I want to pump water with my AZURA P2.1S/P4.1S pump (50 ml ceramic), but I experience flow rate decrease over time. What should I do?

When working with aqueous solutions at flow rates greater than 20 ml/min, the 50 ml ceramic pump head requires a backpressure of 80 bar. At lower backpressure, a decrease in flow rate may occur. To generate the required backpressure, a restriction capillary or backpressure regulator (A70088) can be used.

To improve the flow rate accuracy when using water, recalibration of the pump head can be performed by an authorized service technician. If you want to learn how to calibrate the pump head yourself, please contact KNAUER Academy for individual training (academy@knauer.net).

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Based in Berlin, KNAUER is a medium-sized company that has been serving the sciences since 1962. We are a developer and manufacturer of scientific instruments of superior quality for liquid chromatography (LC), liquid dosing and other laboratory tasks. The product range includes systems, engineering solutions and components for:

Analytical HPLC / UHPLC
Preparative HPLC
Fast protein liquid chromatography (FPLC)
Multi-column Chromatography / SMB
High-pressure dosing solutions
Lipid nanoparticle (LNP) production and research

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