- 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.

Features

  • 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

Product Overview

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The TunnelCraft 3 Air Quality Monitor (AQM) is CODEL’s industry proven tunnel atmosphere sensor.

Three decades of development, knowledge and practical experience have been utilised to produce this advanced-technology tunnel sensor which gives complete flexibility in the choice of measurement options whilst delivering superb accuracy and reliability at a very competitive price.

The Air Quality Monitor (AQM) enables the measurements of CO, NO, and visibility to be combined into a single compact sensor, consisting of a transceiver that projects visible and infrared beams to a reflector mounted 3m away. The reflected light is received by the transceiver and the specific absorption is measured to determine the visibility coefficient, carbon monoxide and nitric oxide concentrations within the path of the beams.

Using only one moving component within the sensor and a fully automated zero calibration function, the AQM is designed to be maintenance free limiting service visits to annual cleaning of optical surfaces.

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Fully configurable analogue and alarm outputs are generated direct inside the sensor alleviating the requirement for expensive processing monitoring stations. In addition there is a choice of either RS232 or RS485 outputs which can be utilised to deliver MODBUS protocol to a SCADA system located in the tunnel control centre.

The AQM is available with a choice of a visibility measurement only, dual CO & visibility measurement, and combined CO, NO & visibility measurements, to suit varying tunnel specifications.

Over the last 15 years CODEL tunnel sensors have been supplied to more than 400 road and rail tunnels throughout the world. Our impressive reference list includes Eurotunnel France, Mont Blanc Tunnel France, Dartford Tunnel UK, Lane Cove Tunnel Australia, Snow Mountain Tunnel Taiwan and the SMART Tunnel in Malaysia, plus many others thoughout China, Italy, Switzerland and South Korea placing CODEL as a world leader in tunnel atmosphere monitoring.

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CODEL’s tunnel sensor range is further extended by additional sensors for the measurement of NO2 and tunnel airflow.
Please see additional product data sheets:-

  • TunnelCraft 3 Air Flow Monitor
    • For the measurement of wind speed and direction
  • TunnelCraft 3 NO2 Monitor
    • For the measurement of nitrogen dioxide
Codel International Ltd
Codel International Ltd
Station Building, Station Road
Bakewell , Derbyshire; DE45 1GE

APPLICATIONS

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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