Fire Alarm Expert: Advancements in Linear Heat Detection Technology

The oldest form of electrical fire detection is the heat detector. Over the years, these devices have had many improvements in their design and operation. The basic method of heat detection still uses a fusible link developed to respond to a specific...

Greg Kessinger, SET, CFPS, can be reached at or



Basic Construction of Linear Sensing

1. Various outer jackets suitable for different environmental conditions
2. Material ‘wrap’ which provides additional protection for the inner conductors of the detector
3. Heat-sensitive polymer which coats the inner conductors
4. A twisted pair of steel conductors to comprise the core