Agilent Technologies 1290 Infinity LC System System Manual And Quick Reference page 26

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The Agilent 1290 Infinity LC System - Product Description
System Components
Figure 12
Each pump head is a dual piston in-series design utilizing novel firmware
control and novel piston material, silicon carbide, which efficiently removes
heat from the pump. The capillary joining the primary piston to the secondary
piston has an integrated heat exchanger to remove the heat created at high
pressure and flow. Each pump head has one passive inlet valve and one
passive outlet valve on the primary piston chamber. Each piston is
independently and precisely driven by a motor with 65000 steps giving 300
picolitres displacement per step.
The movement of the pistons is under intelligent control with a feedback loop
to ensure that this active damping of pressure pulsation results in a ripple-free
flow. The piston drive tunes itself for the compressibility characteristics of the
solvent and the hydraulic characteristics of the system to maintain the
ripple-free state. This in conjunction with the smooth-motion control, which
reduces pressure pulsation caused by the movement of the piston, and the
low-volume efficient mixing ensure that pump noise on UV traces is the lowest
possible. A dedicated microprocessor in the pump takes care of the smooth
motion control and optimization of the pistons' motion for real-time
optimization based on the static and dynamic parameters. In addition to the
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Parts identification and schematic of the 1290 Infinity Binary Pump
Agilent 1290 Infinity LC System Manual and Quick Reference