Patent ID: 8684276

Claim:
A portable heating device comprising: a combustion-powered heater, supplied by an associated fuel source, and comprising a combustion region comprising a catalytic surface; a regulator adapted for fluid communication with the associated fuel source; and an oxygen depletion sensor (ODS), configured to selectively render the combustion-powered heater non-functional when a non-desired atmosphere is detected, said ODS comprising a burner in fluid communication with said regulator, said burner adapted to combust fuel from said regulator with air to produce an ODS flame, and a temperature detector, adapted to detect the temperature of said ODS flame wherein said temperature of said ODS flame is indicative of a desired atmosphere and said non-desired atmosphere; wherein said ODS flame is adapted to have a temperature indicative of the non-desired atmosphere when the atmosphere comprises one or more of: a carbon dioxide amount of more than 5000 PPM; a carbon monoxide amount of more than 100 PPM; or at least 82% by volume non-oxygen components.