Detector system

Details Detector system Detector system

1973-12-12

1976-10-26

Swann, III, Glen R.

Communications: electrical

Systems

Call station

250339, 250554, 340248A, 340409, G08B 1712

Patent

active

039887251

ABSTRACT:
A detector system particularly adapted for use in installation where the supply voltage is subject to wide variations comprises a detector which produces a voltage in response to a condition to be detected, a supervisory circuit, and an alarm actuator, in which the voltage signal produced by the detector when the predetermined condition exists, varies in proportion to line voltage, the alarm actuating means produces an alarm when the input signal rises to a predetermined percentage of the line voltage, and the supervisory circuit applies to the signal lead a supervisory voltage which also varies in proportion to the variation of line voltage.

REFERENCES:
patent: 2901740 (1959-08-01), Cutsogeorge
patent: 3550120 (1970-12-01), Kompelien
patent: 3801972 (1974-04-01), Kim et al.

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