4 Maintaining Capillary Columns
Preparing the column installation to the inlet
44 Maintaining Your GC
Figure 15. Align column (split/splitless shown)
6 Begin to swage the ferrule to the column using a 1/4-inch open-ended wrench.
The design of UltiMetal Plus Flexible Metal ferrules reduces the probability of column
breakage and minimizes the damage to the thread of the corresponding fittings.
Unlike other ferrule designs, a reliable leak-free seal is best made by tightening the
column nut to a recommended number of degrees, not by applying more force. Applying
excessive force will not provide a better seal. Also, compressing the flexible ferrule less
minimizes damage to fittings.
To swage the ferrule to the column:
a Find your ferrule type in Table 7 and note the range of degrees to tighten the column
nut.
b Tighten the column nut clockwise to the lower end of your ferrule’s range.
c Check if the ferrule is gripping the column. If yes, stop. If not, continue to tighten the
column nut in small 5- to 15-degree increments. Check after each increment to see if
the ferrule is gripping the column. Stop as soon as gripping occurs. See Figure 16.
Table 7 Degrees to tighten the column nut for proper swaging
Ferrule part number Degrees to tighten internal nut
G3188-27501 50 – 100 degrees
G3188-27502 30 – 70 degrees
G3188-27503 20 – 50 degrees
G3188-27504 60 degrees
G3188-27505 40 – 90 degrees
G3188-27506 20 – 50 degrees
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