| 摘要 |
<p>The unburned particulate accumulation within the exhaust for a combustion system, such as the liner (12) of a flue (14) for a stove (16), is monitored by a circuit which receives a temperature indicating signal from a thermocouple (20) mounted within the flue (14). The circuit includes comparators (52, 54, 56) which process the temperature signal to determine whether the temperature is within any of three ranges. When the temperature is within a normal burning range, the elapsed time that the temperature remains within such range is stored in a first counter (80) as a first count whose magnitude is proportional to the accumulation of particulates. When the first count exceeds a prescribed level, a warning device (32) 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 (82). The first counter (80) is reset when the value of the second counter (82) reaches a predetermined value. </p> |
