Understanding Linear Heat Detectors

Linear heat detectors operate on the fundamental principle of detecting temperature changes along a continuous cable length. These cables are designed with a heat-sensitive element that reacts to increases in temperature, triggering an alarm when a predefined threshold is surpassed. Linear heat detectors are typically wired directly into a fire alarm control panel (FACP) or a fire detection and suppression system, allowing them to communicate with the panel and trigger appropriate responses in case of a temperature increase or fire hazard. The detection technology can be broadly classified into two main types: digital and analogue.

Digital Linear Heat Detectors

Digital linear heat detectors operate on a binary principle—either triggered or not triggered. These detectors are characterised by discrete zones, each with its own set temperature threshold. Digital detectors are often used in environments where distinct zones or areas require individualised temperature monitoring.

Analogue Linear Heat Detectors

Analogue linear heat detectors provide a more granular approach to temperature sensing. Unlike digital detectors, analogue variants can monitor temperature changes continuously along the entire length of the cable. This allows for a more precise identification of the location and severity of a temperature increase. Analogue detectors are commonly employed when a more nuanced understanding of the thermal environment is crucial.