Multiple operating alarm systems employing oil burner flame moni

Details Multiple operating alarm systems employing oil burner flame moni Multiple operating alarm systems employing oil burner flame moni

1974-11-29

1976-06-15

Caldwell, John W.

Communications: electrical

Systems

Call station

25015, 340227R, 340228R, 34019, 34020, 43179, G01D 2104, G08B 1310

Patent

active

039640442

ABSTRACT:
An alarm system uses a series string of sensors including burglar, fire and cold detectors in series with a relay coil. The coil when activated, assures that all sensors are indicating a no fault condition and a contact associated with the coil, energizes a source of light to illuminate a photo detector. Upon an intrusion, the coil is energized causing an alarm to activate, which alarm may cause another alarm to continue warning of a fault in spite of a predetermined reset condition, which may undesirably occur.
Other embodiments show a technique of monitoring a plurality of secured locations to determine the exact one experiencing a fault.

REFERENCES:
patent: 3430052 (1969-02-01), Stephan
patent: 3540043 (1970-11-01), Crosthwait

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