Condition monitoring apparatus

Details Condition monitoring apparatus Condition monitoring apparatus

1974-10-01

1976-10-05

Caldwell, John W.

Communications: electrical

Systems

Call station

331113R, 340326, 340327, G08B 2500, H04Q 900

Patent

active

039848256

ABSTRACT:
Alarm apparatus for providing a distinctive indication of an alarm condition and comprising a visual alarm device such as a signal lamp and also an aural indication device comprising either a bell or buzzer. In response to an alarm input, an astable multivibrator is operated to a condition where it alternately provides respectively opposite outputs at its two output terminals. In response thereto, the lamp is intermittently energized to provide a flashing signal output, and the buzzer or bell is energized to provide a distinctive alarm signal. An acknowledge push button is also provided which, when actuated in response to an alarm indication, operates the astable multivibrator to a further condition in which both outputs of the multivibrator assume the same output condition, and in response to this the lamp becomes steadily energized and the bell or buzzer becomes deenergized.

REFERENCES:
patent: 3136982 (1964-06-01), Sargent
patent: 3525988 (1970-08-01), Linder
patent: 3529305 (1970-09-01), Hardin
patent: 3623048 (1971-11-01), Haddock
patent: 3680068 (1972-07-01), Hanchett
patent: 3810149 (1974-05-01), Miller et al.
patent: 3829830 (1974-08-01), Scarpino

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