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4. Gently remove the septum head assembly
from the inlet. Be careful not to excessively
bend the 1/16-inch lines. For best results, lift
the head to clear the inlet and then push it to
either side to allow access.
5. To reinstall the septum head, gently align the
head with the inlet and manually engage the
free-spinning nut to the inlet.
The nut should thread easily onto the inlet. If
resistance is felt, unscrew the nut and retry.
Excessive force can irreparably damage the
inlet.
6. Tighten the retaining nut 1/2 turn past finger
tight.
7. If the carrier gas and septum purge lines
were removed, reinstall them.
Released: April 2004
8. Check all connections for leaks. If necessary,
Replacing the septum
Either a regular septum or a Merlin microseal can
be used with the septum head.
If the inlet temperature is set below 40°C, the
Merlin microseal may not seal effectively. For
inlet temperatures below 40°C, use a regular
septum for the inlet seal.
1. To replace the septum, cool the inlet to ambi-
2. Unscrew (counterclockwise) the septum cap
6850 Series Gas Chromatograph Service Procedures
the retaining nut can be tightened an addi-
tional 1/4 turn to eliminate leaks.
ent temperature.
or Merlin cap.
112
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