1200 Series Quarternary Pump User Manual 13
Introduction
1
Overview of the Hydraulic Path
the same time moving the second plunger downwards. Then the sequence
starts again moving the plungers up and down between the two limits. During
the up movement of the first plunger the solvent in the chamber is pressed
through the outlet ball valve into the second chamber. The second plunger
draws in half of the volume displaced by the first plunger and the remaining
half volume is directly delivered into the system. During the drawing stroke of
the first plunger, the second plunger delivers the drawn volume into the
system.
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 quaternary pump specifications, see “Site Requirements and
Specifications” on page 21.
Tab le 1 Pump Details
Delay volume 800–1100 µl, dependent on back pressure
Materials in contact with mobile phase
DCGV PTFE
Pump head SST, gold, sapphire, ceramic
inlet valve SST, gold, sapphire, ruby, ceramic, PTFE
Outlet valve SST, gold, sapphire, ruby
Adapter SST, gold
Purge valve SST, gold, PTFE, ceramic, PEEK
Damping unit Gold, SST
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