Fire alarm system

Details Fire alarm system Fire alarm system

1983-02-03

1986-02-04

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

340508, G08B 1700

Patent

active

045689237

ABSTRACT:
There is disclosed a fire alarm system wherein a plurality of fire detectors are connected to each alarm line and a light emission diode is connected in series between an alarm line and an electric source, said light emission diode indicating the actuation of any of the fire detectors, said system being capable of monitoring the alarm lines for breakage or disconnection without interruption of its fire monitoring function. This fire alarm system comprises a pulse oscillator; a switching circuit; a voltage detection circuit; two light emission diodes; a delay circuit; means for forcibly turning on the switching circuit; a capacitor; and a high resistance resistor. This fire alarm system is so constructed that the breakage or disconnection of an alarm line is indicated by the on-and-off flashing of one light emission diode, that the occurrence of a fire is indicated by the continuous glow of the two light emission diodes, and that extinguishment of the fire is indicated by the putting out of one of the two light emission diodes.

REFERENCES:
patent: 2684475 (1954-07-01), Lode
patent: 3832678 (1974-08-01), Gysell et al.
patent: 4247848 (1981-01-01), Kitta et al.

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