- Model III - Visibilty Air Quality Monitor (AQM)

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TunnelCraft - Model III - Visibilty Air Quality Monitor (AQM)

The TunnelCraft III Visibility Air Quality Monitor (AQM) uses visible light channels to measure the visibility within 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
  • Accuracy 0.0002m-1 for visibility
  • Designed to withstand the harshest of tunnel environments
  • Maintenance limited to annual cleaning of optical surfaces
  • Current and relay outputs direct from sensor
  • RS232 or RS485 - Modbus output optional
  • Also available as a combined CO/NO/VIS sensor
Codel International Ltd
Codel International Ltd
Station Building, Station Road
Bakewell , Derbyshire; DE45 1GE


Road tunnel atmosphere monitoring

CODEL`s road tunnel monitors are designed exclusively for road tunnel applications. It offers a family of tunnel sensors that provide all the essential measurements necessary to monitor the tunnel atmosphere.


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