Agilent Technologies 1100 Series Manuel d'instructions Page 154

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144 1100 Series Capillary LC System Manual
6Options
The micro column switching valve allows also to work with a column
back-flushing. The sample is injected into series-connected precolumn and
analytical column. After the valve has switched, the analytical column flow
continues in normal direction. Only the precolumn is back-flushed, eluting
highly retained peaks directly to the detector.
Figure 42 Precolumn back-flushing
1
2
3
4
6
To d et ect or
F
rom autosamp
l
er
Column 1 Column 2
Heater assembly 1 Heater Heater assembly 2
5
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