Varian 948, Operation And Service Manual

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Models 947, 948 and 960 Leak Detectors Operations and Service Manual
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2. Remove the test port compression ring and O-ring from the top of the test port
(Figure 4-14).
Figure 4-14 Remove the Test Port Compression Ring and O-ring
4.2.9.2 Examining and Cleaning the Test Port
To perform this procedure:
1. Remove the O-ring from the compression ring.
2. Examine the O-ring for wear. If necessary, use a new O-ring, otherwise clean the O-ring.
NOTE
Varian Vacuum Technologies recommends replacing all
O-rings during routine maintenance or during any maintenance
procedure requiring that O-rings be removed.
3. Before re-using O-rings or installing new O-rings, wipe them down with a lint-free cloth
before installation to ensure that no foreign matter is present to impair the seal.
4. If applicable, apply a small amount of Apiezon L grease and wipe the O-rings “shiny”
dry.
CAUTION
Remove O-rings carefully with your fingers. Do not use metal
tools for this task. This prevents scratching of any sealing
surfaces.
Do not use alcohol, methanol or other solvents on O-rings. To
do so causes deterioration and reduces their ability to hold a
vacuum.
5. Examine all parts of the test port, including inside the test port.
If necessary, use a VacuSolv wipe to remove any dirt or foreign matter and allow parts to
air dry.