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Sigrist VisGuard

VisGuard

The Sigrist VisGuard is your partner in the safety and monitoring of road and rail tunnels. To ensure safety in a critical tunnel application you need to have dependable information on 

  • Visibility measurement 
  • Ventilation control 
  • Early fire/smoke detection in road and rail tunnels 
  • Dust concentration in air 
  • Detection of oil mist 

Visibility, CO concentration, and sometimes NO concentration are vital criteria for assessing air quality in road tunnels. These parameters are used for controlling the ventilation system in order to minimise energy consumption and also for closing down the tunnel whenever pre-established safety limits are exceeded.   

The  VisGuard is available in different versions:  In-situ, Extractive or Mini-extractive Installation  

Sigrist FireGuard

FireGuard

The Sigrist FireGuard detects emerging fires at their early stages (cold smoke). The sensor uses the available natural air stream in the tunnel. This leads to a greater time for escape and orderly evacuation. (If fog is a potential issue, any influence caused by fog will be eliminated by optional heating elements).  

The sensor is very compact and has no moving parts needs no consumables.  

There are a variety of mounting methods: 

  • Wall 
  • Arched or flat ceiling 
  • Ventilation dampers