Abstract: The present Coriolis mass/flow density meter and method for measuring a mass flow rate of a medium flowing through a flow tube of a Coriolis mass flow meter provide measurement results which are independent of the current velocity field of the medium to be measured. At least one measuring tube is provided, through which the medium flows, which oscillates during operation. A means for measuring the oscillations is arranged at an inlet end of the measuring tube and provides a measurement signal. A second means for measuring the oscillations is arranged at the outlet of the measuring tube and provides a second measurement signal. A third measuring means provides a third measurement signal which represents the current Reynolds number of the flowing medium, Evaluation electronics generate a measurement value representing the mass through-flow. The evaluation electronics also generate a measurement value representing the current density of the medium.

Abstract: The accuracy of this method is comparable to that of the measurement of liquids. The fluid flows through at least one flow tube (4) of a mass flow sensor (1) of a Coriolis mass flow/density meter, which flow tube vibrates at a frequency f being equal to or in the vicinity of the instantaneous mechanical resonance frequency of the flow tube (4) having a vibrator (16). A first and second vibration sensor (17, 18) are attached to the flow tube, deliver a first and a second sensor signal (x17, x18), and are positioned at a given distance from each other in the direction of flow. The flow tube (4) is surrounded by a support frame or a support tube (15) or held by a support plate so as to be capable of vibrating. The sensor signals (x17, x18) have a phase difference from which a signal qf is formed; it is multiplied by a function f(c) dependent on the speed of sound c in the fluid which can be approximated by a function f(Tm) dependent on the current temperature Tm of the flow tube (4).