Nuclear magnetic flowmeter

A nuclear magnetic flowmeter for measuring the flow rate of a medium flowing through a measuring tube, comprising:

• a magnetization apparatus for magnetization and for variation of the magnetization of the medium flowing through the measuring tube over a magnetization distance along a longitudinal axis of the measuring tube in a manner producing at least one magnetic field to magnetize the medium,
• the magnetization apparatus being provided with permanent magnets and
• having at least two magnetization segments which are located in succession in the direction of the longitudinal axis of the measuring tube and which produce the at least one magnetic field in a single direction and has a magnetic field strength which can be different over the length of the magnetization distance in the medium over the entire distance, and
• wherein each of the magnetization segments has an inner carrier which is equipped with permanent magnets and an outer carrier which is equipped with permanent magnets, and wherein the inner carrier is located surrounding the measuring tube and the outer carrier is placed surrounding the inner carrier, and wherein the orientation between the inner carrier and the outer carrier is adjustable by rotation of at least one of the inner carrier and the outer carrier around an axis of rotation of the respective segment for variation of the magnetic field strength in the medium and also for variation of the magnetization of the medium.