Endress + Hauser Flowtec Ag

Jerry E Stevens

Paul Logue

Hao Zhu

Marcel Braun

Kyle Shipps

A calibration system and methods for flow metering technologies integrates a known primary reference standard (e.g., a gravimetric scale), configured to determine a mass of calibration fluid, in parallel with surrogate secondary masters (e.g., Coriolis effect flowmeters) connected via an adjustable flowpath having a closed loop mode, including a meter bank, a pump and a measuring section, and an open loop mode, including a reservoir, the meter bank, the pump, the measuring section and the primary reference standard, which enables calibration duality and redundant meter under test confirmation of calibration factors. The disclosed systems and methods enable life cycle assurance of the primary reference standard and the secondary masters' standard reliability and reproducibility over time and, as a redundant system, enable calibration of multiple flow metering technologies, such as, for example, volumetric, mass, density, viscosity and Reynolds number-reliant technologies, in one homogenous system.

Flowmeter calibration system and method

A method for testing a device under test, the device under test being a measuring instrument to measure a physical parameter of a fluid, includes: performing a plurality of valid test runs, wherein a valid test run includes: exposing the device under test and a reference measuring instrument to the fluid under a set of influences, the set of influences being defined by influence parameters; monitoring the influence parameters; obtaining a reference value for the physical parameter from the reference measuring instrument; and obtaining a test value for the physical parameter from the device under test, wherein a test run is invalidated if influence parameters do not meet specified test requirements for the influence parameters; and then evaluating a plurality of test values originating from the plurality of valid test runs with respect to at least one of accuracy, repeatability and reproducibility.

Method for testing a device under test

A Coriolis flowmeter having an improved measurement accuracy, especially in measurement applications, where conventional Coriolis flowmeter may have a reduced accuracy due to erroneous flow spiking or outputs during no-flow situations is described, comprising: a measurement tube (), a driver () for imparting a force proportional to an applied excitation signal to the measurement tube () for setting the measurement tube () into an oscillatory motion, motion sensors () for measuring the motion of the measurement tube (), an excitation signal generator, for generating the excitation signal to be supplied to the driver () based on the measurement signals derived by the motion sensors (), means () for monitoring the excitation signal or a damping-coefficient of a damping of the measurement tube () and for determining whether an amplitude (A) of the excitation signal or the damping coefficient exceeds an application-specific range, and means for determining a corrected flow (F) of a fluid through the measurement tube (), wherein the corrected flow (F) is determined based on measurement signals derived by the motion sensors (), when the excitation signal or the damping coefficient has an amplitude, that lies within the application-specific range and wherein the corrected flow (F) is set to an application-specific flow, when the excitation signal or the damping coefficient has an amplitude, that exceeds the application-specific range.

Coriolis flowmeter

A Coriolis flowmeter having an improved measurement accuracy, especially in measurement applications, where conventional Coriolis flowmeters may have a reduced accuracy due to erroneous flow spiking or outputs during no-flow situations is described, comprising: a measurement tube, a driver for imparting a force proportional to an applied excitation signal to the measurement tube for setting the measurement tube into an oscillatory motion, motion sensors for measuring the motion of the measurement tube, an excitation signal generator, for generating the excitation signal to be supplied to the driver based on the measurement signals derived by the motion sensors, means for monitoring the excitation signal or a damping-coefficient of a damping of the measurement tube and for determining whether an amplitude (A) of the excitation signal or the damping coefficient exceeds an application-specific range, and means for determining a corrected flow (F) of a fluid through the measurement tube, wherein the corrected flow (F) is determined based on measurement signals derived by the motion sensors, when the excitation signal or the damping coefficient has an amplitude, that lies within the application-specific range and wherein the corrected flow (F) is set to an application-specific flow, when the excitation signal or the damping coefficient has an amplitude, that exceeds the application-specific range.

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Brownsburg, IN, United States of America

Jerry E Stevens