The Automatic Liquid Sampler Part 2. The 7683 ALS
Injector control table
212
Viscosity delay—How many seconds the plunger pauses at the top of the
pump and injection strokes. For viscous samples, the pause allows the sample
to flow into the vacuum created in the syringe.
Number of sample washes—How many times the syringe is rinsed with
sample before the injection. The injector lowers the needle into the sample vial,
fills the syringe to eight-tenths its full volume, and empties it into one of the
waste bottles.
Number of solvent A washes—How many times the syringe is rinsed with
solvent from the solvent A bottle.
Number of solvent B washes—How many times the syringe is rinsed with
solvent from the solvent B bottle.
Slow plunger—The speed of the syringe plunger during injection. Enables
you to reduce the average speed of the plunger and hold the syringe needle in
the inlet for 4 seconds after the injection. Turning the setpoint On pushes at a
rate of about 5 µL/sec (with a 10 µL syringe)—Off is about 20 times faster. The
plunger speed during the pump and waste dispensing does not change.
Dwell times—How long, in minutes, the needle remains in the inlet before
or after the injection.
Sampling offset—Enables variable sampling depth.
Procedure: Editing injector setpoints
Accessing either of the injector keys allows you to edit injector control setpoints,
such as injection volumes, sample and solvent washes, etc.
To edit the injector setpoints:
1. Press [Front Injector] or [Back Injector].
2. Scroll to the desired setpoint.
3. Enter a setpoint value or turn the setpoint on or off.
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