Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1983-04-15
1985-09-03
Rowland, James L.
Communications: electrical
Condition responsive indicating system
With particular system function
250574, 340630, 356338, G08B 2900, G08B 1710
Patent
active
045395560
ABSTRACT:
A battery-powered photoelectric smoke detector periodically samples the air in a smoke chamber. A manually-operated test button is provided for simulating smoke to test the device. The sampling frequency is determined by a first resistance. A frequency changing circuit includes a test switch, the movable contact of which is coupled to the test button and is responsive to operation thereof for connecting it parallel with the first resistance the series combination of a diode and a second resistance for increasing the sampling frequency. Means are provided for back-biasing the diode to disable the frequency changing circuit when the detector detects smoke.
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Dederich Stanley S.
Koster William M.
Schoenfelder George A.
Myer Daniel
Pittway Corporation
Rowland James L.
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