14 Agilent 1260 Infinity II Preparative Autosampler User Manual
1
Introduction
Operating Principle
11 The gripper arm moves out of the needle station and the wash port snaps
back in position.
12 The gripper arm replaces the vial, and returns to the home position.
Simultaneously, the needle lowers into the seat.
13 The injection valve switches to the mainpass position.
Injection Sequence
Before the start of the injection sequence, and during a preparative run, the
injection valve is in the mainpass position (see Figure 2 on page 14). In this
position, the mobile phase flows through the autosamplers metering device,
sample loop, and needle. This ensures that all parts in contact with sample are
flushed during the run, thus minimizing carry-over.
Figure 2 Mainpass Position - standard position during runs and when the sampler
is idle
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