
144 1100 Series Capillary LC System Manual
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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
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6
To d et ect or
rom autosamp
er
Column 1 Column 2
Heater assembly 1 Heater Heater assembly 2
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