Control arrangement for controlling a piston pump unit for liquid chromatography

US9624923B2 · kind B2 · utility

Assignee

• Dionex Softron GmbH · DE

Inventors

• Gervin Ruegenberg · Munich, DE
• Richard Schloderer · Krailling, DE
• Werner Tuchan · Munich, DE

Key dates

• Filing date: Jun 14, 2013
• Grant date: Apr 18, 2017
• Expiry date: Apr 28, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2030/326
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A control arrangement for controlling a piston pump unit for liquid chromatography, in particular high-performance liquid chromatography, is described. The piston pump unit has at least two piston-cylinder units which operate cyclically in a phase-offset manner and generate, at an outlet port, a predetermined flow of a liquid medium to be delivered. A system pressure is established at the outlet port, irrespective of an associated fluid load resistance. The control arrangement is configured to record the pressure in the cylinder volume of at least a first of the at least two piston-cylinder units. During a measurement phase of the compression phase of the first piston-cylinder unit or during a measurement phase of the decompression phase of the first piston-cylinder unit, the control arrangement stops the drive device for the first piston-cylinder unit for a predetermined time period and in the process records measurement data which characterize the time profile of the pressure.