Particle detector with dust rejection
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United States of America Patent
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Oct 31, 2017
Grant Date -
Jul 17, 2014
app pub date -
Jun 21, 2012
filing date -
Jun 22, 2011
priority date (Note) -
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Abstract
A system and method of reducing the incidence of false alarms attributable to dust in smoke detection apparatus. The method includes obtaining at least two sample air flows, subjecting a first airflow to particle reduction and measuring the level of particles in the first airflow and generating a first signal indicative of the intensity. The method also includes measuring the level of particles in the second airflow and generating a second signal indicative of the intensity. The first signal is compared to a predetermined alarm level and, if the alarm level is achieved, the first and second signals are subsequently compared and an output signal is generated based on the relative difference between the first and second signals.
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