Patent ID: 7019657

Claim:
A method for detecting and indicating the presence of combustion products for triggering an alarm comprising the steps of: a. monitoring for the presence of a combustion gas and quantifying the combustion gas; b. monitoring for the presence of an air borne particulate matter and quantifying the air borne particulate matter; c. measuring an ambient temperature and a quantifying a change in the ambient temperature; d. determining if a first alarm condition has been satisfied, said first alarm condition being the quantified presence of the combustion gas exceeding a threshold combustion gas level and the quantified presence of the air borne particulate matter exceeding a first threshold air borne particulate matter level; e. determining if a second alarm condition has been satisfied, said second alarm condition being the quantified presence of the air borne particulate matter exceeding a second threshold air borne particulate matter level, said second air borne particulate matter threshold being greater than said first air borne particulate matter threshold; f. determining if a third alarm condition has been satisfied, said third alarm condition being the quantified change in the ambient temperature exceeding a threshold temperature change level; g. triggering an alarm when at least one of said first, second and third alarm conditions has been satisfied.