7CI Maintenance
To Clean the CI Source
5977C GC/MSD Operating Manual 223
To Clean the CI Source
Materials needed
• Abrasive paper (5061-5896)
• Alumina abrasive powder (8660-0791)
• Aluminum foil, clean
• Cloths, clean (05980-60051)
• Cotton swabs (5080-5400)
• Glass beakers, 500 mL
• Gloves, clean, lint-free
• Large (8650-0030)
• Small (8650-0029)
• Solvents
• Acetone, reagent grade
• Methanol, reagent grade
• Methylene chloride, reagent grade
• Ultrasonic bath
Preparation
1 Disassemble the CI source. (See“To Disassemble the CI Source” on
page 220.)
2 Collect the following parts to be cleaned for a CI source: (See Figure 74 on
page 224.)
• Repeller
• Source body
• Drawout plate
• Drawout cylinder
• Ion focus lens
• Entrance lens
These are the parts that contact the sample or ion beam. The other parts
normally should not require cleaning.
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