CM4 Four-Point Continuous Monitor
CM4 Technical Manual
9-10
4. Grasp the filter block handle (2) and pull out.
5. The filters are attached with a quick disconnect connector.
Remove the filter by pressing the gray ring (3) against the
fitting and sliding the filter out of the fitting.
6. Install the new filters by fully inserting the fittings. Filters have
an arrow on the filter body indicating the direction of flow. The
arrows should point toward the filter block. Be sure to orient
the filters correctly
7. Reinstall the filter block (1).
8. Reinstall the Chemcassette
®
carrier and close the tape load
lever.
9.3.2 Sample Line Particulate Filter
Sample line particulate filters prevent dust from entering through
the sample line. Particulate filters are not recommended for
all applications. See
for compatibility information.
Replace the sample filter every three to twelve months.
Remove the old filter from the end of the sample line and attach a
new filter. Install the filter so the arrow on the side of the filter points
toward the CM4 tubing.
9.3.3 CM4-P Filter Maintenance
CAUTION
The pyrolyzer operates at a very high temperature. Before performing
any service on the instrument, always wait 30 minutes after switching
off power to allow the pyrolyzer to cool.
The filter block in the Model CM4-P is physically larger than the
block in the standard Model CM4 (See Figure 9-8). Removing the
filter block is the same as described in
, Internal Filter
Replacement.
Figure 9-8: CM4-P Filter Block
There are nine filters in the CM4-P filter block: four charcoal for Freon
®
removal, four particulate, and one acid scrubber. The acid scrubber and
particulate filters are identical to the standard Model CM4. The charcoal
filters have a part number unique to the CM4-P: P/N 1874-0139. These
filters are not interchangeable with other charcoal filters for removing
Freon, such as those used on System 16.
Note the flow direction arrow when replacing the charcoal and
particulate filters:
• Freon filters: arrow points away from the removable filter
block
• Particulate filters: arrow points toward the removable filter
block
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