Fire detection and fire alarm systems - Part 22: Resettable line-type heat detectors

This document establishes specific technical requirements and test methods for a particular type of fire detection equipment known as a resettable linear heat detector. These devices are integral components within broader fire alarm and detection systems, designed to monitor large areas continuously by sensing temperature variations along a continuous sensing element. Unlike point-type detectors that respond to heat at a single location, the technology described herein utilizes a distributed sensing capability, often implemented through cables or other linear configurations. The standard defines the necessary performance criteria to ensure reliability and accuracy during operation, as well as methods to verify that the detection mechanism can be reset after an alarm condition has been cleared. It addresses safety and functional aspects essential for integration into building protection infrastructure, focusing on how the device responds to rising temperatures and how it maintains operational integrity under various environmental conditions. The content outlines the procedures for type testing and routine checks required to confirm compliance with the established specifications for this specialized category of fire detection technology.