9 Maintaining the PTV Inlet
To Clean the Septum Seat in the Septum Head Assembly of the PTV Inlet
Maintaining Your GC 155
To Clean the Septum Seat in the Septum Head
Assembly of 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
• Tweezers
• Compressed, filtered, dry air or nitrogen
• Lint-free gloves
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.
Wear clean, lint-free gloves to prevent contamination of parts with dirt and skin oils.
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 Unscrew the septum head assembly from the inlet and move it up and away from the inlet.
5 Use tweezers to remove the septum or Merlin Microseal from the retainer nut. Do not
gouge or scratch the interior of the septum head.
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.
7 Use compressed air or nitrogen to blow away the pieces of steel wool and septum.
8 Replace the septum head assembly on the inlet. Finger-tighten the septum head and then
tighten an additional 1/2 turn with a wrench.
9 Firmly press the new septum or Merlin Microseal into the fitting. See “To Change the
Septum on the PTV Inlet” on page 154.
10 Replace the septum retainer nut or Merlin cap and finger-tighten. See “To Change the
Septum on the PTV Inlet” on page 154.
11 Perform an inlet Leak & Restriction test and reset the maintenance counters.
12 Exit maintenance mode. Select Maintenance > Instrument > Perform Maintenance >
Maintenance Mode > Finished.
13 Restore the analytical method.
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