US 12,293,651 B2
Self-testing fire sensing device for confirming a fire
Kamal Raja Ganesan, Chennai (IN); and Barath Murugavel, Bangalore (IN)
Assigned to Honeywell International Inc., Charlotte, NC (US)
Filed by Honeywell International Inc., Charlotte, NC (US)
Filed on Dec. 19, 2023, as Appl. No. 18/544,751.
Application 18/544,751 is a continuation of application No. 17/729,434, filed on Apr. 26, 2022, granted, now 11,900,791.
Prior Publication US 2024/0161600 A1, May 16, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G08B 29/04 (2006.01); G08B 17/06 (2006.01); G08B 17/107 (2006.01); G08B 29/10 (2006.01); G08B 29/18 (2006.01); G08B 29/20 (2006.01)
CPC G08B 29/043 (2013.01) [G08B 17/06 (2013.01); G08B 17/107 (2013.01); G08B 29/18 (2013.01); G08B 29/20 (2013.01); G08B 29/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A self-testing fire sensing device, comprising:
a variable airflow generator;
an optical scatter chamber configured to measure a quantity of any dust or smoke particles therein prior to the variable airflow generator activating; and
a controller configured to:
compare the measured quantity to a baseline quantity; and
transmit a command to the variable airflow generator responsive to the measured quantity being greater than the baseline quantity; and
wherein the variable airflow generator is configured to activate 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; and
wherein the controller is configured to:
compare the quantity of smoke particles to the baseline quantity; and
report a confirmed fire responsive to the quantity of smoke particles being greater than the baseline quantity.