The TunnelTech 200 Air Quality Monitors are an essential part of any road or rail tunnel safety system.

TunnelTech 201: CO-NO-Vis
TunnelTech 202: CO-Vis
TunnelTech 203: CO-NO
TunnelTech 204: Vis only
TunnelTech 205: NO₂

Firstly, it monitors the atmosphere within the tunnel and ensures that the tunnel ventilation system provides sufficient clean air to protect tunnel users health and for drivers to clearly see the road ahead.

The TunnelTech 200 analysers uses well proven infra-red techniques to determine CO and NO concentrations and optical attenuation to monitor Visibility levels. As there is only one moving part, reliability levels are very high and maintenance requirements are extremely low. The sight tubes have been designed to ensure that airborne dust and contaminants do not reach the optical windows and cause drift.

Fully configurable analogue and alarm outputs are exportable to the tunnel data acquisition system to provide real-time CO, NO and Visibility data.

• Continuous measurement of CO, NO and Visibility in road and rail tunnels.
• Class leading Accuracy, Repeatability and Resolution.
• Rugged, corrosion resistant construction.
• Minimal maintenance requirements.
• Optional RS 485 (Modbus) Output.

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