Vipa-MkII 2




The VIPA MkII tunnel monitor makes a visible opacity measurement to determine the visibility within the tunnel. These measurements can be used as part of an air quality management system for ventilation control and/or secondary smoke detection within a traffic tunnel, rail tunnel or other confined space.


  • Visibility measurement using the widely accepted single pass light transmission opacity technique
  • User selected unit display options of Opacity (%), Extinction Coefficient (k), Meteorological Optical Range (MOR) or Transmission
  • IP65 / NEMA 4X rated external enclosure supplied with quick release dust protection tubes and wall brackets
  • Supplied complete with PC based utility software for set-up and control of the instrument
  • Intelligent analyser with optional TSCU operator interface
  • Choice of interface options enabling easy integration into tunnel control system


  • Designed specifically for monitoring in tunnels
  • Rugged design to withstand corrosive atmosphere and regular tunnel washing
  • Plug and socket connection enabling simpler installation
  • No moving parts and low maintenance requirements
  • Suitable for right or left hanging to enable compliance with regulations governing tunnel light emissions facing on-coming traffic flow