Visibility Only Monitor
The TunnelTech 204 Air Quality Monitor continuously monitors visibility and is an essential part of any road or rail tunnel safety system.
The TunnelTech 204 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 204 analyser uses well proven optical attenuation technology to monitor visibility levels.
As there is only one moving part, reliability levels are very high and maintenance requirements are extremely low.
Features & Benefits
|Gas Species Options||Single or multi-gas measurements available: Visibility
|Measuring Units||m-1 or m for visibility
|Response Time||Vis 10s – 2min Selectable
|Ambient Temperature||-20°C to +50°C
|Power Supply||12 – 24V dc 1.5A
|Construction||Corrosion resistant epoxy coated aluminum housing sealed to IP65
|Analogue Outputs||3 x 4-20mA current outputs as standard, isolated, 500Ω maximum load, fully configurable
through TunnelTech software
|Relay Outputs||3 x volt-free SPCO contacts, 50V, 1A max, configurable as alarm contacts
|Serial Data||For local connection to laptop PC using RS232 or optional RS485 interface unit
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