Apparatus for detecting changes in the electrical characteristic

Details Apparatus for detecting changes in the electrical characteristic Apparatus for detecting changes in the electrical characteristic

1975-01-23

1976-08-03

Waring, Alvin H.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340227R, 340248E, 340421, G08B 1900

Patent

active

039732576

ABSTRACT:
The invention relates to electrical apparatus for detecting a change in the electrical characteristics of a sensor device, such as a device for sensing fire, the apparatus comprising a plurality of electrical circuits arranged in parallel and connected to an output circuit which can activate or initiate operation of a device which is required to be operated when the electrical characteristics of the sensor device change, each parallel circuit being provided with means for automatically indicating that the circuit is functioning correctly, any fault in the circuit being automatically indicated and the circuit preventing the output circuit from activating or initiating operation of said device due to a fault.

REFERENCES:
patent: 3686531 (1972-08-01), Decker et al.
patent: 3829849 (1974-08-01), Stauffer

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