Abstract: The design and properties of a porous tubular electrode, in which effective mass transport is ensured by a stirrer rotating inside the tube, are described. High currents are possible owing to the high surface area and mass transport rates. The dependence of the limiting current and the degree of conversion on stirring and flow rate and on electrode length are described. A hydrodynamic modulation mode, based on measuring the current difference while switching the stirrer on and off, is used to correct for background. The cell was used for the determination of caffeic acid, paracetamol, dopamine and Fe(CN)64- in flow injection and continuous-flow analyzes, with detection limits at the nM level.