Page 6
Info display
Filters
Particulate filter (water trap filter)
Unscrew the cover of the water trap and check the particu-
late filter for grayness. Change the filter when it is dark gray.
Tip: use the elbow piece as a reference since it is dark gray.
In-line smoke filter
The round in-line smoke filter should be checked periodically
for grayness. Change the filter when it is dark gray. Tip: use
the elbow piece as a reference since it is dark gray.
NOx/SOx filter
The CO sensor has an independent gas path (see 4. Gas
Path Diagram) which includes a potassium permanganate
chemical filter for filtering SO2 and NOx from the gas sample.
Color change: purple -> brown -> grey-> white
Filter media should be changed once it has turned grey!
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