Spectrometer Tube Exchange; Removing And Replacing Both The Spectrometer Tube Assembly And Preamplifier; Reinstalling The Spectrometer Tube - Agilent Technologies 947 Betriebs- Und Servicehandbuch

Models 947, 948 and 960 Leak Detectors Operations and Service Manual

4.2.7 Spectrometer Tube Exchange

The spectrometer tube replaceable parts consist chiefly of the ion source, the preamplifier,
the magnetic poles, and the spectrometer tube as a complete assembly.
Replacement of the ion source or preamplifier requires removal of the spectrometer tube.
Complete overhaul of the spectrometer tube includes complete disassembly of the
spectrometer tube including replacing the ion source and preamplifier. Both procedures
require that calibration, tuning and leak checking be performed prior to using the
947/948/960 for testing.

4.2.7.1 Removing and Replacing both the Spectrometer Tube Assembly and Preamplifier

Refer to "Disassembly of the Spectrometer Tube and Preamplifier" on page 4-15.

4.2.7.2 Reinstalling the Spectrometer Tube

To perform this procedure:
1. Using a VacuSolv wipe, clean the SVBA flange and allow it to air dry completely.
2. Place the clean, new, ungreased centering ring and O-ring on the vacuum flange of the
spectrometer tube.
NOTE
CAUTION
WARNING
Because of the complexity and sensitivity of the
preamplifier, Varian recommends replacing the entire
spectrometer tube if the preamplifier must be replaced.
Rebuilt spectrometer tubes are available from Varian
Vacuum Technologies on an exchange basis. Contact
Varian Vacuum Technologies Customer Service at
1-800-8VARIAN for details.
Use powder-free butyl or polycarbonate gloves to
prevent skin oils from getting on vacuum surfaces.
The preamplifier is a static sensitive device. Wear a
grounding device while the preamplifier is being
handled.
Store the Ion Source in a cool, dry area in a tightly
sealed container. When handling the Ion Source, wear
powder-free butyl or polycarbonate gloves. If you
handle the Ion Source with bare hands, wash them
thoroughly and especially before smoking or eating.
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