1220 Infinity II LC System User Manual 103
Injection System Description
6
Autosampler
Autosampler
Three sample-rack sizes are available for the autosampler. The standard
full-size rack holds 100 × 1.8 mL vials, while the two half-size racks provide
space for 40 × 1.8 mL and 15 × 6 mL vials respectively. Any two half-size rack
trays can be installed in the autosampler simultaneously. The analytical head
device provides injection volumes from 0.1 – 100 μL.
The autosamplers transport mechanism uses an X-Z-Theta movement to
optimize vial pick-up and return. Vials are picked up by the gripper arm, and
positioned below the sampling unit. The gripper transport mechanism and
sampling unit are driven by motors. Movement is monitored by optical sensors
and optical encoders to ensure correct operation. The metering device is
always flushed after injection to ensure minimum carry-over.
The six-port injection valve unit (only 5 ports are used) is driven by a
high-speed hybrid stepper motor. During the sampling sequence, the valve unit
bypasses the autosampler, and directly connects the flow from the pump to
the column. During injection and analysis, the valve unit directs the flow
through the autosamplers which ensures that the sample is injected
completely into the column, and that any sample residue is removed from the
metering unit and needle from before the next sampling sequence begins.
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