Device comprising a canned motor for measuring flow processes of measuring fluids

A device for measuring flow processes of a measuring fluid, the device comprising:

• an inlet;
• an outlet;
• a positive displacement housing;
• a drive unit comprising:
• a canned motor comprising a drive shaft, a rotor, and a stator comprising windings, and
• a can configured to separate an inner chamber, which is filled with the measuring fluid and which holds the drive shaft and the rotor, from an outer chamber, which holds the stator;
• a positive displacement flow meter configured to be driven by the drive unit, the positive displacement flow meter being arranged in the positive displacement housing;
• a bypass configured to bypass the positive displacement flow meter;
• a differential pressure sensor arranged in the bypass;
• and
• an evaluation and control unit configured to provide a control of the positive displacement flow meter based on a pressure difference existing at the differential pressure sensor.