Injection Sequence - Agilent Technologies 1220 Infinity II LC User Manual

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Injection System Description
Autosampler

Injection Sequence

Before the start of the injection sequence, and during an analysis, the injection
valve is in the mainpass position. In this position, the mobile phase flows
through the autosamplers metering device, sample loop, and needle, ensuring
all parts in contact with sample are flushed during the run, thus minimizing
carry-over.
Figure 31 Mainpass Position
When the sample sequence begins, the valve unit switches to the bypass
position. Solvent from the pump enters the valve unit at port 1, and flows
directly to the column through port 6.
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