Warning apparatus with a line integrity supervisory circuit

Details Warning apparatus with a line integrity supervisory circuit Warning apparatus with a line integrity supervisory circuit

1977-10-20

1980-03-04

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

With particular system function

340652, G08B 2100

Patent

active

041919467

ABSTRACT:
Warning apparatus for detecting abnormal conditions, such as fire or smoke, comprises a two-conductor electrical transmission line with detectors connected across the line at spaced locations. Unfiltered rectified AC power is supplied to the input of the line, and a filter capacitor is connected across the end of the line beyond the detectors to produce a filtered DC voltage in the line. An open line, excessive line resistance, short-circuit across the line, or deterioration of the end-of-line capacitor will give rise to excessive ripple at the input end which is sensed by a supervisory circuit to indicate a trouble condition on the line. The supervisory circuit also limits maximum line current.

REFERENCES:
patent: 2684475 (1954-07-01), Lode
patent: 3599206 (1971-08-01), McLeod
patent: 3603973 (1971-09-01), Hough
patent: 3665461 (1972-05-01), Gnagi et al.
patent: 3821734 (1974-06-01), Meier et al.
patent: 3978461 (1976-08-01), DeLime

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