Patent ID: 6453755
Filing Date: 2002-09-24
Classification: G01F

Abstract:
A magneto-inductive flow measuring method for a moving fluid comprising the steps ofproviding field coils for generating a magnetic field to which the fluid is exposed; providing means collecting a measuring signal proportional to the flow rate of the fluid; energizing the field coils in a gapped fashion so that each measuring period includes exactly one positive half-cycle of the magnetic field and exactly one negative half-cycle of the magnetic field and the measuring periods additionally encompass a time interval preceding the first half-cycle of the magnetic field and a time interval following the last half-cycle of the magnetic field; during the first positive half-cycle of the magnetic field and during the last negative half-cycle of the magnetic field, up-slope integrating the measuring signal so as to produce measured subvalues U1 and U2, respectively; during a time span corresponding to the duration of a half-cycle, up-slope integrating the measuring signal immediately before the first half-cycle, of the magnetic field; during a time span corresponding to the duration of a half-cycle, up-slope integrating the measuring signal immediately following the last half-cycle of the magnetic field so as to produce measured subvalues U1a and U2a, and calculating the measured value W associated with a given measuring period according to the equation W=U1âˆ’U2âˆ’&frac13; (U1aâˆ’U2a).