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A Heat Detector is a fire alarm device that starts when a fire's swirling thermal energy raises the temperature of a heat-sensitive element. The rate of heat flow into the element is limited by the thermal mass and conductivity of the element. This thermal lag is found in all heat detectors. Heat is generated to melt the fuse plug metal and the compressed air line will experience an abrupt pressure decrease as the air is released by the plug after it has melted. The sensor detects the drop in pressure and sends out a signal for warnings and post-fire confirmation