Agilent Technologies G1367A Reference Manual page 199

6
Introduction to the Well-plate Sampler
The standard metering device (for the G1367A/68A) provides injection
volumes from 0.1–100 µl. A multi-draw kit extends the range up to 1500 µl.
The micro metering device (for the G1377A/78A) provides injection volumes
from 0.01 - 8 µl with the standard loop capillary installed and from 0.01 - 40 µl
with the extended loop capillary. The metering device is always flushed by the
mobile phase after injection for minimum internal carry-over.
An additional needle flush station with a peristaltic pump is installed to wash
the outside of the needle. This reduces the already low carry-over for very
sensitive analysis. The bottle containing the mobile phase for the wash
procedure will be located in the solvent bottle cabinet. Produced waste during
this operation is channeled safely away through a waste drain.
The six-port (only 5 ports are used) injection valve unit is driven by a
high-speed hybrid stepper motor. During the sampling sequence, the valve unit
bypasses the autosampler, and connects flow from the pump to the column
directly. During injection and analysis, the valve unit directs the flow through
the well-plate sampler which ensures that all of the sample is injected onto the
column, and that the metering unit and needle are always free from sample
residue before the next sampling sequence begins. The injection valves from
the G1367A/68A and the G1377A/78A have a different stator head and a
different rotor seal. The volume of each valve is different.
Control of the vial/plate temperature in the thermostatted well-plate sampler
is achieved using an additional Agilent 1100 Series module; the ALS
thermostat.
The ALS thermostat contains Peltier-controlled heat-exchangers. A fan draws
air from the area above the sample vial tray of the well-plate sampler. It is then
blown through the fins of the cooling/heating module. There it is cooled or
heated according the temperature setting. The thermostatted air enters the
well-plate sampler through a recess underneath the special designed sample
tray. The air is then distributed evenly through the sample tray ensuring
effective temperature control, regardless of how many vials are in the tray. In
cooling mode condensation is generated on the cooled side of the Peltier
elements. This condensed water is safely guided into a waste bottle for
condensed water.
1100 Series WS MWS Reference Manual 199