1220 Infinity II LC System User Manual 107
Injection System Description
6
Autosampler
When the metering unit has drawn the required volume of sample into the
sample loop, the needle is raised, and the vial is replaced in the sample tray.
The needle is lowered into the needle seat, and the injection valve switches
back to the mainpass position, flushing the sample onto the column.
Figure 34 Mainpass Position (Sample Injection)
Sampling Unit
The sampling unit comprises three main assemblies: needle drive, metering
device, and injection valve.
Needle-Drive
The needle movement is driven by a stepper motor connected to the spindle
assembly by a toothed belt. The circular motion of the motor is converted to
linear motion by the drive nut on the spindle assembly. The upper and lower
needle positions are detected by reflection sensors on the sampling unit flex
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