US 11,749,097 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 Feb. 24, 2021, as Appl. No. 17/184,056.
Application 17/184,056 is a continuation of application No. 16/552,301, filed on Aug. 27, 2019, granted, now 11,132,891.
Prior Publication US 2021/0183232 A1, Jun. 17, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G08B 17/107 (2006.01); G08B 29/14 (2006.01); G08B 17/117 (2006.01)
CPC G08B 29/145 (2013.01) [G08B 17/107 (2013.01); G08B 17/117 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A self-testing fire sensing device, comprising:
a gas source configured to release one or more gases at a gas level sufficient to trigger a fire response; and
a gas sensor, including a microcontroller having a memory and a processor, configured to:
measure a gas level of the one or more gases in the self-testing fire sensing device upon the gas source releasing the one or more gases;
determine an airflow rate based on a change in the measured gas level over time; and
determine whether the self-testing fire sensing device is functioning properly based on the airflow rate.