A measuring system comprises: a measuring transducer; transmitter electronics; at least one measuring tube; and at least one oscillation exciter. The transmitter electronics delivers a driver signal for the at least one oscillation exciter, and for feeding electrical, excitation power into the at least one oscillation exciter. The driver signal, has a sinusoidal signal component which corresponds to an instantaneous eigenfrequency, and in which the at least one measuring tube can execute, or executes, eigenoscillations about a resting position. The eigenoscillations have an oscillation node and in the region of the wanted, oscillatory length exactly one oscillatory antinode. The driver signal has, a sinusoidal signal component with a signal frequency, which deviates from each instantaneous eigenfrequency of each natural mode of oscillation of the at least one measuring tube, in each case, by more than 1 Hz and/or by more than 1% of said eigenfrequency.

The invention relates to a Coriolis measuring transducer (10) of a Coriolis measuring device (1) as well as to the Coriolis measuring device for registering a mass flow or a density of a medium flowing through at least one measuring tube of the Coriolis measuring device, comprising:

the at least one measuring tube (11) having an inlet (11.1) and an outlet (11.2) and adapted to convey the medium between the inlet and outlet;
at least one exciter (12), which is adapted to excite the at least one measuring tube to execute oscillations;
at least one sensor (13), which is adapted to register deflection of the oscillations of the at least one measuring tube;
wherein at least one exciter as well as at least one sensor have, in each case, a coil apparatus (14) with, in each case, at least one coil (14.1) as well as, in each case, a magnet apparatus (15), wherein the magnet apparatus and the coil apparatus are movable relative to one another,
characterized in that at least one exciter or at least one sensor has an integrated temperature measuring device (14.3) for measuring temperature of the exciter, or of the sensor, as the case may be.

A method of automatically verifying accurate operation of a flowmeter during field operation is provided that comprises providing a flowmeter having meter electronics with a storage system, and flowing a non-calibration process fluid through the flowmeter. Meter electronics are configured to perform the steps of: detecting a model of the flowmeter as well as retrieving an initial factory calibration factory zero value and a stored zero drift specification from the storage system. A zero value is measured during field operation of the flowmeter and compared with the factory zero value. An error zero value is calculated. Whether the error between the field operation zero value and the factory zero value is within the zero drift specification is determined, and the flowmeter is calibrated if the error is outside the zero drift specification.

A method is disclosed for determining flow measurement values of a Coriolis mass flowmeter in the presence of a two-phase flow of a two-phase medium having a gas phase and the subsequent presence of a single-phase flow of a single-phase medium not having a gas phase. The method includes: detecting a start time of a two-phase measurement interval at an onset of the two-phase flow; detecting an end time of the two-phase measurement interval at an end of the presence of the two-phase flow; determining and at least partially storing two-phase flow measurement values of the two-phase flow; determining at least one state variable of the single-phase medium; determining subsequently corrected two-phase flow measurement values as at least indirect input variables of a correction calculation; and outputting the corrected two-phase flow measurement values as individual values or as part of a cumulative flow measurement value.

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.

A Coriolis sensor includes: a measurement tube having an inlet and an outlet; an exciter; and two sensor elements, wherein the exciter and/or the sensor element respectively have a coil arrangement and a magnet arrangement, wherein the magnet arrangement has a retainer for magnets, at least one first magnet group and at least one second magnet group, wherein the retainer is U-shaped with a first arm, a second arm and a base connecting the arms, wherein the retainer engages around the coil arrangement, wherein the first magnet group is retained on the first side of the coil arrangement by the retainer, and wherein the second magnet group is retained on the second side of the coil arrangement by the retainer, wherein the retainer has a cavity in a region of each of the arms for receiving a magnet group, wherein the retainer is manufactured using a 3D printing process.

The Coriolis mass flowmeter includes a measuring tube, an exciter mechanism, a sensor arrangement, and an electronic transmitter circuit including measuring and control electronics and drive electronics connected to the measuring and control electronics. The drive electronics are adapted, in a first operating mode, to generate an electrical driver signal that supplies electrical power to the exciter mechanism such that the measuring tube executes forced oscillations having an excitation frequency and, in a second operating mode, to cease generating the electrical driver signal. The transmitter circuit is adapted to switch the drive electronics from the first operating mode to the second operating mode such that the measuring tube executes free, damped oscillations in the second operating mode, and the measuring and control electronics are adapted to, based on a phase difference between oscillation measuring signals from the sensor arrangement, to generate measured values representing the mass flow rate.

A measuring device for measuring flow velocity includes a measuring tube, a measuring transducer for registering a measured variable and outputting a first measured value representing the measured variable, a temperature sensor, and an electronic measuring/operating circuit. The temperature sensor has a sensor element and electrically conductive leads. Each lead is connected with the sensor element and has a first section following on the connection location. The sensor element has a maximum periphery. The first section has a separation of less than 5% of a measuring tube radius from a measuring tube wall, wherein a length of each lead in the first section is at least 25% of the maximum periphery. The leads are guided in their first section at least in certain regions along the maximum periphery, and in their first section are in certain regions in thermal contact with the measuring tube.

The present disclosure relates to a Coriolis mass flow meter including two measuring tube pairs each having two measuring tubes mounted as to oscillate relative to one another and have a bending vibration excitation mode of different excitation mode natural frequencies, each pair having an electrodynamic exciter and a vibration sensor pair including a first inlet-side vibration sensor and a first outlet-side vibration sensor, and further includes a circuit configured to determine phase difference-dependent mass flow measurement values, wherein a difference deviation between a first relative signal amplitude difference of sensor signals having the first excitation mode natural frequency and a second relative signal amplitude difference of sensor signals having the second excitation mode natural frequency is not more than a tolerance value.

Vibratory meters (5), and methods for their use measuring a fluid are provided. Each vibratory meter includes a multichannel flow tube (300) comprising two or more fluid channels (302), a pickoff (170), a driver (180), and meter electronics (20) configured to apply a drive signal to the driver at a drive frequency ω, and measure a deflection of the multichannel flow tube with the pickoff. At least one fluid channel has an effective diameter that is related to the length of the flow tube.