US 12,424,069 B2
Fire sensing device
Benjamin H. Wolf, Leicester (GB); Daniel D. Ascough, Ilkeston (GB); Michael Barson, Nuneaton (GB); and Christopher Dearden, Melton Mowbray (GB)
Assigned to Honeywell International Inc., Charlotte, NC (US)
Filed by Honeywell International Inc., Charlotte, NC (US)
Filed on May 31, 2023, as Appl. No. 18/203,802.
Prior Publication US 2024/0404383 A1, Dec. 5, 2024
Int. Cl. G08B 17/107 (2006.01); G08B 29/04 (2006.01)
CPC G08B 17/107 (2013.01) [G08B 29/043 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A fire sensing device, comprising:
a first transmitter light-emitting diode (LED) configured to emit a first light;
a second transmitter LED configured to emit a second light;
a controller configured to command the first transmitter LED to cease emitting the first light and the second transmitter LED to start emitting the second light; and
a photodiode configured to:
detect a scatter level of the first light; and
detect a scatter level of the second light;
wherein the controller is configured to:
transmit the detected scatter level of the first light and the detected scatter level of the second light to a monitoring device;
receive a command from the monitoring device; and
command the second transmitter LED to cease emitting the second light responsive to the command from the monitoring device.