When {HEAD ~ the temperature} reaches {TAIL ~ 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 
When { HEAD ~ the temperature } reaches { TAIL ~ 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
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH