24 Agilent InfinityLab LC Series 1260 Infinity II Isocratic- and Quaternary Pumps User Manual
1
Introduction
Overview of the Hydraulic Path
When turned on, the pump runs through an initialization procedure to
determine the upper dead position of the first piston. The first piston moves
slowly upwards into the mechanical stop of the pump chamber and from there
it moves back for a defined distance. The controller stores this piston position
in memory. After this initialization the pump starts operation with the set
parameters. The inlet valve opens and the down-moving piston draws solvent
into the first pump chamber. At the same time the second piston moves
upwards delivering to the system. After a controller-defined stroke length that
depends on the flow rate the drive motor is stopped and the inlet valve closes.
The motor direction is reversed and moves the first piston up until it reaches
the stored upper limit and at the same time the second piston moves
downwards. Then the sequence starts again moving the pistons up and down
between the two limits. During the up movement of the first piston the solvent
in the pump chamber is pressed through the outlet valve into the second pump
chamber. The second piston draws in half of the volume displaced by the first
piston and the remaining half volume is directly delivered to the system.
During the drawing stroke of the first piston, the second piston delivers the
drawn volume to the system.
Quaternary pumps: For solvent compositions from the solvent bottles A, B, C,
D the controller divides the length of the intake stroke in certain fractions in
which the gradient valve connects the specified solvent channel to the pump
input.
For specifications, see:
• isocratic pump: “Performance Specifications Agilent 1260 Infinity II
Isocratic Pump (G7110B)” on page 41
• quaternary pumps:
• “Performance Specifications Agilent 1260 Infinity II Quaternary Pump
(G7111B)” on page 45
• “Performance Specifications Agilent 1260 Infinity II Quaternary Pump
VL (G7111A)” on page 43
• Bio-inert pump: “Performance Specifications Agilent 1260 Infinity II
Bio-inert Pump (G5654A)” on page 47
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