1290 Infinity Quaternary Pump User Manual 65
Using the Pump
4
Setting up the Pump with the Instrument Control Interface
Advanced Settings
The Quaternary Pump advanced method setup parameters are in five
sections:
• Minimum Stroke
• Compressibility
• Maximum Flow Gradient
• Primary Channel
• Mixer Selection
Tabl e 5 Advanced method parameters
Parameter Limits Description
Minimum Stroke 20 – 100 µL The Stroke Volume is used for optimizing between performance of the
module and seal life time. For performance a low stroke volume is beneficial,
as it divides disturbances into smaller packages, but a larger volume is
extending the life time of the pump seals.
If Automatic is activated, the pump tries to achieve an optimized stroke
volume for the Jet Weaver geometry.
Compressibility The compressibility of the mobile phase has an effect on the performance of
the pump. For best flow accuracy and mixing performance, you can set the
parameter according to the mobile phase being used.
Use solvent types:
• Select this check box (recommended) for using the enhanced and
automatic compressibility calibration. Then select the calibrated solvent
from the drop-down lists using the combo boxes in the Solvents section.
Using this checkbox hides compressibility fields for manual settings.
• Clear this check box to display the compressibility fields, which allow
you to enter manual compressibility values, which are constant over
pressure. This setting is available for method backward compatibility e.g.
from 1260 Infinity pumps. For best performance, use solvent types.
Maximum Flow
Gradient
1.000 –
1000.000 mL/min/min
in steps of
0.001 mL/min/min
Default value:
100.000 mL/min/min
You can set a limit on the rate of change of the solvent flow to protect your
analytical column. You can set individual values for Flow ramp up and Flow
ramp down.
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