1290 Infinity II High-Speed Pumps User Manual 14
1Introduction
Pump Principle
Pump Principle
Agilent 1290 Infinity II High-Speed Pumps feature a dual pump head design for
the generation of binary gradients.
The solvent selection valve allows the choice of two solvents per pump head.
However, this valve cannot be switched during a run.
Each pump head is equipped with two independently actuated pistons in series.
Delivery cycle:
1 Piston two moves forward to deliver solvent into the flow path. The flow-rate
is thereby determined by the speed of the piston.
At the same time, piston one draws solvent from the solvent reservoir. The
two piston chambers are isolated by a check valve (outlet ball valve).
2 Shortly before the end of the delivery stroke of piston two, piston one reverses
its direction. The check valve (passive inlet valve) at the inlet of piston
chamber one closes while the solvent in piston chamber one gets
compressed to system operating pressure.
3 Piston two reverses while piston one delivers the set flow rate into the flow
path and re-fills piston chamber two.
4 When piston two has reached the end of its intake stroke it reverses and the
delivery cycle starts again with step 1)
Reproducible solvent properties are maintained by an integrated two-channel
solvent degasser. It is located between the solvent selection valve and the pump
heads.
The pump automatically compensates for pressure and flow instabilities caused
by the complex relationship between solvent compressibility and system
pressure.
The only user interaction is selecting the appropriate solvent or solvent mixture
per channel from a drop-down list.
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