Coriolis mass-flow measuring device

US7040180B2 · kind B2 · utility

Assignee

• Endress+Hauser Flowtec AG · CH

Inventors

• Christian Matt · Lörrach, DE
• Michael Fuchs · Bad Wörishofen, DE
• Wolfgang Drahm · Erding, DE
• Alfred Wenger · Neftenbach, CH

Key dates

• Filing date: Dec 7, 2004
• Grant date: May 9, 2006
• Expiry date: Dec 7, 2024

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F1/849
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A Coriolis mass-flow/density meter includes at least one measuring tube, which is traversed in operation by medium. A support structure of the Coriolis mass-flow/density meter is fixed at an inlet end and at an outlet end of the measuring tube and thus clamps the measuring tube such that it can oscillate. In operation, the measuring tube is caused by means of an exciter arrangement to oscillate with mechanical oscillations, especially bending oscillations. Furthermore, the Coriolis mass-flow/density meter includes structure 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 (xs1, xs2) and representing an uncorrected mass flow rate. The evaluation electronics also produces a correction value (XK) for the intermediate value (X′m). The correction value (XK) is derived from the measurement signals (xs1, xs2), especially from a second measured value (Xρ) representing a density of the medium and especially likewise produced in the evaluation electronics. Moreover, the evaluation electronics produces a measured value (Xm) r…