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Service Maintenance
________________________________________ Cleaning the Ion Optics and Mass Analyzer
__________________ LCQ Deca XP Plus Hardware Manual _________________
5-15
Cleaning the Ion Detection System
The conversion dynode and electron multiplier of the ion detection system
must be kept dust free. Clean the conversion dynode and electron multiplier
whenever you remove the top cover plate of the vacuum manifold. Cleaning
the conversion dynode and electron multiplier involves only blowing them
with clean, dry gas such as nitrogen. Freon gas is not recommended. Do not
use liquids to clean the ion detection system components. Always cover
the opening in the top of the vacuum manifold with a large, lint-free tissue
whenever you remove the top cover plate of the vacuum manifold.
Reinstalling the Top Cover Plate of the
Vacuum Manifold
Use the following procedure to reinstall the top cover plate of the vacuum
manifold:
1. Remove the tissue from the opening in the top of the vacuum manifold.
2. Check the O-ring that surrounds the opening for signs of wear, and
replace it if necessary (P/N 97000-40015). Make sure that the O-ring is
seated properly.
3. Carefully lift the top cover plate up by its two handles and turn it over.
Orient the top cover plate such that the electron multiplier is over the
conversion dynode. Carefully insert the guide posts on the underside of
the top cover plate into the guide holes in the vacuum manifold. Slowly
lower the cover plate onto the opening in the vacuum manifold. Take care
not to damage the components on the underside of the cover plate.
Ensure that the cover plate is seated properly on the vacuum manifold.
4. Use a 7/16-in. open-end wrench to reconnect the helium damping gas line
to the fitting. See Figure 5-1.
5. Reconnect (at ANAL. AUX 1 IN) the octapoles cable that comes from the
Analyzer Auxiliary PCB.
6. Reconnect (at ANALYZER) the lenses cable that comes from the System
Control PCB.
Note. Periodically, remove any contamination that might be on the inner
walls of the manifold by wiping the inner walls with a lint-free tissue soaked
in HPLC-grade methanol. Use a cotton-tipped applicator soaked in
methanol to clean around inlets and feedthroughs.
Содержание LCQ Deca XP Plus
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