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消防警报器是一种装在建筑物内或特定地方的警报器,以在火灾可能发生时警告,使人们可即时应变,进而降低生命、财产的损失。消防警报器有很多种类,最常见的为声光报警器,其动作原理为当探测器电离烟雾探测器红外感烟火灾探测器、感温火灾探测器、火警侦测器火警探测器烟雾侦测器烟雾探测器火灾警报器火警闪灯火警受信总机等)动作时向火灾报警主机传送报警信号,火灾报警主机随即给声光报警器传输信号,声光报警器开始蜂鸣及闪光。某些种类的火灾警报器则可自己发出蜂鸣或闪光。

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