8 Maintaining the MMI
To Clean the Septum Seat in the Insert Assembly of the MMI
132 Maintaining Your GC
To Clean the Septum Seat in the Insert Assembly of
the MMI
1 Gather the following:
• Replacement septum, see “Consumables and Parts for the Multimode Inlet” on
page 122.
• Wrench, hex for changing septum
• 0- or 00-grade steel wool (optional)
• Tweezers
• Compressed, filtered, dry air or nitrogen
2 Manually set the inlet and oven temperature to < 40 °C, and wait for the inlet, oven, and
other parts you might come into contact with inside the oven, to cool before continuing.
Alternately, place the GC in maintenance mode: Maintenance > Instrument > Perform
Maintenance > Maintenance Mode > Start Maintenance.
Be careful! The oven and/or inlet may be hot enough to cause burns. If either is hot, wear
heat-resistant gloves to protect your hands.
3 Slide the locking tab forward (counterclockwise). Lift the insert assembly straight up and
away from the inlet to avoid chipping or breaking the liner.
4 Remove the septum retainer nut or Merlin cap.
5 Use tweezers to remove the septum or Merlin Microseal from the retainer nut. See “To
Change the Septum on the MMI” on page 130.
6 Scrub the residue from the retainer nut and septum holder with a small piece of rolled-up
steel wool and tweezers. Do not do this over the inlet.
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