Models 947, 948 and 960 Leak Detectors Operations and Service Manual
xxix
Vacuum Equipment and Cleanliness
Cleanliness is vital when servicing the leak detector or any vacuum equipment. There are
some techniques that are more important in leak detector servicing than in general vacuum
work:
CAUTION
Do not use silicone oil or silicone grease.
Use powder-free butyl or polycarbonate gloves to prevent skin
oils from getting on vacuum surfaces.
Do not clean any aluminum parts with Alconox
®
. Alconox is
not compatible with aluminum and will cause damage.
NOTE
Normally, it is unnecessary to use vacuum grease. However, if it
must be used, avoid silicone types, and use it sparingly.
Apiezon
®
L grease (Varian Vacuum Technologies Part No.
695400004) is recommended.
O-ring Care
When removing, checking, or replacing O-rings, keep in mind the following:
NOTE
Varian Vacuum Technologies recommends replacing all
O-rings during routine maintenance or during any maintenance
procedure requiring that O-rings be removed.
CAUTION
Remove O-rings carefully with your fingers. Do not use metal
tools for this task. Follow these guidelines to prevent scratching
of any sealing surfaces:
❑
Wipe all O-rings clean with a lint-free cloth before
installation to ensure that no foreign matter is present to
impair the seal.
❑
Do not use grease or use other substances on O-rings that
will come in contact with the spectrometer tube.
❑
Do not use alcohol, methanol, or other solvents on O-rings.
To do so causes deterioration and reduces the O-ring’s
ability to hold a vacuum.
❑
In allowable situations, apply a small amount of Apiezon
L
grease and wipe the O-rings “shiny” dry.
