AM-MFM Electromagnetic Flow Meter

The medium is the conductor. A pair of electrodes in the pipe wall reads the voltage the liquid generates as it crosses a magnetic field, so nothing sits in the flow path, nothing wears, and the reading does not depend on pressure, density or viscosity.

That makes the choice of this meter three decisions, not fifteen: the liquid has to carry at least 5 µS/cm, the pipe has to run full, and the liner and the electrode have to survive the medium. The rest — DN6 to DN2600, thread, flange or tri-clamp, integrated or separated converter — is configuration.