Detectors

A detector is selected based on the goal of earliest and safest detection possible.

When choosing a detector, the following criteria is important:

  • What is to be detected (smoke / heat / flame / gas)
  • Type of fire / fire development
  • Environment / surroundings
  • Location
  • Coverage area
  • Acceptable degree of nuisance alarms.

KEY POINTS IN NORWEGIAN NORMS

Local regulations will apply

Naturally, the rules concerning fire detection are many and elaborate. Here are some golden rules:

  • Detectors should not be placed closer to a wall than 0.5 m.
  • If circumstances permit it, detectors should be placed at least 1 meter away from air-conditioning inlets or ventilation.
  • Stairwells should always be equipped with detectors on the top floor. Additionally, there should be detectors on at least every third floor.

For details, see the Norwegian Standard NS 3960: 2013 Fire alarm systems design, installation, operation and maintenance.



All our detectors are equipped with DYFI+ filters providing better and faster detection with fewer unwanted alarms. 

  • The transient filter recognizes phenomena not related to a real fire, such as steam and cigarette smoke.
  • The pollution filter automatically and individually maintains the chosen sensitivity during the entire life cycle of the detector.
  • The smouldering filter provides accurate and rapid detection in the event of smouldering fires.

Optical smoke detectors

The standard detector in most areas. It has an optical chamber with a light source that is reflected towards a light sensitive receiver. In the event of smoke supply, light reflection will increase, and the detector will go into alarm.

Heat detectors

Heat detectors are used in rooms where smoke detectors are unsuitable, for example, where smoke normally occurs. The heat detector reacts when the temperature sensor in the detector reaches a certain temperature. The detector can either react if the temperature reaches a certain level, or by rapid temperature rise over a given period.

MultiSensors

MultiSensors are a combination of heat and smoke detectors, and can be used where there is danger of flaming fires, such as in kitchens. They can also be used as pure heat detectors by disconnecting the smoke part during periods when smoke will occur.