Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1976-12-14
1979-02-06
Yusko, Donald J.
Communications: electrical
Condition responsive indicating system
With particular system function
250381, 340629, 340636, 340693, G08B 1710
Patent
active
041386647
ABSTRACT:
An improved warning device having a sensor responsive to predetermined phenomena to generate a signal which changes in value upon the presence of the phenomena, and means for comparing the signal with a reference potential and for generating an indication upon a predetermined difference therebetween, is characterized by integrated circuit components which may economically be manufactured and assembled, and which maintain substantially constant the sensitivity of the device to the phenomena despite changes in the level of power supplied thereto. Where the warning device is a battery powered fire detector, the phenomena to be sensed is products of combustion, circuitry supervises the power level of the battery, and means are provided for readily testing the entire combustion detecting and indication generating portion of the detector, whereby a user of the detector may be assured of proper operation of the detector in response to combustion. The power supplied to the detector by the battery is unregulated, yet the sensitivity of the detector to combustion remains essentially constant despite a decreasing battery voltage with depletion thereof.
REFERENCES:
patent: 2795904 (1974-03-01), Beyersdorf et al.
patent: 3500368 (1970-03-01), Abe
patent: 3594751 (1971-07-01), Ogden et al.
patent: 3798625 (1974-03-01), McMillian et al.
patent: 3944859 (1976-03-01), Hoover
patent: 3956643 (1976-05-01), Hite
Conforti Frederick J.
Schneider Quentin L.
Schwarzbach Richard J.
Myer Daniel
Pittway Corporation
Yusko Donald J.
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