Routine Maintenance: Inlets
Maintaining a purged packed inlet
Released: March 2004 6850 Series II GC User Information page 148 of 256
Cleaning the inlet
It is unlikely that the inlet will frequently require thorough cleaning as
described below; however, deposits from injected samples occasionally build
up inside the purged packed inlet. Before cleaning the inlet, replace the column
liner and insert with clean ones. See “Installing a liner” on page 137 and
“Installing a glass insert” on page 138. If the problem remains, then clean the
inlet.
Materials needed:
• Cleaning brushes—The FID cleaning kit contains appropriate brushes
(part no. 9301-0985)
• Solvent that will clean the type of deposits in your inlet
• Compressed, filtered, dry air or nitrogen
1. If you have entered parameters that you do not want to lose, store them as
a method.
2. Turn off the GC and unplug it.
3. Turn the inlet pressure off at the source.
4. Let the heated zones (inlet, detector, oven, and valve box) cool to room
temperature.
5. If the septum is worn out or dirty, replace it. See “Changing septa” on
page 139 for instructions.
6. Remove the column and the column liner and insert. See “Columns and
Traps” on page 21, “Installing a liner” on page 137, and “Installing a glass
insert” on page 138 for details.
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