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My pump P2.1S/4.1S shows a flow rate in analog mode, but does not start pumping. What's wrong?

When controlling the pump via analog in (e.g. with a flow meter), the eluent delivery must be started using the start-in connector. Simply short-circuit START-IN and GROUND and press the Start-stop key to start delivery.

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Based in Berlin, KNAUER has been serving the sciences since 1962. We develop and manufacture scientific instruments of superior quality for liquid chromatography systems and components, including:

Analytical HPLC / UHPLC
Preparative HPLC
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