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The purpose of a fire alarm system is to provide an early warning of fire so that people can be evacuated and immediate action can be taken to stop the fire as soon as possible-all according to the predetermined plan.
Alarm will be raised automatically by smoke or heat detectors, to ensure an alarm is dealt in an orderly manner, it is important to know where the alarm is coming from. To aid this function, fire alarm systems are usually split into zones, each covering a different area of a building.
When an alarm has been raised, the fire alarm panel responds by indicating the zone in which the alarm has occurred and activates the relevant sounders, bells and other alarm outputs to provide a warning of the fire. Overall descriptions about the major components used in fire alarm system are as follows.
Sensor
sensor are described as the brain of fire alarm system as they sense the smoke or heat released during fire and triggers the hooter to produce the alerting sound. Since large quantities of solid particles are released soon after the ignition, earliest detection must be ensured in order to take the preventive measures.
This is possible by using ionization smoke detectors or optical smoke detectors