Linear heat detection (LHD) is a fire detection technology that utilises a specialised cable to detect and locate heat along its entire length, which can be over a kilometre.
Unlike traditional point detectors, which sense heat in a specific area, linear heat detection cables can cover long distances and provide continuous monitoring.
The cable consists of heat-sensitive elements that trigger an alarm when a certain temperature threshold is reached or when a rate-of-rise in temperature is detected.
This allows for early detection of fire or overheating conditions, making linear heat detection particularly useful in environments where rapid fire detection is crucial, such as tunnels, conveyor belts, cable trays, and storage areas.
It offers flexibility in installation and can be tailored to fit various applications, providing reliable and effective fire detection solutions.
Linear heat detection is also sometimes known as Heat Sensing Cable, Line Type Heat Detector or Linear Heat Sensing cable.
Non-resettable line type heat detectors
This term refers to linear heat detectors that cannot be ‘reset’ (i.e reused) after an alarm event. Instead the affected area must be replaced. These are sometimes called Digital or Fixed Temperature Heat Detectors.
Signaline has two forms of non-resettable line type heat detectors. For European markets we offer the Signaline FT-EN which is approved to EN54 part 28. For global markets we offer the Signaline FT range which is approved to UL and FM.
Resettable line type heat detectors
This term refers to linear heat detectors that can be ‘reset’ (i.e reused) after an alarm event. These are also called analogue linear heat detectors.
Our resettable line type heat detector range is called Signaline HD.