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Teledyne API Model 100AH SO
2
Analyzer Instruction Manual, 02417, Rev. D
9.2 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 SO
2
, thus causing those readings to be lower than the actual
value. A very dirty filter can cause serious monitoring problem such as very slow and low
response, inability to span, and contamination of the analyzer. The particulate filter should be
changed at a minimum every 2 weeks. If the instrument is operated under high dust environment,
the particulate filter should be replaced more frequently.
To check and change the filter (refer to Figure 9-1):
1. Locate the filter on the rear panel of the analyzer, unscrew the hold-down ring and visually
inspect the filter.
2. If the filter appears dirty, remove the o-ring and then the filter.
3. Replace the filter, being careful that the element is fully seated in the bottom of the holder.
Replace the o-ring, then screw on the hold-down ring and hand tighten.
9-2