Self-diagnostic smoke detector

Details Self-diagnostic smoke detector Self-diagnostic smoke detector

G - Physics

08

B

G08B 29/00 (2006.01) G08B 29/14 (2006.01) G08B 29/18 (2006.01)

Patent

CA 2174175

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) increasing the background signal by a gain factor to produce a first test signal; b) comparing the first test signal against an alarm threshold signal; c) reducing the background signal by a reduction factor to produce a reduced background signal; d) increasing the reduced background signal by a gain factor to produce a second test signal; and e) comparing the second test signal against the alarm threshold signal. The alarm unit 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. The present invention also provides a method for maintaining an alarm circuit within its sensitivity range, the alarm circuit including an emitter and a detector and having a background signal and a preset alarm threshold signal. The method involves a) increasing the background signal by a gain factor to produce a first test signal; b) comparing the first test signal against an alarm threshold signal; c) reducing the background signal by a reduction factor to produce a reduced background signal; d) increasing the reduced background signal by a gain factor to produce a second test signal; e) comparing the second test signal against the alarm threshold signal; and f) adjusting the emitter output and/or the alarm threshold signal if necessary to maintain the first test signal greater than or equal to the alarm threshold signal and the second test signal less than or equal to the alarm threshold signal.

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