10-48 Routine Maintenance
4. Sonicate the slit in a suitable solvent to remove any remaining grease.
See also: Ultrasonically cleaning the inner source components on
page 10-21.
To assemble the outer source:
Assemble the outer source in the reverse order to which you
disassembled it, consulting the diagrams prepared during disassembly.
Checking for leaks after source maintenance
Leaks normally occur when components have recently been removed for
cleaning and/or refitted. The following are indications that air is leaking into
the instrument:
• Poor source vacuum.
• Large air peaks in the spectrum (nitrogen peak at 28 Da and oxygen
peak at 32 Da).
• Problems tuning the instrument.
There are a number of places where an air leak may occur. These tend to
include components that are replaceable or serviceable.
•O-rings:
• Outer source lid
• Inner source lid
•GC interface
•Septum
• GC interface ferrule
•GC column
• Reference reservoir double-ended ferrule
• CI connection on top of the outer source
Inspecting the CI gas line for leaks
You must ensure the CI gas line is gas-tight because flammable or corrosive
gases are used. Use the procedure to initially determine whether the CI line
leaks.
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