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Model 9110T NOx Analyzer Instrument Maintenance
Teledyne Analytical Instruments 242
11.3.1. REPLACING THE SAMPLE PARTICULATE FILTER
The particulate filter should be inspected often for signs of plugging or contamination. We recommend
that when you change the filter; handle it and the wetted surfaces of the filter housing as little as
possible. Do not touch any part of the housing, filter element, PTFE retaining ring, glass cover and the
o-ring with your bare hands. Teledyne API recommends using gloves or PTFE coated tweezers or
similar handling to avoid contamination of the sample filter assembly.
To change the filter:
1. Turn OFF the analyzer to prevent drawing debris into the instrument.
2. Open the 9110T’s hinged front panel and unscrew the retaining ring on the filter
assembly.
Figure 11-1 Replacing the Particulate Filter
3. Carefully remove the retaining ring, PTFE o-ring, glass filter cover and filter
element.
4. Replace the filter, being careful that the element is fully seated and centered in the
bottom of the holder.
5. Reinstall the PTFE o-ring with the notches up; the glass cover, then screw on the
retaining ring and hand tighten. Inspect the seal between the edge of filter and the
o-ring to assure a proper seal.
6. Restart the Analyzer.