| 摘要 |
PROBLEM TO BE SOLVED: To provide an automatic fire alarm system for issuing an alarm with configurations suitable for the status of the progress of a fire.SOLUTION: A sensor 21 and a transmitter 22 are set such that a resistance value of a conduction passage is made different when a sensor line 2 is short-circuited in the case of an alarm. A receiver 1 includes a classification determination unit 14 for determining the alarm classification of the sensor 21 and the transmitter 22 on the basis of the alarm voltage of the sensor line 2. When the alarm source is the sensor 21, a fire is determined in accordance with a predetermined accumulating operation, and then an acoustic device 31 in a corresponding district is rung, and when the fire source is the transmitter 22, the acoustic devices 31 of a whole building are simultaneously rung on the basis of the determination result of the classification determination unit 14. |
