Patent ID: 9691258
Date: 2017-06-27
CPC Classifications: F24F,G01J,G01N,G01V,G06K,G06T,G08B,H04L,H04M,H04N,H05B,Y02A,Y02B

Claim:
1. A method for detecting that a hazardous condition is easing, the method comprising: measuring, by a hazard detector, a first amount of the hazardous condition present in an ambient environment of the hazard detector; setting, by the hazard detector, a mode of the hazard detector to a pre-alarm state based on the measured first amount of the hazardous condition; measuring, by the hazard detector, a second amount of the hazardous condition present in the ambient environment of the hazard detector, wherein the second amount is less than the first amount; determining, by the hazard detector, based on the second amount of the hazardous condition present in the ambient environment, to set the mode to a non-alarm state; and in response to determining, at least partially based on the second amount of the hazardous condition present in the ambient environment to set the mode of the hazard detector to the non-alarm state from the pre-alarm state or an alarm state, outputting an indication that the hazardous condition has eased, wherein: