7 General Maintenance
To Clean the EI HES
5977B Series MSD Operating Manual 185
These are the parts that contact the sample or ion beam. The other parts
normally should not require cleaning.
3 If the contamination is serious, such as an oil backflow into the analyzer,
seriously consider replacing the contaminated parts
If insulators are dirty, clean them with a cotton swab dampened with
reagent-grade methanol. If that does not clean the insulators, replace them. Do
not abrasively or ultrasonically clean the insulators.
Figure 58 EI HES parts to be cleaned
Source body
Repeller
Entrance
lens (1)
Ion focus
lens (2)
Post extractor
lens 2 (3)
Post extractor
lens 1 (4)
Extractor
lens (5)
The filaments, source heater assembly, insulators, source mounting plate, and
filament block cannot be cleaned ultrasonically. Replace these components if
major contamination occurs.
Do not use the abrasive slurry on the source mount bushings.
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