METHOD OF AND DEVICE FOR METERING CONDUCTING MEDIUM FLOW RATE Russian patent published in 1995 - IPC

FIELD: liquid flow metering technology. SUBSTANCE: electrode signal is differentiated before averaging and its polarity is reversed in quadrature with low-frequency component of magnetic field. Flux density components of magnetic field are determined from mathematical expression. Generator 1 shapes signal arriving at input of differential amplifier 2 whose output yields signal passed to field winding of flow transducer 3. Flux-density transformer is built in active zone of transducer 3 and reference signal is built up across its output. This signal goes via follower 4 to inverting input of differential amplifier 2 to shape feedback signal of this amplifier. Amplifier gain does not depend on equivalent parameters of flow transducer field circuit and depends only on feedback circuit characteristics. EFFECT: reduced power loss. 2 cl, 2 dwg