In-line measuring devices and method for compensation...

Details In-line measuring devices and method for compensation... In-line measuring devices and method for compensation...

2006-05-18

2008-08-19

Patel, Harshad (Department: 2855)

Measuring and testing

Volume or rate of flow

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

C073S861355

Reexamination Certificate

active

07412903

ABSTRACT:
An inline measuring device comprises a vibratory-type transducer and a measuring device electronics electrically coupled with the vibratory-type transducer. The vibratory-type transducer includes at least one measuring tube being inserted into the course of a pipeline and serving for conducting a mixture to be measured. An exciter arrangement acting on the measuring tube for causing the at least one measuring tube to vibrate and a sensor arrangement sensing vibrations of the at least one measuring tube and delivering at least one oscillation measurement signal representing oscillations of the measuring tube. The measuring device electronics delivers an excitation current driving the exciter arrangement. Further, the inline measuring device electronics is adapted to produce a measured value representing the physical, measured quantity of the mixture to be measured. Therefor, the measuring device electronics estimates from the excitation current and from said at least one oscillation measurement signal a Coriolis coupling coefficient. This Coriolis coupling coefficient corresponds with an instantaneous coupling between a first natural eigenmode of the measuring tube currently driven by the exciter arrangement and a second natural eigenmode of said measurement tube. In this second eigenmode the measurement tube has an eigenform corresponding with a mode of vibration caused by Coriolis forces induced in the flowing mixture. Due to a variation of a concentration of at least one of a component of the mixture the Coriolis coupling coefficient varies in time.

REFERENCES:
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patent: 2006/0272428 (2006-12-01), Rieder et al.
patent: 2007/0180929 (2007-08-01), Rieder et al.
patent: 2007/0186686 (2007-08-01), Drahm et al.
patent: 10 2004 056 235 (2006-04-01), None
patent: WO 2004/027350 (2004-04-01), None
R.P. Liu et al., “A neural network to correct mass flow errors caused by two-phase flow in a digital coriolis mass flowmeter”, pp. 53-63, XP-002355593, 2001.
H. Raszillier et al., “Coriolis-effect in mass flow metering”, pp. 192-214, Archive Mechanics, XP009057633, 1991.

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