Method and apparatus for monitoring an alarm system

Details Method and apparatus for monitoring an alarm system Method and apparatus for monitoring an alarm system

1982-05-05

1985-09-24

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340511, 340518, 340661, G08B 2900

Patent

active

045435650

ABSTRACT:
A method and apparatus for monitoring an alarm system such as a fire alarm system having a plurality of alarms connected to a central station determine the amount of departure of measured alarm values from a rated quiescent value and calculate a fluctuation value therefrom, the fluctuation value then being compared at selected time intervals with a rated limiting value. If the result of the comparison shows that the fluctuation value is less than the rated limiting value, a malfunction signal is displayed.

REFERENCES:
patent: 4222041 (1980-09-01), Von Tomkewitsch et al.
patent: 4263583 (1981-04-01), Wyckoff
patent: 4283717 (1981-08-01), Caldwell et al.
patent: 4313114 (1982-01-01), Lee et al.

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