQM) measures the visibility in a tunnel environment. The AQM consists of a transceiver that projects visible light to a reflector unit mounted 3m away. The reflected light is received by the transceiver and the specific absorption is measured to determine the visibility dimming coefficient within the path of the beams.

› High resolution measurement of visibility


Current and relay outputs direct from sensor

› Accuracy 0.0002m-1 for visibility


RS232 or RS485 - Modbus output optional


Designed to withstand the harshest of tunnel environments


Also available as a combined CO/NO/VIS sensor
› Maintenance limited to annual cleaning of optical surfaces    
TunnelCraft III Visibilty monitor  

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