Table of Contents
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1
Introduction
Pump Principle
the correct volumetric flow while sample passes through the detector it is
necessary to correct for density related flow inaccuracies in the pump module.
In order to always deliver the best possible pressure stability, the pump
constantly tunes the delivery cycle for elasticity and dead volume effects. With
this feature the pump is able to deliver a stable and accurate flow without
requiring individual calibration settings. A further feature of the control and
compensation algorithm is leak correction. With this it is even possible to
compensate for minor leaks in primary pump chamber (inlet valve and seal),
without the performance of the pump being affected.
To increase the robustness of the pump it uses a fast defill function which
reduces the delivery time of the primary piston, thereby reducing the net
effects of leaks considerably. Furthermore each pump channel has only two
valves on its two pump heads which also reduce the potential of failures. In
order to reduce stresses on the pump hardware, it uses a smooth motion
control, which slowly increases or decreases the speed of the pistons to
prevent shock movements. In order to be able to control these movements a
high resolution encoder unit is attached to the pump drives which resolves a
revolution into 65000 steps, and each step translates to a volume of about
300 pl.
14
Agilent 1290 Infinity Binary Pump User Manual
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