34
Application Examples
AZURA V 2.1S User Manual, V6860, Version 2.2
Reed contact
The reed contact informs the analytical system whether the valve is positioned
to ‘
LOAD
’ or ‘
INJECT
’.
Selecting the Column
The column selection is used in chromatography, for example, in the following
cases:
Method development
Usage of different columns in the same HPLC system
Separation of the sample on the precolumn
Separation of the sample components on different columns
Note:
Make sure there is no pressure when switching between the columns so
that the columns are not damaged.
Functional Principle
From the valve, the sample is transported through the channel
2->1
onto the
column
A
1
.
From port 5, the components of the sample are forwarded sepa-
rately to the detector
2
.
Fig. 22 column selection using column A
After switching the 2-position valve, the sample is transported through the
channel
2->3
to the column B
3
.
From port 5, the components of the sample
are forwarded separately to the detector
2
.
Fig. 23 column selection using column B
1
2
3
4
5
6
1
2
3
1
2
3
4
5
6
2
1
3
