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A magnetic-inductive flowmeter, having a plurality of functional units and a housing common to all the functional units, wherein each functional unit has a measuring tube, a magnetic field generating device, and two measuring electrodes, and wherein a virtual connecting line of the two measuring ele

A magnetic-inductive flowmeter, having a plurality of functional units and a housing common to all the functional units, wherein each functional unit has a measuring tube, a magnetic field generating device, and two measuring electrodes, and wherein a virtual connecting line of the two measuring electrodes extends at least substantially at right angles to the direction of the magnetic field penetrating the measuring tube at right angles to the longitudinal axis of the measuring tube. In the housing, there is a common medium feed connection for the measuring tubes of all the functional units, a common power supply for the magnetic field generating device of all the functional units, and a common evaluation unit for the measuring electrodes of all the functional units. The magnetic field generating device has a field coil adjoined on both sides by a magnetic field guide part extending at right angles to the coil axis.

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1. A magnetic-inductive flow meter, comprising: a plurality of flowmeter units, each flowmeter unit having at least one measuring tube for a through-flow of an electrically conductive medium, a magnetic field generating apparatus for generating a magnetic field which runs at least also perpendicular

1. A magnetic-inductive flow meter, comprising: a plurality of flowmeter units, each flowmeter unit having at least one measuring tube for a through-flow of an electrically conductive medium, a magnetic field generating apparatus for generating a magnetic field which runs at least also perpendicular to a longitudinal axis of the measuring tube, and at least two measuring electrodes, a virtual connecting line of the two measuring electrodes running at least essentially perpendicular to a direction of the magnetic field permeating the measuring tube perpendicular to the longitudinal axis of the measuring tube, anda housing which is common to all of the flowmeter units,wherein at least one of a common medium inflow connection and a common medium outflow connection for the measuring tubes of all of the flowmeter units is provided in the housing; andwherein an evaluation unit is provided that is adapted to measure the electrode voltages which arise on the measuring electrodes of the flowmeter units separately, but in parallel. 2. The magnetic-inductive flow meter as claimed in claim 1, wherein a common power supply for the magnetic field generating apparatus of all flowmeter units is provided in the housing. 3. The magnetic-inductive flow meter as claimed in claim 1, wherein a common evaluation unit for the measuring electrodes of all of the flowmeter units is provided in the housing. 4. The magnetic-inductive flow meter as claimed in claim 1, wherein the magnetic field generating apparatus has a field coil that is connected on each side to a magnetic field guidance part which runs perpendicular to a coil axis of the field coil. 5. The magnetic-inductive flow meter as claimed in claim 4, wherein the field coil has a coil core of a material having good magnetic conductivity and wherein the magnetic field guidance parts are connected to the coil core. 6. The magnetic-inductive flow meter as claimed in claim 4, wherein each of the magnetic field guidance parts has a pole shoe on each of the ends thereof that is located away from the field coil, the pole shoes being aligned relative to one another and wherein the measuring tube runs between the pole shoes. 7. The magnetic-inductive flow meter as claimed in claim 6, wherein pole shoes have a diameter that is greater than that of the measuring tube. 8. The magnetic-inductive flow meter as claimed in claim 6, wherein a channel for the penetration of a connecting line and which leads to a measuring electrode is provided within each pole shoe. 9. The magnetic-inductive flow meter as claimed in claim 8, wherein the channel runs at an acute angle to the axis of pole shoe. 10. The magnetic-inductive flow meter as claimed in claim 6, wherein the measuring tube is provided on each side with a pole shoe chamber which is assigned to a respective one of the pole shoes. 11. The magnetic-inductive flow meter as claimed in claim 10, wherein the pole shoes and the pole shoe chambers have alignment and latching elements which correspond to one another. 12. The magnetic-inductive flow meter as claimed in claim 4, wherein there is a terminating disk on at least one side of the field coil, and wherein the terminating disk is provided with a groove for guiding and fixing a connecting line to the field coil. 13. A magnetic-inductive flow meter, according to claim 1, wherein the magnetic field generating apparatus all flowmeter units have at least one field coil, the field coils of all functional units being connected in series. 14. A magnetic-inductive flow meter, comprising: a plurality of flowmeter units, each flowmeter unit having at least one measuring tube for a through-flow of an electrically conductive medium, a magnetic field generating apparatus for generating a magnetic field which runs at least also perpendicular to a longitudinal axis of the measuring tube, and at least two measuring electrodes, a virtual connecting line of the two measuring electrodes running at least essentially perpendicular to a direction of the magnetic field permeating the measuring tube perpendicular to the longitudinal axis of the measuring tube, anda housing which is common to all of the flowmeter units,wherein a common power supply for the magnetic field generating apparatus of all flowmeter units is provided in the housing, andwherein a common evaluation unit for the measuring electrodes of all of the functional flowmeter units is provided in the housing, the evaluation unit being adapted to measure the electrode voltages which arise on the measuring electrodes of the flowmeter units separately, but in parallel. 15. A magnetic-inductive flow meter, according to claim 14, wherein at least one of a common medium inflow connection and a common medium outflow connection for the measuring tubes of all of the flowmeter units is provided in the housing. 16. A magnetic-inductive flow meter, comprising: a plurality of flowmeter units, each flowmeter unit having at least one measuring tube for a through-flow of an electrically conductive medium, a magnetic field generating apparatus for generating a magnetic field which runs at least also perpendicular to a longitudinal axis of the measuring tube, and at least two measuring electrodes, a virtual connecting line of the two measuring electrodes running at least essentially perpendicular to a direction of the magnetic field permeating the measuring tube perpendicular to the longitudinal axis of the measuring tube, anda housing which is common to all of the flowmeter units,wherein a common power supply for the magnetic field generating apparatus of all flowmeter units is provided in the housing; andwherein an evaluation unit is provided that is adapted to measure the electrode voltages which arise on the measuring electrodes of the flowmeter units separately, but in parallel. 17. A magnetic-inductive flow meter, according to claim 16, wherein the magnetic field generating apparatus all flowmeter units have at least one field coil, the field coils of all functional units being connected in series. 18. A magnetic-inductive flow meter, comprising: a plurality of flowmeter units, each flowmeter unit having at least one measuring tube for a through-flow of an electrically conductive medium, a magnetic field generating apparatus for generating a magnetic field which runs at least also perpendicular to a longitudinal axis of the measuring tube, and at least two measuring electrodes, a virtual connecting line of the two measuring electrodes running at least essentially perpendicular to a direction of the magnetic field permeating the measuring tube perpendicular to the longitudinal axis of the measuring tube, anda housing which is common to all of the flowmeter units,wherein a common evaluation unit for the measuring electrodes of all of the flowmeter units is provided in the housing, the evaluation unit being adapted to measure the electrode voltages which arise on the measuring electrodes of the flowmeter units separately, but in parallel.