When your HPLC or FPLC system is unable to reach the given flow rate, system pump service is required. In many cases, a faulty check valve is responsible for the malfunction. Trained personnel with access to the KNAUER ServiceTool can record the pressure profile of the pump for diagnostic purposes. In most cases, check valve malfunction can easily be detected.
The figure shows the pressure profile of an intact pump head (left) and a pump head with faulty check valves (right). KNAUER recommends regular service intervals to avoid any unscheduled downtime of your laboratory equipment.
Contact KNAUER customer support or your local KNAUER distributor for further information on service and spare parts.