Danger alarm system

Details Danger alarm system Danger alarm system

1979-04-12

1980-09-09

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

With particular system function

340505, 340506, G08B 2900

Patent

active

042220416

ABSTRACT:
A danger alarm system, for example, fire alarm system, utilizing a plurality of detectors which are connected to a central exchange over respective call circuits, the central exchange is provided with a memory in which characteristic data for each connectable detector can be stored. Data is cyclically sampled from the respective individual detectors and simultaneously therewith rated values for the corresponding detector are formed from the stored data and compared with the sampled data and, if necessary, alarm or trouble signals are derived from the comparison results.

REFERENCES:
patent: 4067008 (1978-01-01), Sprowls

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