ABSTRACT
An automatic fire detection and alarm system (AFDAS) is one of the fundamental elements in the overall fire protection of any facility or plant. An AFDAS can help limit fire losses, indicating loss of life, in buildings of all occupancies. AFDAS may be extremely simple, as typified by a fusible link release system for dry-chemical protection in a cooking hood or for the release of an automatic smoke and heat vent. AFDAS are traditionally classified by the method of transmission of a remote alarm and the nature of the individuals or equipment to which the alarm is transmitted. Automatic fire detection devices are one of the key detecting and initiating components of a AFDAS. There is a wide variety of detection devices that are actuated by the elements of a fire, most common being heat, smoke, and light radiation. Fire gas sensing detectors normally use the semiconductor principle or the catalytic element principle to detect combustible gases during a fire.
