Micromotion Gmbh

Timothy J Cunningham

Matthew Joseph Rensing

Andrew Timothy Patten

Stuart James Shelley

Christopher George Larsen

Mark James Bell

David J Kapolnek

Thomas Dean Sharp

David Lee Campbell

Craig B McAnally

William M Mansfield

David Frederick Normen

Dean M Standiford

Donald Reed Cage

Gary Edward Pawlas

James R Ruesch

Miles Keeney-Ritchie

Anand Vidhate

Manoj Rao

Charles L Gray

Craig B Mcanally

A vibratory flowmeter () for meter verification is provided, including meter electronics () coupled to the first and second pickoff sensors (L,R) and coupled to a driver (), with the meter electronics () configured to: vibrate the flowmeter assembly () in a single mode using the driver (), determine a single mode current () of the driver () and determine first and second response voltages () generated by the first and second pickoff sensors (L,R), respectively, compute frequency response functions for the determined first and second response voltages () from the determined single mode current (), fit the generated frequency response functions to a pole-residue model, and verify proper operation of the vibratory flowmeter () using the meter stiffness value (), residual flexibility (), and the meter mass () in embodiments.

Vibratory flowmeter and methods and diagnostics for meter verification

A method for detecting a deviation in a flow meter parameter is provided. The method includes measuring a flow tube temperature in a plurality of locations; and calculating a temperature gradient based on the measured temperatures. The method also includes detecting a deviation in the flow meter parameter if the calculated temperature gradient exceeds a temperature gradient threshold.

Method for generating a diagnostic from a deviation of a flow meter parameter

A meter electronics () and a method for detecting and identifying a change in a vibratory meter () is provided. The meter electronics () includes an interface () configured to receive sensor signals () from a meter assembly () and provide information based on the sensor signals () and a processing system () communicatively coupled to the interface (). The processing system () is configured to use the information to determine a first stiffness change () associated with a first location of a conduit (') of the vibratory meter (), determine a second stiffness change () associated with a second location of the conduit (&#x2032;) of the vibratory meter (), and determine a condition of the conduit (&#x2032;) based on the first stiffness change and the second stiffness change.

Detecting and identifying a change in a vibratory meter condition based on stiffness change determination at two locations on the conduit

A system (800) for minimizing a crest in a multi-tone drive signal in a vibratory meter (5) is provided. The system (800) includes a drive signal generator (810) configured to generate the multi-tone drive signal for the vibratory meter (5) and a drive signal detector (820). The drive signal detector (820) is configured to receive the multi-tone drive signal, determine a first maximum amplitude of the multi-tone drive signal having a component at a first phase, determine a second maximum amplitude of the multi-tone drive signal having the component at a second phase, and compare the first maximum amplitude and the second maximum amplitude.

Minimizing a crest in a multi-tone drive signal in a vibratory meter

A method for detecting a deviation in a flow meter parameter is provided. The method includes measuring a differential pressure across at least a portion of the flow meter, calculating a friction factor based on a measured flow rate and the measured differential pressure. The method also includes comparing the calculated friction factor to an expected friction factor based on the measured flow rate and detecting a deviation in the flow meter parameter if the difference between the calculated friction factor and the expected friction factor exceeds a threshold limit.

A meter electronics () having a notch filter () configured to filter a sensor signal from a sensor assembly () in a vibratory meter () is provided. The meter electronics () includes the notch filter () communicatively coupled to the sensor assembly (). The meter electronics () is configured to receive the sensor signal from the sensor assembly (), the sensor signal being comprised of a first component at a resonant frequency of the sensor assembly () and a second component at a non-resonant frequency and pass the first component and substantially attenuate the second component with the notch filter, wherein the first component is passed with substantially zero phase shift.

Notch filter in a vibratory flow meter

A system () for determining frequency spacings to prevent intermodulation distortion signal interference is provided. The system () includes a sensor assembly () and a meter verification module () communicatively coupled to the sensor assembly (). The meter verification module () is configured to determine a frequency of a first signal to be applied to a sensor assembly () of a vibratory meter and set a demodulation window about the frequency of the first signal. The meter verification module () is also configured to determine a frequency of the second signal to be applied to the sensor assembly such that a frequency of an intermodulation distortion signal generated by the first signal and the second signal is outside the demodulation window.

Frequency spacings to prevent intermodulation distortion signal interference

A system () and method () for a standards traceable verification of a vibratory meter () is provided. The system () includes a storage () having a baseline meter verification value of the vibratory meter and a processing system () in communication with the storage (). The processing system () being configured to obtain the baseline meter verification value from the storage () and determine a relationship between the baseline meter verification value and a calibration value of the vibratory meter, said calibration value being traceable to a measurement standard. The method () provides a traceable verification of a vibratory meter by comparing () a physical property of the vibratory meter, which is determined from a first calibration value, to a reference value determined from a second calibration value, said calibration values being traceable to a measurement standard.

Standards traceable verification of a vibratory meter

A vibratory flowmeter () for meter verification is provided, including meter electronics () configured to vibrate the flowmeter assembly () in a primary vibration mode using the first and second drivers (L,R), determine first and second primary mode currents () of the first and second drivers (L,R) for the primary vibration mode and determining first and second primary mode response voltages () generated by the first and second pickoff sensors (L,R) for the primary vibration mode, generate a meter stiffness value () using the first and second primary mode currents () and the first and second primary mode response voltages (), and verify proper operation of the vibratory flowmeter () using the meter stiffness value ().

Vibratory flowmeter and method for meter verification

A method and apparatus for a flowmeter () is provided. The method comprises the steps of placing a material in a flow tube (') while exciting a vibration mode of the flow tube (&#x2032;). Exciting the vibration mode of the flow tube (&#x2032;) comprises the steps of periodically driving a first driver (L) with a first signal and periodically driving a second driver (R) with a second signal, wherein the second driver (R) is driven essentially in phase with the first driver (L), but wherein the first driver's (L) drive amplitude modulated signal reaches a maximum amplitude when the second driver's (R) drive modulated signal reaches a minimal amplitude, and the first driver's (L) drive amplitude modulated signal reaches a minimum amplitude when the second driver's (R) drive amplitude modulated signal reaches a maximum amplitude. The method also comprises the steps of measuring the relative phase between a first pickoff (L) and a second pickoff (R) and determining a relative phase of a right eigenvector for the flow tube (&#x2032;).

Method of determining the left eigenvectors in a flowing Coriolis flowmeter

A meter verification method for a vibratory flowmeter () is provided, comprising vibrating a sensor assembly () of the vibratory flowmeter () with a plurality of test tones in a vibration mode using a driver (), wherein the plurality of test tones is applied substantially instantly, in the absence of a ramp function. A driver () current is determined, and response voltage of pickoff sensors (L,R) are determined for the vibration mode. The instantaneous frequency of the pickoff sensor (L,R) signals is measured, and a filter is applied to isolate the response at each of the plurality of test tones. The filter is also applied to the instantaneous frequency measurements. The same delay is applied to the frequency measurements and the response at each of the test tones. A meter stiffness value () is generated using the current () and the response voltage (), and proper operation of the vibratory flowmeter () is verified using the meter stiffness value ().

Vibratory flowmeter test tones without ramp time

A method for detecting a deviation in a flow meter parameter of a flow meter that is adapted to measure a fluid flow rate is provided. The method comprises measuring a differential pressure across at least a portion of the flow meter. The method further comprises comparing the measured differential pressure to an expected differential pressure; the expected differential pressure being based on the measured flow rate. The method further comprises detecting a deviation in the flow meter parameter if the difference between the measured differential pressure and the expected differential pressure exceeds a threshold limit.

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Boulder, CO, United States of America

Timothy J Cunningham