US 12,282,008 B2
Methods of reducing the occurance of false positives in gas detectors
Ziyou Xiong, Wethersfield, CT (US); Michael Birnkrant, Whethersfield, CT (US); and Marcin Piech, East Hampton, CT (US)
Assigned to CARRIER CORPORATION, Palm Beach Gardens, FL (US)
Filed by Carrier Corporation, Palm, FL (US)
Filed on Jun. 2, 2022, as Appl. No. 17/805,174.
Claims priority of provisional application 63/203,246, filed on Jul. 14, 2021.
Prior Publication US 2023/0020905 A1, Jan. 19, 2023
Int. Cl. G01N 33/00 (2006.01)
CPC G01N 33/0067 (2013.01) [G01N 33/0063 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method of indicating the presence of a target gas in a gas volume comprising:
providing a gas sensing core, configured for detection of the target gas, and a condition sensor within the gas volume,
providing a controller disposed in electrical communication with the gas sensing core and the condition sensor,
allowing gas within the gas volume to fluidly interact with the gas sensing core,
monitoring with the controller a target gas measurement output from the gas sensing core,
monitoring with the controller a parameter output from the condition sensor,
recording a parameter output minimum value in a memory of the controller,
calculating with the controller a parameter difference, wherein the parameter difference is the difference between the minimum value of the parameter and an instant value of the parameter,
calculating with the controller a rate of change of the parameter with respect to time, and
indicating the presence of a target gas is detected in the gas volume when the target gas measurement exceeds a target gas measurement threshold value and the parameter difference is less than a parameter difference threshold value.