Fire Alarm System heat detector

heat detector

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Fixed temperature heat detector

A heat detector is a fire alarm device designed to respond when the convected thermal energy of a fire increases the temperature of a heat sensitive element. The thermal mass and conductivity of the element regulate the rate flow of heat into the element. All heat detectors have this thermal lag

How does a heat detector alarm work

Heat sensors trigger an alarm by either melting a low fusing alloy or bending a bimetallic strip

Depending on its construction, aheat sensor alarm can be electronic or mechanical (mechanical alarms, in their turn, can be pneumatic or bi-metallic). An electronic heat detector alarm contains a thermistor which changes resistance as the temperature increases