CP-3800 GC Operator’s Manual
91
Table 15 General Tightening and Retightening for Common Ferrules
Ferrule Type
Recommendation
Comments
New
graphite ferrule
¼ - turn past finger-tight
¼ - to ½ - turn past finger-tight
may be required to achieve a
seal.
Used
graphite ferrule
¼ - turn past finger-tight
If a different size of column is
used, more tightening may be
required.
New
polyimide/graphite
ferrule
¼ - to ½ -turn past finger-tight
May require retightening after
first or second programmed run.
Over tightening will destroy
ferrule and seal.
Used
polyimide/graphite
ferrule
¼ - turn past finger-tight
Re-use only on same size
column.
New
polyimide ferrule
Not recommended with 1041
Used
polyimide ferrule
Not recommended with 1041
CAUTION
Column
Connection
to Injector
IMPORTANT ALIGNMENT OF THE CAPILLARY COLUMN:
When a 0.53
mm ID capillary column is used in combination with the Varian 1041 injector,
alignment of the column is critical. Use the following steps to precisely align
the capillary column. Unless this procedure is followed, the injection syringe
may damage the top of the column or peak tailing may result.
The pure graphite ferrule must not be used on the detector (effluent) end of
the column when connected to an Electron Capture Detector (ECD).
Graphite tends to absorb, then desorb compounds that may contaminate the
ECD. Graphite/Polyimide ferrules are recommended for ECD use.
1
Install the capillary injector insert nut and the reversed ferrule on
the column.
2
Uncoil about 20 cm of the injector end of the column.
3
Gently push the column fully up into the injector (approximately 3.5
inches), until the column comes to a firm stop. This correctly
positions the column against the upper end of the injector insert.
The column must go in the full distance. If it does not, the injector
will not function properly. Tighten the column nut just enough to
prevent column movement.
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