Patent ID: 11900791
Assignee: HONEYWELL INTERNATIONAL INC.
Field: Control (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A self-testing fire sensing device, comprising:
a fan;
an optical scatter chamber configured to measure a quantity of any dust or smoke particles therein prior to the fan activating; and
a controller configured to:
compare the measured quantity to a baseline quantity; and
transmit a command to the fan responsive to the measured quantity being greater than the baseline quantity; and

wherein the fan is configured to activate for a particular period of time to remove any dust or smoke particles from the optical scatter chamber responsive to receiving the command;
wherein the optical scatter chamber is configured to measure a quantity of smoke particles therein after the particular period of time; and
wherein the controller is configured to:
compare the quantity of smoke particles after the particular period of time to the baseline quantity; and
report a confirmed fire responsive to the quantity of smoke particles after the particular period of time being greater than the baseline quantity.