How heat Heat Detectors works
> Heat detectors works by measuring temperature range
> If the temperature increases beyond particular range it gives alarm
> Commonly two type of heat detectors are Fixed type heat detectors and Rate of rise heat detectors
Must Read > SOLAS Regulation of fire Detection System
Fixed type heat detectors
As name indicates fixed type heat detectors operate when the ambient temperature increases sufficiently to predetermined level where the heat detector will operate
Rate of rise heat detectors
A rate-of-rise heat detector operates when the ambient temperature increases over time equal to or greater than the rate of change the detector was manufactured to operate.
Most common type heat detector is
Fusible link electro mechanic heat detector
> An eutectic alloy is a mixture of two or more metals whose melting point is at a lower temperature than the individual metal.
> When the ambient temperature increases to the eutectic temperature, the alloy changes state from a solid to a liquid, like solder.
> This enables a spring held under pressure to release and make an electrical circuit to actuate an alarm.
> Both Fixed type heat detectors and Rate of rise heat detectors are working under this principle.