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In the system of Fire and Explosion Protection,the system components dealing with detection & alarm of fires and explosions and susequent response action are the most important. Protection of life and prevention of property damage greatly depend on the efficient and fast detection and response action at the earliest stage of Fire and Explosion,i.e.at initiation and growth stage,when the fire is small in size and can be relatively easily extinguished. It can be observed that properly designed,installed,operated and maintained fire and explosion detection and alarm systems have eliminated fire losses on a number of incidents in the past.Expenditure needed for installing such automatic detection systems in industrial and residential premises are really quite minor in comparison with the huge benefits they provide. The best and most universal fire detector is man himself.Human beings possess senses which can detect all principal combustion products. Flames and smoke can be seen by the eyes,heat can be felt by touch,and gases can be smelled through the nose.However,there are many situations and places where people are not,or cannot always be present.In such cases,it is necessary to use automatic fire detectors. Fire detectors are classified according to fire phenomina,into mainly four types viz. 1) Smoke detectors 2)Gas detectors 3)Heat detectors and 4) Radiation detectors
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