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Tips for
Tightening
Column
Ferrules
Refer to the table below for instructions to tighten the capillary column nut
with a variety of ferrule types. Do not over tighten capillary column nuts -
use a new ferrule if the column does not seal. Over tightening capillary nuts
can destroy some ferrules, particularly graphite.
Table 8 Column Ferrule Selection
Type of ferrule...
Recommendation Comments
New
graphite ferrule
1/4-turn past finger-tight
1/4-to 1/2-turn past finger-tight may
be required to achieve a seal.
Used
graphite ferrule
1/4-turn past finger-tight
If a different size of column is used,
more tightening may be required.
New
graphite-Vespel®
ferrule
1/4- to 1/2-turn past finger-tight
May require retightening after first or
second programmed run.
Used
graphite-Vespel®
ferrule
1/4-turn past finger-tight
Reuse only on same size column.
New
Vespel® ferrule
1/4- to 1/2-turn past finger-tight
May require retightening after first or
second programmed run.
Used
Vespel® ferrule
1/4-turn past finger-tight
Reuse only on same size column.
Setting 1079 Gas Flow Rates
The gas flow rates for the 1079 Universal Capillary Injector can be set using
manual pneumatics or Electronic Flow Control. Note that a positive flow
through the column must be set before heating the column.
CAUTION
Do not heat the column oven above 50
°
C without carrier gas
flowing through the column. The column phase can be irreversibly
damaged. Allow 10 – 15 minutes to purge the column before
heating.
EFC Pneumatics
Type 1 EFC used with the 1079 injector allows the user to set a constant
column head pressure, build a pressure program, or set a constant column
flow. In addition, a split ratio can be set or time programmed. A pressure
program is typically used to maintain the column flow at a constant value
while temperature programming the column oven. When Constant Flow
Programming is enabled, the pressure program needed to maintain constant
flow is derived whenever the method is activated.
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