Maintenance (Power Disconnected) TriStar II 3020 Scheduled Maintenance Instructions
6 Jun 09
2. Wait approximately 10 minutes (allowing the Dewar to warm), then rinse the Dewar with
warm (not hot) water to melt any remaining ice accumulation; dry thoroughly.
Replacing Analysis Port Filters and O-rings
A 40-µm frit is located in each analysis port of the analyzer. If the frit is contaminated, the
contaminant may adsorb or desorb during analysis, affecting the results. A contaminated frit
on the analysis port may be indicated by a leak or by a free-space reading much lower than
normal.
A contaminated frit should be replaced as follows:
1. Remove the sample tube fitting from the analysis port using a wrench. Pry out the frit and
O-ring.
2. Replace the frit and O-ring. Carefully reinstall the sample tube fitting and tighten by
hand. Then tighten with a wrench to prevent leaks.
For glass Dewars only: Do not rinse an iced Dewar with hot water; this could cause
the Dewar to implode.
40-µm Frit
O-ring
Sample Tube Fitting
To avoid outgassing problems, the frit and O-ring should be clean and should not be
touched with bare hands.
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