Special Topics
Performing cool on-column injection onto 250-µm and 320-µm columns
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MANUAL
SEQUENCE
The MANUAL SEQUENCE command bypasses the normal
sample sequencing performed by the automatic liquid
sampler. Once manual sequencing mode has been
activated, it is possible to manipulate sample bottles,
moving them to and from the injectors with the MOVE
command, and then inject from the bottles currently in the
injectors simply by starting a sequence. In manual
sequencing mode, the injections/bottle first bottle and last
bottle setpoints are all ignored, and each injector will make
just one injection but only if a bottle has been moved to its
turret.
AUTO
SEQUENCE
The AUTO SEQUENCE command returns the automatic
liquid sampler to normal sequencing mode after being
placed in manual mode.
RETURN
BOTTLES
The RETURN BOTTLES command is a quick way to return
bottles that have been moved out of the tray back to the
positions where they originated. Bottles that are already in
the tray are not affected even if they have been moved
there from somewhere else. If a bottle has been in two or
more positions within the tray, then only the most recent
one will be remembered, and that is the one to which it will
be returned. This command is also very useful if an error
has occurred or a sequence has been aborted, and it is not
known exactly where all the bottles are presently located.
TURRET x,y This command rotates the front injector turret to position x
and the rear injector turret to position y.
The TURRET command controls the positioning of the
injector turrets. Normally at the end of any injector
operation, the sample turret is returned to its rest position
with its motor de-energized so there is only a small residual
holding torque to keep it in that position. By using the
TURRET command, it is possible to move the turret to any
one of ten other positions and leave the motor energized to
provide a high-holding torque.
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