Process for operating a measurement device of the vibration type

US7689372B2 · kind B2 · utility

Assignee

• ABB PATENT GMBH · DE

Inventors

• Rene Friedrichs · Göttingen, DE
• Lothar Deppe · Oettingen, DE
• Steffen Keller · Konstanz, DE
• Joerg Gebhardt · Mainz, DE
• Frank Kassubek · Rheinfelden (Baden), DE

Key dates

• Filing date: Dec 13, 2007
• Grant date: Mar 30, 2010
• Expiry date: Sep 23, 2028

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F1/8436
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A process is disclosed for operating a measurement device of the vibration type in which at least one exciter arrangement excites the system to vibration and from the vibration parameters, a measurement quantity of a measurement medium in a tube system is determined. A time-dependent force f(t)=F sin(ωt)+g(t) with at least one sinusoidal component with an adjustable frequency ω can be used which acts on at least one vibration-capable part of the measurement device of the vibration type. A response signal of the vibration-capable part, (e.g., its time dependent velocity v(t)=V sin(ωt+ψ)+h(t)) can be measured, and a phase shift Ψ between the response signal and the force f of a signal component which oscillates with a frequency ω is determined. The phase shift Ψ can be used as the input for a frequency controller so that the excitation frequency is automatically adjusted as a function of Ψ.