VIPA provides a dependable solution to the requirement for stand alone visibility monitoring in the tunnel environment. The instrument consists of a transmitter head and receiver head mounted 6m apart on the tunnel wall or ceiling.
The VIPA 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.
The VIPA sensors, consisting of a Transmitter (TX) and Receiver (RX), are mounted “facing” each other on the wall or ceiling along the length of the tunnel. The VIPA uses a single pass light transmission technique to measure dust, smoke and particulate concentration present in the atmosphere. The TX emits a visible (green) optical beam which is received by the RX.
Any dust or smoke particles present will attenuate the light beam and cause the intensity of the light received by the RX to fall. This reduction in light intensity is used to determine visibility in the tunnel.
Visibility measurement using the universally accepted single pass light transmission opacity technique
User selected unit display options of Opacity (%), Extinction Coefficient (k) or Meteorological optical Range (MOR)
Choice of interface options enabling easy integration into tunnel control system
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
Designed specifically for monitoring in tunnels
Rugged design to withstand corrosive atmosphere and regular tunnel washing
Simple installation and alignment
No moving parts and low maintenance requirements
Right or left hanging option to enable compliance with regulations governing tunnel light emissions facing on-coming traffic flow