1290 Infinity II High-Speed Pumps User Manual 73
3Using the Pump
Setting up the Pump with the Instrument Control Interface
Advanced Settings
The High-Speed Pump advanced method setup parameters are in three sections:
• Minimum Stroke
• Compressibility
• Maximum Flow Gradient
Table 12 Advanced method parameters
Parameter Limits Description
Minimum Stroke 20 – 100 µL The stroke volume is used for optimizing between performance of the mod-
ule and seal life time. For performance, a low stroke volume is beneficial, as
it divides disturbances into smaller packages, but a larger volume extends
the lifetime of the pump seals.
If Automatic is selected, the pump tries to achieve an optimized stroke vol-
ume for the Jet Weaver geometry.
Synchronized: Select this option to synchronize the strokes for both chan-
nels; the values for Channel B are set to the same as those for Channel A.
This is done to avoid floating disturbances affecting instrument perfor-
mance.
Compressibility The compressibility of the mobile phase affects 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:
• Clear this check box to display the compressibility fields, which allow
you to enter compressibility values.
• When the check box is selected, the compressibility fields are not dis-
played, and the enhanced compressibility calibration is enabled. Select
the required calibrated solvents from the drop-down lists using the
combo boxes in the Solvents section.
Maximum Flow Gradi-
ent
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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