Micromotion Gmbh

Bert J Downing

Craig B McAnally

Craig B Mcanally

A meter electronics () for detecting a change in a vibratory meter () based on two or more baseline meter verifications is provided. The meter electronics () comprises 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 (), said processing system () being configured to use the information to determine a first baseline meter verification value at a first set of process conditions, determine a second baseline meter verification value at a second set of process conditions, and determine a baseline meter verification value based on the first baseline meter verification value and the second baseline meter verification value.

Detecting a change in a vibratory meter based on two baseline meter verifications

A meter electronics () for determining a damping of a meter assembly () of a flow meter () is provided. The meter electronics () includes an interface () for receiving a vibrational response from a meter assembly (), the vibrational response comprising a response to an excitation of the meter assembly () at a substantially resonant frequency, and a processing system () in communication with the interface (). The processing system () is configured to receive the vibrational response from the interface () and measure a plurality of response voltages (V) of the vibrational response, the plurality of response voltages (V) including at least one of one or more decay sections (-) and one or more rising sections (-). The processing system () is also configured to determine an aggregate damping-related value of the meter assembly () based on at least one of the one or more decay sections (-) and the one or more rising sections (-).

Determining a damping of a meter assembly

A meter electronics () for determining a decay characteristic of a meter assembly () of a flow meter () is provided. The meter electronics () includes an interface () for receiving a vibrational response from a meter assembly (), the vibrational response comprising a response to an excitation of the meter assembly () at a substantially resonant frequency, and a processing system () in communication with the interface (). The processing system () is configured to receive the vibrational response from the interface (), determine a response voltage (V) of the vibrational response, determine a decay characteristic (ζ) of the meter assembly () based on the response voltage (V), and compensate the decay characteristic (ζ) by using a previously determined decay characteristic-to-response voltage relationship.

Determining a decay characteristic of a meter assembly

A method () for determining when to verify a stiffness coefficient K () in a flowmeter () comprising receiving a first stiffness coefficient K (), a plurality of temperatures T (), a plurality of response frequencies ω (), and a plurality of driver currents I (), determining an average temperature T (), a standard deviation temperature T (), an average response frequency ω (), a standard deviation response frequency ω (), an average driver current I (), and a standard deviation driver current I (). A first subsequent value () comprising a subsequent temperature T (), a subsequent response frequency ω (), or a subsequent driver current I () is received. Upon determining that the first subsequent value () is outside a first respective range (), a determination of a second stiffness coefficient K () is initiated.

Method to determine when to verify a stiffness coefficient of a flowmeter

A method for verifying accurate operation for a flow meter () is provided. The method entails receiving a vibrational response from the flow meter (), wherein the vibrational response comprises a response to a vibration of the flow meter () at a substantially resonant frequency. At least one gain decay variable is measured. It is then determined whether the gain decay variable is outside a predetermined range. A filter used in a stiffness calculation is adjusted if the gain decay variable is outside the predetermined range. The ability to detect and/or quantify any changes to the stiffness of the meter assembly in order to maintain a high level of accuracy is an improvement in the field of flow meters.

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Longmont, CO, United States of America

Bert J Downing