Patent ID: 7040180

Claim:
A Coriolis mass flow meter, especially a Coriolis mass flow/density meter, for measuring a mass flow rate of a medium, especially a two, or more, phase medium, flowing in a pipeline, which Coriolis mass flow meter comprises: at least one measuring tube inserted into the course of the pipeline and traversed by the medium during operation, said at least one measuring tube having an inlet end and an outlet end; support means, which is fixed at said inlet end and said outlet end of said measuring tube and thus holds said measuring tube such that it can oscillate; an exciter arrangement, which causes said measuring tube to execute mechanical oscillations, especially bending oscillations, during operation; oscillation sensors for producing a first oscillation measurement signal (x s1 ) representing inlet-end oscillations of said measuring tube, as well as a second oscillation measurement signal (x S2 ) representing outlet-end oscillations of said measuring tube; and evaluation electronics, which produces a first intermediate value (X′ m ) derived from said first and said second oscillation measurement signals (x s1 , x s2 ) and provisionally representing the mass flow rate to be measured, as well as producing a correction value (X K ) derived from said first intermediate value (X′ m ) for correcting said first intermediate value (X′ m ), and which determines, by means of said first intermediate value (X′ m ) and said correction value (X K ), a mass flow rate, measured value (X m ) representing a mass flow rate to be measured, wherein: said evaluation electronics produces said correction value (X K ) on the basis of a second intermediate value (X 2 ) derived from said first intermediate value (X′ m ) said second intermediate value represents a function value of a power function, X′ m n , with said intermediate value (X′ m ) as base and an, especially rational, exponent (n), which is smaller than zero.