Replacing Port Filter (Frit) And O-Ring - Micromeritics TriStar II 3020 Operator's Manual

TriStar II 3020
5. Rinse the Dewar with warm water to melt any ice accumulation which may remain in the Dewar,
then dry thoroughly.

Replacing Port Filter (Frit) and O-ring

A filter (frit) is located in each analysis port. If the filter is contaminated, the contaminant may adsorb
or desorb during analysis, affecting the results. A contaminated filter on the analysis port may be indi-
cated as a leak or a free space reading much lower than normal.
A contaminated filter should be replaced as follows:
1. Select Unit [n] > Show Instrument Schematic, then Unit [n] > Enable Manual Control.
2. Right-click on the valve of the appropriate port and select Close to close the valve.
3. Use a wrench to remove the sample tube fitting from the port. Pry out the filter and O-ring.
To avoid degassing problems, the filter and O-ring should be clean and should not be
touched with bare hands.
4. Replace the filter and O-ring. Carefully reassemble the sample tube fitting and reinstall on the
sample port. Tighten by hand, then with a wrench to prevent leaks.
302-42828-01 - Dec 2012
Preventive Maintenance
O-ring
Filter (frit)
Sample tube fitting
9-5