A device for the magneto-inductive measuring of the flow rate of a liquid medium is disclosed wherein a cylindrical probe is immersed in a tube or in an open channel. The probe contains a cylindrical measuring channel through which flows the fluid to be measured. The probe includes a coil, which generates...http://www.google.ca/patents/US4554828?utm_source=gb-gplus-sharePatent US4554828 - Measuring device for the magneto-inductive measuring of the flow rate of a liquid medium
