Heat Sensor Alarm

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System Sensor 2151T - Photoelectric Smoke and Fixed Heat Detector - Alarm Grid

System Sensor 4WT-B - 4-Wire Smoke Detector with 135°F Fixed Heat Sensor - Alarm Grid

Aico EI144E 240V Mains Powered Heat Detector Alarm with 9V Alka- Go Sparky

Heat Detector For Garage, Fire Alarm Heat Detector

Edwards EST (SIGA-HRD) Fixed Temp Heat Detector

Butler Supply, Kidde, HD135F

120VAC Wire In Heat Alarm HD135

Heat / Temperature Sensor Alarm using NE555

How Heat Alarms Work - Safelincs