Environmental Monitoring Solutions
The TunnelTech 205 NO2 Air Quality Monitor is a highly efficient transmissometer configured for the continuous measurement of Nitrogen Dioxide in road tunnel atmospheres.
This extremely stable and reliable monitor incorporates a high-power blue LED to utilise the capacity of nitrogen dioxide to absorb UV and blue light to provide accurate readings in parts per billion. NO2 is produced naturally by the combustion processes within the internal combustion engine and is emitted from the exhausts of all types of vehicles.
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| Gas Species Options | Single or multi-gas measurements available: NO2 |
| Measuring Units | ppb (Parts Per Billion) |
| Response Time | Less than 200 seconds |
| Ambient Temperature | -20°C to +50°C |
| Power Supply | Supplied with 48V power supply which requires 100-240Vac 150VA |
| Construction | Corrosion resistant epoxy coated aluminum housing sealed to IP65 |
| Analogue Outputs | 2 x 4-20mA, 200V common mode isolation, maximum load 500Ω |
| Relay Outputs | 2 x volt-free contacts SPCO, 0.25A @ 125V AC, 1A @30V DC, 0.25A @ 100V DC |
| Series Data | Via CODEL serial digital data bus |
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The TunnelTech 201 Air Quality Monitor is an essential part of any road or rail tunnel safety system. 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 201 analyser 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 TunnelTech 900 is a low-cost precision road and rail tunnel monitor using proven technology to provide accurate and rapid results.
The TunnelTech 202 Air Quality Monitor continuously monitors CO, & Visibility and is an essential part of any road or rail tunnel safety system.
The TunnelTech 400 analyser electrochemical cell technology determines CO, NO NO2, SO2 or O2 concentrations. With no moving parts, reliability levels are extremely high and maintenance requirements are very low.
The TunnelTech 305 Air Flow Monitor (AFM) is CODEL's industry proven tunnel air flow monitor.
Tunnel Monitors