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Teledyne API Model 200AU NO
X
Analyzer Instruction Manual, 02293, Rev. F
8-3
8.2 Replacing the Sample Particulate Filter
The particulate filter should be inspected often for signs of plugging or contamination. It is also
common for dirt particles to absorb NO
2
, thus causing those readings to be low.
To check and change the filter:
1. Fold down the M200AU front panel.
2. Locate the filter on the left side of the analyzer front panel. See Figure 8-1 for an
exploded view of the filter assembly.
3. Visually inspect the filter through the glass window.
4. If the filter appears dirty, unscrew the hold-down ring, remove the teflon o-ring and then
the filter.
5. Replace the filter, being careful that the element is fully seated in the bottom of the
holder. Replace the teflon o-ring, then screw on the hold-down ring and hand tighten.