9 Maintaining the PTV Inlet
To Change the Septum on the PTV Inlet
154 Maintaining Your GC
To Change the Septum on the PTV Inlet
1 Gather the following:
• Replacement septum, see “Consumables and Parts for the Programmable
Temperature Vaporization Inlet” on page 144.
• 5/8-inch wrench
2 Launch the GC maintenance wizard: Maintenance > Inlets, select the 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 either is hot, wear
heat-resistant gloves to protect your hands.
3 Remove the septum retainer nut or Merlin cap. If the septum head begins to turn during
removal, support it manually while removing the cap.
4 Use tweezers to remove the septum or Merlin Microseal from the retainer nut. Do not
gouge or scratch the interior of the septum head.
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 Replace 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.
7 The GC maintenance wizard will perform checks at the appropriate times, including Leak &
Restriction tests, and will automatically reset the maintenance counters.
8 Select Finished, then select OK to exit the GC maintenance wizard.
9 Restore the analytical method.
Merlin Microseal and cap
Standard septum
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