User guide

7683B Sampler 12
Advanced User Guide 351
Setting Parameters for the ALS
Pressing 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.
4 Press [Mode/Type] to make selections for syringe size and
syringe plunger speed.
Injection volume Sample volume to be injected. Press
[Mode/Type] to select. The available volumes depend on the
syringe size configured.
• The selections represent 2%, 10%, 20%, 30%, 40%, and 50% of
syringe size.
• Turn the injection volume Off to disable the injector.
Viscosity delay (0-7 seconds) How long 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.
Inject Dispense Speed The speed of the syringe plunger during
injection. Enables you to reduce the average speed of the
plunger. Press [Mode/Type] to see the choices. The plunger speed
during the pump and waste dispensing does not change.
Sample pumps (0-15) How many times the syringe plunger is
moved up and down with the needle in the sample to expel air
bubbles and improve reproducibility.
Sample washes (0-15) How many times the syringe is rinsed
with sample before the injection. The wash volume is set by the
Solvent Saver setting.
Solvent A post washes (0-15) How many times the syringe is
washed with solvent A after injection.
Solvent A pre washes (0-15) How many times the syringe is
washed with solvent A before the sample washes.