G - Physics – 08 – B
Patent
G - Physics
08
B
340/124.1
G08B 21/00 (2006.01)
Patent
CA 1187580
METHOD AND APPARATUS FOR MONITORING UNBURNED PARTICULATE ACCUMULATION IN THE EXHAUST DUCT OF A COMBUSTION SYSTEM Abstract The unburned particulate accumulation within the exhaust for a combustion system, such as the liner of a flue for a stove, is monitored by a circuit which receives a temperature indicating signal from a thermo couple mounted within the flue. The circuit includes comparators which process the temperature signal to determine whether the temperature is within in any of three ranges. When the temperature is within a normal burning range, the elapsed time that the tem- perature remains within such range is stored as a first count whose magnitude is proportional to the accumula- tion of particulates. When the first count exceeds a prescribed level, a warning device is activated. When the temperature reaches a higher cleaning range that is sufficient to burn the accumulated particulates, the elapsed time that the temperature remains within such range is stored in a second counter. The first counter is reset when the value of the second counter reaches a prescribed value.
424703
Demorest Donald R.
Johnson Thomas A.
Thielemans Michael J.
Demorest Donald R.
Johnson Thomas A.
Ridout & Maybee Llp
Thielemans Michael J.
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