FIRE SENSOR, FIRE WARNING RECEIVER, FIRE WARNING RECEPTION SYSTEM USING THEM

摘要

PROBLEM TO BE SOLVED: To automatically perform the test operation of all fire sensors connected to a monitor line without using a multiplex transmission system. SOLUTION: This sensor 1 is connected to a monitor line L led out from a fire receiver and is a fire sensor which makes a switching element 2, which is connected to the monitor line L, conductive to keep the short-circuit at the time of the occurrence if a fire. A test signal discrimination means 3 which discriminates a test signal transmitted from the fire receiver through the monitor line L, a timer means 4 which sets the timing time of a test alarm, and an alarm control means 5 which makes the switching element 2 conductive to give a test alarm at the time of time-up of the timer means 4 after the reception of the test signal are provided.