Fiber Optic Linear Heat Detection (LHD) uses one, single passive fiber optic cable (with an average diameter of 4 mm) as a linear temperature sensor over a length of up to 16 km per channel. The result is a continuous temperature profile along the entire length of the sensor cable, providing gapless monitoring and complete asset coverage. Unlike conventional fire detection systems, fiber optic LHD detects and locates fires quickly and precisely, tracking fire size and spread direction regardless of air currents. LHD enables early identification of rate of heat rise, and therefore detects heat abnormalities earlier than other technologies, nevertheless is easy to integrate into existing fire detection systems. Our system has a very low false alarm rate, with the industry’s most complete set of certifications (VdS EN 54-22, UL521, ULC S530, FM 3210, ATEX/IECEX, KFI, CCC, SIL2). It is well suited for hazardous environments and the sensor cable can withstand temperatures up to 750 °C without losing monitoring capabilities.