2 replacing the sample particulate filter – Teledyne 9110AH - Nitrogen oxides analyzer User Manual

Page 104

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TELEDYNE Model 9110AH NO

X

Analyzer Operator Manual, 01620, Rev. F

8-2

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 the reading to be low. A discoloration of

the filter membrane indicates that the filter is dirty and should be changed.

To change the filter:

1. Locate the sample filter on the outside rear panel.

2. Unscrew the hold-down ring, remove the Teflon o-ring and then the filter disc. See

Figure 8-1 for an exploded view of the filter assembly.

3. 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.

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