火灾形成来自于物质燃烧，其初期伴有烟雾、热量，同时产生光。消防电源监控系统基于此原理，通过观察是否存在粉尘烟雾、温度的高低，进行对火灾的预警。

Fire comes from material combustion, which is accompanied by smoke, heat, and light. Fire power monitoring system based on this principle, by observing the presence of dust, smoke, temperature, fire warning.

在消防报警系统中，火灾探测器是火灾自动报警装置的最关键的检测部件，它好像是火灾自动报警及控制系统的“眼睛”，将火灾发生初期所产生的热、烟及光转换为电信号，当其电信号幅值超过某一定值时，传递给相关的报警控制设备产生报警。电气火灾探测器的功能就是探测火灾初期燃烧的信号，并把火灾信号传递给火警控制器。火灾探测器根据其探测原理及功能分成以下类型：感烟探测器、感光探测器、感温探测器、复合型探测器、可燃气体探测器。

In the fire alarm system, fire detector is the key component of automatic fire alarm detection, as if it is automatic fire alarm and control system of the "eyes", the fire occurred early produced by heat, smoke and light into electrical signals, when the signal amplitude exceeds a certain value, transfer give relevant alarm alarm control equipment. The function of the electric fire detector is to detect the signal of burning in the early stage of fire, and transmit the fire signal to the fire alarm controller. Fire detectors are divided into the following types according to their detection principle and function: smoke detectors, detectors, temperature detectors, composite detectors, flammable gas detectors.

火灾涉及人类生命与财产，而火灾自动报警信号都是由火灾探测器发出的，因此，火灾探测器的性能，包括可靠件、稳定性从灵敏度都直接关系到整个消防系统的运行。

The fire relates to human life and property, and automatic fire alarm signal is issued by the fire detector, therefore, the performance of fire detectors, including reliability and stability from sensitivity are directly related to the fire protection system operation.