US 11,990,022 B2
Self-testing duct environment detector
Michael Barson, Nuneaton (GB); Scott Lang, Geneva, IL (US); Christopher Dearden, Melton Mowbray (GB); and Benjamin H. Wolf, Leicester (GB)
Assigned to Honeywell International Inc., Charlotte, NC (US)
Filed by Honeywell International Inc., Charlotte, NC (US)
Filed on Oct. 30, 2020, as Appl. No. 17/084,735.
Prior Publication US 2022/0139207 A1, May 5, 2022
Int. Cl. G08B 17/107 (2006.01); F24F 11/30 (2018.01); G08B 17/113 (2006.01); G08B 17/117 (2006.01); G08B 29/14 (2006.01)
CPC G08B 29/145 (2013.01) [G08B 17/107 (2013.01); G08B 17/113 (2013.01); G08B 17/117 (2013.01); F24F 11/30 (2018.01)] 20 Claims
OG exemplary drawing
 
1. A self-testing duct environment detector system, comprising:
a first portion to be mounted outside of a duct, the first portion having a detector housing with a space therein, the space having a detector with a sensing chamber and a self-testing sensing apparatus therein, wherein the self-testing sensing apparatus determines whether a rate of airflow through the sensing chamber is above a threshold rate; and
a second portion and third portion each configured to extend into the duct, wherein the second portion has at least one inlet aperture formed therein and wherein the third portion has at least one outlet aperture therein; and
wherein the self-testing sensing apparatus includes a particulate generator that generates self-test particulate into the sensing chamber and determines an obscuration rate of the self-test particulate over a period of time and compares the rate with at least one threshold rate to determine if airflow is adequate.