Agilent Technologies 1260 Infinity Quaternary LC VL, System Manual And Quick Reference

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20 Agilent 1260 Infinity Quaternary LC VL Manual and Quick Reference
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Introduction
Autosampler
vials and 15 × 6 mL vials respectively. Any two half-size rack trays can be
installed in the autosamplers simultaneously. A specially designed
sample-rack holding 100 × 1.8 mL vials is available for use with thermostatted
autosamplers. The half-size racks trays are not designed for an optimal heat
transfer when they are used with a thermostatted autosampler.
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 module uses an analytical head providing injection volumes from
0.1 to 100 µL for pressures up to 600 bar.
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 autosampler 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. Different valves are
available.
Control of the vial temperature in the thermostatted autosampler is achieved
using the additional Agilent 1260 Infinity ALS thermostat. Details of this
module are given in the Agilent 1260 Infinity Autosampler Thermostat
manual.