Measuring system for measuring the mass flow of a flowing fluid substance to be measured and method for operating such a measuring system

Abstract

In the measurement system or method according to the invention, a Coriolis mass flow meter is used to determine a (mass flow) measurement value representing the mass flow rate (m) of a metric substance flowing in a pipeline, and a pressure measuring device (P1) is used to detect the (static) pressure (p1) of the metric substance, which varies with time, and to generate a pressure signal (d1), in which at least one signal parameter responds to the change in pressure (p1) over time. The pressure signal (d1) is used to detect or compensate for a fault in the measurement system caused by a periodic (pressure) change in pressure (p1) having a (pressure oscillation) frequency (), which deviates from the effective frequency (m) of one or more measuring tubes of the Coriolis mass flow meter by a (positive) integer multiple M less than 10% of the effective frequency (m) or corresponding to a (positive) integer multiple (M) of the effective frequency (m).

Description

Technical Field

[0001] The present invention relates to a measurement system for measuring the mass flow rate of a fluid substance to be measured, comprising a (process) pipeline, a Coriolis mass flow meter and at least one pressure gauge, and to a method for operating such a measurement system. Background Technology

[0002] In US-B 6311136, US-B 7406878, US-B 8671776, US-B 10809109, US-A 2021 / 0140804, WO-A 2004 / 072588, WO-A 2008 / 0115 / 87, WO-A 2008 / 109841, WO-A 2011 / 068500, WO-A 2012 / 170020, WO-A 2021 / 154289, WO-A Each of 2023 / 200 / 431, or even the applicant’s own German patent application 10 / 2023122903.6 (which has no prior publication), shows a measurement system consisting of a (process) line (e.g., a pipe) and at least one (independent) Coriolis mass flow meter for measuring the mass flow rate of a fluid substance (e.g., gas, liquid, or dispersion) to be measured in the relevant (process) line, wherein the Coriolis mass flow meter has at least one (first) measuring tube, which is made of, for example, (stainless steel) steel and (fluidly) integrated into the stroke of the aforementioned (process) line, and the (process) line has a first line section connected to the Coriolis mass flow meter at the inlet side and a second line section connected to the Coriolis mass flow meter at the outlet side, and wherein at least one flow passage (of the measurement system) is formed to involve an inner cavity of each of the first and second line sections and at least one measuring tube of the Coriolis mass flow meter. The Coriolis mass flow meters suitable for forming the type of measurement system discussed are also manufactured by the applicant and are available, for example, at https: / / www.endress.com / de / searchy?filter.text=promass or under the trade names “Promass F 200”, “PROMASS G 100”, “PROMASS O100”, “PROMASS 83 E”, “PROMASS 84 F”, “CNGmass”, “LPGmass”, or “Dosimass”.In US-B 6311136, US-B 10809109, US-A 2021 / 0140804, WO-A 2008 / 011587, WO-A 2011 / 068500, WO-A 2012 / 170020, WO-A 2021 / 154289 or WO-A In the measurement system disclosed in 2023 / 200431, in each case, the Coriolis mass flow meter further includes at least one second measuring tube (fluidly) integrated into the (pipeline) and connected (fluidly) in parallel with a corresponding first measuring tube—where a first and a second diverter are inserted—and the first diverter (serving as a branch of the pipeline) is fluidly connected to the first and second measuring tubes respectively at the respective ends of the first and second tubes, and the second diverter (serving as a pipe joint) is fluidly connected to the first and second measuring tubes, wherein the inner cavity of the second measuring tube of the Coriolis mass flow meter also involves a flow passage. Additionally, each of the corresponding Coriolis mass flow meters is also configured to allow flow of the analyte through it, and during this process, to cause it to vibrate to generate a Coriolis force or oscillating signal, which can be used to measure the mass flow rate. In each case, the Coriolis mass flow meter that can be used or is used in the above-described measurement system also has an electromechanical actuator device, which is typically formed by one or more electrically oscillating actuators (spaced apart from each other along at least one measuring tube and / or constructed identically) for stimulating forced mechanical (bending) oscillations of at least one measuring tube; a sensor device, which is typically formed by one or more electrodynamic oscillating sensors for detecting the mechanical (bending) oscillations of at least one measuring tube; and a (mass flow) converter electronics unit electrically connected to the actuator device and the sensor device.

[0003] In each case, the (mass flow) converter electronics of the Coriolis mass flow meter are further configured, in particular, to generate an exciter signal for the exciter device, which is fed into the exciter device electrical (exciter) power for exciting an effective oscillation, i.e., a forced mechanical (bending) oscillation of at least one measuring tube around a rest position with an effective frequency (used to generate Coriolis force in the fluid to be measured), the effective frequency typically being greater than 50 Hz and / or less than 2000 Hz, i.e., a predetermined (target) oscillation frequency—typically corresponding to the mechanical resonant frequency of the measuring tube or the Coriolis mass flow meter formed therewith, and thus depending on the viscosity and / or density of the medium being measured—such that the exciter signal includes or contains at least one effective component, i.e., an (AC) current component, having an (AC) frequency corresponding to the (instantaneous or excited) effective frequency, in particular an (AC) frequency corresponding to the effective frequency and a current intensity corresponding to the (target) oscillation amplitude. Furthermore, in each case, the exciter device is configured to convert the electrical power fed by the excitation signal into mechanical power (which causes effective oscillation of at least one measuring tube), and the sensor device is configured to detect the (effective) oscillation of at least one measuring tube and convert it into at least one (electrical or optical) oscillation signal, such that the at least one oscillation signal has at least one (oscillation) effective component, i.e., a (signal) frequency corresponding to the instantaneous effective frequency and a spectral signal component depending on the phase angle of the mass flow rate of the analyte. Furthermore, in each case, the converter electronics of the Coriolis mass flow meter are also configured to receive and evaluate at least one oscillation signal, i.e., to determine one or more (mass flow rate) measurements, particularly quantized values ​​and / or digital values, representing the mass flow rate of the analyte, based, for example, on the phase angle of the effective components of at least one or more oscillation signals, such as based on the mass flow rate-related phase (angle) difference established between the effective components of two oscillation signals. Typically, the converter electronics of the Coriolis mass flow meter are also configured to determine (frequency) measurements, particularly quantized values ​​representing the aforementioned effective frequency, for example, for adjusting the excitation signal and / or for determining digital density measurements representing the density of the analyte. In order to generate an excitation signal, in each case, the mass flow converter electronics can have an electronic driver circuit electrically coupled to at least one oscillating exciter, which may be designed as a phase-locked loop (PLL).

[0004] The measurement systems disclosed in US-B 6311136, US-B 7406878, US-B 8671776, US-A 2021 / 0140804, WO-A 2004 / 072588, WO-A 2008 / 011587, WO-A 2011 / 068500, WO-A 2012 / 170020, WO-A 2021 / 154289, and WO-A 2023 / 200431 further include at least one or more (independent) pressure measuring devices having at least one pressure sensor and being connected in a pressure-transmitting manner to a corresponding (process) pipeline, i.e., connected to one of its pipeline sections, each of which is used to measure the static (operating) pressure established within the analyte flowing through the measurement system, and having a (pressure) converter electronics unit electrically connected to at least one pressure sensor. Each of at least one pressure mass flow meter is hydraulically connected, for example, to one of a first pipeline section and a second pipeline section or its cavity in such a manner that the pressure measuring device is held on the (pipe) wall section of the relevant pipeline section, and at least one of its pressure sensors is hydraulically connected to the cavity of the pipeline section through the (pipe) wall section of the pipeline section (forming a pressure pickup point).

[0005] In particular, as disclosed in US 6311136, US 7406878, US 2021 / 0140804, WO-A 2011 / 068500, WO-A 2012 / 170020, WO-A 2021 / 154289, and WO-A 2023 / 200431, the pressure sensor of the first pressure measuring device is capable of being connected to the first pipeline section in each case, and the pressure sensor of the second pressure measuring device—or, if the first pressure measuring device is configured as a differential pressure measuring device, the second pressure sensor of the first pressure measuring device—is capable of being connected to the second pipeline section in the manner described above. In particular, the aforementioned pressure measuring device can also be used to verify mass flow measurements performed using a Coriolis mass flow meter by appropriately taking into account the current operating pressure in the process pipeline, and / or to compensate for the effects of measuring static pressure that impairs the measurement accuracy of the mass flow value. In addition, in each case, one or more pressure measuring devices of the measuring system can also be used to monitor one or more static pressures established within the analyte to meet pre-specified limits, or to report exceeding one or more such limits as a corresponding fault of the analyte and / or the measuring system.

[0006] Further research on the type of measurement system discussed has shown that, despite conforming to the pre-specified (process) specifications for the measurement system or the (process) parameters acting thereon, the measurement accuracy of mass flow rate measurements can occasionally be significantly impaired, such that the measurement accuracy can vary significantly depending on one or more (process) parameters, namely, the mass flow rate and / or density and / or (operating) pressure of the substance being measured, and / or depending on the variation of one or more of these (process) parameters over time; in particular, this can be the case where acoustic resonances, as mentioned in US-B 10809109, occur in gaseous media, and gaseous inclusions occur in liquid media, as mentioned in US-B 6311136, are absent and can therefore be excluded as potential sources of error in each case, and / or such that, within various sub-ranges of the measurement range pre-specified for the measurement system, the corresponding ranges of the aforementioned (process) parameters, although the values ​​of the (process) parameters are (nominally) static or only slightly fluctuating, may occasionally exhibit significant impairment in measurement accuracy. Then it is no longer possible to easily eliminate temporary or transient measurement errors with an order exceeding 0.5% of the true measurement value. Summary of the Invention

[0007] Based on the prior art described above, one object of the present invention is to improve the measurement accuracy of the type of measurement system discussed, particularly the mass flow measurement, by utilizing its determined measurement accuracy, so that fluctuations in (process) parameters and / or faults that impair the measurement accuracy of the mass flow measurement can be detected early and reliably, and, if necessary, reported.

[0008] To achieve this objective, the present invention includes a method for operating a measurement system comprising a (process) pipeline, a Coriolis mass flow meter, and at least one (first) pressure measuring device, wherein the (process) pipeline is particularly designed as a conduit, the Coriolis mass flow meter is particularly independent and / or designed as a compact instrument, the Coriolis mass flow meter having at least one (first) measuring tube (fluidly) integrated into the stroke of the (process) pipeline, and the at least one (first) pressure measuring device is particularly independent and / or designed as a compact measuring device, the at least one (first) pressure measuring device having a pressure sensor connected (in a pressure transmission manner) to the (process) pipeline, wherein the measurement system includes at least one cavity of a first pipeline section of the (process) pipeline connected to the Coriolis mass flow meter at the inlet side, a cavity of at least one measuring tube of the Coriolis mass flow meter, and a cavity of a second pipeline section connected to the Coriolis mass flow meter at the outlet side, the method comprising: ● Causes the fluid sample to flow through the flow channel; ● The pressure measuring device is used to detect the time-varying (static) pressure (p1) of the fluid to be measured and to generate at least one (first) pressure signal, such as an electrical signal, which responds to the time-varying (first) pressure by utilizing at least one signal parameter, such as the time-varying voltage and / or current, in response to the time-varying (first) pressure. ● Excite the mechanical oscillation of the measuring tube (carrying the analyte) so that the measuring tube at least partially performs effective oscillation, i.e., an effective frequency around the static equilibrium position having, for example, a frequency greater than 50 Hz and / or less than 2000 Hz. The forced (bending) oscillation, i.e. the pre-specified (target) oscillation frequency, which, for example, corresponds to the mechanical resonant frequency of the measuring tube or the Coriolis mass flow meter thus formed, and / or depends on the viscosity and / or density of the substance to be measured, has, for example, a (target) oscillation frequency and a (target) oscillation amplitude. ● Capture the mechanical oscillation of the measuring tube to generate at least one (first) oscillation signal, in particular an electrical signal, representing the oscillation of at least one measuring tube, such that the at least one oscillation signal contains at least one (oscillation) effective component, i.e., a spectral signal component having a (signal) frequency corresponding to the (instantaneous) effective frequency, such that the (oscillation) effective component has a phase angle that depends on the mass flow rate of the substance to be measured. ● A periodic (pressure) change that causes at least temporary (for at least two oscillation cycles) of pressure in the analyte flowing through the flow channel, such that the change is, for example, undesirable and / or detrimental to the measurement accuracy of the measurement system, such that these (pressure) changes are at least partially periodic pressure oscillations, having, for example, a frequency corresponding to the effective frequency for two or more oscillation cycles. The frequency of pressure oscillations that are (positive) integer multiples of M The (pressure oscillation) frequency deviates from the effective frequency. The (positive) integer multiple M is less than the effective frequency For example, effective frequency 10% of (M=1), and such that the pressure signal (sD1) at least temporarily contains at least one (pressure) oscillation component, i.e., a (pressure oscillation-related) spectral signal component with a (signal) frequency corresponding to the (pressure oscillation) frequency, and (simultaneously) the oscillation signal contains at least one (pressure) interference component, i.e., a (pressure oscillation-related) spectral signal component with a (signal) frequency corresponding to the (pressure oscillation) frequency. ● Use at least one effective component of at least one (first) oscillation signal, for example based on the phase angle of the effective component of at least one (first) oscillation signal, to capture one or more (mass flow rate) measurements, such as quantized and / or digital values, and representing the mass flow rate of the fluid to be measured; ● And also uses the (first) pressure signal, such as at least the (pressure) oscillation component of the pressure signal, to detect and / or compensate for, for example, temporary malfunctions of the measurement system caused by periodic (pressure) changes in the (first) pressure, such as impairment of the measurement accuracy of the measurement system, i.e., the accuracy of one or more measurements in quantifying mass flow rate.

[0009] Furthermore, the present invention also includes a measurement system, for example configured to perform the method according to the invention, for measuring the mass flow rate of a fluid substance to be measured, such as a gas, liquid, or dispersion, the measurement system comprising: ● (Process) pipeline, which is specifically designed as a conduit; ● A Coriolis mass flow meter, such as a standalone Coriolis mass flow meter and / or a compact Coriolis mass flow meter, having at least one (first) measuring tube (fluidly) integrated into the stroke of a (process) pipeline, having an (electromechanical) actuator device, having a sensor device, and having (mass flow) converter electronics electrically connected to the actuator device and the sensor device. ● and at least one (first) pressure measuring device, such as a stand-alone pressure measuring device and / or a compact pressure measuring device and / or a differential pressure measuring device, having at least one pressure sensor connected (in a pressure transmission manner) to the (process) pipeline and having (pressure) converter electronics electrically connected to at least one pressure sensor; ● The flow channel of the measuring system for guiding the analyte is formed by the inner cavity of the first pipeline section of the (process) pipeline connected to the Coriolis mass flow meter at the inlet side, the inner cavity of at least one measuring tube of the Coriolis mass flow meter, and the inner cavity of the second pipeline section of the (process) pipeline connected to the Coriolis mass flow meter at the outlet side. ● In this embodiment, the (mass flow) converter electronics of the Coriolis mass flow meter are configured to generate an exciter signal (for the exciter device) to feed into the exciter device electrical (exciter) power, which is used to excite an effective oscillation, i.e., a forced mechanical (bending) oscillation of at least one measuring tube around a rest position with an effective frequency (set), for example greater than 50 Hz and / or less than 2000 Hz, i.e., a pre-specified (target) oscillation frequency, which corresponds, for example, to the mechanical resonant frequency of the measuring tube or the Coriolis mass flow meter formed therefrom, and / or depends on the viscosity and / or density of the measured medium, such that the excitation signal contains at least one effective component, i.e., an (AC) current component, which has an effective frequency (instantaneous or to be excited). The (alternating) frequency, for example, is the frequency corresponding to the effective frequency ( The (AC) frequency and the current intensity corresponding to the (target) oscillation amplitude; ● And therein, the exciter device is configured to convert the electrical power fed by the exciter signal into mechanical power (causing effective oscillation of at least one measuring tube); ● The sensor device is configured to detect (effective) oscillations of at least one measuring tube and convert them into at least one (e.g., electrical or optical) (first) oscillation signal, such that the at least one oscillation signal contains at least one (oscillation) effective component, namely a signal frequency having a signal frequency corresponding to the (instantaneous) effective frequency and a spectral signal component having a phase angle depending on the mass flow rate of the substance to be measured. ● And therein, the (mass flow) converter electronics of the Coriolis mass flow meter are configured to receive and evaluate at least one oscillation signal, that is, to determine one or more (mass flow) measurements representing the mass flow of the fluid to be measured, such as quantized values ​​and / or digital values, based on the phase angle of the effective component of at least one (first) oscillation signal, and to determine one or more (frequency) measurements representing the effective frequency, such as quantized values. ● The pressure sensor is configured to detect the time-varying (static) pressure of the analyte flowing (in the flow channel) and convert it into at least one (first) pressure signal, such as an electrical signal, which utilizes at least one signal parameter, particularly the time-varying voltage and / or current, in response to the time-varying (first) pressure. ● And wherein, the (pressure) converter electronics of the pressure measuring device are configured to monitor pressure and / or monitor periodic (pressure) changes in said pressure and / or detect (e.g., temporary) malfunctions of the measuring system caused by periodic (pressure) changes in said pressure, such as impairment of the measurement accuracy of the Coriolis mass flow meter or measuring system, i.e., one or more (mass flow) measurements using their accuracy in quantifying mass flow, receiving and evaluating at least one pressure signal, i.e., determining the (first) pressure in the analyte flowing through the flow channel based on the pressure signal, for example, whether or to what extent a periodic (pressure) change is present for at least two or more oscillation cycles of effective oscillation, such that the (pressure) change is, for example, undesirable and / or impairs the measurement accuracy of the Coriolis mass flow meter or measuring system, such that the (pressure) change is at least partially a periodic pressure oscillation, such that the periodic pressure oscillation has a (pressure oscillation) frequency for two or more oscillation cycles ( The (pressure oscillation) frequency corresponds, for example, to a (positive) integer multiple M of the effective frequency, which deviates from the effective frequency, for example, the effective frequency. (M=1) positive integer multiples of M( ), effective frequency 10%, for example, determining whether the pressure signal at least temporarily contains at least one (pressure) oscillation component (d1M), i.e., has a frequency corresponding to the (pressure oscillation) frequency. The (signal) frequency (pressure oscillation related) spectrum signal component.

[0010] According to a first embodiment of the method of the present invention, pressure oscillations with an amplitude greater than 1 mbar, for example greater than 10 mbar, are also provided.

[0011] According to a second embodiment of the method of the invention, an effective frequency corresponding to the (instantaneous) resonant frequency of the measuring tube is also provided, in particular the resonant frequency of the natural bending oscillation mode inherent in or formed by the Coriolis mass flowmeter in the measuring tube, wherein at least one measuring tube is capable of performing or actually performing bending oscillations around a static equilibrium position.

[0012] According to a third embodiment of the method of the present invention, the effective frequency also depends on the (instantaneous) density of the analyte guided in at least one measuring tube.

[0013] According to a fourth embodiment of the method of the present invention, the detection and / or compensation of faults in the measurement system is also provided, including monitoring pressure and / or periodic (pressure) changes based on a (first) pressure signal, for example, at least a (pressure) oscillation component of the pressure signal.

[0014] A fifth embodiment of the method according to the invention further provides that the mechanical oscillation of the capturing measuring tube also generates at least one second, for example, electrical oscillation signal representing the oscillation of at least one measuring tube, such that the second oscillation signal contains at least one (oscillation) effective component, i.e., a spectral signal component having a signal frequency corresponding to the (instantaneous) effective frequency, such that the (oscillation) effective component of the second oscillation signal has a phase angle depending on the mass flow rate of the material to be measured, for example, such that a phase difference depending on the mass flow rate, i.e., the difference between the phase angles of the effective components of the first and second oscillation signals, is established between the (oscillation) effective components of the first and second oscillation signals. Further developing this embodiment of the invention, it also provides that one or more mass flow rate measurements are determined using the effective component of the second oscillation signal (e.g., its phase angle), for example based on the difference between the phase angles of the effective components of the first and second oscillation signals.

[0015] A sixth embodiment of the method according to the invention provides the use of a pressure signal, including determining a (pre-specified) frequency band for the pressure signal containing the (pressure oscillation) frequency and / or a power density spectrum for the (pressure) oscillation component. In this development of the invention, detecting a fault in the measurement system is also provided, comprising comparing the determined power density spectrum of the (pressure signal) frequency band with a (power density spectrum) threshold pre-specified for it, the value representing a pre-specified fault in the measurement system, for example, classified as unacceptable or critical.

[0016] A seventh embodiment of the method according to the invention also provides the use of a pressure signal to determine the spectral power density of at least one (pressure) oscillating component of the pressure signal. In a further development of this embodiment of the invention, detecting a fault in the measurement system is also provided, comprising comparing the spectral power density of the (pressure) oscillating component of the pressure signal with a pre-specified (power density) threshold, which indicates a pre-specified fault in the measurement system, for example, classified as unacceptable or critical.

[0017] An eighth embodiment of the method according to the invention also provides an opening that causes the flow of the substance to be measured, including the use of a (delivery) pump connected to the pipeline and / or a valve inserted into the pipeline.

[0018] A ninth embodiment of the method according to the invention also provides the use of a pressure signal, including determining the signal amplitude of the (pressure) oscillating component of the pressure signal. In a further development of this embodiment of the invention, detecting a fault in the measurement system is also provided, comprising comparing the signal amplitude of the (pressure) oscillating component of the pressure signal with a pre-specified (amplitude) threshold value, which indicates a pre-specified fault in the measurement system, for example, classified as unacceptable or critical.

[0019] According to a tenth embodiment of the method of the present invention, the (pressure oscillation) frequency corresponds to the effective frequency (M=1). However, the (pressure oscillation) frequency can also correspond to, for example, twice the effective frequency (M=2).

[0020] According to an eleventh embodiment of the method of the present invention, achieving (pressure) changes also includes using a pump, for example changing the pump's delivery rate, and / or using a valve, for example changing the valve position.

[0021] According to a twelfth embodiment of the method of the invention, the (pressure) change is at least partially caused by effective oscillation of at least one measuring tube.

[0022] According to a thirteenth embodiment of the method of the invention, a Coriolis mass flow meter is also provided having an (electromechanical) exciter device, which is formed, for example, by at least one electrodynamic oscillation exciter, for converting electrical power into mechanical power, such as effective oscillation, which can be used to excite and maintain (forced) mechanical oscillation of at least one measuring tube, and the excitation of the mechanical oscillation of the measuring tube includes generating an electrical excitation signal such that the excitation signal contains at least one effective component, namely an (alternating) current component, having an (alternating) frequency corresponding to the (instantaneous or to be excited) effective frequency, for example, such that a (phase) difference of not less than 0.1° and / or not more than 10° is established between the phase angle of the effective component of the excitation signal and the (pressure) oscillation component of the pressure signal.

[0023] According to a fourteenth embodiment of the method of the present invention, a (first) pressure measuring device is also provided, for example, hydraulically connected to a first pipeline section or its cavity of a (process) pipeline, particularly such that the pressure measuring device is mounted on a (pipe) wall section of the first pipeline section and / or such that the pressure measuring device is (hydraulically) connected to the cavity of the first pipeline section of the (process) pipeline through a (pipe) wall section of the first pipeline section (forming a pressure pickup point). In a further development of this embodiment of the invention, a first pressure measuring device for detecting a first pressure is hydraulically connected to the inner cavity of a first pipeline section of a process pipeline via a pipe wall section forming a first pressure pickup point. Specifically, the first pressure pickup point is formed at a distance from the center of at least one measuring tube, the distance being not less than 120% and / or not more than 200% of the oscillation length of the at least one measuring tube, wherein the oscillation length corresponds to the free length of the tube between the two widest points of effective oscillation, and / or the first pressure pickup point is formed at a distance from the center of at least one measuring tube, the distance being not less than 0.25 times and / or not more than 0.5 times the acoustic wavelength of the calibration fluid at its lowest and / or most effective resonant frequency, wherein the calibration fluid is distilled water with a fluid temperature of 25°C. (First) Pressure can be advantageously obtained, for example (using a first pressure measuring device), at a distance from the center of at least one measuring tube, the distance being not less than 120% and / or not more than 200% of the oscillation length of the at least one measuring tube, the distance corresponding to the (free) length of the tube between the two widest separated nodes of the effective oscillation, and / or at a distance from the center of at least one measuring tube, the distance being not less than 0.25 times and / or not more than 0.5 times the (acoustic) wavelength of the calibration fluid at the (lowest and / or usable as an effective frequency) resonant frequency of the measuring tube fully filled with calibration fluid, wherein the calibration fluid is (distilled) water having a (fluid) temperature of 25°C. However, alternatively, the pressure measuring device is hydraulically connected, for example, to a second section of the (process) pipeline or its interior, such that the pressure measuring device is mounted on a section of the (pipe) wall of the second pipeline section and / or the pressure measuring device is (hydraulically) connected to the interior of the second section of the (process) pipeline through a section of the (pipe) wall of the second pipeline section (forming a pressure pickup point).

[0024] According to a fifteenth embodiment of the method of the invention, achieving at least temporary periodic (pressure) changes in the (first) pressure of the analyte flowing through the flow channel includes forming a standing wave (acoustic) wave within the analyte, particularly such that the standing wave is formed at least partially within at least one measuring tube and / or at least one of a first and a second pipeline section of a (process) pipeline.

[0025] According to a sixteenth embodiment of the method of the invention, using a pressure signal is further provided by converting the pressure signal into a digital pressure signal. In a further development of this embodiment of the invention, using the pressure signal is also provided by applying a digital filter to the digital pressure signal, the filter being, for example, adapted relative to the z-transfer function and / or configured as a bandpass filter and / or having a bandwidth of less than 100 Hz and / or having a bandwidth of less than 10% of the effective frequency, such that a digital output signal approximating the (pressure) oscillating component of the pressure signal is provided at the output of the digital filter.

[0026] A seventeenth embodiment of the method according to the invention also provides the use of a pressure signal, including converting the pressure signal into a digital pressure signal, and applying a digital filter to the digital pressure signal. This filter, for example, is adaptable to the z-transfer function and / or configured as a bandpass filter and / or has a bandwidth of less than 100 Hz and / or a bandwidth of less than 10% of the effective frequency, such that a digital output signal approximating the (pressure) oscillating component of the pressure signal is provided at the output of the digital filter. Further developing this embodiment of the invention, it also provides the use of the output signal of the digital filter to generate a (warning) message and / or adjust the z-transfer function of the digital filter, such as the center frequency and / or the bandwidth of the digital filter, taking into account the effective frequency, for example, such that the center frequency of the digital filter is set to 1 times the effective frequency (M = 1), and / or the bandwidth of the digital filter is set or correspondingly maintained at less than 10% of the effective frequency. The z-transfer function of the digital filter is set. For example, calculating the center frequency and / or bandwidth of a digital filter can be accomplished, for instance, using one or more (digital) effective frequency measurements determined by a Coriolis mass flow meter and / or using one or more (digital) density measurements determined by a Coriolis mass flow meter.

[0027] An eighteenth embodiment of the method according to the invention also provides the use of a pressure signal, including a conversion from a pressure signal to a digital pressure signal, and the application of a digital filter to both the pressure signal and the digital pressure signal. This digital filter may, for example, be adapted relative to the z-transfer function and / or designed as a bandpass filter and / or have a bandwidth of less than 100 Hz and / or a frequency less than the effective frequency. It has 10% bandwidth and provides a digital output signal that approximates the pressure oscillation component, and uses the output signal of the digital filter to detect faults in the measurement system and / or compensate for faults in the measurement system.

[0028] A nineteenth embodiment of the method according to the invention also provides the use of an oscillating signal, including converting the oscillating signal into a digital oscillating signal.

[0029] According to a twentieth embodiment of the method of the present invention, a Coriolis mass flow meter is also provided having a (mass flow) converter electronics unit, which is, for example, housed in an electronics housing of the Coriolis mass flow meter.

[0030] According to a twenty-first embodiment of the method of the present invention, a pressure measuring device is also provided having a (pressure) converter electronics unit, which is, for example, housed in an electronics housing of the pressure measuring device.

[0031] According to a twenty-second embodiment of the method of the invention, a Coriolis mass flow meter is also provided having a (mass flow) converter electronics unit, which is, for example, housed in an electronics housing of the Coriolis mass flow meter, and a pressure measuring device has a (pressure) converter electronics unit, which is, for example, housed in an electronics housing of the pressure measuring device. The (mass flow) converter electronics unit of the Coriolis mass flow meter and the (pressure) converter electronics unit of the pressure measuring device transmit and / or receive (measurement and / or operation) data via a common communication channel, which is formed, for example, by a data line and / or by a radio connection, such as by a fieldbus and / or by (industrial) Ethernet and / or by an I / O link and / or by wireless HART and / or by ZigBee and / or by Bluetooth. The data channel can be advantageously used, in particular, to transmit one or more (digital) effective frequency values ​​and / or one or more (digital) density measurements determined by the Coriolis mass flow meter to the pressure measuring device.

[0032] According to a twenty-third embodiment of the method of the invention, a Coriolis mass flow meter is also provided having at least one second measuring tube (fluidly) integrated into the stroke of the (pipeline), which is connected (fluidly) in parallel with, for example, a first measuring tube, such that the interior of the second measuring tube of the Coriolis mass flow meter involves a flow channel. Further developing this embodiment of the invention, the analyte flowing through the flow channel is also provided to cause the analyte to flow through the second measuring tube, for example, causing the analyte to flow through both the first and second measuring tubes simultaneously. Furthermore, the Coriolis mass flow meter can advantageously have a first splitter and a second splitter, the first splitter being fluidly connected to the first and second measuring tubes, each acting as a pipe branch at a first tube end, and the second splitter being fluidly connected to the first and second measuring tubes, each acting as a pipe joint at a second tube end, and can accordingly include causing the analyte to flow through the flow channel by causing the analyte to flow through the first and second splitters, for example, causing the analyte to flow through both the first and second measuring tubes and the first and second splitters simultaneously.

[0033] According to a first development of the method of the invention, the method further includes determining if the measurement accuracy of the measurement system is impaired and / or if the (pressure oscillation) frequency is unacceptable. With effective frequency The difference in integer multiples is less than the effective frequency. If 10% of the data is negative, a (warning) message will be issued, which may be declared as an alert.

[0034] According to a second development of the method of the invention, the method further includes using a pressure signal, for example, at least a (pressure) oscillating component of a pressure signal, to monitor pressure and / or periodic (pressure) changes.

[0035] According to a third development of the method of the invention, the method further includes transmitting the (instantaneous) operating frequency from the Coriolis mass flow meter to a pressure measuring device, for example, to monitor pressure and / or periodic (pressure) changes or to detect (pressure) oscillating components of the pressure signal.

[0036] According to a fourth development of the method of the invention, the method further includes using at least one oscillating signal, for example, an effective component, to generate one or more (density) measurements, such as digital (density) measurements, which represent the density of the substance to be measured, for example, such that one or more (density) measurements depend on the effective frequency.

[0037] According to a fifth development of the method of the present invention, the method further includes generating a quantized effective frequency by a Coriolis mass flow meter. One or more digital (effective frequency) values. Additionally, one or more density measurements can be transmitted to the pressure measuring device, for example, via a communication channel between the pressure measuring device and the Coriolis mass flow meter, formed by a fieldbus and / or by (industrial) Ethernet and / or by an IO link and / or by wireless HART and / or by ZigBee and / or by Bluetooth.

[0038] According to a sixth development of the method of the invention, the measurement system includes a second pressure measuring device connected to the (process) pipeline, for example, a stand-alone and / or designed as a compact device, and the method further includes using the second pressure measuring device to detect a time-varying (static) second pressure of the fluid to be measured, and generating at least one (e.g., electrical) second pressure signal that utilizes at least one signal parameter, for example, a time-varying change in voltage and / or current, in response to a time-varying change in the second pressure, and, for example, for at least two oscillation cycles of an effective oscillation, causes at least temporary and / or simultaneous (pressure) changes in the (static) second pressure in the fluid to be measured flowing through the flow channel, such that these (pressure) changes are at least partially periodic pressure oscillations, such that the periodic pressure oscillations are, for example, time-equal to the pressure oscillations of the first pressure and exhibit a (pressure oscillation) frequency corresponding to the effective frequency and / or (pressure oscillation) frequency of the pressure oscillations of the first pressure, and the pressure signal at least temporarily has at least one (pressure) oscillation component, i.e., a (pressure oscillation-related) spectral signal component, which has a frequency f corresponding to the (pressure oscillation) frequency. p2 The (signal) frequency. The second pressure signal, especially its (pressure) oscillation component, can also be advantageously used to detect and / or compensate for faults in the measurement system. The second pressure measuring device can, for example, be hydraulically connected to a second section of the (process) pipeline or its interior, such that the pressure measuring device is held on the (pipe) wall section of the second pipeline section and / or (hydraulically) connected to the interior of the second section of the (process) pipeline through the (pipe) wall section.

[0039] According to a first embodiment of the measurement system of the present invention, in the event of a fault in the measurement system caused by a periodic (pressure) change in pressure, the converter electronics of the pressure measuring device is configured to output a warning message that signals the situation, for example, transmitting the message to the converter electronics of the Coriolis mass flow meter.

[0040] According to a second embodiment of the measurement system of the present invention, a converter electronics of a Coriolis mass flow meter is also provided to output determined (digital) measurements, such as mass flow measurements and / or frequency measurements, to transmit them, for example, to a converter electronics of a pressure measuring device.

[0041] According to a third embodiment of the measurement system of the present invention, a converter electronics of a Coriolis mass flow meter is also provided to transmit one or more frequency measurement values ​​to a converter electronics of a pressure measuring device, and the converter electronics of the pressure measuring device is configured to receive and process the frequency measurement values ​​transmitted by the converter electronics of the Coriolis mass flow meter, for example, to evaluate at least one pressure signal and / or detect (due to periodic pressure changes) a fault in the measurement system, while taking into account one or more of the (received) frequency measurement values.

[0042] According to a fourth embodiment of the measurement system of the present invention, a pressure sensor of the first pressure measuring device is also provided, for example, hydraulically connected to a first section of the (process) pipeline.

[0043] According to a fifth embodiment of the measurement system of the present invention, the converter electronics of the Coriolis mass flow meter are also provided to determine one or more (density) measurements, such as quantized and / or digital values, representing the density of the fluid to be measured, based on at least one oscillation signal, for example, using one or more frequency measurements.

[0044] According to a sixth embodiment of the measurement system of the present invention, a sensor device is also provided having at least one first oscillation sensor, such as an electrodynamic sensor, effective for generating a first oscillation signal. In a further development of the embodiments of the invention, the sensor device includes at least one second oscillation sensor, which is, for example, electrically powered and / or structurally identical to the first oscillation sensor, and is used to generate the second oscillation signal.

[0045] According to a seventh embodiment of the measurement system of the present invention, the converter electronics of the Coriolis mass flow meter and the converter electronics of the pressure measuring device are coupled to each other in a signal transmission manner to form a common digital communication channel, for example, formed by data lines and / or by radio connections, and are configured to transmit (measurement and / or operation) data, such as (digital) measured values, to each other via the communication channel, for example, one or more (warning) messages notifying the measurement system of a fault caused by periodic (pressure) changes in pressure (p). In a further development of this embodiment of the invention, the communication channel is also provided to be formed by a fieldbus and / or by (industrial) Ethernet and / or by an I / O link and / or by WirelessHART and / or by ZigBee and / or by Bluetooth.

[0046] An eighth embodiment of the measurement system according to the invention also provides a first pressure measuring device having a second pressure sensor (hydraulically) connected to a (process) pipeline, for example, a second pipeline section connected to the (process) pipeline. In a further development of this embodiment of the invention, the second pressure sensor is also provided to be electrically connected to a (pressure) converter electronics of the first pressure measuring device.

[0047] According to the development of the measurement system of the present invention, the system further includes: a second pressure measuring device connected to a (process) pipeline, for example, a stand-alone and / or designed as a compact device and / or structurally identical to the first pressure measuring device, the second pressure measuring device having a pressure sensor connected (in a pressure transmission manner) to the (process) pipeline and having (pressure) converter electronics electrically connected thereto. Attached Figure Description

[0048] The invention and its advantageous embodiments are explained in more detail below based on exemplary embodiments shown in the accompanying drawings. Components with the same or the same function or purpose have the same reference numerals in all the drawings; for clarity or if it seems reasonable for other reasons, the aforementioned reference numerals are omitted in the following drawings. Furthermore, other advantageous embodiments or developments, especially combinations of certain aspects of the invention initially explained individually, arise from the figures and / or the claims themselves.

[0049] Figure 1 An exemplary embodiment of a measurement system for measuring the mass flow rate of a flowing fluid (e.g., gas, liquid, or dispersion) is schematically shown. Detailed Implementation

[0050] The measurement system includes a (process) pipeline and a Coriolis mass flow meter M1. The (process) pipeline is designed, for example, as a conduit. The Coriolis mass flow meter M1 has at least one (first) measuring tube fluidly integrated into the stroke of the (process) pipeline, an (electromechanical) actuator device, a sensor device, and (mass flow) converter electronics electrically connected to both the actuator device and the sensor device. Furthermore, the measurement system includes at least one (first) pressure measuring device P1, which has at least one pressure sensor connected (in a pressure transmission manner) to the (process) pipeline and has (pressure) converter electronics electrically connected to the at least one pressure sensor. The Coriolis mass flow meter can be designed, for example, as a stand-alone Coriolis mass flow meter and / or a compact Coriolis mass flow meter. Similarly, the pressure measuring device can also be, for example, a stand-alone pressure measuring device and / or a compact pressure measuring device. Alternatively or additionally, the pressure measuring device can be a (stand-alone) differential pressure measuring device. The Coriolis mass flow meter has (mass flow) converter electronics, for example, housed in an electronics housing of the Coriolis mass flow meter, and the pressure measuring device has (pressure) converter electronics, which are specifically housed in an electronics housing of the pressure measuring device. According to other embodiments of the invention, the (mass flow) converter electronics of the Coriolis mass flow meter and the (pressure) converter electronics of the pressure measuring device are capable of transmitting and / or receiving (measurement and / or operation) data via, for example, a common communication channel formed by data lines and / or radio connections, such as a communication channel formed by a fieldbus and / or by (industrial) Ethernet and / or IO links and / or wireless HART and / or ZigBee and / or Bluetooth.

[0051] In the measurement system according to the invention, the flow channel of the measurement system for guiding the analyte is formed by the inner cavity of a first pipeline section connected to the Coriolis mass flow meter at the inlet side, the inner cavity of at least one measuring tube of the Coriolis mass flow meter, and the inner cavity of a second pipeline section connected to the Coriolis mass flow meter at the outlet side, wherein the analyte flows through the flow channel, for example, in the preferred (main) flow direction, during operation of the measurement system.

[0052] The (mass flow) converter electronics of the Coriolis mass flow meter are also configured to generate an exciter signal (for the exciter device) to be fed into the exciter device electrical (exciter) power for exciting effective oscillations, i.e., forced mechanical (bending) oscillations of at least one measuring tube around a rest position having a (set) effective frequency, i.e., a predetermined (target) oscillation frequency, such that the exciter signal contains at least one effective component e1N, i.e., an (alternating) current component, which has a frequency corresponding to the (instantaneous or to be excited) effective frequency. The (alternating) frequency, especially corresponding to the effective frequency ( The (AC) frequency of the oscillation and the current intensity corresponding to the (target) oscillation amplitude. The (target) oscillation or effective frequency can typically be greater than 50 Hz and / or less than 2000 Hz, and / or, as is typical for measurement systems of the type discussed, can correspond to the mechanical resonant frequency of the measuring tube or the Coriolis mass flow meter formed thereusing it, and thus can depend on the viscosity and / or density of the substance to be measured (that causes it to flow through the flow channel). Flowing the substance to be measured can, for example, involve using a (delivery) pump K1 connected to the pipeline and / or opening a valve V1 inserted into the pipeline.

[0053] In each case, the exciter device is configured to convert the electrical power fed by the excitation signal into mechanical power (causing effective oscillation of at least one measuring tube), and the sensor device is configured to detect the (effective) oscillations of at least one measuring tube and convert them into at least one (e.g., electrical or optical) (first) oscillation signal (s1), such that the at least one oscillation signal s1 has at least one (oscillating) effective component s1N, i.e., has a frequency corresponding to the instantaneous effective frequency. The signal frequency and spectral signal components depend on the phase angle of the mass flow rate of the substance being measured. Furthermore, the (mass flow rate) converter electronics of the Coriolis mass flow meter are configured to receive and evaluate at least one oscillating signal, i.e., to determine one or more (mass flow rate) measurements, such as quantized and / or digital values, representing the mass flow rate of the flowing substance being measured, based, for example, on the phase angle of the effective component of at least one (first) oscillating signal, and to determine one or more (frequency) measurements, such as quantized measurements, representing the effective frequency.

[0054] The pressure sensor of the pressure measuring device is then used to detect the time-varying (static) pressure p1 of the analyte flowing (in the flow channel) and convert it into at least one, for example, electrical, (first) pressure signal d1, which responds to the time-varying (first) pressure p1 by utilizing the time-varying (variable) of at least one signal parameter (such as voltage and / or current). Specifically, the pressure signal d1 is made to have, or at least temporarily have, one or more spectral signal components, each spectral signal component having a frequency corresponding to the time-varying (signal) frequency of the pressure p1.

[0055] As already mentioned, various external malfunctions can affect the measurement system during operation, significantly impairing its measurement accuracy, especially when used to determine mass flow rate measurements; this is particularly true when the degree of change or rate of change of one or more (process) parameters over time can temporarily cause an increase in measurement error, which may be excessive. Changes in the pressure p1 of the analyte flowing through the flow channel have also proven particularly detrimental to measurement accuracy—at least temporarily—especially periodic changes, specifically for two or more cycles of effective oscillation—and furthermore, for two or more oscillation cycles with a (pressure oscillation) frequency. This frequency Deviation from effective frequency (positive) integer multiples M ( ), especially the effective frequency It itself (M=1) is less than the effective frequency. 10% ), for example, corresponding to the effective frequency (positive) integer multiples M ( This is not only because the pressure signal sD1 correspondingly exhibits at least one (pressure) oscillation component d1M, i.e., a (pressure oscillation-related) spectral signal component, which has a frequency corresponding to the (pressure oscillation) frequency. The (signal) frequency, and also because the oscillation signal s1 can at least temporarily contain at least one corresponding (pressure) interference component s1M, i.e., a (pressure oscillation related) spectral signal component, which also has a corresponding (pressure oscillation) frequency. The (signal) frequency. Pressure oscillations can typically have amplitudes greater than 1 mbar, particularly greater than 10 mbar. As a result, the effective (oscillation) component s1N can have a superimposed (substantially of the same frequency) interference component, which depends on the pressure or its pressure oscillations, and occasionally causes increased or unacceptably large measurement errors. The aforementioned (pressure) changes, especially those that cause the (pressure) interference component s1M, can be caused, in particular, by one or more pumps and / or valves integrated into the (process) pipeline, for example, by changing the delivery rate of at least one pump and / or changing the position of at least one valve, or due to related changes in the acoustic (flow) impedance of the pipe L. Furthermore, the (pressure) changes can at least temporarily include periodic changes in the pressure p1 in the analyte flowing through the flow channel, the formation of standing waves (acoustic) waves within the flowing material, or caused by such (acoustic) waves; this also, for example, causes the aforementioned standing waves to be formed at least partially within at least one measuring tube and / or within at least one of the first and second pipeline sections of the (process) pipeline.

[0056] To monitor pressure p1 and / or monitor periodic (pressure) changes in pressure p and / or detect malfunctions, particularly temporary malfunctions, of the measurement system caused by periodic (pressure) changes in pressure p1, and especially for the purpose of timely detection of any impairment to the (measurement) accuracy achievable for mass flow rates or to mitigate the risk of erroneous measurements due to the aforementioned type of (pressure) changes, the (pressure) converter electronics of the pressure measuring device are also configured to receive and evaluate at least one pressure signal, i.e., to determine, based on the pressure signal, whether and to what extent pressure p1 (established in the analyte flowing through the flow channel) has the aforementioned periodic pressure oscillations, which have a (pressure oscillation) frequency for two or more oscillation cycles. ( To this end, the (pressure) converter electronics are also configured to determine, based on the pressure signal, whether the pressure signal sD1 at least temporarily contains at least one (pressure) oscillation component d1M, i.e., has a (pressure oscillation) frequency. The spectral signal components (dependent on the pressure oscillations), especially the investigation or determination of the (pressure oscillation) frequency. Does it correspond to the effective frequency? (M=1) and / or investigate or determine the (pressure oscillation) frequency. Does it correspond to the effective frequency? The pressure (p1) and / or periodic (pressure) changes are monitored by using twice the pressure (M=2) and / or subsequently using the (pressure) oscillation component (d1M) of the pressure signal. According to other embodiments of the invention, for this purpose, the (instantaneous) operating frequency... Transmission from Coriolis mass flow meters to pressure measuring devices is repeated, for example, in a time- and / or event-controlled manner, particularly regularly or in real time.

[0057] According to other embodiments of the invention, the (pressure) converter electronics are also designed or configured to issue a (warning) message Err_p (also proclaimed as an alarm) if (based on the foregoing evaluation of the pressure signal sD1) an impairment of the measurement accuracy of the measurement system classified as unacceptable is detected, and / or the (pressure oscillation) frequency... Deviation from effective frequency The integer multiple M is less than the operating frequency 10%, corresponding to, for example, operating frequency (M=1) or, for example, corresponding to the operating frequency Twice (M=2).

[0058] According to other embodiments of the invention, a pressure signal is used, or the (pressure) converter electronics are configured to determine the signal amplitude Xp@M of the (pressure) oscillation component of the pressure signal, for example, by comparing the signal amplitude of the (pressure) oscillation component of the pressure signal with a (amplitude) threshold pre-specified for this purpose to detect a fault in the measurement system (due to periodic variations in pressure p1), which is, for example, classified as unacceptable or critical, wherein the (amplitude) threshold corresponds to or represents the minimum signal amplitude of the oscillation component that causes the fault in the measurement system. According to another embodiment of the invention, the pressure signal can also be used for this purpose, or the (pressure) converter electronics can also be configured to determine a frequency containing the (pressure oscillation) frequency. The power density spectrum of the pressure signal in the (pre-specified) frequency band of the (pressure signal), or the determination of the (pressure) oscillation component d1M, and / or the pressure signal can be used for this purpose, or the (pressure) converter electronics can be configured to determine the spectral power density of at least the (pressure) oscillation component of the pressure signal. Detecting a fault in the measurement system can then also include comparing the determined power density spectrum with a pre-specified (power density spectrum) threshold for this purpose, which represents, for example, a pre-specified fault of the measurement system classified as unacceptable or critical, or comparing the spectral power density of the (pressure) oscillation component of the pressure signal with a pre-specified (power density spectrum) threshold for this purpose, which represents, for example, a pre-specified fault of the measurement system classified as unacceptable or critical. Detecting and / or compensating for faults in the measurement system can accordingly include monitoring pressure p1 and / or the periodic (pressure) changes of pressure p1 based on the (first) pressure signal d1, particularly at least the (pressure) oscillation component d1M of the pressure signal d1.

Claims

1. A method for operating a measurement system comprising a (process) pipeline, a Coriolis mass flow meter, and at least one (first) pressure measuring device (P1), wherein the (process) pipeline is particularly designed as a conduit, the Coriolis mass flow meter is particularly independent and / or designed as a compact instrument, the Coriolis mass flow meter having at least one (first) measuring tube (fluidly) integrated into the stroke of the (process) pipeline, the at least one (first) pressure measuring device (P1) is particularly independent and / or designed as a compact measuring device, the at least one (first) pressure measuring device (P1) having a pressure sensor (in a pressure transmission manner) connected to the (process) pipeline (L), wherein, The measurement system includes at least one cavity of a first pipeline section of the (process) pipeline connected at the inlet side to the Coriolis mass flow meter, a cavity of the at least one measuring tube of the Coriolis mass flow meter (M1), and a cavity of a second pipeline section connected at the outlet side to the Coriolis mass flow meter (M1), the method comprising: - Causes the fluid sample to flow through the flow channel; - Using the pressure measuring device (P1) -- Detecting the time-varying (static) pressure (p1) of the fluid to be measured. -- and generate at least one, particularly electrical (first) pressure signal (d1), said at least one (first) pressure signal (d1) responding to the time-varying nature of said (first) pressure (p1) using at least one signal parameter, particularly the time-varying nature of voltage and / or current. ); - Excite the mechanical oscillation of the measuring tube (carrying the analyte) such that the measuring tube at least partially performs effective oscillation, i.e., an effective frequency around a static equilibrium position having a frequency particularly greater than 50 Hz and / or less than 2000 Hz. The forced (bending) oscillation, i.e., the pre-specified (target) oscillation frequency, specifically corresponding to the mechanical resonant frequency of the measuring tube or the Coriolis mass flow meter formed therefrom, and / or depending on the viscosity and / or density of the substance to be measured, specifically having a (target) oscillation frequency and a (target) oscillation amplitude. - Detect the mechanical oscillation of the measuring tube to generate at least one (first) oscillation signal (s1), particularly an electrical signal, representing the oscillation of the at least one measuring tube, such that the at least one oscillation signal (s1) contains at least one (oscillation) effective component (s1N), i.e., has a frequency corresponding to the (instantaneous) effective frequency. The spectral signal components of the (signal) frequency, such that the (oscillation) effective component (s1N) has a phase angle that depends on the mass flow rate of the substance to be measured; - In particular, for at least two oscillation cycles of the effective oscillation, the at least temporary (pressure) change in the (first) pressure (p1) in the analyte flowing through the flow channel is periodic, which is particularly undesirable and / or impairs the measurement accuracy of the measurement system, making... -- The pressure change is at least partially a periodic pressure oscillation, the pressure change having a pressure oscillation frequency over two or more oscillation periods. ( The frequency Deviation from the effective frequency (positive) integer multiples M ( ), especially the effective frequency (M=1), less than the effective frequency. 10%, particularly corresponding to the effective frequency. (positive) integer multiples of M, -- and make --- The pressure signal (d1) at least temporarily contains at least one (pressure) oscillation component (d1M), i.e., has a frequency corresponding to the (pressure oscillation) frequency. The frequency (pressure oscillation related) spectrum signal components of the (signal) frequency. --- And (simultaneously) the oscillation signal (s1) contains at least one (pressure) interference component (s1M), i.e., has a frequency corresponding to the (pressure oscillation) frequency. The (signal) frequency (pressure oscillation related) spectrum signal component; - Using at least the effective component of the at least one (first) oscillation signal, particularly based on the phase angle of the effective component (s1N) of the at least one (first) oscillation signal, one or more (mass flow rate) measurements are determined, the one or more (mass flow rate) measurements being in particular quantized values ​​and / or digital values, and representing the mass flow rate (m) of the fluid to be measured; - And also using the (first) pressure signal (d1), in particular at least the (pressure) oscillation component (d1M) of the pressure signal (d1), to detect and / or compensate for, in particular, temporary malfunctions of the measurement system caused by periodic (pressure) changes in the (first) pressure (p1), in particular, impairment of the measurement accuracy of the measurement system, i.e., the accuracy by which the one or more measurements quantify the mass flow rate.

2. The method according to any one of the preceding claims, wherein, The pressure oscillation has an amplitude greater than 1 mbar, particularly greater than 10 mbar.

3. The method according to any one of the preceding claims, - Wherein, the effective frequency corresponds to the (instantaneous) resonant frequency of the measuring tube, particularly the resonant frequency of the natural bending oscillation mode inherent in the measuring tube or the Coriolis mass flow meter formed therein, wherein, The at least one measuring tube is capable of performing or executing bending oscillations around a static equilibrium position; and / or - Wherein, the effective frequency depends on the (instantaneous) density of the analyte guided in at least one measuring tube.

4. The method according to any one of the preceding claims, wherein, The detection of the mechanical oscillation of the measuring tube further includes generating at least one second, particularly electrical, oscillation signal (s1) representing the oscillation of the at least one measuring tube, such that the second oscillation signal (s2) contains at least one (oscillation) effective component (s2N), i.e., has a frequency corresponding to the (instantaneous) effective frequency. The spectral signal components of the signal frequency, such that the (oscillation) effective component (s2N) of the second oscillation signal (s2) has a phase angle that depends on the mass flow rate of the material to be measured, and in particular, such that the phase difference depending on the mass flow rate, i.e. the difference between the phase angles of the effective components of the first oscillation signal and the second oscillation signal, is established between the (oscillation) effective components of the first oscillation signal and the second oscillation signal.

5. The method according to the preceding claim further comprises: One or more of the mass flow rate measurements are determined using the effective components of the second oscillation signal, particularly based on the phase angle of the effective components of the second oscillation signal and / or based on the difference between the phase angles of the effective components of the first oscillation signal and the second oscillation signal.

6. The method according to any one of the preceding claims, - in, The Coriolis mass flow meter includes an (electromechanical) actuator device, which is specifically formed by at least one electrodynamic oscillation actuator for converting electrical power into (forced) mechanical oscillation for exciting and maintaining the at least one measuring tube, particularly the mechanical power of the effective oscillation. - And wherein, the excitation of the mechanical oscillation of the measuring tube includes generating an electrical excitation signal (e1), such that the excitation signal contains at least one effective component (e1N), i.e., has an effective frequency (f) corresponding to the (instantaneous or to be excited) frequency. N The (alternating) frequency (alternating) current component of the excitation signal (e1) specifically makes a (phase) difference of not less than 0.1° and / or not more than 10° between the phase angle of the effective component (e1N) of the excitation signal (e1) and the (pressure) oscillation component (d1M) of the pressure signal (sD1).

7. The method according to any one of the preceding claims, wherein, Achieving at least a temporary periodic (pressure) change in the (first) pressure (p1) in the substance to be measured flowing through the flow channel includes: forming a standing wave (acoustic) wave within the substance to be measured, particularly such that the standing wave is at least partially formed within the at least one measuring tube and / or at least one of the first and second pipeline sections of the (process) pipeline.

8. The method according to any one of claims 1-7, wherein, The pressure measuring device is hydraulically connected, in particular, to the second pipeline section or its interior of the (process) pipeline, such that the pressure measuring device is mounted on the (pipe) wall section of the second pipeline section and / or the pressure measuring device is hydraulically connected to the interior of the second pipeline section of the (process) pipeline through the (pipe) wall section of the second pipeline section (forming a pressure pickup point).

9. The method according to any one of claims 1-7, wherein, The (first) pressure measuring device is hydraulically connected to the first pipeline section or its interior of the (process) pipeline, particularly such that the pressure measuring device is mounted on the (pipe) wall section of the first pipeline section and / or such that the pressure measuring device is (hydraulically) connected to the interior of the first pipeline section of the (process) pipeline through the (pipe) wall section of the first pipeline section (forming a pressure pickup point).

10. The method according to the preceding claim, wherein, The first pressure measuring device for detecting the first pressure is hydraulically connected to the inner cavity of the first pipeline section of the process pipeline (forming the first pressure pickup point) via a pipe wall section of the first pipeline section, specifically such that the first pressure pickup point is formed at a distance from the center of the at least one measuring tube at a distance not less than 120% and / or not more than 200% of the oscillation length of the at least one measuring tube, wherein the oscillation length corresponds to the free length of the tube between the two widest separated nodes of the effective oscillation, and / or such that the first pressure pickup point is formed at a distance from the center of the at least one measuring tube at a distance not less than 0.25 times and / or not more than 0.5 times the acoustic wavelength of the calibration fluid at the resonant frequency (lowest and / or usable as an effective frequency) of the measuring tube fully filled with calibration fluid, wherein the calibration fluid is distilled water having a fluid temperature of 25°C.

11. The method according to the preceding claim, - in, The (first) pressure is detected (by the first pressure measuring device) at a distance not less than 120% and / or not more than 200% of the oscillation length of the at least one measuring tube from the center of the at least one measuring tube, the distance corresponding to the (free) length of the tube between the two widest points of separation in the effective oscillation; and / or - Wherein, the (first) pressure is detected (by the first pressure measuring device) at a distance not less than 0.25 times and / or not more than 0.5 times the (acoustic) wavelength of the calibration fluid at the (lowest and / or effective frequency) resonant frequency of the measuring tube completely filled with the calibration fluid, wherein the calibration fluid is (distilled) water with a (fluid) temperature of 25°C.

12. The method according to any one of the preceding claims, wherein, The measurement system further includes a second pressure measuring device, which is specifically designed to be stand-alone and / or compact, connected to the (process) pipeline, and the method further includes: - Using the second pressure measuring device -- Detect the time-varying (static) second pressure (p2) of the fluid to be measured. -- and generate at least one, particularly electrical, second pressure signal (d2), the second pressure signal (d2) responding to the time-varying nature of the second pressure (p2) using at least one signal parameter, particularly voltage and / or current. ); - In particular, for at least two oscillation cycles of the effective oscillation and / or simultaneously with the (pressure) change in the first pressure (p1), causing at least a temporary periodic (pressure) change in the (static) second pressure (p2) of the analyte flowing through the flow channel, such that... -- The pressure change is at least partially a periodic pressure oscillation, particularly one that is synchronous with the pressure oscillation of the first pressure (p1), the periodic pressure oscillation having a pressure oscillation frequency (f) corresponding to the pressure oscillation of the first pressure (p1). pl ) and / or effective frequency ( The frequency (f) of the pressure oscillation p2 ), -- And such that the pressure signal (d2) at least temporarily contains at least one (pressure) oscillation component (d2M), i.e., has a frequency f corresponding to the (pressure oscillation) frequency. p2 The (signal) frequency (pressure oscillation related) spectrum signal component; - and using the second pressure signal (d2), in particular at least the (pressure) oscillation component (d2M) of the second pressure signal, to detect and / or compensate for the fault in the measurement system.

13. The method according to any one of the preceding claims, - Wherein, detecting and / or compensating for the fault in the measurement system includes monitoring the pressure (p1) and / or the periodic (pressure) changes of the pressure (p1) based on the (first) pressure signal (d1), particularly at least the (pressure) oscillation component (d1M) of the pressure signal (d1); and / or - in, Using the oscillation signal includes converting the oscillation signal into a digital oscillation signal.

14. The method according to any one of the preceding claims, - Also includes: The pressure signal (d1), and in particular at least the (pressure) oscillation component (d1M) of the pressure signal, is used to monitor the pressure (p1) and / or the periodic (pressure) changes; and / or - Also includes: the (instantaneous) effective frequency ( The pressure is transmitted from the Coriolis mass flow meter to the pressure measuring device, specifically for monitoring the pressure (p1) and / or the periodic (pressure) changes or for detecting the (pressure) oscillation component (d1M) of the pressure signal.

15. The method according to any one of the preceding claims, wherein, Using the pressure signal includes determining the pressure signal for incorporating the (pressure oscillation) frequency f. p The (pre-specified) frequency band of the (pressure signal) and / or the power density spectrum for the (pressure) oscillation component (d1M).

16. The method according to the preceding claim, wherein, Detecting the fault in the measurement system involves comparing a determined power density spectrum of the (pressure signal) band with a pre-specified (power density spectrum) threshold, which represents a pre-specified fault in the measurement system, particularly one classified as unacceptable or critical.

17. The method according to any one of the preceding claims, wherein, Using the pressure signal includes determining the spectral power density of at least the (pressure) oscillation component of the pressure signal.

18. The method according to the preceding claim, wherein, Detecting the fault in the measurement system involves comparing the spectral power density of the oscillating component of the pressure signal with a pre-specified power density threshold, which represents a pre-specified fault in the measurement system, particularly one classified as unacceptable or critical.

19. The method according to any one of the preceding claims, wherein, Using the pressure signal includes determining the signal amplitude of the (pressure) oscillation component of the pressure signal.

20. The method according to the preceding claim, wherein, Detecting the fault in the measurement system involves comparing the signal amplitude of the oscillating component of the pressure signal with a pre-specified amplitude threshold, which represents a pre-specified fault in the measurement system, specifically classified as unacceptable or critical.

21. The method according to any one of the preceding claims, wherein, The (pressure oscillation) frequency Corresponding to the effective frequency (M=1).

22. The method according to any one of claims 1-21, wherein, The (pressure oscillation) frequency Corresponding to the effective frequency 2 times (M=2).

23. The method according to any one of the preceding claims further comprises: If the measurement accuracy of the measurement system is deemed impaired and / or if the (pressure oscillation) frequency is deemed unacceptable, then the measurement is deemed impaired. With the effective frequency The difference is less than an integer multiple of the effective frequency f. N If the threshold is 10%, a (warning) message is issued, specifically declared as an alert (Err_p).

24. The method according to any one of the preceding claims, - Wherein, inducing the flow of the analyte includes using a (delivery) pump connected to the pipeline and / or opening a valve inserted into the pipeline; and / or - in, The effects of the (pressure) changes include the use of pumps, particularly changes in the pump's delivery rate, and / or the use of valves, particularly changes in valve position; and / or - wherein the (pressure) change is caused at least in part by the effective oscillation of the at least one measuring tube.

25. The method according to any one of the preceding claims, wherein, Using the pressure signal includes converting the pressure signal into a digital pressure signal.

26. The method according to the preceding claim, wherein, Using the pressure signal includes applying a digital filter to the digital pressure signal, the digital filter being particularly adaptable with respect to the z-transfer function and / or configured as a bandpass filter and / or having a bandwidth of less than 100 Hz and / or having a frequency less than the effective frequency. The 10% bandwidth specifically enables the digital output signal, which is close to the oscillating component of the pressure signal, to be provided at the output of the digital filter.

27. The method according to the preceding claim further comprises: - A digital output signal close to the pressure oscillation component is provided at the output of the digital filter; - And the output signal of the digital filter is also used to detect the fault in the measurement system and / or compensate for the fault in the measurement system.

28. The method according to any one of claims 26-27, further comprising: Set the z-transfer function of the digital filter. In particular, the center frequency of the digital filter and / or the bandwidth of the digital filter.

29. The method according to the preceding claim, wherein, Set the z-transfer function of the digital filter. Including taking into account the effective frequency In particular, during the calculation (of the z-transfer function) of one or more filter coefficients and / or such that the center frequency of the digital filter is set to the effective frequency. =1 times (M=1), and / or the bandwidth of the digital filter is set or correspondingly maintained at less than the effective frequency. 10%.

30. The method according to any one of the preceding claims further comprises: The effective frequency is quantified by the Coriolis mass flow meter. One or more digital (effective frequency) values.

31. The method according to any one of claims 28-29, each in conjunction with claim 30, wherein, The z-transfer function of the digital filter The setup includes using one or more effective frequency measurements, specifically for calculating the center frequency of the digital filter and / or the bandwidth of the digital filter.

32. The method according to the preceding claim further comprises: In particular, one or more available frequency values ​​are transmitted to the pressure measuring device via a communication channel between the pressure measuring device and the Coriolis mass flow meter, the communication channel being formed by a fieldbus and / or by (industrial) Ethernet and / or by an IO link and / or by wireless HART and / or by ZigBee and / or by Bluetooth.

33. The method according to any one of the preceding claims, further comprising: The at least one oscillating signal, in particular the effective component, is used to generate one or more density measurements, in particular digital density measurements, representing the density of the measured material, such that the one or more density measurements depend on the effective frequency.

34. The method according to any one of claims 28-32, each in conjunction with claim 33, wherein, Set the z-transfer function of the digital filter. This includes using one or more density measurements, particularly for converting the density of the substance to be measured into the center frequency and / or bandwidth of the digital filter.

35. The method according to the preceding claim further comprises: Specifically, one or more density measurements are transmitted to the pressure measuring device via a communication channel between the pressure measuring device and the Coriolis mass flow meter, the communication channel being formed by a fieldbus and / or by (industrial) Ethernet and / or by an IO link and / or by wireless HART and / or by ZigBee and / or by Bluetooth.

36. The method according to any one of the preceding claims, in, The Coriolis mass flow meter has a (mass flow) converter electronics, which are specifically housed in the electronics housing of the Coriolis mass flow meter.

37. The method according to any one of the preceding claims, wherein, The pressure measuring device includes, in particular, a (pressure) converter electronics housed in the electronic device housing of the pressure measuring device.

38. The method according to claims 36 and 37, wherein, The (mass flow) converter electronics of the Coriolis mass flow meter and the (pressure) converter electronics of the pressure measuring device transmit and / or receive (measurement and / or operation) data via a common communication channel, which is formed in particular by data lines and / or radio connections, particularly via communication channels formed by fieldbus and / or by (industrial) Ethernet and / or IO links and / or wireless HART and / or ZigBee and / or Bluetooth.

39. The method according to claims 30 and 38, further comprising: The data channel is used to transmit one or more effective frequency values ​​to the pressure measuring device.

40. The method according to claims 33 and 38, further comprising: The data channel is used to transmit one or more density measurements to the pressure measuring device.

41. A measurement system, particularly a measurement system configured to perform the method according to any one of the preceding claims, the measurement system being used to measure the mass flow rate of a flowing fluid substance, particularly a gas, liquid, or dispersion, the measurement system comprising: - (process) pipelines, which are specifically designed as conduits; - Coriolis mass flow meters, especially stand-alone Coriolis mass flow meters and / or compact Coriolis mass flow meters. -- Having at least one (first) measuring tube (fluidly) integrated into the (process) pipeline during its stroke, -- Equipped with an (electromechanical) actuator device, -- Equipped with sensor devices, -- and has (mass flow) converter electronics electrically connected to the actuator device and the sensor device; - and at least one (first) pressure measuring device, particularly a stand-alone pressure measuring device and / or a compact pressure measuring device and / or a differential pressure measuring device, -- Having at least one pressure sensor connected (in a pressure transmission manner) to the (process) pipeline. -- and has a (pressure) converter electronics electrically connected to the at least one pressure sensor; - Wherein, the flow channel of the measurement system suitable for guiding the analyte is formed by the inner cavity of the first pipeline section of the (process) pipeline connected to the Coriolis mass flow meter at the inlet side, the inner cavity of the at least one measuring tube of the Coriolis mass flow meter, and the inner cavity of the second pipeline section of the (process) pipeline connected to the Coriolis mass flow meter at the outlet side. - Wherein, the (mass flow) converter electronics of the Coriolis mass flow meter are configured to generate an exciter signal (for the exciter device) for feeding into the exciter power of the exciter device for excitering effective oscillation, i.e., a forced mechanical (bending) oscillation of the at least one measuring tube around a rest position having an effective frequency (set), particularly greater than 50 Hz and / or less than 2000 Hz, i.e., a pre-specified (target) oscillation frequency, which specifically corresponds to the mechanical resonant frequency of the measuring tube or the Coriolis mass flow meter formed therewith, and / or depends on the viscosity and / or density of the measured medium, such that the excitation signal contains at least one effective component (e1N), i.e., an (AC) current component, which has an effective frequency (instantaneous or to be excited) corresponding to the effective frequency (e1N). The (alternating) frequency, especially corresponding to the effective frequency ( The (AC) frequency and the current intensity corresponding to the (target) oscillation amplitude; - And wherein the actuator device is configured to convert the electrical power provided by the actuator signal into mechanical power (causing effective oscillation of the at least one measuring tube); - Wherein, the sensor device is configured to detect the (effective) oscillations of the at least one measuring tube and convert them into at least one (particularly electrical or optical) (first) oscillation signal (s1), such that the at least one oscillation signal (s1) contains at least one (oscillation) effective component (s1N), i.e., has a frequency corresponding to the (instantaneous) effective frequency. The signal frequency and the spectral signal components that depend on the phase angle of the mass flow rate of the substance to be measured; - And wherein, the (mass flow) converter electronics of the Coriolis mass flow meter are configured to receive and evaluate the at least one oscillation signal, i.e. -- Specifically, one or more (mass flow rate) measurements representing the mass flow rate of the fluid to be measured are determined based on the phase angle of the effective component of the at least one (first) oscillation signal, particularly quantified and / or digital (mass flow rate) measurements. -- and to determine, in particular, one or more (frequency) measurements that quantify the effective frequency; - Wherein, the pressure sensor is configured to detect the time-varying (static) pressure (p1) of the analyte flowing (in the flow channel) and convert it into at least one, particularly electrical, (first) pressure signal (d1), the at least one (first) pressure signal (d1) responding to the time-varying (first) pressure (p1) using at least one signal parameter, particularly the time-varying voltage and / or current. ); - And wherein, the (pressure) converter electronics of the pressure measuring device are configured to monitor the pressure (p1) and / or monitor periodic (pressure) changes in the pressure (p1) and / or detect, in particular, temporary malfunctions of the measuring system caused by the periodic (pressure) changes in the pressure (p1), particularly impairment of the measurement accuracy of the Coriolis mass flow meter or the measuring system, i.e., the one or more (mass flow) measurements, using their accuracy in quantifying mass flow, receive and evaluate the at least one pressure signal, i.e., based on the pressure signal, determine the (first) pressure (p1) in the analyte flowing through the flow channel, particularly whether or to what extent periodic (pressure) changes occur for at least two or more oscillation cycles of the effective oscillation, the (pressure) changes being particularly undesirable and / or impairing the measurement accuracy of the Coriolis mass flow meter or the measuring system, the (pressure) changes having at least partially periodic pressure oscillations, the periodic pressure oscillations having a (pressure oscillation) frequency for two or more oscillation cycles. ( The (pressure oscillation) frequency Deviation from the effective frequency (positive) integer multiples M ( The effective frequency In particular, the effective frequency 10% of (M=1), and specifically corresponding to the effective frequency. The positive integer multiple M is used to determine whether the pressure signal (sD1) at least temporarily contains at least one (pressure) oscillation component (d1M), i.e., has a frequency corresponding to the (pressure oscillation) frequency. The (signal) frequency (pressure oscillation related) spectrum signal component.

42. The measurement system according to any one of the preceding claims, - in, In the event of a detected malfunction in the measurement system caused by a periodic (pressure) change in pressure (p1), the converter electronics of the pressure measuring device are configured to signal an output warning message (Err_p), specifically transmitting the message to the converter electronics of the Coriolis mass flow meter; and / or - Wherein, the converter electronics of the Coriolis mass flow meter are configured to output determined (digital) measurements, particularly mass flow measurements and / or frequency measurements, and in particular to transmit them to the converter electronics of the pressure measuring device; and / or - Wherein, the converter electronics of the Coriolis mass flow meter and the converter electronics of the pressure measuring device are coupled to each other in a signal transmission manner, forming a common digital communication channel, specifically formed by data lines and / or via radio connections, and are configured to transmit (measurement and / or operation) data, particularly (digital) measurements, to each other via the communication channel, and especially to signal one or more (warning) messages (Err_p) indicating a fault in the measuring system caused by periodic (pressure) changes in the pressure (p1); and / or - Wherein, the converter electronics of the Coriolis mass flow meter are configured to determine one or more (density) measurements representing the density of the fluid to be measured based on the at least one oscillation signal, particularly quantified and / or digital values, especially using one or more frequency measurements; and / or - Wherein, the pressure sensor of the first pressure measuring device is hydraulically connected, in particular, to the first section of the (process) pipeline; and / or - Wherein, the first pressure measuring device has a second pressure sensor that is (hydraulically) connected to the (process) pipeline, and in particular to the second pipeline section of the (process) pipeline.

43. The measurement system according to any one of the preceding claims, - in, The converter electronics of the Coriolis mass flow meter are configured to transmit one or more frequency measurements to the converter electronics of the pressure measuring device. - And wherein the converter electronics of the pressure measuring device are configured to receive and process frequency measurements transmitted by the converter electronics of the Coriolis mass flow meter, in particular taking into account one or more of the (received) frequency measurements to evaluate the at least one pressure signal and / or detect (caused by periodic pressure changes) the fault of the measuring system while taking into account one or more of the (received) frequency measurements.

44. The measurement system according to any one of the preceding claims, wherein, The sensor device includes at least one first oscillation sensor for generating the first oscillation signal, particularly an electrodynamic sensor.

45. The measurement system according to the preceding claim, wherein, The sensor device includes at least one second oscillation sensor, which is particularly electrically powered and / or structurally identical to the first oscillation sensor, and is used to generate a second oscillation signal.

46. ​​The measurement system according to any one of the preceding claims further comprises: A second pressure measuring device is connected to the (process) pipeline. The second pressure measuring device is particularly independent and / or designed as a compact device and / or constructed identically to the first pressure measuring device. The second pressure measuring device has a sensor connected (in a pressure transmission manner) to the pressure of the (process) pipeline and has (pressure) converter electronics electrically connected thereto.

47. The measurement system according to any one of the preceding claims is used for measuring the mass flow rate of a fluid substance, particularly a gas, liquid or dispersion.

Images