Nitrogen dioxide (NO2) is fast becoming the most important measurement in tunnels and will eventually replace nitric oxide (NO) as the key measurement. The TunnelCraft III NO2 Air Quality Monitor (AQM) uses a high-power blue LED to measure the attenuation of UV/blue light by NO2 in the tunnel atmosphere.

The AQM consists of a transceiver that projects the light beam to a reflector within a stainless steel tube mounted 1m away. Sintered filters in the measurement chamber allow gases from the tunnel atmosphere to diffuse into the chamber while inhibiting the passage of particulates.The NO2 sensor can be used as a stand-alone instrument or as part of a multi-point monitoring system.

Key Featuresno2-large-cut-800px

  • High accuracy and stability
  • Simple operation – no moving components
  • High reliability
  • Fully configurable current and relay outputs
  • Output in ppb (parts per billion)
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Feature

Specification

Measurement NO2 – Nitrogen Dioxide
Measuring units ppb (Parts Per Billion)
Response Time Less than 200 seconds
Ambient Temperature -20°C to +50°C
Power supply 48V DC, 50VA from Station Control Unit (SCU)
Construction Measurement Chamber – 316L stainless steel, Sensor – Epoxy coated aluminium
Analogue outputs 2 x 4-20mA, 200V common made isolation, max. load 500Ω
Logic Outputs 2 x volt-free contacts SPCO, 0.25A @ 125V AC, 1A @30V DC, 0.25A @ 100V DC
Serial Data RS485 Modbus Protocol

To view theTunnelCraft NO2 full specification please click here to download the product datasheet.

Lang Filetype Document Link Size
English Adobe_Acrobat_Pro_PDF Tunnel Craft 3 NO2 Datasheet Download File 400kb
English Adobe_Acrobat_Pro_PDF Tunnel Craft 3 NO2  Manual Download File 400kb

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