Coriolis mass flow measuring device

Details Coriolis mass flow measuring device Coriolis mass flow measuring device

2007-02-27

2007-02-27

Patel, Harshad (Department: 2855)

Measuring and testing

Volume or rate of flow

Mass flow by imparting angular or transverse momentum to the...

Reexamination Certificate

active

11004830

ABSTRACT:
A Coriolis mass-flow/density meter includes at least one measuring tube through which a two, or more, phase medium during operation. A support means of the Coriolis mass-flow/density meter is fixed to an inlet end and an outlet end of the measuring tube and thus holds the tube such that it can oscillate. During operation, the measuring tube is made to oscillate with mechanical oscillations, especially bending oscillations, by means of an exciter arrangement. Additionally, the Coriolis mass-flow/density meter includes means for producing measurement signals (xs1, xs2) representing inlet end and outlet end oscillations of the measuring tube. An evaluation electronics produces an intermediate value (X′m) derived from the measurement signals (x1, xs2) and representing a provisionally determined mass flow rate. The evaluation electronics also produces a second intermediate value (X2) derived from the measurement signals (xs1, xs2), especially from a second measured value (Xρ) representing a density of the medium and likewise produced in the evaluation electronics. The second intermediate value (X2) represents a measure for an amount of a phase of the medium. Using the intermediate value (X2), a correction value (XK) for the first intermediate value (X′m) is determined, with the correction value (XK) being selected by means of the intermediate value (X2) from a plurality of preset values stored in a table memory. Additionally, the evaluation electronics produces a measured value (Xm) representing a mass flow rate through use of the intermediate value (X′m) and the correction value (XK).

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