Fire alarm system comprising a plurality of alarms which may be

Details Fire alarm system comprising a plurality of alarms which may be Fire alarm system comprising a plurality of alarms which may be

1977-08-04

1979-07-24

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

With particular system function

340584, 340628, G08B 1700

Patent

active

041624890

ABSTRACT:
A fire alarm system comprises a plurality of alarms which may be operated via an alarm loop and which, being subject to selective interrogation, each alarm transmits an analog value of a particular characteristic of a fire to a central control, the analog value being tapped from a detector for that characteristic. Each alarm comprises an alarm circuit which has a load resistor which can be connected in parallel to the alarm loop by means of a timing element and which amplifies the current which characterizes the alarm at the instant of interrogation.

REFERENCES:
patent: 3214734 (1965-10-01), Whitehead
patent: 3482243 (1969-12-01), Buchsbaum
patent: 3676877 (1972-07-01), Kobayashi
patent: 3733596 (1973-05-01), Prima
patent: 3753258 (1973-08-01), Honda
patent: 3797008 (1974-03-01), Yuasa
patent: 3832678 (1974-08-01), Gysell et al.
patent: 3932858 (1976-01-01), Smith et al.

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