Guard
Columns |
Protection of HPLC Columns against Mechanical
Pollution
For
a trouble-free function of HPLC columns it is essential, to remove
solid pollutions from the eluent (buffer solutions), from samples and
equipment (abrasion). This can be achieved by filtration of the eluent and
the sample, as well as by Guard
Columns and Precolumns
.
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G
|
Guard Columns
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H
|
Separation Column
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I
|
Injection Valve
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M
|
Mixing Chamber
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P
|
Pumps
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V
|
Precolumn
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D
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Detector
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Guard Columns
It is really impressive, how much
"mud"
accumulates within these filter columns despite careful purification and
filtration of the eluent. This mud would land in the injection valve and
above all in the separation column. This is the reason for the often observed
continuous rising of the column pressure and a decrease of the plate number of the main column.
Our Guard Columns are 33 x 4.6
mm steel columns filled with an universal packing and 1/16" fittings
for capillary tubes. These columns take the function of eluent filters befor
the injection valve or the mixing chamber. In contradiction to simple
filters they do not block, because the mud particles separate
three-dimensional and not in a plane. Therefore the pollution of the guard
columns leads only during a longer use to a (small) pressure rise, so that
they have to be replaced very seldom. Use guard column also in cases,
where precolumn cartridges are employed for the determination of samples.
Article
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Unit
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Order-Code
|
Price (€)
|
Guard
Column
|
Piece
|
GUARD
|
75.00
|
Guard Column
|
Pair
|
GUARD2
|
140.00
|
Guard Column, REFILL
|
Piece
|
GUARDR
|
40.00
|
Guard Column, REFILL
|
Pair
|
GUARD2R
|
72.00
|
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