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The core of the liquid chromatography system is the pump, which is used to transport the mobile phase solvent and the sample to the column. The chromatographic infusion pump provides the pressure needed to overcome the resistance of the column, while providing a stable pressure (no pulsation) at a precisely controlled flow rate.
The binary gradient pump has two two-stage pumps, mixing two mobile phases with different polarity at any ratio to produce isocratic or gradient elution.