Agilent Technologies VS Series Operation Manual page 116

VS Series Helium Mass Spectrometer Leak Detectors
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:
When removing, checking or replacing O-rings:
4-2
Do not use silicone oil or silicone grease.
CAUTION
Use powder-free butyl or polycarbonate gloves to prevent skin
oils from getting on vacuum surfaces.
Do not clean any aluminum parts with Alconox
not compatible with aluminum and will cause damage.
Agilent does not recommend the use of vacuum grease.
NOTE
Vacuum grease absorbs helium tracer gas and releases this
slowly resulting in helium background during leak test
operations. If it must be used, use it sparingly and avoid
silicone types. Apiezon
No. 695400004).
Remove O-rings carefully with your fingers. Do not use metal
CAUTION
tools for this task. This prevents 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 any other substances on O-rings or metal
seals that will come in contact with the spectrometer.
Do not use alcohol, methanol or other solvents on O-rings as
this causes deterioration and reduces their ability to hold a
vacuum.
If applicable, apply a small amount of Apiezon L grease and
NOTE
wipe the O-rings shiny dry.
Due to the effective cleaning nature of VacuSolv solvent and
NOTE
its residue-free properties, Agilent' Component and
Spectrometer Cleaning Kit (Part Number 670029096), used in
accordance with the kit instructions, is recommended for
cleaning spectrometer 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 are 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). Other
acceptable solvents are isopropyl alcohol (IPA) or Dow
Corning
®
L grease is recommended (Agilent Part
®
OS-20.
. Alconox is
®