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M400E Ozone Analyzer Operator’s Manual Maintenance Schedule & Procedures
12.3. MAINTENANCE PROCEDURES
The following procedures are to be performed periodically as part of the standard maintenance of the Model
400E.
12.3.1. 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. T-API 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.
2. Open the M400E’s hinged front panel and unscrew the knurled retaining ring on the filter assembly.
Figure 12-1 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. 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.
6. Re-start the Analyzer.
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