Special Topics
Performing cool on-column injection onto 250-µm and 320-µm columns
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• If you use a built-in pump, it must be suitable for external circulation of
liquid and for connection of 6.35 mm id (1/4-inch) tubing.
• If you use a pressure pump, it must maintain a pressure between 1.5 and
2.5 psi.
• If you use a suction pump, the pump vacuum cannot exceed -4 psi.
• Use distilled water plus a maximum of 3% antifreeze.
Tray control commands
Programming devices can be used to tell the tray where to deliver and retrieve
sample vials. The most common configuration is a device that is part of the
Instrument Network (INET) and uses BASIC as a programming language. For
example, you can use a 3396 integrator with BASIC to send special commands
to the tray.
This section contains some general rules about using tray control commands, a
description of their syntax, and an example of how to use them with a bar code
reader.
General rules
• At least three letters of the tray commands must be used. Additional
letters, up to the full length of the word, may be used for improved
readability. For example, the MANUAL command may be entered as MAN,
MANU, MANUA, or MANUAL.
• Unlike other setpoints in the automatic liquid sampler, manual sequencing
mode is replaced with the normal sequencing mode after the power is
turned off.
• It is recommended that the turrets not be left in an energized state longer
than necessary to minimize power consumption and temperature changes.
Also, if the turret is not returned to position 0 before the next injector
operation (either an injection sequence or a MOVE, RETURN BOTTLES,
or TURRET command), then there will be an additional delay while the
turret goes through a homing operation.
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