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Commencing coutdown: the alarm sequence for total flood extinguishing system is governed by European and international standards. Here we review an installation where programmable sounders were interfaced with the extinguishing panel to provide a clear and manageable solution.

Publication: Fire Safety Engineering
Publication Date: 01-FEB-08 		Format: Online
Delivery: Immediate Online Access

Article Excerpt
[ILLUSTRATION OMITTED]

THE ALARM SEQUENCE REQUIRED FOR GASEOUS, TOTAL-FLOODING FIRE extinguishing systems is prescribed in British, European and International standards. The sequence typically has four stages: the first indicates that a single detector has operated, and that action is required; the second stage indicates that two or more detectors have operated and is known as 'coincidence' alarm, confirming the fire and that the extinguishing system discharge is imminent (normally comprising a pulsing tone. A third stage, with a different frequency of pulse, is effected when someone has operated a hold button to delay the gas discharge--hold buttons being necessary if the system is to be left in the 'automatic' mode while the protected area is occupied. The fourth stage, with a constant tone, confirms that...

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