CODEL - TunnelTech 400 Series Air Quality Monitors

The CODEL TunnelTech 401 NO2 CO, NO and Visibility Air Quality Monitor is a compact extractive analyzer configured for the continuous measurement of four key parameters in road tunnels. This extremely stable and reliable monitor incorporates an LED to utilize the capacity of Nitrogen Dioxide to absorb UV and blue light to provide accurate readings in parts per billion. It also uses the same sampling system to monitor Visibility using a unique double sensor design. Two Electrochemical cells are also added to the sampling cell to measure CO and NO.

NO2 , CO, NO and particulate are produced naturally by the combustion processes within the internal combustion engine and are emitted from the exhausts of all types of vehicles. NO2 is also particularly toxic and prolonged exposure to levels as low as a few hundred parts per billion will have a detrimental effect on human health. There is a growing international requirement to measure and limit the levels of NO2 within road tunnels to reduce the exposure of tunnel users to this toxic gas. CO and NO also present a hazard to health but at much higher levels than NO2 and are now more of a nuisance to tunnels users. Visibility monitoring has two functions, to ensure that drivers can sufficiently see the road ahead to drive safely and to protect users from ingesting fine articles (<10μm) that may be carcinogenic.

The TunnelTech 401 can also play an important role in reducing energy usage within road tunnels. When employed to control tunnel ventilation systems, they can significantly reduce the use of jet fans etc. and thereby reduce energy use and its significant costs.

You can find more information on our blog:

• Arkansas and Pennsylvania roads are becoming safer with the addition on CODEL Tunnel Monitoring Products 

• Monitoring Solutions and CODEL Light the Way to Safety!