A method for designing a magneto-inductive flowmeter for measuring the flow velocity u or the volume flow V of a medium, wherein the magneto-inductive flowmeter comprises: - A measuring tube, for conducting the medium in a longitudinal direction defined by a measuring tube axis, wherein the measuring tube has an inlet-side end face and an outlet-side end face which delimit the measuring tube in the longitudinal direction; - at least one magnetic-field-generating device positioned in the direction of a cross-section of the measuring tube for generating a magnetic field in the medium essentially perpendicular to the longitudinal direction; ∘ wherein the magnetic-field-generating device is characterized by a segment which rests on the measuring tube or is spaced at a specified minimum distance from it and couples the magnetic field into the medium, ∘ wherein the segment in the cross-section of the measuring tube encompasses the measuring tube at a maximum arc angle β, - an electrode system with at least two pairs of electrodes which are configured to detect a voltage induced in the medium perpendicular to the magnetic field and to the longitudinal direction; ∘ wherein a vertical measuring tube longitudinal plane divides the measuring tube into a first side and a second side, ∘ wherein a first electrode (6.1) of each pair of electrodes is located on the first side of the measuring tube, ∘ wherein a second electrode (6.2) of each pair of electrodes is located on the second side, ∘ wherein an angle α in the cross-section of the measuring tube creates a minimum circular sector, in which the electrodes 6.1, 6.2) located on each side of the measuring tube are distributed, ∘ wherein the following applies to angle α: 30° ≤ α ≤ 60°, and the following applies to angle 6: 70° ≤ β ≤ 80°, wherein the method comprises the following process steps: - Adjusting angles α and β in such a way that a measurement error of the flow velocity becomes minimal in a test measurement with a single fault, ∘ wherein the fault is generated by an orifice plate or a 90° pipe elbow (90°R); and - working out a pair of angles from angles α and β, the maximum measurement error of which is minimal for all test measurements that are performed. - A measuring tube, for conducting the medium in a longitudinal direction defined by a measuring tube axis, wherein the measuring tube has an inlet-side end face and an outlet-side end face which delimit the measuring tube in the longitudinal direction; - at least one magnetic-field-generating device positioned in the direction of a cross-section of the measuring tube for generating a magnetic field in the medium essentially perpendicular to the longitudinal direction; ∘ wherein the magnetic-field-generating device is characterized by a segment which rests on the measuring tube or is spaced at a specified minimum distance from it and couples the magnetic field into the medium, ∘ wherein the segment in the cross-section of the measuring tube encompasses the measuring tube at a maximum arc angle β, ∘ wherein the magnetic-field-generating device is characterized by a segment which rests on the measuring tube or is spaced at a specified minimum distance from it and couples the magnetic field into the medium, ∘ wherein the segment in the cross-section of the measuring tube encompasses the measuring tube at a maximum arc angle β, - an electrode system with at least two pairs of electrodes which are configured to detect a voltage induced in the medium perpendicular to the magnetic field and to the longitudinal direction; ∘ wherein a vertical measuring tube longitudinal plane divides the measuring tube into a first side and a second side, ∘ wherein a first electrode (6.1) of each pair of electrodes is located on the first side of the measuring tube, ∘ wherein a second electrode (6.2) of each pair of electrodes is located on the second side, ∘ wherein an angle α in the cross-section of the measuring tube creates a minimum circular sector, in which the electrodes 6.1, 6.2) located on each side of the measuring tube are distributed, ∘ wherein the following applies to angle α: 30° ≤ α ≤ 60°, and the following applies to angle 6: 70° ≤ β ≤ 80°, ∘ wherein a vertical measuring tube longitudinal plane divides the measuring tube into a first side and a second side, ∘ wherein a first electrode (6.1) of each pair of electrodes is located on the first side of the measuring tube, ∘ wherein a second electrode (6.2) of each pair of electrodes is located on the second side, ∘ wherein an angle α in the cross-section of the measuring tube creates a minimum circular sector, in which the electrodes 6.1, 6.2) located on each side of the measuring tube are distributed, ∘ wherein the following applies to angle α: 30° ≤ α ≤ 60°, and the following applies to angle 6: 70° ≤ β ≤ 80°, - Adjusting angles α and β in such a way that a measurement error of the flow velocity becomes minimal in a test measurement with a single fault, ∘ wherein the fault is generated by an orifice plate or a 90° pipe elbow (90°R); and ∘ wherein the fault is generated by an orifice plate or a 90° pipe elbow (90°R); and - working out a pair of angles from angles α and β, the maximum measurement error of which is minimal for all test measurements that are performed.