User manual

14 1260 Nanoflow Pump User Manual
1 Introduction to the 1260 Infinity Nanoflow Pump
Introduction to the Pump
For pump specifications, see “Performance Specifications” on page 38.
How Does Compressibility Compensation Work?
The compressibility of the solvents in use will affect retention-time stability
when the back pressure in the system changes (for example, aging of column).
In order to minimize this effect, the pump provides a compressibility
compensation feature which optimizes the flow stability according to the
solvent type. The compressibility compensation is set to a default value for
each pump head independently. The compensation value for each pump head
can be changed through the user interface.
Without a compressibility compensation the following will happen during a
stroke of the first piston. The pressure in the piston chamber increases and
the volume in the chamber will be compressed depending on backpressure and
solvent type. The volume displaced into the system will be reduced by the
compressed volume.
When a compressibility compensation value for a pump head is set, the pump
processor calculates a compensation volume that depends on the system
pressure and the selected compressibility value. This compensation volume is
added to the delivery stroke of the first piston.
Tabl e 1 Pump Details
Materials in contact with mobile phase
Pump head SST, gold, sapphire, ceramic
Active inlet valve SST, gold, sapphire, ruby, ceramic, PTFE
Outlet valve SST, gold, sapphire, ruby, tantalum
Adapter SST, gold
EMPV SST, ruby, sapphire, PEEK
Flow sensor SST
Damping unit Gold, SST
Capillaries Fused silica