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Instrument Maintenance T400 Ozone Analyzer Operator’s Manual
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11.3. MAINTENANCE PROCEDURES
The following procedures are to be performed periodically as part of the standard
maintenance of the Model T400.
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. TAPI
recommends using 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.
1. Open the T400’s hinged front panel and unscrew the knurled retaining ring on the
filter assembly.
Figure 11-1 Replacing the Particulate Filter
2. Carefully remove the retaining ring, PTFE o-ring, glass filter cover and filter
element.
3. Replace the filter, being careful that the element is fully seated and centered in the
bottom of the holder.
4. Re-install 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.
5. Re-start the Analyzer.
06870C DCN6332