Self-diagnostic smoke detector

Details Self-diagnostic smoke detector Self-diagnostic smoke detector

1995-04-13

1996-06-04

Swarthout, Brent A.

Communications: electrical

Condition responsive indicating system

Specific condition

340628, 250205, 250574, 356338, 356438, G08B 17107

Patent

active

055237436

ABSTRACT:
The present invention provides a method for detecting whether an alarm circuit is operating outside its sensitivity range, the alarm circuit having a background signal and a preset alarm threshold signal. The method involves: a) multiplying the background signal by a first gain factor to produce a first test signal; b) comparing the first test signal against an alarm threshold signal; c) multiplying the background signal by a second gain factor less than the first gain factor to produce a second test signal; and d) comparing the second test signal against the alarm threshold signal. The alarm circuit is operating outside its sensitivity range when the first test signal is less than the alarm threshold signal or the second test signal is greater than the alarm threshold signal.

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