A vibratory measuring device for determining a mass flow rate or a density of a medium includes: a vibratory measuring tube which is curved when in a rest position; a support body; a first bearing body; a second bearing body; two exciter units and two sensor units; and a circuit. The bearing bodies are connected to the support body such that flexural vibration modes of the measuring tube have vibration nodes on the bearing bodies, wherein the exciter units are configured to excite flexural vibrations of the measuring tube, wherein the sensor units are each configured to detect flexural vibrations of the measuring tube both in and perpendicular to the plane and to output vibration-dependent sensor signals, wherein the circuit is configured to output excitation signals to the excitation units for the selective excitation of flexural vibration modes and to receive the sensor signals of the sensor units.

An apparatus for use with a Coriolis meter is provided. The apparatus includes an array of strain-based sensors, a filtering module, and a processing unit. The sensor array is configured for sensing a meter flow tube. The array is configured for mounting on the flow tube. The sensors are configured to produce sensor signals representative of strain within the flow tube. The processing unit controls the sensor array to produce the sensor signals representative of the strain within the flow tube. The strain includes a first portion associated with the flow tube vibrating at a resonant frequency of the flow tube and a second portion associated with a fluid flow passing through the flow tube. The filtering module filters the sensor signals to remove a sensor signal portion representative of the strain associated with the flow tube vibrating at the resonant frequency of the flow tube.

A system for tracking selected wave parameters from a received sinusoidal wave with noise and methods for making and using the same. The method includes performing a multi-track double integral analysis of the sinusoidal wave with noise and creating time dependent outputs. These time dependent outputs may be analyzed mathematically to determine the amplitude, frequency and/or phase of the wave with reduced noise. In one embodiment, the method may employ multiple passes through double integral analysis. The method advantageously can measure output sinusoidal wave parameters with reduced noise, measurements that are close to theoretical noise reduction limits.

A method includes registering a first mass flow rate portion measurement value ṁ.sub.1 of a first flow portion through measuring tubes of a first oscillator and a second mass flow rate portion measurement value ṁ.sub.2 of a second flow portion through measuring tubes of the second oscillator. A sum of the two mass flow rate portion measurement values gives a mass flow rate total measurement value. The method also includes registering first and second density portion measurement values ρ.sub.1, ρ.sub.2 of the medium in the flow portions and calculating the effective density measurement value ρ.sub.eff as a function of the density portion measurement values ρ.sub.1, ρ.sub.2 with weightings dependent on the mass flow rate portion measurement values ṁ.sub.1, ṁ.sub.2. The different weighting functions are applied for ascertaining the weightings as a function of the mass flow rate portion measurement values.

A vibratory meter (5, 1600) configured to predict and reduce noise in the vibratory meter (5, 1600). The vibratory meter (5, 1600) includes a sensor assembly (10, 1610) and a meter electronics (20, 1620) in communication with the sensor assembly (10, 1610). The meter electronics (20, 1620) is configured to provide a drive signal to a sensor assembly (10, 1610), receive a sensor signal from the sensor assembly (10, 1610) having one or more components, and generate a signal to be applied to one of the sensor signal and the drive signal to compensate for the one or more components.

In accordance with example embodiments of the present disclosure, a method for determining parameters for, and application of, models that correct for the effects of fluid inhomogeneity and compressibility on the ability of Coriolis meters to accurately measure the mass flow and/or density of a process fluid on a continuous basis is disclosed. Example embodiments mitigate the effect of multiphase fluid conditions on a Coriolis meter.

The invention relates to a Coriolis measuring sensor for detecting a mass flow rate or a density of a medium flowing through a measurement tube of the Coriolis measuring instrument. The measurement tube has an inlet and an outlet designed to convey the medium between the inlet and the outlet; an exciter; and two sensors; the measuring sensor comprising a supporting element having a chamber designed to house the measurement tube at least in portions. The magnet device comprises a magnetically conductive holder for magnets and a first pair of magnets arranged on the holder on a first face of the coil device, with the magnets designed to cause a magnetic field perpendicularly to a cross-sectional plane of the coil, and the magnetic field of a first magnet of the pair is oriented so as to be opposite to the magnetic field of a second magnet of the pair.

The measuring system comprises a vibration-type transducer (10) and electrically coupled measuring system electronics unit (20) for controlling the transducer and evaluating vibration measurement signals provided by the transducer. The exciter arrangement has a vibration exciter (31) which is positioned and aligned such that a drive offset (ΔE) is no more than 0.5% of the tube length. The measuring system electronics (20) are configured to supply electrical power to the vibration exciter (31) by means of an electrical drive signal (e1) having a temporally-variable electrical current and to provide the drive signal (e1) at least intermittently with a sinusoidal (second useful) current (eN2) having a (second) (AC) frequency, in order to monitor a quality of the measured substance based upon a corresponding (second) useful signal component (s1N2; s2N2) of at least one of the vibration measurement signals (s1, s2).

A method (300), system (400), and electronics (20) for correcting a mass flow value in measured using a Coriolis flow meter (100) for temperature effects at a known fluid temperature temp below 0 C are provided. The method comprises receiving a known fluid density ρ.sub.indic, receiving the fluid temperature temp, receiving a time period Tp, determining a Young's modulus temperature correction for density TFy.sub.D based on the known fluid density ρ.sub.indic, the known fluid temperature temp, and the time period Tp, determining a Young's modulus temperature correction for mass flow TFy.sub.M based on a temperature correction constant k and Young's modulus temperature correction for density TFy.sub.D, and correcting the mass flow value {dot over (m)} using the Young's modulus temperature correction for mass flow TFy.sub.M.

A measuring system includes a vibration-type transducer including a tube and measuring system electronics electrically coupled to a vibration exciter and a sensor assembly, wherein at a drive point, the vibration exciter is positioned such that a drive offset is no more than 3 mm and/or less than 0.5% of the tube length, and wherein a vibration node of a second or higher order, lies within the reference cross-sectional area, and wherein the measuring system electronics is configured to both provide a drive signal with a sinusoidal current having a frequency such that the frequency deviates from a resonant frequency of a vibration mode of a second order naturally intrinsic to the tube by less than 1% of the resonant frequency and/or by less than 1 Hz, and to perform a self-diagnosis of the measuring system based on a corresponding signal component of at least one vibration measurement signal.