8 Maintaining the MMI
To Change the Septum on the MMI
130 Maintaining Your GC
To Change the Septum on 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
2 Launch the GC maintenance wizard: Maintenance > Inlets, select the multimode inlet, then
select Perform Maintenance > Replace Septum > Start Maintenance. The wizard will walk
through the steps needed to replace the septum (those same steps are repeated below).
Be careful! The oven and/or inlet may be hot enough to cause burns. If the inlet is hot, wear
heat-resistant gloves to protect your hands.
3 Remove the septum retainer nut or Merlin cap.
4 Use tweezers to remove the septum or Merlin Microseal from the insert assembly. Do not
gouge or scratch the interior of the insert assembly.
5 Firmly press the new septum or Merlin Microseal into the fitting. The metal parts side of
the Merlin Microseal should face down (toward the oven).
6 Install the septum retainer nut or Merlin cap and finger-tighten. Tighten the septum retainer
nut until the C-ring is about 1 mm above the nut.
Overtightening the septum nut can cause contamination.
Septum retainer nut
Septum
Insert assembly
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