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We developed and applied a micropump for liquid flows of 0–150nL/min. The operating principle of this pump is based on the Hagen–Poiseuille law. The main advantages of this pump are that an accurate continuous flow rate can be achieved, it is cheap to manufacture, easy to parallelize and easy to integrate in microtiter plates. Experiments at different flow rates showed that the flow rate remained stable in time and the measured flow rates corresponded very well to the Hagen–Poiseuille law. The applicability of the pump for reproducible feeding of microbioreactors was shown in a fed-batch system with a simple chemical reaction. Thereby the Hagen–Poiseuille pump was connected to a microbioreactor with a working volume of 100μL. The microreactor was filled with a H₂SO₄ solution which was fed with a Na₂CO₃ solution at a constant rate, while measuring the CO₂ release on-line. This resulted in a stable CO …