CP-3800 GC Operator’s Manual
97
The sample is vaporized in the insert and then swept onto the column. The
use of glass wool in the insert allows the analysis of samples containing non-
volatile components. The non-volatile material is trapped on the glass wool
while the volatile components vaporize onto the column. The packed column
kit for the 1061 also contains a glass insert, in this case the packed column
buts up against the bottom of the insert.
Column Installation
The following instructions apply to installing a 0.53 mm ID capillary column in
the 1061 injector. Note that the thin polymeric coating on fused silica
columns will give some protection against breakage; however, fused silica
columns are somewhat fragile and must be handled with care.
Mounting
the Column
During operation, the fused silica capillary column hangs on the capillary
column holder in the column oven.
Note:
To prevent the fused silica column from unwinding, weave both of the
column ends through and around the column loop several times. This is
particularly useful if your column is not mounted in a cage.
Hang the coiled column on the capillary column holder then prepare column
end and complete column connections to both the injector and detector
fittings, as detailed in the following paragraphs.
Preparing
Column
Ends
To ensure a leak-free connection of capillary columns, the ends of the
column must be cut squarely and as smoothly as possible. To achieve this, a
proper scoring tool is required. A ceramic scoring wafer (01-900158-00) is
recommended. Before cutting the sealed ends of the column, slide the
capillary column nut over the column end. Install the appropriate Vespel,
graphite/ Vespel, or graphite ferrule onto the column with the tapered end
toward the capillary column nut. This procedure prevents contaminating the
column with ferrule material.
1
Grasp the column securely between the thumb and forefinger of
one hand. Score the column once lightly with the cutting tool.
2
Per Figure 12, bend column slightly to break it at the score mark. A
magnifying lens (recommended 20X magnifier, 00-997369-00) is
necessary to determine the quality of the cut. (If small splinters of
silica or some of the outer coating remains on the column end, it is
advisable to make a fresh cut.)
3
Install a capillary injector nut and reversed ferrule on the column.
4
Push the column into the injector until it stops.
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