Agilent Technologies 7000 Series Operating Manual page 172

7 General Maintenance
To Clean the EI HES
If insulators are dirty, clean them with a cotton swab dampened with
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reagent-grade methanol. If that does not clean the insulators, replace them. Do
not abrasively or ultrasonically clean the insulators.
Figure 54.
The filaments, source heater assembly, insulators, source mounting plate, and
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filament block cannot be cleaned ultrasonically. Replace these components if
major contamination occurs.
3 If the contamination is serious, such as an oil backflow into the analyzer,
Do not use the abrasive slurry on the source mount bushings.
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4 Abrasively clean the surfaces that contact the sample or ion beam.
172
Ion focus
Entrance
lens (2)
lens (1)
EI HES parts to be cleaned
seriously consider replacing the contaminated parts.
Use an abrasive slurry of alumina powder and reagent-grade methanol on a
cotton swab. Use enough force to remove all discolorations. Polishing the
parts is not necessary; small scratches will not harm performance. Also,
abrasively clean the discolorations where electrons from the filaments
enter the source body.
Source body
Repeller
Post extractor
Post extractor
lens 1 (4)
lens 2 (3)
7000/7010 Series TQ GC/MS Operating Manual
Extractor
lens (5)