AccuPyc II 1340 Maintenance
Aug 2013 5-9
Cleaning the Dust Filter (2000-cm
3
units only)
Dust from the sample may be carried into the instrument plumbing. A dust filter protects the
valves to minimize valve leaks. When it is necessary to clean the filter, follow these steps:
1. Close the gas line (Fill) valve. Open the expansion and vent valves to ensure that the
system is not under pressure.
2. At the lower rear of the instrument, remove the two screws which hold the dust filter
cover and remove the cover plate.
3. Remove the spring and the filter. Remove the small O-ring inside the filter port.
4. Clean all parts with alcohol. The filter may require sonication to dislodge dust. It should
be replaced if it becomes severely clogged.
5. Inspect the O-rings before re-assembly. A very thin coating of vacuum grease may be
used.
6. Reassemble.
7. Check for leaks:
a.) Fill the system with gas.
b.) Open expansion valve.
c.) Check for leaks by applying a leak detecting liquid around the dust filter cover.
Filter port
CoverplateO-ring (size 006)
Retaining screws
Filter
Spring
O-ring
(size 011)
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