Disclosed is a method for determining the viscosity of a medium using a Coriolis mass flow meter, comprising: exciting bending vibrations in the measuring tube in a symmetrical bending vibration use mode using an exciter arranged symmetrically in relation to a longitudinal direction of the measuring tube; detecting sensor signals of a central vibration sensor also arranged symmetrically in relation to a longitudinal direction of the measuring tube; detecting sensor signals of a vibration sensor on the inlet side and of a vibration sensor on the outlet side; determining a phase relation or time delay between the sensor signals of the central vibration sensor and a symmetrical function of the sensor signals on the inlet-side and outlet-side vibration sensors. Determining the viscosity of the medium as a function of said phase relation or time delay.

The invention relates to a Coriolis measuring transducer (10), comprising:

at least one measuring tube;

at least one exciter mechanism (12.1);

at least two sensor groups of sensor arrangements with, in each case, at least one sensor arrangement,

wherein the at least one measuring tube is at least sectionally bent,

wherein the measuring tube is clamped in the regions of the inlet and the outlet by, in each case, a securement apparatus,

wherein the measuring tube has an inner side (IS) facing a longitudinal axis as well as an outer side (OS) facing away from the longitudinal axis,

wherein the exciter mechanism is arranged in a midlength region of the measuring tube, wherein a first sensor group is arranged in an inlet side intermediate region of the measuring tube, and wherein a second sensor group is arranged in an outlet side intermediate region of the measuring tube,

wherein at least one sensor group (13) is a supplemented sensor group (13.1) and includes at least two sensor arrangements (13.2).

A Coriolis measuring device for measuring volume flow or density of a medium flowing through a measuring tube is disclosed, the device comprising: the measuring tube for conveying the medium; at least one exciter, which is adapted to excite the measuring tube to execute oscillations; at least one sensor, which is adapted to register the oscillations of the measuring tube; an electronic measuring/operating circuit, which is adapted to operate the exciter as well as the sensor and to determine and to output flow and/or density measurement values; wherein the electronic measuring/operating circuit has an electronics board, wherein at least one exciter has a stationary exciter element, and/or wherein at least one sensor has a stationary sensor element, wherein at least one stationary exciter element and/or at least one stationary sensor element is integrated into the electronics board.

Provided is a Coriolis flow sensor assembly that includes a fluid flow assembly, including a flow tube, wherein the fluid flow assembly is configured to provide a flow path through the flow tube. The flow tube has at least one region of increased stiffness, which may be a result of a structural support component coupled to the flow tube. In another embodiment, the increased stiffness is caused by integral properties of the flow tube.

A vibratory measuring device for determining a mass flow rate or a density of a flowable medium comprises: a vibratory measuring tube which is curved when in the idle position thereof; a support body; a first bearing body on the inlet side; a second bearing body on the outlet side; two exciter units and two sensor units; and an operation and evaluation circuit. The bearing bodies are connected to the support body, wherein the measuring tube is supported on the bearing bodies in such a way that flexural vibration modes of the measuring tube have vibration nodes on the bearing bodies, wherein the exciter units are each configured, according to excitation signals, to excite flexural vibrations of the measuring tube both in the measuring tube plane and perpendicular to the measuring tube plane, wherein the sensor units are each configured to detect flexural vibrations of the measuring tube both in the measuring tube plane and perpendicular to the measuring tube plane and to output vibration-dependent sensor signals, wherein the operation and evaluation 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.

A mass flow sensor includes: a vibratory measurement tube bent in a tube plane; a vibration exciter for exciting bending vibrations in a bending vibration use-mode; two vibration sensors for sensing vibrations; a support system having a support plate, bearing bodies on the inlet and sides; and a sensor housing, wherein: the support system has support system vibration modes which include elastic deformations of the support plate; the measurement tube is connected fixedly to the support plate by the bearing body on the inlet side and by the bearing body on the outlet side; and the support plate has a number of spring-loaded bearings exposed through cut-outs in the support plate by which the support plate is mounted on the sensor housing with degrees of vibrational freedom, the natural frequencies of which are lower than a use-mode natural frequency of the bending vibration use-mode.

A downhole tool includes a membrane to separate water from a formation fluid and a meter that operates as a densitometer and a Coriolis effect flowmeter.

A mass flow measuring sensor includes: an oscillatable measuring tube bent in a tube plane; an oscillation exciter for exciting bending oscillations in a bending oscillation use-mode; two oscillation sensors for registering oscillations; a support system; and a measuring sensor housing; wherein the support system has support system oscillation modes, including elastic deformations of the support plate; wherein the support plate is cut to form a number of spirally shaped spring securements, via which the support plate is secured to the measuring sensor housing with oscillation degrees of freedom, whose eigenfrequencies are lower than a use-mode eigenfrequency of the bending oscillation use-mode, wherein the use-mode eigenfrequency is lower than the eigenfrequencies of the support system oscillation modes, wherein a calibration factor describes a proportionality between a mass flow through the measuring tube and a phase difference between oscillations of the measuring tube oscillating in the bending oscillation use-mode.

A meter electronics (20) having a notch filter (26) configured to filter a sensor signal from a sensor assembly (10) in a vibratory meter (5) is provided. The meter electronics (20) includes the notch filter (26) communicatively coupled to the sensor assembly (10). The meter electronics (20) is configured to receive the sensor signal from the sensor assembly (10), the sensor signal being comprised of a first component at a resonant frequency of the sensor assembly (10) 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.

A method for operating a vibratory flowmeter (5) is provided. The method includes placing a process fluid in the vibratory meter (5) and measuring entrained gas in the process fluid. A measurement confidence level is determined for at least one operating variable.