US 12,260,740 B2
Self-testing fire sensing device
Christopher Dearden, Melton Mowbray (GB); Michael Barson, Nuneaton (GB); and Benjamin Wolf, Leicester (GB)
Assigned to Honeywell International Inc., Charlotte, NC (US)
Filed by Honeywell International Inc., Charlotte, NC (US)
Filed on Sep. 1, 2023, as Appl. No. 18/241,282.
Application 18/241,282 is a division of application No. 17/184,056, filed on Feb. 24, 2021, granted, now 11,749,097.
Application 17/184,056 is a continuation of application No. 16/552,301, filed on Aug. 27, 2019, granted, now 11,132,891, issued on Sep. 28, 2021.
Prior Publication US 2024/0038054 A1, Feb. 1, 2024
Int. Cl. G08B 29/14 (2006.01); G08B 17/107 (2006.01); G08B 17/117 (2006.01)
CPC G08B 29/145 (2013.01) [G08B 17/107 (2013.01); G08B 17/117 (2013.01)] 20 Claims
OG exemplary drawing
 
17. A fire alarm system, comprising:
a self-testing fire sensing device configured to:
generate heat using a heat source;
measure a rate of reduction in a temperature in the self-testing fire sensing device using a heat sensor; and
determine an airflow rate in the self-testing fire sensing device based on the measured rate of reduction in the temperature; and
a monitoring device, including a microcontroller comprising a memory and a processor, configured to:
receive the determined airflow rate; and
determine the self-testing fire sensing device is functioning properly responsive to the airflow rate exceeding a threshold airflow rate.