Columns and Traps
Capillary column hanger
Released: March 2004 6850 Series II GC User Information page 22 of 256
Capillary column hanger
Agilent capillary columns are wound on wire frames that slip over a hanger
connected to the bottom of the oven lid (Figure 5).
Figure 5. Capillary column hanger
Removing the capillary column hanger
If you are using a packed column, you will need to remove the column hanger.
1. Remove the two screws that secure the hanger to the top of the oven, then
remove the hanger.
2. Reinstall the screws in the oven lid so you don’t lose them. Save the
hanger.
Ferrules for capillary columns
Table 8 lists some of the ferrules used with capillary columns. See the Agilent
catalog for consumables and supplies for a more complete listing.
Graphite and graphitized-Vespel® ferrules
Select a ferrule that is sized for your column. Finger-tighten the connection and
then use a wrench to make a 1/4 turn to produce a good seal. Loose ferrules
may require so much force that the inlet fitting, the nut, or the ferrule may be
damaged. With hard ferrules, it is best to start with an undersized hole and drill
it to fit the column.
Vespel ferrules
These ferrules can be more leak-tight than graphite but they have a lower
temperature limit. Retighten after a few oven temperature cycles.
Flanged hanger
Plain hanger
(required if
cryogenic oven
cooling used)
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