148 Maintaining Your GC
8 Maintaining the MMI
7
Moisten a cotton swab with solvent and wipe the inside
bottom seal of the inlet repeatedly to remove any loose
material from the MMI. If desired, the cotton swab can be
used to clean the bore of the inlet. For most samples, this
is not necessary. Dispose of the swab after a single use.
8 Using a dry abrasive swab, place the swab all the way to
the bottom of the inlet and with moderate pressure, twist
the swab forwards and backwards while it is in contact
with the bottom of the MMI (approximately 20 cycles
should be sufficient). The abrasive swab can be used
multiple times.
9 Using a second solvent moistened cotton swab, wipe the
bottom of the inlet to remove any residue. Depending on
the amount of use and maximum temperature used, the
bottom of the inlet may still show some oxidation (light
brown color). This is normal and will not affect inlet
performance. Repeat steps 3- 5 (if necessary) to remove
any remaining deposits.
10 Using clean solvent, rinse the inlet volume several times
but never overfill the inlet bore. Position a container
under the column opening in the inlet to catch the used
solvent exiting the bottom of the MMI.
11 Allow the inlet to dry.
12 Install the liner and O- ring.
13 Reinstall the column.
14 Turn on the GC.
15 Check for leaks.
16 Restore the analytical method.
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