Vibration measurement system

Abstract

The invention relates to a measuring system comprising a measuring transducer having at least one measuring tube, an exciter arrangement, a sensor arrangement and an electronic transformer circuit (US), the electronic transformer circuit has measurement and control electronics (DSV) and drive electronics (Exc) connected to and / or controlled by the measurement and control electronics. The drive electronics for the components thereof are designed to be controlled by the measurement and control electronics in order to generate an electric drive signal (e1) in a first operating mode (I) and thereby feed electric power into the exciter arrangement, in a first operating mode (II), the drive electronics are arranged such that the at least one measuring tube performs a forced mechanical vibration at a vibration frequency predefined by the electric drive signal at least during a first measuring interval, and in a second operating mode (II), the generation of the electric drive signal is suspended such that during said suspension the drive electronics do not feed electric power into the exciter arrangement.

Description

Technical Field

[0001] The invention relates to a vibration measuring system having a vibration type measuring transducer and an electronic transformer circuit connected thereto. Background Art

[0002] In industrial measurement technology, in particular also in connection with the regulation and monitoring of automated process engineering processes, vibration measuring systems formed with the aid of a transformer circuit, which is primarily formed with the aid of at least one microprocessor, and vibration-type measuring transducers, through which the medium to be measured flows during operation, are often used for determining with high precision the mass flow rate (mass flow) of a medium, such as a liquid, a gas or a dispersion, flowing in a process line, such as a pipeline. Examples of such measuring systems are also designed, for example, as Coriolis mass flow rate measuring devices, Coriolis mass flow rate / density measuring devices and / or Coriolis mass flow rate / viscosity measuring devices, which are described in particular in the following patents: EP-A 816 807, US-A 2002 / 0033043, US-A 2006 / 0096390, US-A 2007 / 0062309, US-A 2007 / 0119264, US-A 2008 / 0011101, US-A 2008 / 0047362, US-A 2008 / 0190195, US-A 2008 / 0250871, US-A 2010 / 0005887, US-A 2010 / 0011882, US-A 2010 / 0257943, US-A 2011 / 0161017, US-A 2011 / 0178738, US-A 2011 / 0219872, US-A 2011 / 0265580, US-A 2011 / 0271756, US-A 2012 / 0123705, US-A 2013 / 0042700, US-A 2016 / 0313162, US-A 2017 / 0261474, US-A 2020 / 0408581, US-A 44 91 009, US-A 47 56 198, US-A 47 77 833, US-A 48 01 897, US-A 48 76 898, US-A 49 96 871, US-A 50 09 109, US-A 52 87 754, US-A 52 91 792, US-A 53 49 872, US-A 57 05 754, US-A 57 96 010, US-A 5796 011, US-A 58 04 742, US-A 58 31 178, US-A 59 45 609, US-A 59 65 824, US-A 60 06609, US-A 60 92 429, US-B 62 23 605, US-B 63 11 136.US-B 64 77901, US-B 65 05518, US-B 65 13 393, US-B 66 51 513, US-B 66 66 098, US-B 67 11 958, US-B 68 40109, US-B 69 20 798, US-B 70 17 424, US-B 70 40 181, US-B 70 77 014, US-B 72 00503, US-B 72 16 549, US-B 72 96 484, US-B 73 25 462, US-B 73 60 451, US-B 77 92646, US-B 79 54 388, US-B 83 33 120, US-B 86 95 436, WO-A 00 / 19175, WO-A 00 / 34748, WO-A 01 / 02816, WO-A 01 / 71291, WO-A 02 / 060805, WO-A 2005 / 093381, WO-A 2007 / 043996、WO-A 2008 / 013545、WO-A 2008 / 059262、WO-A 2010 / 099276、WO-A 2013 / 092104、WO-A2014 / 151829、WO-A 2016 / 058745、WO-A 2017 / 069749、WO-A 2017 / 123214、WO-A 2017 / 143579、WO-A 85 / 05677、WO-A 88 / 02853、WO-A 89 / 00679、WO-A 94 / 21999、WO-A 95 / 03528、WO-A 95 / 16897、WO-A 95 / 29385, WO-A 98 / 02725, WO-A 99 / 40 394 or (not previously published) international patent application PCT / EP2021 / 083169.

[0003] The measuring transducer of each measuring system shown therein comprises at least one at least partially straight and / or at least partially curved, for example U-shaped, V-shaped, S-shaped, Z-shaped or Ω-shaped measuring tube having a lumen surrounded by a tube wall for guiding a medium.

[0004] At least one measuring tube of such a measuring transducer is configured to conduct the medium in the tube cavity and to vibrate at the same time, in particular in such a way that it performs useful vibrations, i.e. mechanical vibrations about a stationary position, at a useful frequency which is also determined by the density of the medium and can therefore be used as a measure of the density. In measuring systems of the type under consideration, in particular also including conventional Coriolis mass flow rate measuring devices, bending vibrations at a natural resonant frequency are usually used as useful vibrations, for example bending vibrations corresponding to a natural bending vibration fundamental mode inherent to the measuring transducer, and wherein the vibrations of the measuring tube are resonant vibrations with exactly one vibration loop. In addition, for measuring tubes that are curved at least in some sections, the useful vibrations are usually designed such that the measuring tube oscillates in the manner of a cantilever clamped at one end about an imaginary vibration axis connecting the inlet-side and outlet-side ends of the measuring tube, whereas in the case of measuring transducers with straight measuring tubes, the useful vibrations are mainly bending vibrations in a single imaginary vibration plane. It is also known to occasionally excite at least one measuring tube into forced, permanent, non-resonant vibrations, for example for the purpose of performing a recursive check of the measuring transducer during operation of the measuring system, or in order to allow free damped vibrations of at least one measuring tube and to evaluate said free damped vibrations, for example as described, in particular, in the above-mentioned documents EP-A 816 807, US-A 2011 / 0178738 or US-A 2012 / 0123705, in order to detect any damage to the at least one measuring tube as early as possible, which could lead to an undesirable reduction in the measurement accuracy and / or the operational reliability of the measuring system in question.

[0005] In the case of measuring transducers with two measuring tubes, these are usually integrated into the corresponding process line via an inlet-side distribution device extending between the measuring tube and the inlet-side connecting flange and via an outlet-side distribution device extending between the measuring tube and the outlet-side connecting flange. In the case of measuring transducers with a single measuring tube, this single measuring tube is usually connected to the process line via a connecting tube opening on the inlet side and via a connecting tube opening on the outlet side. In addition, such transducers with a single measuring tube each include at least one single-piece or multi-piece, for example a tubular, box-shaped or plate-shaped counter-oscillator, which is coupled to the measuring tube on the inlet side to form a first coupling zone and which is coupled to the measuring tube on the outlet side to form a second coupling zone and which essentially rests or oscillates relative to the tube in operation. The internal parts of the measuring transducer formed by means of the measuring tube and the counter-oscillator are usually held in a protective measuring transducer housing only by means of two connecting tubes, in particular in a manner that allows the internal parts to vibrate relative to the measuring transducer housing, via which the measuring tube is connected to the process line during operation. In the case of measuring transducers with a single, essentially straight measuring tube, as shown, for example, in US-A 52 91 792, US-A 57 96 010, US-A 59 45609, US-B 70 77 014, US-A 2007 / 0119264, WO-A 01 / 02 816 or also WO-A 99 / 40 394, this single, essentially straight measuring tube and the counter-oscillator are aligned essentially coaxially with one another, which is very common in conventional measuring transducers, since the counter-oscillator is designed as an essentially straight hollow cylinder and is arranged in the measuring transducer such that the measuring tube is at least partially surrounded by the counter-oscillator. Relatively cost-effective steel grades, such as construction steel or processing steel, are often used as material for such counter-oscillators, in particular when titanium, tantalum or zirconium are used for the measuring tube.

[0006] In order to actively excite or maintain vibrations of at least one measuring tube, in particular also the above-mentioned useful vibrations, the vibration-type measuring transducer further has an electromechanical vibration exciter, which during operation acts differently on the at least one measuring tube and on a possibly present counter-oscillator or possibly present other measuring tubes. The vibration exciter, which is electrically connected to the above-mentioned transformer circuit by means of a pair of electrical connecting lines, for example in the form of connecting cables and / or in the form of printed conductors of a flexible printed circuit board, is particularly used when actuated by an electrical drive signal generated by drive electronics arranged in the transformer circuit and is correspondingly adjusted, in particular at least suitable for changing the vibration properties of the at least one measuring tube in order to convert the electrical excitation power fed by means of the drive signal into a drive force acting on the at least one measuring tube at the action point formed by the vibration exciter. The drive electronics is also specifically configured to adjust the driver signal by means of an internal control so that it has a signal frequency that corresponds to the useful frequency to be induced and that occasionally also changes over time. The driver signal can also be switched off occasionally, for example during operation of a particular measuring system, for example for the purpose of achieving the aforementioned free damped vibrations of at least one measuring tube, or, for example as proposed in the aforementioned document WO-A 2017 / 143579, in order to protect the drive electronics from overload.

[0007] The vibration exciter of a commercially available vibration-type measuring transducer or a vibration measuring system of the type in question is usually constructed in the manner of an oscillating coil operating according to the electrodynamic principle, i.e. by means of a coil - in the case of a measuring transducer, which has a measuring tube coupled thereto and a counter-oscillator, the coil usually being fixed to the latter - and a permanent magnet interacting with at least one coil and acting as an armature, the armature being correspondingly fixed to the measuring tube to be moved. The permanent magnet and the coil are usually aligned in such a way that they extend substantially coaxially with respect to one another. In addition, in conventional measuring transducers, the vibration exciter is usually designed and positioned such that it acts substantially centrally on at least one measuring tube. As an alternative to a vibration exciter which is fairly central and acts directly on the measuring tube, two vibration exciters which are fixed on the inlet or outlet side of at least one vibration element instead of in the center of the at least one vibration element can, for example, also be used for active excitation of mechanical vibrations of at least one measuring tube, in particular as described in the aforementioned document US Pat. No. 6,092,429, or as proposed in particular in US Pat. No. 6,236,05 or US Pat. No. 5,531,126. It is also possible, for example, to use an exciter assembly formed by means of a vibration exciter which acts between an anti-oscillator which may be present and the transducer housing.

[0008] Due to the useful vibrations of the at least one measuring tube, in particular also in the case where the useful vibrations of the at least one measuring tube are bending vibrations, Coriolis forces are induced which are known to also depend on the instantaneous mass flow rate in the flowing medium. These forces can in turn cause Coriolis vibrations with a useful frequency which depends on the mass flow rate and are superimposed on the useful vibrations in such a way that a propagation time difference or phase difference which also depends on the mass flow rate between the inlet-side and outlet-side vibration movements of the at least one measuring tube which performs the useful vibrations and through which the fluid flows at the same time can be detected, i.e. can also be used as a measure for the mass flow rate measurement. With a measuring tube which is curved at least in some sections, wherein a vibration shape which allows the measuring tube to oscillate in the manner of a cantilever clamped at one end is selected for the useful vibrations, the generated Coriolis vibrations correspond, for example, to a bending vibration mode, sometimes also referred to as a torsional mode, in which the measuring tube performs a rotational vibration about an imaginary rotational vibration axis oriented perpendicularly to the mentioned imaginary vibration axis, whereas with a straight measuring tube, whose useful vibrations are designed as bending vibrations in a single imaginary vibration plane, the Coriolis vibrations are, for example, bending vibrations which are substantially coplanar with the useful vibrations.

[0009] In order to detect both inlet-side and outlet-side vibration movements of at least one measuring tube, in particular also those corresponding to useful vibrations, and to generate at least two electrical vibration measurement signals influenced by the mass flow rate to be measured, a measuring transducer of the type in question also has two or more vibration sensors which are spaced apart from one another along the measuring tube and are each electrically connected to the aforementioned transformer circuit, for example by means of a separate pair of electrical connecting lines. Each vibration sensor is configured to convert the aforementioned vibration movements into a vibration measurement signal representing them, which contains a useful signal component, i.e. a (spectral) signal component having a signal frequency corresponding to the useful frequency, and to make said vibration measurement signal available to the transformer circuit, for example, for the measurement and control electronics of the transformer circuit formed by at least one microprocessor, for further processing, which may also be digital. In addition, the at least two vibration sensors are designed and arranged so that the vibration measurement signals generated thereby not only each have a useful signal component, as already mentioned, but also a propagation time or phase difference depending on the mass flow rate can be measured between the useful signal components of the two vibration measurement signals. Based on said phase difference, the transformer circuit or its measurement and control electronics recursively ascertains a mass flow rate measurement value representing the mass flow rate. In addition to measuring the mass flow rate, the density and / or viscosity of the medium can also be measured, for example based on the useful frequency and / or based on the electrical excitation power required to excite or maintain useful vibrations or based on the damping of useful vibrations determined therefrom, and output by the transformer circuit together with the measured mass flow rate in the form of a qualified measured value.

[0010] Studies of conventional vibration measuring systems, in particular those designed as Coriolis mass flow meters, have shown that despite a constant mass flow rate, significant phase errors can occasionally be observed between the above-mentioned useful signal components of the two vibration measurement signals, for example in such a way that time variations in the phase difference which are no longer negligible can be observed, or that the phase difference established between the useful signal components occasionally exhibits an interfering component of variability which is independent of the mass flow rate but which is nevertheless not negligible; this is the case, for example, in applications with media with a density and / or viscosity which changes rapidly over time, in applications with inhomogeneous media, i.e. media with two or more different phases, in applications with media which are allowed to flow over time or in cycles, or in applications with occasional medium changes during the measurement, for example in filling systems or in refueling equipment.

[0011] As also discussed in the aforementioned US-A 2020 / 0408581, WO-A 2017 / 069749 or US-B 79 54 388, the aforementioned phase error can be caused, for example, by electromagnetic coupling of vibration signals and driver signals (crosstalk), for example within a transformer circuit and / or within a measuring transducer. In addition, however, such a phase error can also be attributed to the fact that the useful vibrations actively excited by means of the vibration exciter are damped asymmetrically with respect to the imaginary line of action of the driving force driving the useful vibrations, so that the excited useful vibrations - in particular in the case of a measuring transducer with a single vibration exciter acting centrally on at least one measuring tube - have interference components comparable to Coriolis vibrations.

[0012] In order to reduce or eliminate the phase error caused by electromagnetic coupling, the drive electronics of the measuring system shown in US-A 2020 / 0408581 are also configured to be operated, controlled, in particular by the measuring and control electronics, optionally in a first operating mode, which first operating mode causes the aforementioned active excitation of the useful vibration by means of the electric driver signal, and then temporarily in a second operating mode without supplying the electric driver signal, so that at least one measuring tube (wherein the drive electronics are operated in the first operating mode) performs forced vibration at least during the first measuring interval, and (wherein the drive electronics are operated in the second operating mode) performs free damped vibration at least during the second measuring interval. In addition, the measuring and control electronics of the measuring system shown in US-A 2020 / 0408581 are configured to determine the mass flow rate measurement value based on the first vibration measurement signal and the second vibration measurement signal received at least during the second measuring interval and not (or no longer) containing the aforementioned interference component or their respective phase differences that do not (or no longer) contain the phase error.

[0013] One disadvantage of such determination of mass flow rate measurement values ​​is, inter alia, that the phase angle or phase difference required for the determination of the mass flow rate measurement value must be determined based on the vibration signal of the damped free vibration, which is in fact not very suitable in terms of its signal-to-noise ratio (SN). Summary of the invention

[0014] Based on the aforementioned prior art, it is an object of the present invention to improve a vibration measuring system of the aforementioned type such that a time-varying phase error during operation can be at least approximately, in particular quantitatively and / or correspondingly taken into account when determining a mass flow rate measurement value.

[0015] To achieve this object, the present invention includes a vibration measurement system, such as a Coriolis mass flow meter, comprising:

[0016] a measuring transducer having at least one measuring tube, having an exciter device and having a sensor device;

[0017] and an electronic transformer circuit electrically coupled to both the actuator device and the sensor device, which electronic transformer circuit is formed and / or is programmable by means of at least one microprocessor, has measuring and control electronics and has drive electronics connected to the measuring and control electronics, e.g. electrically connected and / or controlled by the measuring and control electronics;

[0018] wherein the measuring tube is configured to conduct a fluid measured substance, such as a gas, a liquid or a dispersion, which flows at least intermittently and during which it is vibrated;

[0019] wherein the exciter device is configured to convert the electrical power fed to the exciter device into mechanical power which causes forced mechanical vibration of the at least one measuring tube;

[0020] wherein the sensor device is configured to detect mechanical vibrations of the at least one measuring tube and is configured to provide a first vibration measurement signal at least partially representing the vibration movement of the at least one measuring tube and at least one second vibration measurement signal at least partially representing the vibration movement of the at least one measuring tube, for example, such that the first vibration measurement signal and the second vibration measurement signal follow changes in the mass flow rate of the measurement substance guided in the measuring tube with a change in the phase difference, i.e. a change in the difference between the phase angle of the first vibration measurement signal and the phase angle of the second vibration measurement signal;

[0021] wherein the drive electronics is configured to generate an electrical driver signal in a first operating mode and thereby feed electrical power into the exciter device such that the at least one measuring tube executes a forced mechanical vibration having at least one useful frequency, i.e. a vibration frequency predetermined by the electrical driver signal, corresponding, for example, to a resonance frequency of the measuring transducer, and the first vibration measurement signal has a first phase angle and the second vibration measurement signal has a second phase angle,

[0022] and wherein the drive electronics are configured to suspend the generation of the electric driver signal in the second operating mode such that no electrical power is fed into the actuator arrangement by the drive electronics during this time;

[0023] wherein the measuring and control electronics are configured to control the drive electronics such that the drive electronics are initially operated in a first operating mode, for example temporarily and / or up to a value exceeding the inverse of the useful frequency and / or lasting for more than 10 ms in each case, and the at least one measuring tube (in the case of the drive electronics operating in the first operating mode) performs a forced vibration at least during a first measuring interval corresponding to, for example, a value exceeding the inverse of the useful frequency and / or lasting for more than 10 ms, and the drive electronics subsequently switch from the first operating mode to the second operating mode (or vice versa) or operate alternately in the first operating mode or the second operating mode, whereby the at least one measuring tube (in the case of the drive electronics operating in the second operating mode) performs a free damped vibration at least during a second measuring interval corresponding to, for example, a value exceeding the inverse of the useful frequency and / or lasting for more than 10 ms and / or less than 1 s, and the first vibration measurement signal has a third phase angle and the second vibration measurement signal has a fourth phase angle;

[0024] and wherein the measuring and control electronics is configured to receive and evaluate the first vibration measurement signal and the second vibration measurement signal, i.e., is configured to determine one or more, e.g. digital, mass flow rate measurement values, i.e., the mass flow rate (of the medium guided in the at least one measuring tube), based on at least the first vibration measurement signal and the second vibration measurement signal received during one or more first measurement intervals, and also to determine one or more, e.g. digital, phase error measurement values, one or more first phase angles (of the first vibration measurement signal received during one or more first measurement intervals) and one or more second phase angles (of the first vibration measurement signal received during one or more first measurement intervals) and one or more second phase angles (of the first vibration measurement signal received during one or more second measurement intervals) based on the first vibration measurement signal and the second vibration measurement signal received during one or more first measurement intervals, respectively. The invention relates to a method for detecting a first vibration measurement signal received during the first measurement interval and / or a method for detecting a second vibration measurement signal received during the first measurement interval and / or a method for detecting a second vibration measurement signal received during the first measurement interval and / or a method for detecting a second vibration measurement signal received during the second ... second measurement interval and / or a method for detecting a second vibration measurement signal received during the first measurement interval and / or a method for detecting a second vibration measurement signal received during the second measurement interval and / or a method for detecting a second vibration measurement signal received during the second measurement interval and / or a method for detecting a second vibration measurement signal received during the first measurement interval and / or

[0025] Furthermore, the present invention also comprises the use of such a measuring system for measuring and / or monitoring a fluid measuring material, such as a gas, a liquid or a dispersion, which flows at least intermittently in a pipeline and, for example, flows at least intermittently inhomogeneously and / or at least intermittently in 2-phase or multi-phase in the pipeline.

[0026] According to a first embodiment of the measuring system according to the invention, a measuring and control electronic device is further provided, which is configured to determine one or more mass flow rate measurement values ​​using one or more phase error measurement values, for example, such that the measuring and control electronic device is configured to determine at least one correction value using one or more phase error measurement values, the at least one correction value being usable to reduce or compensate for the phase error contained in the first phase difference (of the first vibration measurement signal and the second vibration measurement signal received during one or more first measurement intervals) and is configured to take it into account when determining the mass flow rate measurement value, or to use the at least one correction value to calculate the mass flow rate measurement value.

[0027] According to a second embodiment of the measuring system according to the invention, a measuring and control electronic device is further provided, which is configured to calculate one or more eigenvalues ​​of at least one statistical (measurement system) eigenvalue, such as a position measurement or a dispersion measurement of a set of measurement values ​​including a plurality of phase error measurement values, for example such that the one or more eigenvalues ​​quantify the (central) trend of the phase error measurement values ​​and / or such that the one or more eigenvalues ​​quantify dispersion parameters of the phase error measurement values.

[0028] According to a third embodiment of the measurement system according to the present invention, one or more phase error measurement values ​​are further provided, which represent, e.g. quantify, the (central) trend of the (measured) deviations of one or more first phase angles from one or more second phase angles, such as the mode, median, (empirical) mean of the (measured) deviations.

[0029] According to a fourth embodiment of the measurement system according to the present invention, one or more phase error measurement values ​​are further provided, which represent, for example quantify, the (central) trend of the (measured) deviations of one or more third phase angles from one or more fourth phase angles, such as the mode, median, (empirical) mean of the (measured) deviations.

[0030] According to a fifth embodiment of the measurement system according to the present invention, one or more phase error measurement values ​​are further provided, which represent, e.g. quantify, the (central) trend of the (measured) deviations of one or more first phase differences from one or more second phase differences, e.g. the mode, median, (empirical) mean of the (measured) deviations.

[0031] According to a sixth embodiment of the measurement system according to the invention, one or more phase error measurement values ​​are further provided, which represent, e.g. quantify, a dispersion parameter of the (measured) deviations of one or more first phase angles from one or more second phase angles, such as the (empirical) variance, the (empirical) standard deviation or the range of the (measured) deviations.

[0032] According to a seventh embodiment of the measurement system according to the invention, one or more phase error measurement values ​​are further provided, which represent, e.g. quantify, a dispersion parameter of the (measured) deviations of one or more second phase angles from one or more fourth phase angles, such as the (empirical) variance, the (empirical) standard deviation or the range of the (measured) deviations.

[0033] According to an eighth embodiment of the measurement system according to the present invention, one or more phase error measurement values ​​are further provided, which represent, e.g. quantify, a dispersion parameter of the (measured) deviation of one or more first phase differences from one or more second phase differences, such as the (empirical) variance, the (empirical) standard deviation or the range of the (measured) deviation.

[0034] According to a ninth embodiment of the measuring system according to the invention, a measuring and control electronic device is further provided, which is configured to determine a deviation of one or more phase error measurement values ​​from at least one phase error reference value, which at least one phase error reference value, for example, represents a phase error measurement value determined under reference conditions and / or during a (re)calibration of the measuring system.

[0035] According to a tenth embodiment of the measuring system according to the invention, a measuring and control electronic device is further provided, which is configured to compare one or more phase error measurement values ​​with at least one phase error threshold value - for example, a phase error threshold value that is specific to the measuring system and / or represents a maximum allowed phase error measurement value or a fault in the measuring system and / or the measured material - and is, for example, configured to output an (error) message if one or more phase error measurement values ​​have exceeded at least one phase error threshold value.

[0036] According to an eleventh embodiment of the measuring system according to the invention, there is further provided measuring and control electronics configured to determine one or more mass flow rate measurement values ​​also based on the first vibration measurement signal and the second vibration measurement signal received during one or more second measurement intervals.

[0037] According to a twelfth embodiment of the measuring system according to the invention, there is further provided a measuring and control electronic device which is configured to determine one or more, e.g. digital, (first) phase angle measurement values ​​representing a first phase angle (of the first vibration measurement signal received during the one or more first measurement intervals) based on the first vibration measurement signal received during the one or more first measurement intervals.

[0038] According to a thirteenth embodiment of the measuring system according to the invention, a measuring and control electronic device is further provided, which is configured to determine one or more, e.g. digital, (second) phase angle measurement values ​​representing a second phase angle (of the second vibration measurement signal received during the one or more first measurement intervals) based on the second vibration measurement signal received during the one or more first measurement intervals.

[0039] According to a fourteenth embodiment of the measuring system according to the invention, there is further provided a measuring and control electronic device which is configured to determine one or more, e.g. digital, (third) phase angle measurement values ​​representing a third phase angle (of the first vibration measurement signal received during the one or more second measurement intervals) based on the first vibration measurement signal received during the one or more first measurement intervals.

[0040] According to a fifteenth embodiment of the measuring system according to the invention, there is further provided a measuring and control electronic device which is configured to determine one or more, e.g. digital, (fourth) phase angle measurement values ​​representing a fourth phase angle (of the second vibration measurement signal received during the one or more second measurement intervals) based on the second vibration measurement signal received during the one or more second measurement intervals.

[0041] According to a sixteenth embodiment of the measuring system according to the invention, there is further provided measuring and control electronics which are configured to determine one or more, in particular digital, (first) phase difference measurement values ​​based on the first vibration measurement signal and the second vibration measurement signal received during one or more first measurement intervals , i.e. a measurement representing a (first) phase difference between the first vibration measurement signal and the second vibration measurement signal (received during one or more first measurement intervals). Developing this embodiment of the invention, there is further provided measurement and control electronics configured to determine one or more mass flow rate measurements using the one or more first phase difference measurements.

[0042] According to a seventeenth embodiment of the measuring system according to the invention, there is further provided measuring and control electronics, which are configured to determine one or more, e.g. digital, (second) phase difference measurement values ​​based on the first and second vibration measurement signals received during one or more second measurement intervals, i.e. a measurement value representing a (second) phase difference of the first and second vibration measurement signals (received during one or more second measurement intervals). Developing this embodiment of the invention, there is further provided measuring and control electronics, which are configured to determine one or more mass flow rate measurement values ​​using the one or more second phase difference measurement values.

[0043] According to an eighteenth embodiment of the measuring system according to the invention, it is further provided that the transformer circuit, e.g. the measuring and control electronics thereof, is configured to, e.g. when the drive electronics are operated in the first operating mode or before switching the drive electronics from the first operating mode to the second operating mode, generate a message, e.g. to output the message by means of a control signal and / or to send the message to a display element of the measuring system, which message indicates or causes the mass flow of the measured material conducted in the at least one measuring tube to be set to a constant (mass flow rate) value, in particular a zero (mass flow rate) value.

[0044] According to a nineteenth embodiment of the measuring system according to the invention, it is further provided that a transformer circuit, e.g. its measuring and control electronics, is configured to automatically effect a change (e.g. a plurality of changes) of the drive electronics from a first operating mode to a second operating mode (or vice versa), e.g. in a time-controlled and / or event-controlled manner and / or based on a control signal applied to the transformer circuit, which control signal is triggered, e.g. by a (start) command sent thereby and / or a message transmitted thereby that the mass flow of the measured material conducted in the at least one measuring tube is constant or zero.

[0045] According to a twentieth embodiment of the measuring system according to the invention, a sensor device for detecting mechanical vibrations of at least one measuring tube is further provided, which has a first vibration sensor (51) - for example, electrically and / or on the inlet side - providing a first vibration measurement signal and a second vibration sensor - for example, electrically and / or on the outlet side and / or identical in design to the first vibration sensor - providing a second vibration measurement signal, and for example there are no further vibration sensors besides the first vibration sensor and the second vibration sensor.

[0046] According to a twenty-first embodiment of the measuring system according to the invention, an exciter device is further provided, which has a vibration exciter, for example an electrodynamic and / or a single first vibration exciter, for exciting vibrations of the at least one measuring tube.

[0047] According to a twenty-second embodiment of the measuring system according to the invention, there is further provided drive electronics which are electrically connected to the actuator arrangement.

[0048] According to a twenty-third embodiment of the measuring system according to the invention, there is further provided measuring and control electronics which are electrically coupled to the sensor device.

[0049] According to a twenty-fourth embodiment of the measuring system according to the invention, there is further provided measuring and control electronics having a first analog-to-digital converter for the first vibration measurement signal and a second analog-to-digital converter for the second vibration measurement signal.

[0050] According to a twenty-fifth embodiment of the measuring system according to the invention, the measuring and control electronics are configured to (also) determine phase error measurement values ​​for a situation in which the measuring material flows through the measuring transducer with a mass flow rate different from zero, for example, which mass flow rate is at least approximately constant or stationary for a plurality of consecutive first and second measuring intervals.

[0051] According to a first further development of the measuring system according to the invention, the system further comprises a display element.

[0052] According to a first embodiment of a first further development, a transformer circuit is further provided which is designed to generate a control signal for the display element and to output the control signal to the display element.

[0053] According to a second embodiment of the first further development, a display element is further provided which is designed to receive and process one or more control signals from the transformer circuit, for example to display one or more messages sent by means of the one or more control signals.

[0054] According to a second further development of the measuring system according to the invention, the system further comprises an operating element.

[0055] According to a first embodiment of a second further development, an operating element is further provided, which is configured to convert one or more manual inputs into one or more control signals, for example, the one or more control signals containing one or more (control) commands for the transformer circuit, and send them to the transformer circuit.

[0056] According to a second embodiment of a second further development, a transformer circuit is further provided, which is configured to receive and process one or more control signals from an operating element, for example, the one or more control signals contain one or more (control) commands, for example to execute one or more (control) commands sent by means of the one or more control signals.

[0057] The basic idea of ​​the invention is to occasionally suspend the active excitation of the useful vibrations required for measuring the mass flow rate during the detection of the useful vibrations, i.e. not feed the drive signal into the exciter device, thereby coupling the electrical excitation signal into each of the at least two vibration signals and avoiding an asymmetric drive of the useful vibration as a whole - which is here considered to be the cause of the aforementioned interference components or the cause of the generated phase error, and to determine (during operation of the measuring system) a phase error, i.e. a quantization error, based on both the vibration signal of the actively excited (useful) vibration and the vibration signal of the free (damped) vibration and / or to take the contribution of the phase error into account accordingly when determining the mass flow rate measurement value, in particular to reduce or eliminate it.

[0058] One advantage of the present invention lies in particular in the fact that already established measuring transducer and transformer circuits - for example known from the above-mentioned US-B 63 11 136 or US-A 2020 / 0408581, or also provided by the applicant for Coriolis mass flow meters (http: / / www.endress.com / de / messgeraete-fuer-die-prozesstechnik / produktfinder?filter.business-area=flow&filter.measuring-principle-parameter=coriolis&filter.text=) - can in principle be incorporated, i.e. can also be used with relatively minor modifications to the software or firmware of the relevant transformer circuits, if appropriate, for example by retrofitting already installed measuring systems on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The invention and its advantageous embodiments are explained in more detail below based on the exemplary embodiments shown in the drawings. In all figures, identical or identically acting or identically functioning components are provided with identical reference numerals; for the sake of clarity or if this appears obvious for other reasons, previously mentioned reference numerals are omitted in subsequent figures. Further advantageous embodiments or developments, in particular combinations of partial aspects of the invention initially only explained separately, further emerge from the drawings and / or the claims themselves.

[0060] Specifically, in the figure:

[0061] Figure 1 is a vector diagram of the signal components of a vibration measurement signal generated by a conventional Coriolis mass flowmeter;

[0062] Figure 2 A Coriolis mass flow meter designed here as a compact flow meter is shown;

[0063] Figure 3 Schematically shows a method particularly suitable for Figure 2 A block diagram of a transformer circuit of a Coriolis mass flow meter having a vibration type measuring transducer connected thereto or according to having Figure 2 Coriolis mass flow meter;

[0064] Figure 4 It shows that by using Figure 2 Coriolis mass flow meter or by using Figure 3 A phasor diagram (vector diagram with static vectors) of the signal components of a vibration measurement signal generated by a transformer circuit connected to a vibration type measurement transducer. DETAILED DESCRIPTION

[0065] Figure 2 and Figure 3 A vibration measuring system is shown which can be inserted into a process line (not shown here), such as a pipeline of an industrial plant, for example a filling plant or a refueling plant, for a flowable measuring medium, in particular a fluid or pourable measuring medium, i.e. also a fluid which is at least intermittently 2-phase or multiphase or inhomogeneous. The measuring system is formed, for example, as a Coriolis mass flow meter, in particular for measuring and / or monitoring a mass flow m or for determining a mass flow rate measurement value ( ), mass flow rate measurement value ( ) represents the mass flow rate of the fluid substance to be measured, such as in particular a gas, liquid or dispersion, which flows in the aforementioned process line or at least intermittently therein. In addition, the measuring system can also be used to determine the density of the measured material. According to one embodiment of the invention, there is provided the use of a measuring system for determining mass flow rate measurements of a measured medium to be delivered, i.e., for example, to be delivered in specified or specifiable quantities by a supplier to a customer, for example a liquefied gas, such as a liquid gas containing methane and / or ethane and / or propane and / or butane, or liquefied natural gas (LNG), or also a mixture of substances formed with the aid of liquid hydrocarbons, i.e., for example, oil or liquid fuels. Thus, the measuring system can also be designed, for example, as a component of a delivery point for freight traffic subject to calibration obligations, such as a filling station, and / or as a component of a transfer point in the manner of the delivery points disclosed in the mentioned documents WO-A 02 / 060805, WO-A 2008 / 013545, WO-A 2010 / 099276, WO-A 2014 / 151829 or WO-A 2016 / 058745.

[0066] The measuring system comprises: a physical-electrical measuring transducer MW, which is connected to the process line via an inlet port #111 and an outlet port #112, which are configured to be flowed through by the material to be measured during operation, and an electronic transformer circuit US electrically coupled to it - in particular during operation with the help of internal energy storage and / or supplied with electrical energy from the outside via a connecting cable.

[0067] Advantageously, the transformer circuit US, which is also programmable and / or remotely parameterizable, can also be designed such that it can exchange measurement data and / or other operating data, such as current measured values ​​or setpoint values ​​and / or diagnostic values ​​for controlling the measuring system, with a higher-level electronic data processing system (not shown here), such as a programmable logic controller (PLC), a personal computer and / or a workstation, via a data transmission system, such as a fieldbus system and / or a wireless radio connection, during operation of the measuring system. Thus, the transformer circuit US can have such connection electronics, which are fed, for example, during operation by a (central) evaluation and supply unit provided in the aforementioned data processing system and remote from the measuring system. For example, the transformer circuit US (or its aforementioned connection electronics) can be designed such that it can be electrically connected to an external electronic data processing system via a two-conductor connection 2L, optionally also configured as a 4-20 mA current loop, and via said connection can both obtain the electrical power required for operating the measuring system from the aforementioned evaluation and supply unit of the data processing system and can transmit measured values ​​to the data processing system, for example by (load) modulation of the DC supply current fed by the evaluation and supply unit.

[0068] Additionally, the transformer circuit US can also be designed such that it can nominally operate at a maximum power of 1 W or less and / or is intrinsically safe.

[0069] The measuring transducer MW is a vibrating type measuring transducer, i.e. a measuring transducer having at least one measuring tube 10, having an exciter device 41 and having a sensor device (51, 52), wherein the at least one measuring tube 10 is configured to conduct a fluid measuring material that flows at least intermittently (or through which said material flows) and to vibrate at least intermittently during this process. Figure 3 indicated, or in Figure 2 and Figure 3As can be easily seen in the combined view of FIG. 1 , at least one measuring tube 10 can also be accommodated in the transducer housing 100 together with the exciter device ( 41 ) and the sensor device as well as any other components of the measuring transducer. Thus, the measuring sensor can also be a conventional vibration type measuring sensor, for example, as known from the prior art, in particular from the following aforementioned documents: EP-A 816 807, US-A 2002 / 0033043, US-A 2006 / 0096390, US-A 2007 / 0062309, US-A 2007 / 0119264, US-A 2008 / 0011101, US-A 2008 / 0047362, US-A 2008 / 0190195, US-A 2008 / 0250871, US-A 2010 / 0005887, US-A 2010 / 0011882, US-A 2010 / 0257943, US-A 2011 / 0161017, US-A 2011 / 0178738, US-A 2011 / 0219872, US-A 2011 / 0265580, US-A 2011 / 0271756, US-A 2012 / 0123705, US-A 2013 / 0042700, US-A 2016 / 0313162, US-A 2017 / 0261474, US-A 2020 / 0408581, US-A 44 91 009, US-A 47 56 198, US-A 47 77 833, US-A 48 01 897, US-A 48 76 898、US-A 49 96 871、US-A 50 09 109, US-A52 87 754, US-A 52 91 792, US-A 53 49 872, US-A 57 05 754, US-A 57 96 010, US-A 5796 011, US-A 58 04 742, US-A 58 31 178, US-A 59 45 609, US-A 59 65 824, US-A 60 06609, US-A 60 92 429, US-B 62 23 605, US-B 63 11 136, US-B 64 77 901, US-B 65 05518, US-B 65 13 393, US-B 66 51 513, US-B 66 66 098, US-B 67 11 958, US-B 68 40109, US-B 69 20 798, US-B 70 17 424, US-B 70 40 181, US-B 70 77 014, US-B 72 00503、US-B72 16 549, US-B 72 96 484, US-B 73 25 462, US-B 73 60 451, US-B 77 92646, US-B 79 54 388, US-B 83 33 120, US-B 86 95 436, WO-A 00 / 19175、WO-A 00 / 34748、WO-A 01 / 02816、WO-A 01 / 71291、WO-A 02 / 060805、WO-A 2005 / 093381、WO-A 2007 / 043996、WO-A 2008 / 013545、WO-A 2008 / 059262、WO-A 2010 / 099276、WO-A 2013 / 092104、WO-A2014 / 151829、WO-A 2016 / 058745、WO-A 2017 / 069749、WO-A 2017 / 123214、WO-A 2017 / 143579、WO-A 85 / 05677、WO-A 88 / 02853、WO-A 89 / 00679、WO-A 94 / 21999、WO-A 95 / 03528、WO-A 95 / 16897、WO-A 95 / 29385、WO-A 98 / 02725、WO-A 99 / 40 394 or PCT / EP2017 / 067826. Thus, the exciter device of the measuring transducer is configured to convert the electrical power fed therein into mechanical power which causes a forced mechanical vibration of the at least one measuring tube, while the sensor device of the measuring transducer is configured to detect the mechanical vibration of the at least one measuring tube 10 and to provide a first vibration measurement signal s1 representing at least a part of the vibration movement of the at least one measuring tube and at least a second vibration measurement signal s2 representing at least a part of the vibration movement of the at least one measuring tube; this is in particular such that: the vibration measurement signals are measured using at least one phase difference The change in the phase angle of the vibration measurement signal s1 (or one of its spectral signal components) The phase angle with the vibration measurement signal s2 (or one of its spectral signal components) A change in at least one difference between the two - corresponds to a change in the mass flow rate of the medium being measured in the measuring tube. In addition, the vibration measurement signals s1, s2 can have at least one signal frequency and / or signal amplitude that depends on the density and / or viscosity of the measured material. According to another embodiment of the invention, the sensor arrangement according to the invention comprises: a first vibration sensor 51, such as an electric or piezoelectric or capacitive sensor, which is attached to the inlet side of at least one measuring tube or arranged in the vicinity thereof; and a second vibration sensor 52, such as an electric or piezoelectric or capacitive sensor, which is attached to the outlet side of at least one measuring tube or arranged in the vicinity thereof. As is quite common in vibration type measuring transducers and also in Figure 3 , the vibration sensors 51, 52 can, for example, also be positioned at the same distance from the center of the at least one measuring tube 10. In addition, the two vibration sensors 51, 52 can also be the only vibration sensors for detecting vibrations of the at least one measuring tube 10, so that the sensor arrangement does not have any other vibration sensors besides the vibration sensors 51, 52. According to a further embodiment of the invention, the exciter device is formed by means of at least one electromechanical, for example electric, electromagnetic or piezoelectric, vibration exciter 41, which is also Figure 3 As indicated, it can be positioned, for example, in the middle of at least one measuring tube 10 and / or can also be the only vibration exciter of the exciter device or the measuring transducer formed thereby, which causes vibrations of the at least one measuring tube. Furthermore, a temperature measuring device 71 for detecting the temperature in the tube device and / or a strain measuring device for detecting mechanical stresses in the tube device can also be arranged, for example, in the measuring transducer.

[0070] In order to process the vibration measurement signals s1, s2 supplied by the transducer, the transformer circuit US also has measurement and control electronics DSV. Figure 3As schematically shown in FIG. 1 , the measuring and control electronics DSV is electrically connected to the measuring transducer MW or its sensor device 51 , 52 and is configured to receive and evaluate the aforementioned vibration measurement signals s1, s2, i.e. to determine analog and / or digital mass flow rate measurement values ​​representing the mass flow rate based on at least two vibration measurement signals s1, s2 and, if necessary, also output them, for example in the form of digital values. The vibration measurement signals s1, s2 generated by the measuring transducer MW and fed, for example, via electrical connecting lines to the transformer circuit US or the measuring and control electronics DSV provided therein can initially also be preprocessed there, for example preamplified, filtered and digitized. According to another embodiment of the invention, the measuring and control electronics DSV accordingly has a first measurement signal input for the vibration measurement signal s1 and at least one second measurement signal input for the vibration measurement signal s2, and the measuring and control electronics DSV is further configured to determine the aforementioned phase difference from the vibration measurement signals s1, s2. In addition, the measuring and control electronics DSV can also be configured to determine each of the aforementioned phase angles and / or at least one signal frequency and / or one signal amplitude from at least one of the applied vibration measurement signals s1, s2, for example, i.e. to generate during operation a sequence of digital phase values ​​representing the corresponding phase angles and / or a sequence of digital frequency values ​​representing the signal frequencies and / or a sequence of digital amplitude values ​​representing the signal amplitudes. According to another embodiment of the invention, the measuring and control electronics DSV has a digital phase output and a digital amplitude output. In addition, the measuring and control electronics DSV is also designed to output an amplitude sequence at the amplitude output, i.e. a sequence of digital amplitude values ​​determined based on at least one of the vibration measurement signals, for example a signal amplitude of one of the vibration measurement signals being quantized, and a phase sequence at the phase output, i.e. a sequence of digital phase values ​​determined based on the vibration measurement signals.

[0071] The measuring and control electronics DSV can also be implemented, for example, by means of a microcomputer provided in the transformer circuit US, for example by means of a digital signal processor DSP, and by means of a program code implemented accordingly and running therein. The program code can, for example, be permanently stored in a non-volatile data memory EEPROM of the microcomputer and loaded into a volatile data memory RAM integrated into the microcomputer when the microcomputer is started. As already indicated, the vibration measurement signals s1, s2 will be converted into corresponding digital signals for processing in the microcomputer by means of corresponding analog-to-digital converters (A / D converters) of the measuring and control electronics DSV or transformer circuit US thus formed; in this regard, reference is made, for example, to the above-mentioned US-B 63 11 136 or US-A 2011 / 0271756. Correspondingly, according to another embodiment, in the measuring and control electronics, a first analog-to-digital converter for the first vibration measurement signal and a second analog-to-digital converter for the second vibration measurement signal are provided.

[0072] In order to control the measuring transducer, e.g. Figure 3 As schematically shown as a block diagram in the figure, the transformer circuit US also has drive electronics Exc, which are electrically coupled to the exciter device, for example via electrical connecting lines, and are electrically coupled to measurement and control electronics DSV - for example via a digital bus connection or electrical coupling inside the transformer circuit.

[0073] The drive electronics Exc and the measuring and control electronics DSV as well as other electronic components for operating the transformer circuit US of the measuring system, such as the internal power supply circuit VS for providing the internal DC supply voltage and / or the sending and receiving electronics COM for communicating with a higher-level measurement data processing system or an external fieldbus (from Figure 2 and Figure 3 The electronic device housing 200 can also be accommodated, for example, in a corresponding electronic device housing 200, which is particularly shock-proof and / or explosion-proof and / or hermetically sealed. Figure 2 As shown in FIG. 3 , the electronic device housing 200 can be mounted on the aforementioned transducer housing 100 to form a vibration measurement system or a Coriolis mass flowmeter with a compact design.

[0074] The electrical connection of the measuring transducer MW to the transformer circuit US can be realized by means of corresponding electrical connecting lines and corresponding cable feed-throughs. In this case, the connecting lines can be at least partially formed as electrical conductor lines, which are sheathed at least in some sections by electrical insulation, for example in the form of "twisted pair" lines, ribbon cables and / or coaxial cables. As an alternative or in addition, the connecting lines can also be formed at least in some sections by means of printed conductors of a printed circuit board, in particular a flexible, optionally coated printed circuit board.

[0075] In order to visualize on site the measured values ​​generated by the measuring system internally and / or possibly status messages generated by the measuring system internally on site, such as error messages or alarms, and / or to operate the measuring system on site, the measuring system can further include a display element HMI1 that communicates at least intermittently with the transformer circuit US and / or an operating element HMI2 that communicates at least intermittently with the transformer circuit US, such as an LCD, OLED or TFT display placed in the aforementioned electronic housing 200 behind a window provided therein, and a corresponding input keyboard and / or touch screen (as a combined display and operating element). According to another embodiment of the invention, the operating element HMI2 is designed to convert one or more manual inputs (of a user of the measuring system) into one or more control signals, for example, it also contains one or more (control) commands for the transformer circuit US, and is designed to send them to the transformer circuit US. Therefore, the transformer circuit US can also be configured to receive and process one or more control signals from the operating element HMI2, which may also contain one or more (control) commands, for example to execute one or more (control) commands transmitted by means of one or more control signals. Alternatively or additionally, the transformer circuit can also be configured to generate control signals for the aforementioned display element HMI1 and output them to the display element HMI1. In addition, the display element HMI1 can be configured to receive and process one or more control signals from the transformer circuit US, for example to display one or more messages transmitted by means of one or more control signals.

[0076] The drive electronics Exc of the measuring system are designed in particular to be operated intermittently in a first operating mode I and to generate in said first operating mode I an - for example bipolar and / or at least temporarily periodic, possibly also harmonic - electrical drive signal e1 and thus feed electrical power into the exciter device so that the at least one measuring tube performs a forced mechanical vibration - for example also to induce Coriolis forces in the measuring medium flowing through the at least one measuring tube, which have at least one useful frequency , i.e. a vibration frequency predetermined by the electrical drive signal e1 or its (useful) signal component E1, in particular corresponding to the resonance frequency of the measuring transducer, or each of the vibration measurement signals s1, s2, also as in Figure 4 As indicated in the figure, each vibration measurement signal contains a useful signal component or , i.e. a (spectral) signal component having a signal frequency corresponding to the useful frequency. Thus, the driver signal e1 can be, for example, a harmonic electrical signal forming the aforementioned signal component E1, which harmonic electrical signal determines the useful frequency , or for example can also be a multi-frequency electrical signal consisting of a plurality of (spectral) signal components and containing the aforementioned signal component E1, and which can also be periodic within a certain period of time. In addition, the measuring and control electronics are specifically designed to control the drive electronics Exc so that the drive electronics are operated in a first operating mode, in particular temporarily and / or for a period exceeding the inverse of the useful frequency and / or for a period exceeding 10 ms in each case, and so that at least one measuring tube (which has the drive electronics operated in the first operating mode) is operated at least during a first measuring interval, in particular corresponding to a period of more than the useful frequency The reciprocal of (1 / ) and / or lasts for more than 10ms, perform forced vibration.

[0077] To set or measure the useful frequency , the drive electronics can, for example, have one or more phase-locked loops (PLL), as are very common in vibration measuring systems or Coriolis mass flowmeters of the type in question. According to a further embodiment of the invention, the drive electronics Exc has a digital frequency output. In addition, the drive electronics Exc is also configured to output a frequency sequence at said frequency output, in particular a sequence of digital frequency values ​​quantizing the signal frequency set for the driver signal e1, such as in particular the currently set useful frequency (or the signal frequency of its signal component E1). According to a further embodiment of the invention, it is further provided that the aforementioned phase output of the measuring and control electronics DSV is electrically connected to a phase input formed, for example, by means of a phase comparator provided in the drive electronics Exc. For example, the phase comparator can also be configured to detect the aforementioned signal component E1 of the driver signal e1 and the aforementioned useful component , In addition, the amplitude output of the measuring and control electronics DSV can also be electrically connected to the amplitude input of the drive electronics Exc, which detects the amplitude of the signal component or the vibration excited thereby in the at least one measuring tube.

[0078] The aforementioned (forced) mechanical vibrations excited by means of the drive electronics Exc and the exciter device (41) connected thereto can - as is quite common in vibration measuring systems of the type in question, in particular also Coriolis mass flowmeters - be, for example, bending vibrations of at least one measuring tube 10 about an associated rest position, wherein the useful frequency The instantaneous resonance frequency can be set, for example, also depending on the density and / or viscosity of the measured substance carried in the at least one measuring tube of the fundamental bending vibration mode of the at least one measuring tube 10 having only a single vibration slot.

[0079] Due to the vibration of the at least one measuring tube 10, for example the aforementioned bending vibration, Coriolis forces can be generated in the measured material flowing through the at least one measuring tube, as is known; this in particular causes the aforementioned useful signal component of the vibration measurement signal s1 or s2 , Each of them has a corresponding (spectral) measurement component S1' or S2', which has a frequency corresponding to the useful frequency The signal frequency and the phase angle depend on the mass flow rate m of the measured material flowing through the measuring transducer MW (S1' = f(m), S2' = f(m)); therefore, also as in Figure 4 As indicated in FIG. 1 , there is a phase difference between the measured component S1 ′ of the vibration signal s1 and the measured component S2 ′ of the vibration signal s2 that depends on the mass flow rate m. .

[0080] Therefore, the measuring and control electronics DSV is further configured to evaluate the first vibration measurement signal s1 and the second vibration measurement signal s2, i.e. based on the vibration measurement signals s1, s2 received during at least one or more of the aforementioned first measurement intervals, for example based on the corresponding first phase difference , i.e. the vibration measurement signal s1 (or its useful signal component) received (during one or more first measurement intervals) ) phase angle and the vibration measurement signal s2 (or its useful signal component) (received during one or more first measurement intervals) ) phase angle to determine one or more mass flow rate measurements, also digital, such as , i.e. a measured value representing the mass flow rate (of the measured substance guided in the at least one measuring tube).

[0081] According to a further embodiment of the invention, the measuring and control electronics is further arranged based on the vibration measurement signals s1, s2 received during one or more first measurement intervals to first determine one or more, in particular digital, (first) phase difference measurement values , each phase difference measurement represents a first phase difference (of the vibration measurement signals s1, s2 received during one or more first measurement intervals) , for example in order to use one or more (first) phase difference measurements To determine the mass flow rate measurement Alternatively or additionally, the measurement and control electronics can also be configured to determine, based on the vibration measurement signals s1 received during the one or more first measurement intervals, a first phase angle representing the vibration measurement signal s1 received during the one or more first measurement intervals. One or more specific digital (first) phase angle measurements and / or determining a second phase angle representative of the vibration measurement signal s2 received during the one or more first measurement intervals based on the vibration measurement signal s2 received during the one or more first measurement intervals One or more specific digital (second) phase angle measurements The aforementioned phase angle , Or phase angle measurement , It can be determined, for example, with reference to the electric driver signal e1 or to an internal (clock) reference signal of the transformer circuit US, in particular generated by means of measuring and control electronics DSV or driver electronics Exc, wherein the clock frequency corresponds to the useful frequency, for example as a phase difference of the useful signal component E1 of the electric driver signal e1 or the aforementioned (clock) reference signal.

[0082] As already mentioned, when the drive electronics Exc is operated in the first operating mode or when the driver signal e1 is fed into the exciter device, each of the vibration measurement signals s1, s2 (also as in Figure 4 as indicated in or as can be obtained from Figure 1 and 4 In addition to the aforementioned measurement components S1' or S2', each vibration measurement signal can also have an interference component S1" or S2", which has the same frequency but is still undesirable. Each vibration measurement signal has a phase angle that depends on the aforementioned signal component E1 of the driver signal e1 and also depends on the amplitude of the signal component E1. Figure 4As indicated, the phase angles and / or amplitudes of the interference components S1″ or S2″ can differ from one another. In addition, the same phase angle and amplitude can vary during operation, for example due to a changing useful frequency and / or a changing amplitude of the signal component E1 or depending on the measured material in the at least one measuring tube. The aforementioned interference components can be caused, for example, by electromagnetic coupling of the driver signal into the vibration signal or by aging or (excessive) loading of the measuring transducer or of the measuring system formed thereby.

[0083] Due to the aforementioned interference components S1″ or S2″ contained in the vibration measurement signals s1, s2 or their useful signal components , , when the drive electronics Exc operates in the first operating mode, in the useful signal component , The actual measurable (first) phase difference between Not only depends on the mass flow rate m , or conversely, the phase difference (You can also Figure 4 It can be seen that the measured components S1', S2' can deviate significantly The phase difference between In other words, the vibration measurement signals s1, s2 or their useful signal components , can have a corresponding phase error Err caused by the aforementioned interference component S1" or S2" .

[0084] In order to detect the aforementioned interference components S1″, S2″ in the vibration measurement signals s1, s2 or in the corresponding phase errors Err of the vibration measurement signals as early as possible and as reliably as possible and, if necessary, also to quantify and / or compensate for them during operation of the measuring system, the drive electronics Exc is also designed to occasionally operate in a second operating mode, for example, to switch from the aforementioned first operating mode I to a second operating mode II and to suspend the generation of the electric driver signal e1 in said second operating mode, so that during this time no electric power is fed into the exciter device by the drive electronics and so that the forced mechanical vibrations of at least one measuring tube are replaced by free damped vibrations, for example, during the (previous) first operating mode I; this also means, for example, that the drive electronics Exc occasionally operates in an alternating manner in the first operating mode I or in the second operating mode II, or switches multiple times from the first operating mode I to the second operating mode and back to the first operating mode I. Figure 4 It can be seen that a temporary interruption or switching off of the driver signal e1 can on the one hand cause the useful signal components of the signal measurement signals s1 , s2 generated during the second operating mode to , The magnitude of each of the |、| |) and the useful signal component detected when the drive electronics Exc operates in the first operating mode I , The magnitude of each of the |、| On the other hand, such a switch-off of the driver signal e1 also has the following consequence: due to the absence of the driver signal e1, the useful signal component , The aforementioned interference components S1″, S2″ are then not included or no longer included and therefore correspond essentially to the measured components S1′, S2′, so that in the useful signal component , The measurable phase difference established between This corresponds very accurately to the measured mass flow rate m The actual required phase difference On the contrary, knowing the first phase difference And the second phase difference or the phase angle of each useful signal component, the aforementioned phase error can be at least approximately determined or quantified during operation of the measuring system. . Therefore, the measuring and control electronics DSV is also configured to occasionally and, for example, also in a time- or event-controlled manner during operation of the measuring system cause or initiate a change of the drive electronics Exc from the first operating mode to the second operating mode (or vice versa), so that the at least one measuring tube 10 performs free damped vibrations at least during the (e.g. predetermined and / or adaptable) second measuring interval when the drive electronics Exc is in the second operating mode, and also receives (corresponding) vibration measurement signals s1, s2 during one or more second measuring intervals. In addition, the measuring and control electronics DSV of the measuring system according to the invention is also configured to evaluate the vibration measurement signals s1, s2 received in each case during one or more first and second measuring intervals, i.e. to determine one or more, for example digital, phase error measurement values ​​based on these vibration measurement signals s1, s2 (received in each case during one or more first and second measuring intervals). . For this purpose, as already indicated, the measuring and control electronics DSV can be configured, for example, to cause the drive electronics Exc to change, in each case automatically, for example in a time- or event-controlled manner, from the first operating mode I to the second operating mode II or vice versa. Alternatively or in addition, the measuring and control electronics DSV can also be configured to effect the aforementioned change of the drive electronics Exc from the first operating mode I to the second operating mode II based on a control signal which can also be generated outside the transformer circuit US. The control signal can be generated, for example, by means of the aforementioned operating element HMI2 or also by the aforementioned data processing system (connected to the measuring system) and can have been received via the aforementioned sending and receiving electronics COM. Furthermore, the control signal can contain, for example, a message reporting that the mass flow is stationary and / or that the measured material is inhomogeneous, and / or a control command which (directly) causes a change from the first operating mode I to the second operating mode II.

[0085] In the measurement system according to the present invention, the phase error measurement value In particular, it represents, for example, a quantification of one or more first phase differences (of the vibration measurement signals s1, s2 received during one or more first measurement intervals) One or more second phase differences from the vibration measurement signals s1, s2 received during one or more second measurement intervals Alternatively or additionally, the phase error measurement It is also possible to represent or quantify one or more first phase angles (of the vibration measurement signal s1 received during one or more first measurement intervals) One or more third phase angles of the vibration measurement signal s1 received during one or more second measurement intervals The (measured) deviation and / or one or more second phase angles (of the vibration measurement signal s2 received during one or more first measurement intervals) One or more fourth phase angles of the vibration measurement signal s2 received during the one or more second measurement intervals In addition, one or more phase error measurements The (first and / or higher order) time derivative of at least one of the aforementioned (measured) deviations is also represented or quantified. The aforementioned (measured) deviation can also be, for example, an absolute or relative (measured) deviation. The aforementioned (third) phase angle and (fourth) phase angle can be very simple (with phase angle or The phase difference is measured in the same way as the phase difference of a previous (clock) reference signal.

[0086] The second measurement interval or the second operating mode II can also advantageously be selected such that the second measurement interval and / or the second operating mode II each last for more than 10 ms (milliseconds), for example more than 100 ms, and / or each exceeds the reciprocal value of the useful frequency (1 / ), for example even more than 5 times the reciprocal value. Alternatively or additionally, the second measurement interval or the second operating mode II can be selected such that they are each shorter than 1 s (second).

[0087] According to another embodiment of the invention, the measuring and control electronics DSV is further configured to implement the change of the drive electronics Exc from the first operating mode to the second operating mode in a time-controlled manner or to perform it in a time-controlled manner, for example, such that said change from the second operating mode II back to the first operating mode I or vice versa occurs multiple times cyclically or in a time-controlled manner within a predetermined or predeterminable time period. For example, the measuring and control electronics and / or the drive electronics can also be configured to cyclically change the drive electronics from the first operating mode to the second operating mode, such that the drive electronics changes from the first operating mode to the second operating mode multiple times within one cycle and vice versa, and / or such that the drive electronics mainly operates in the first operating mode within one cycle, and / or the drive electronics operates in the first operating mode at least as frequently and / or as long as in the second operating mode within one cycle.

[0088] Phase error measurement It can also be used, for example, to check the measuring system and / or the measuring material, for example to determine whether the measuring system has suffered a malfunction, possibly even an irreversible malfunction, and / or to determine whether one or more material parameters of the measuring material are outside the specification defined for it. Alternatively or additionally, for example, when determining the mass flow rate measurement value The phase error measurement can also be considered accordingly. , for example, because the measuring and control electronics is also configured to use one or more phase error measurement values ​​by means of the measuring and control electronics DSV during operation of the measuring system to calculate the correction value corresponding to the phase error Err in each case, or using one or more phase error measurements To determine one or more (future) mass flow rate measurements .

[0089] Therefore, according to another embodiment of the invention, the measurement and control electronics DSV is configured to use one or more phase error measurement values to calculate at least one correction value for reducing or compensating for a first phase difference (of the vibration measurement signals s1, s2 received during one or more first measurement intervals) and is configured to determine the mass flow rate measurement value. or is configured to also use at least one correction value to calculate the mass flow rate measurement value Alternatively or in addition, the measurement and control electronics DSV can also be configured to measure one or more mass flow rate measurement values ​​also based on the vibration measurement signals s1, s2 received during the one or more second measurement intervals. According to a further embodiment of the invention, the measuring and control electronics is therefore also configured to determine one or more, for example also digital, (second) phase difference measurement values ​​based on the vibration measurement signals s1, s2 received during one or more second measurement intervals. , so that the phase difference measurement value is the (second) phase difference between the vibration measurement signals s1, s2 (received during one or more second measurement intervals) In addition, the measurement and control electronics DSV can be configured to also use the (second) phase difference One or more of these phase difference measurements To determine one or more mass flow rate measurements Alternatively or in addition, the measurement and control electronics DSV can also be configured to measure one or more phase error values ​​based on a deviation between the first mass flow rate measurement value and the second mass flow rate measurement value. In addition, the phase error measurement value Can also be used as a measure of medium viscosity or phase error measurement and measurement system specific (calibration) factors Together they can be converted into viscosity measurements accordingly .

[0090] For the aforementioned compensation of the phase error Err and, if necessary, also the aforementioned calculation of the correction value, as well as the checking of the measuring system or the measured material, it is possible, for example, to use a plurality of phase error measurement values ​​determined successively over time. The statistical calculations performed are based on the phase error measurements. This can be done advantageously on site, if necessary without interrupting the operation of the industrial plant involved in the measuring system, and / or for the case where the measuring transducer measures a measuring material flowing with a mass flow rate which is not equal to zero (in particular at least approximately constant or stationary for a plurality of temporally consecutive first and second measuring intervals (m>0 and / or dm / dt ≈ 0)). For this purpose, according to a further embodiment of the invention, the measuring and control electronics DSV is configured to use a plurality of phase error measurement values. to calculate one or more eigenvalues ​​of at least one statistical (measurement system) eigenvalue, for example, including a plurality of phase error measurements A position measurement or a dispersion measurement of a set of measurement values, for example, such that one or more eigenvalues ​​quantify the phase error measurement value The (central) trend and / or one or more eigenvalues ​​quantify the phase error measurement The width of the dispersion of one or more of their position measurements. Such a (measurement system) characteristic value can be, for example, the mode, the median, the (empirical) mean, the (empirical) variance, the (empirical) standard deviation or a (phase error measurement value) However, alternatively or additionally, one or more phase error measurements may be Such parameters can also be determined in such a way that they themselves represent or quantify (descriptive) statistics, namely one or more phase error measurement values can also itself already be used as a characteristic value of at least one statistical (measurement system) characteristic value. In particular, the measuring and control electronics can also be configured to measure one or more phase error measurement values , so that they each represent or quantify the first phase angle With the third phase angle and / or second phase angle With the fourth phase angle and / or the first phase difference The second phase difference the (central) trend of the (measured) deviation, and / or they each represent or quantify the first phase angle With the second phase angle and / or second phase angle With the fourth phase angle and / or the first phase difference The second phase difference The measurement of the dispersion of the (measurement) deviation of the mass flow rate is carried out by means of the measuring and control electronics DSV, in which one or more phase error measurement values ​​are calculated based on the deviation between the first mass flow rate measurement value and the second mass flow rate measurement value. In the foregoing case, in addition, the phase error measurement value one of which can also represent in each case a difference between a first mass flow rate measurement value and a second mass flow rate measurement value determined immediately before or after it in time, and / or a position measure for a plurality of such differences between the first mass flow rate measurement value and the second mass flow rate measurement value, and / or a difference between position measures determined in each case for a plurality of first mass flow rate measurement values ​​and the second mass flow rate measurement value, and / or a dispersion measure for a plurality of such differences between the first mass flow rate measurement value and the second mass flow rate measurement value, and / or a difference between scatter measures determined in each case for a plurality of first mass flow rate measurement values ​​and the second mass flow rate measurement value.

[0091] It is also possible to measure one or more phase error values ​​by comparison with one or more (phase error) reference values ​​or (phase error) threshold values, e.g. also during operation on site or in a plant, to perform a check of the measuring system or the measured material; this can, e.g., be done in such a way that phase error measurement values ​​which represent measurement deviations which change rapidly over time and / or fluctuate strongly or which are only temporary or which exceed a predetermined level are not detected. is evaluated as an indicator of disturbances in the measured material, for example in the form of multiphase flow and / or due to foreign matter entrained in the material, and / or such that a phase error measurement value indicates a slowly and / or continuously increasing measurement deviation or exceeds a predetermined level is evaluated as an indicator of a malfunction of the measuring transducer. Therefore, according to a further embodiment of the invention, the measuring and control electronics DSV is further configured to determine one or more phase error measurement values a deviation from at least one associated phase error reference value, which represents, for example, a (pre-)determined phase error measurement value under reference conditions and / or during a (re)calibration of the measuring system , and / or configured to convert one or more phase error measurements is compared with at least one (measurement system specific) phase error threshold value, which represents, for example, the maximum permissible phase error measurement value or a fault in the measuring system and / or the measuring material. In addition, if one or more phase error measurements The phase error measurement value has exceeded the above At least one phase error threshold value, the measuring and control electronics DSV can also be configured to issue a corresponding (error) message, for example also by means of the aforementioned display element HMI1. The aforementioned phase error reference value or phase error threshold value can be at least partially determined, for example, by the manufacturer (for example, at the factory) and / or in the course of a possibly repeated calibration of the measuring system (under reference conditions) on site and can be stored accordingly in the transformer circuit, for example in a non-volatile (data) memory of the transformer circuit US, such as the aforementioned non-volatile data memory EEPROM.

[0092] Although, as already mentioned, the determination of the phase error Err can also be performed when the measured material flows through the measuring transducer with a mass flow rate different from zero, it can be advantageous - in particular when the measuring system is used in plants or processes with (high) dynamic mass flows, so that the measured material often has a non-stationary and / or highly temporally varying mass flow rate - at least when determining the phase error measurement value In order to introduce or provide a mass flow in the system within the required short period of time, which mass flow is as stationary as possible or at most slightly fluctuating, or, on the contrary, to report such a stationary mass flow to the measuring system. For this purpose, according to another embodiment of the invention, the measuring and control electronics or the transformer circuit US formed thereby is further configured (when the drive electronics Exc is operated in the first operating mode I or before the drive electronics Exc switches from the first operating mode to the second operating mode) to generate a message, for example to output it by means of the aforementioned control signal and / or to send it to the aforementioned display element HMI1, which indicates or causes the mass flow of the measured material guided in the at least one measuring tube to be set to a constant (mass flow) value, for example also to zero. Alternatively or in addition, the measuring and control electronics DSV or the transformer circuit US formed thereby can also be triggered based on a control signal applied to the transformer circuit US, for example by a (start) command sent therewith and / or a message sent therewith that the mass flow of the measured material carried in the at least one measuring tube is constant or zero, to achieve a change (possibly also a plurality of changes) of the drive electronics from the first operating mode to the second operating mode (and vice versa).

Claims

1. A vibration measurement system, in particular a Coriolis mass flowmeter, include: - transducer; The transducer: -- having at least one measuring tube, -- With exciter device -- and having a sensor device; - and an electronic transformer circuit (US) electrically coupled to both the exciter device and the sensor device, the electronic transformer circuit (US) being formed and / or programmable in particular by means of at least one microprocessor, the transformer circuit (US): -- With measurement and control electronics (DSV) - and having drive electronics (Exc) which are connected, in particular electrically connected, to the measuring and control electronics and / or are controlled by the measuring and control electronics; - wherein the measuring tube is configured to conduct a fluid measured substance, in particular a gas, a liquid or a dispersion, which flows at least intermittently and during this process is to be vibrated; - wherein the exciter device is configured to convert the electrical power fed to the exciter device into mechanical power causing forced mechanical vibration of the at least one measuring tube; - wherein the sensor device is arranged to detect mechanical vibrations of the at least one measuring tube and to provide a first vibration measurement signal (s1) at least partially representative of the vibration movement of the at least one measuring tube and at least one second vibration measurement signal (s2) at least partially representative of the vibration movement of the at least one measuring tube, in particular such that the first vibration measurement signal and the second vibration measurement signal follow changes in the mass flow rate of the measured substance guided in the measuring tube with a change in the phase difference, i.e. a change in the difference between the phase angle of the first vibration measurement signal and the phase angle of the second vibration measurement signal; - wherein the drive electronics (Exc) are configured to generate an electrical drive signal (e1) in a first operating mode (I) and thus feed electrical power into the actuator device such that: - the at least one measuring tube performs a forced mechanical vibration with at least one useful frequency, ie a vibration frequency predetermined by the electrical driver signal, in particular corresponding to the resonance frequency of the measuring transducer -- and the first vibration measurement signal (s1) has a first phase angle and the second vibration measurement signal (s2) has a second phase angle, - and wherein the drive electronics (Exc) is configured as - suspending the generation of the electric driver signal in a second operating mode (II) so that during this time no electric power is fed by the drive electronics (Exc) into the actuator device; - wherein the measurement and control electronics (DSV) is configured to control the drive electronics such that - the drive electronics are initially operated in the first operating mode, in particular temporarily and / or for a period exceeding the inverse of the useful frequency and / or for a period exceeding in each case 10 ms, and the at least one measuring tube (in the case of operation of the drive electronics in the first operating mode) performs a forced oscillation at least during a first measuring interval, in particular corresponding to a period exceeding the inverse of the useful frequency and / or for a period exceeding 10 ms, - and the drive electronics subsequently changes from the first operating mode (I) to the second operating mode (II) (or vice versa) or operates alternately in the first operating mode (I) or the second operating mode (II), whereby the at least one measuring tube (when the drive electronics is operated in the second operating mode) performs a free damped vibration at least during a second measuring interval, the second measuring interval in particular corresponding to a value exceeding the inverse of the useful frequency and / or lasting more than 10 ms and / or less than 1 s, and the first vibration measurement signal (s1) has a third phase angle and the second vibration measurement signal (s2) has a fourth phase angle; - and wherein the measuring and control electronics is configured to receive and evaluate the first vibration measurement signal and the second vibration measurement signal, in particular, -- to determine one or more, in particular digital, mass flow rate measurement values ​​based on at least one or more first vibration measurement signals and second vibration measurement signals received during at least one or more first measurement intervals ( ), i.e., a measured value representing the mass flow rate (of the measured substance carried in the at least one measuring tube), - and determining, based on the first vibration measurement signal and the second vibration measurement signal received during the one or more first measurement intervals and the second measurement intervals, respectively, representing one or more, in particular digital, phase error measurement values ​​( ), specifically, --- (measured) deviation, in particular absolute or relative, of one or more first phase angles (of the first vibration measurement signal received during the one or more first measurement intervals) and one or more third phase angles (of the first vibration measurement signal received during the one or more second measurement intervals) --- and / or a (measured) deviation, in particular absolute or relative, of one or more second phase angles (of the second vibration measurement signal received during the one or more first measurement intervals) from one or more fourth phase angles (of the second vibration measurement signal received during the one or more second measurement intervals) ---and / or one or more first phase differences of the first vibration measurement signal and the second vibration measurement signal received during one or more first measurement intervals and one or more second phase differences of the first vibration measurement signal and the second vibration measurement signal received during one or more second measurement intervals, in particular absolute and / or relative (measured) deviations.

2. The measuring system according to claim 1, - in, The measurement and control electronics are configured to use one or more phase error measurements ( ) to determine one or more mass flow rate measurements ( ), in particular such that the measurement and control electronics is configured to use one or more phase error measurements ( ) to determine at least one correction value for reducing or compensating for a phase error contained in the first phase difference (of the first vibration measurement signal and the second vibration measurement signal received during one or more first measurement intervals) and in determining the mass flow rate measurement value ( ), or is configured to use the at least one correction value to calculate the mass flow rate measurement value ( ); and / or - wherein the measurement and control electronics is configured to use a plurality of phase error measurements ( ) to calculate one or more characteristic values ​​of at least one statistical (measurement system) characteristic value, in particular comprising a plurality of phase error measurements ( ), in particular such that one or more eigenvalues ​​quantify the phase error measurement value ( ) and / or one or more eigenvalues ​​quantifying the phase error measurement value ( ) is the dispersion parameter.

3. The measuring system according to claim 1, - in, One or more phase error measurements ( ) represents, in particular quantifies, the (central) trend of the (measured) deviations of one or more first phase angles from one or more second phase angles, in particular the mode, median, (empirical) mean of the (measured) deviations; and / or - where one or more phase error measurements ( ) represents, in particular quantifies, the (central) trend of the (measured) deviations of the one or more third phase angles from the one or more fourth phase angles, in particular the mode, the median, the (empirical) mean of the (measured) deviations; and / or - where one or more phase error measurements ( ) represents, in particular quantifies, a (central) trend of the (measured) deviations of one or more first phase differences from one or more second phase differences, in particular the mode, median, (empirical) mean of the (measured) deviations; and / or - where one or more phase error measurements ( ) a dispersion parameter representing, in particular quantifying, a (measured) deviation of the one or more first phase angles from the one or more second phase angles, in particular an (empirical) variance, an (empirical) standard deviation or a range; and / or - where one or more phase error measurements ( ) a dispersion parameter representing, in particular quantifying, the (measured) deviation of the one or more second phase angles from the one or more fourth phase angles, in particular an (empirical) variance, an (empirical) standard deviation or a range; and / or - where one or more phase error measurements ( ) represents, in particular quantifies, a dispersion parameter, in particular an (empirical) variance, an (empirical) standard deviation or a range, of a (measured) deviation of one or more first phase differences from one or more second phase differences.

4. The measuring system according to any one of the preceding claims, - in, The measurement and control electronics are configured to determine one or more phase error measurements ( ) and at least one phase error reference value, in particular representing a phase error measurement value determined under reference conditions and / or during a (re)calibration of the measuring system ( ) of the phase error reference value; and / or - wherein the measurement and control electronics is configured to convert one or more phase error measurements ( ) and at least one phase error threshold, in particular specific to the measuring system and / or representing a maximum permissible phase error measurement value ( ) or a phase error threshold value of an error in the measurement system and / or the measurement material, and in particular is configured to compare if one or more phase error measurement values ​​( ) has exceeded at least one phase error threshold, an (error) message is output.

5. The measuring system according to any one of the preceding claims, in, The measurement and control electronics are configured to also measure one or more mass flow rate measurements based on the first vibration measurement signal and the second vibration measurement signal received during the one or more second measurement intervals. ).

6. The measuring system according to any one of the preceding claims, in, The measuring and control electronics is configured to determine one or more, in particular digital, (first) phase angle measurement values ​​( ) representing the first phase angle (of the first vibration measurement signal received during the one or more first measurement intervals) based on the first vibration measurement signals received during the one or more first measurement intervals. ).

7. The measuring system according to any one of the preceding claims, in, The measuring and control electronics is configured to determine one or more, in particular digital, (second) phase angle measurement values ​​( ) representing the second phase angle (of the second vibration measurement signal received during the one or more first measurement intervals) based on the second vibration measurement signal received during the one or more first measurement intervals. ).

8. The measuring system according to any one of the preceding claims, in, The measuring and control electronics is configured to determine one or more, in particular digital, (third) phase angle measurement values ​​( ) representing the third phase angle (of the first vibration measurement signal received during the one or more second measurement intervals) based on the first vibration measurement signal received during the one or more first measurement intervals. ).

9. The measuring system according to any one of the preceding claims, in, The measuring and control electronics is configured to determine one or more, in particular digital, (fourth) phase angle measurement values ​​( ) representing the fourth phase angle (of the second vibration measurement signal received during the one or more second measurement intervals) based on the second vibration measurement signals received during the one or more second measurement intervals. ).

10. The measuring system according to any one of the preceding claims, in, The measuring and control electronics is configured to determine one or more, in particular digital, (first) phase difference measurement values ​​based on the first vibration measurement signal and the second vibration measurement signal received during one or more first measurement intervals. , i.e. a measurement value representing the (first) phase difference between the first vibration measurement signal and the second vibration measurement signal (received during one or more first measurement intervals).

11. The measuring system according to the preceding claim, in, The measurement and control electronics are configured to use one or more first phase difference measurements To determine one or more mass flow rate measurements ( ).

12. The measuring system according to any one of the preceding claims, in, The measuring and control electronics is configured to determine one or more, in particular digital, (second) phase difference measurement values ​​based on the first and second vibration measurement signals received during one or more second measurement intervals. , i.e. a measured value representing a (second) phase difference between the first vibration measurement signal and the second vibration measurement signal (received during one or more second measurement intervals).

13. The measuring system according to the preceding claim, in, The measurement and control electronics are configured to use one or more second phase difference measurements To determine one or more mass flow rate measurements ( ).

14. The measuring system according to any one of the preceding claims, - in, the transformer circuit, in particular its measuring and control electronics, being configured to generate a message, in particular to output the message by means of a control signal and / or to send the message to a display element of the measuring system, in particular when the drive electronics are operated in the first operating mode or before switching the drive electronics from the first operating mode to the second operating mode, which message indicates or causes the mass flow of the measured material conducted in the at least one measuring tube to be set to a constant (mass flow rate) value, in particular a zero (mass flow rate) value; and / or - wherein the transformer circuit, in particular its measuring and control electronics, is configured to automatically effect, in particular multiple, changes of the drive electronics from the first operating mode to the second operating mode and vice versa, in particular in a time-controlled and / or event-controlled manner and / or based on a trigger applied to the transformer circuit, in particular by a (start) command sent thereby and / or a message sent thereby that the mass flow rate of the measured material conducted in the at least one measuring tube is constant or zero.

15. The measuring system according to any one of the preceding claims, further comprising: include: Display element (HMI1).

16. The measuring system according to the preceding claim, - in, The transformer circuit is configured to generate a control signal for the display element (HMI1) and is configured to output the control signal to the display element (HMI1); and / or - in, The display element (HMI1) is configured to receive and process one or more control signals from the transformer circuit, in particular to display one or more messages sent by means of the one or more control signals.

17. The measuring system according to any one of the preceding claims, further comprising: include: Operating element (HMI2).

18. The measuring system according to the preceding claim, - in, the operating element (HMI2) being configured to convert one or more manual inputs into one or more control signals, in particular containing one or more (control) commands for the transducer circuit, and to send the control signals to the transformer circuit; and / or - wherein the transformer circuit is configured to receive one or more control signals from the operating element (HMI2) and process one or more control signals, in particular containing one or more (control) commands, in particular to execute one or more (control) commands sent by means of the one or more control signals.

19. The measuring system according to any one of the preceding claims, - in, The sensor device for detecting mechanical vibrations of the at least one measuring tube comprises a first vibration sensor (51) and a second vibration sensor (52), the first vibration sensor (51) providing - in particular electrically and / or at the inlet side - the first vibration measurement signal, the second vibration sensor (52) providing - in particular electrically and / or at the outlet side - the second vibration measurement signal, and / or the second vibration sensor (52) being identical in its design to the first vibration sensor - and in particular having no further vibration sensors besides the first vibration sensor and the second vibration sensor; and / or - Among them, for The exciter device for exciting the vibrations of the at least one measuring tube has an in particular electric and / or single first vibration exciter (41); and / or - wherein said drive electronics are electrically connected to said actuator means; and / or - wherein the measurement and control electronics are electrically coupled to the sensor device; and / or - wherein the measuring and control electronics has a first analog-to-digital converter for the first vibration measurement signal and a second analog-to-digital converter for the second vibration measurement signal.

20. The measuring system according to any one of the preceding claims, in, The measuring and control electronics is arranged to determine a phase error value (also) in the case of a flow of the measuring material through the measuring transducer at a mass flow rate different from zero. ), the mass flow rate being at least approximately constant or stationary, in particular for a plurality of consecutive first and second measuring intervals.

21. Use of a measuring system according to any of the preceding claims for measuring and / or monitoring a fluid measuring material, in particular a gas, a liquid or a dispersion, which flows at least intermittently in a pipeline, in particular flows at least intermittently inhomogeneously and / or at least intermittently in two or more phases in the pipeline.

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