defr Glossar

In road and railroad tunnels, fires or dense smoke is often caused by overheated engines and turbo charges, locked brakes, defective tires, ignited cargo, etc. Fire detectors/smoke detectors installed in the tunnel serve the purpose of initiating the safety and rescuing scenario in order to allow the people to escape the area by their own devices. For this purpose, they have to detect the risk of fire as quickly as possible and to localize the event.

There are several kinds of fire detectors:

  • Linear fire alarm cables reacting to the increase in ambient temperature and allowing the localization of the fire. This method has the disadvantage that it will only detect an event when an open fire has already broken out. However, most fires in road tunnels and railroad tunnels start as smouldering fires producing life-threatening smoke fumes.

  • The video detection system of the tunnels should detect the presence of smoke as well as localize the event. Experience shows, however, that too many false alarms are triggered by extraneous light, light reflections from windscreens, change of contrast etc.

  • Scattered light measuring instruments which are based on the same photometric principle as the visibility determination. These SIGRIST instruments detect the presence of smoke very rapidly even at an early stage (cold smoke). They can also be equipped with temperature sensors and thus support localization of the event. Smoke detection
Index

Contact distribution partner

{{selectedCountry.Name}} {{country.Name}}

Please select your businessarea

{{ba.Name}}

Please select

{{area.Name}}

Please select your businessarea

{{ba.Name}}
{{selectedCountry.Name}} {{country.Name}}
{{vm.getBusinessAreaStringByVendor(vendor)}} {{area.Name}}
{{vm.getBusinessAreaStringByVendor(vendor)}}
René Gehri
Water, Beverages & Food, Industrial Processes
Florian Bodmer

Contact headquarters

Felix Joller
Sales Manager ScrubberGuard
Öffnungszeiten:
Montag–Freitag 08:00–12:00 und 13:30–17:00
Feiertage & Betriebsferien:
Ostern: 07.–10. April 2023, Auffahrt: 18. Mai 2023, Pfingstmontag: 29. Mai 2023, Fronleichnam: 08. Juni 2023, Bundesfeiertag: 01. August 2023, Maria Himmelfahrt: 15. August 2023, Allerheiligen: 01. November 2023, Maria Empfängnis: 08. Dezember 2023, Betriebsferien: 23. Dezember 2023 – 02. Januar 2024
Opening hours:
Monday–Friday 08:00am–12:00pm und 1:30pm–5:00pm
Public & company holidays:
Easter: 07.–10. April 2023, Ascension Day: 18. May 2023, Whit Monday: 29. May 2023, Corpus Christi: 08. June 2023, Federal Holiday: 01. August 2023, Assumption Day: 15. August 2023, All Saints Day: 01. November 2023, Conception of Mary: 08. December 2023, Company holidays: 23. December 2023 – 02. January 2024