Preventive Maintenance
(Re)Packing columns
158
(Re)Packing columns
In packing columns (particularly 1/4•inchglass columns), one must
consider the type of packing, column bore, and type (metal or glass), the
method of sample introduction (flash vaporization or on•column),inlet or
detector base requirements.
The method of sample introduction and/or the inlet/detector configuration
determines the distance from the column end at which packing should
start. Only general guidelines can be given here.
1. For FIDs and NPDs, at the detector end of the column, make sure
neither packing nor a glass wool plug retaining the packing comes in
contact with the bottom of the detector jet.
2. For 1/8•inchcolumns, where flash volatilization is used, packing
should be as close to the inlet end of the column as feasible, leaving
room for a glass wool plug to retain packing material.
Glass Wool
75
mm
(3 in)
45 mm
(1 3/4 in)
Inlet End Flash
Vaporization
Detector
End
Packing Limits for 1/4-inch Glass Columns
Figure 8-1
3. For 1/4•inchglass columns, since the inlet end serves as a liner, room
must be provided to ensure flash volatilization and to ensure the
syringe needle does not directly contact the glass wool plug and/or
packing material. See Figure 8•1for recommended packing limits.
