Heat detectors are the oldest type of automatic fire detection devices. They are the least expensive of detectors and have the lowest false alarm rate of all automatic detection devices, they are slowest in detecting fires.
Heat detectors are best suited for fire detection in a small confined space where rapidly building high output fires are expected, in areas where ambient conditions would not allow the use of other devices, or where speed of detection is not a prime consideration.
Heat detectors respond when the detecting element reaches either a pre-determined fixed temperature or a specified rate of temperature (12-15 degrees per minute) rise occurs. (Some installations include a combination.)
FPT 102 - Fire Prevention and Inspection // Instructor: Kevin M. Kolb Slide #7