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Process for operating a Coriolis mass flow rate measurement device

  • US 7,640,813 B2
  • Filed: 04/12/2007
  • Issued: 01/05/2010
  • Est. Priority Date: 04/12/2006
  • Status: Active Grant
First Claim
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1. Process for operating a Coriolis mass flow rate measurement device, with at least one measurement tube through which a medium flows, comprising the steps of:

  • subjecting the at least one measurement tube to vibration excitation leading to vibrations of the measurement tube,using both a first indicator quantity and an additional, second indicator quantity that is independent of the first indicator quantity for detection of multiphase flow,wherein the first indicator quantity is based on one ofa) a quantity based on friction losses within the multiphase flow, wherein to determine a quantity based on friction losses within a multiphase flow, at least one value from the value of drive power necessary for producing vibration excitation of the at least one measurement tube, drive amplitude, resulting vibration amplitude and at least one quantity derived from at least one of said values is evaluated,b) a quantity based on inhomogeneity of the multiphase flow, wherein a quantity based on the inhomogeneity of the multiphase flow is obtained from noise of an internal signal of the Coriolis mass flow rate measurement device and wherein the internal signal of the Coriolis mass flow rate measurement device is at least one value from the values of;

    a phase difference between two signals detected at detection sites spaced apart from one another in the lengthwise direction of the at least one measurement tube for the resulting vibrations, the natural frequency of the at least one measurement tube through which flow takes place, a phase difference between the vibration excitation and resulting vibrations, an instantaneous amplitude of drive power per vibration amplitude and at least one quantity derived from at least one of said values,c) a quantity based on modeling of the nominal behavior of the Coriolis mass flow rate measurement device, wherein the deviation of a detected signal from a signal which is expected based on modeling is used for determining one of said quantities based on modeling of the nominal behavior of the Coriolis mass flow rate measurement device, andd) a quantity based on transit time effects of the multiphase flow between two detection sites which are spaced apart from one another in the lengthwise direction of the at least one measurement tube for the resulting vibrations, wherein to determine such a quantity, the deviation of a computed transit time for the resulting vibrations based on the determined mass flow rate is determined by the transit time determined for the multiphase flow, andwherein the second indicator quantity is based on another of said quantities a)-d).

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