Agilent Technologies 7200 - Page 123

General Maintenance 6
To Clean the Ion Source
Operation Manual 123
Preparation
1 Disassemble the ion source. See “To Disassemble the EI Ion
Source” on page 114 or “To Disassemble the CI Ion
Source” on page 118.
2 Collect the following parts to be cleaned if you are cleaning a
high sensitivity extractor EI ion source: (Figure 33)
• Repeller
• Source body
• Extractor lens
• Ion focus lens
Collect the following parts to be cleaned if you are cleaning a
CI source:
• Repeller
• Source body
• Ion focus lens
These are the parts that contact the sample or ion beam. The
other parts normally should not require cleaning.
Cleaning the CI ion source is very similar to cleaning the EI ion
source, with the following exceptions:
• The CI ion source may not look dirty but deposits left by
chemical ionization are very difficult to remove. Clean the CI
ion source thoroughly.
• Use a round wooden toothpick to gently clean out the
electron entrance hole in the source body.
• Do not use halogenated solvents. Use hexane for the final
rinse.

CAUTION
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.
CAUTION
Do not use halogenated solvents to clean the CI ion source.