Varian 990 dCLD II, Operation Manual

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Model 990 dCLD II Component Leak Detector
5-2
Cleanliness is vital when servicing the leak detector or any vacuum equipment. There are
some techniques 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 is recommended (Varian Part No.
695400004).
When removing, checking or replacing O-rings:
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.
Do not use grease or other substance on O-rings that will come
in contact with the spectrometer tube.
Wipe all O-rings clean with a lint-free cloth before installation
to ensure that no foreign matter is present to impair the seal.
Apply a small amount of Apiezon
®
L grease and wipe the
O-rings “shiny” dry.
NOTE
Due to the effective cleaning nature of VacuSolv solvent and its
residue-free properties, Varian’ Component and Spectrometer
Tube Cleaning Kit (Part Number 670029096), used in
accordance with the kit instructions, is recommended for
cleaning the spectrometer tube components. The kit can also be
used for fine cleaning of other parts in the leak detector’s
vacuum system such as valves and fittings. No rinsing steps or
high-temperature drying is required following cleaning with
VacuSolv. Although appropriate precautions are advised,
VacuSolv is compatible with most materials and does not
contain toxic chemicals or CFCs (chlorofluorocarbons).