Method and warning alarm device, smoke detector in particular
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Issued Date -
Oct 29, 2009
app pub date -
Mar 18, 2009
filing date -
Mar 19, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method for testing the free entrance of gas into a measuring cavity of a warning alarm device via at least one opening, wherein an acoustic signal is generated in the measuring cavity and the change of the resonance behaviour of the measuring cavity is measured in order to emit an error signal when the resonance behaviour has changed in a measurable degree, wherein the number of the oscillations of the acoustic signal is measured after the termination of the acoustic signal, and is compared with a preset value.
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