Patent ID: 7357039

Claim:
A Coriolis mass flow measuring device for measuring the mass flow rate of a medium, said medium flowing in a pipeline and said medium including a first phase and a second phase, said Coriolis mass flow measuring device comprising: a vibratory transducer, said vibratory transducer including at least one measuring tube to be interposed in the pipeline for guiding the medium to be measured, an exciter arrangement acting on said at least one measuring tube for causing said at least one measuring tube to vibrate, and a sensor arrangement for registering vibrations of said at least one measuring tube and for generating a first oscillation measurement signal representing oscillations of said at least one measuring tube at the inlet end and for generating a second oscillation measurement signal representing oscillations of said at least one measuring tube at the outlet end; and measuring device electronics electrically coupled to said vibratory transducer, said measuring device electronics delivering an exciter current for driving the exciter arrangement, and said measuring device electronics producing a correction value based on a viscosity of the medium and an apparent viscosity derived from said exciter current, wherein the measuring device electronics uses said first and second oscillation measurement signals and said correction value to produce a mass flow rate measurement value representing a mass flow rate to be measured.