26 Agilent InfinityLab LC Series 1260 Infinity II Isocratic- and Quaternary Pumps User Manual
1
Introduction
Overview of the Hydraulic Path
How Does Variable Stroke Volume Work?
Due to the compression of the pump-chamber volume each piston stroke of the
pump will generate a small pressure pulsation, influencing the flow stability of
the pump. The amplitude of the pressure pulsation depends mainly on the
stroke volume and the compressibility compensation for the solvent in use.
Small stroke volumes generate pressure pulsations of smaller amplitude than
higher stroke volumes at the same flow rate. In addition, the frequency of the
pressure pulsations is higher. This decreases the influence of flow pulsations
on quantitative results.
In gradient mode, smaller stroke volumes result in a lower flow ripple and will
improve composition ripple.
The module uses a processor-controlled spindle system for driving its pistons.
The normal stroke volume is optimized for the selected flow rate. Small flow
rates use a small stroke volume while higher flow rates use a higher stroke
volume.
By default, the stroke volume for the pump is set to AUTO mode. This means
that the stroke is optimized for the flow rate in use. A change to larger stroke
volumes is possible but not recommended.
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