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(A) Schematic drawing of the fermentation setup using the online impedance probe. A peristaltic pump establishes the flow through the probe; (B) Schematic drawing of the prototype online probe during fermentation. The stainless steel electrodes are sealed in borosilicate tubing (NW16KF) and a polymethymetacrylate mantle. An electrical connection is established using a four-point measuring method to decrease cable induction and setup interferences.
