Coriolis flow measuring device and method for calibrating and / or operating coriolis flow measuring device

Abstract

The invention relates to a Coriolis flow measuring device (1) for determining a mass flow rate, a medium density and / or a medium viscosity of a fluid measurement medium, in particular a liquid, in a process line, comprising:-a measuring system (10), the measuring system (10) having a measuring line (11) for conveying the measurement medium, the measuring line (11) being arranged in the process line (11); the measuring system (10) has at least one measuring tube (12); -a calibration system (20), the calibration system (20) having a calibration line (21), separate from the measuring line (11), for conveying a calibration medium, the calibration system (20) comprising at least one calibration tube (22); -a (combined) exciter system (30) for exciting mechanical oscillations of both the measurement system and the calibration system; -a (combined) sensor system (40) for detecting mechanical oscillations of both the measurement system and the calibration system, in which the exciter system (30) and the sensor system (40) are each connected, in particular in a detachable manner, to the measurement system (10) and to the calibration system (20), in particular to the measurement system (10) and the calibration system (20). The exciter system (30) and the sensor system (40) are preferably detachably connected to the measurement system (10) and the calibration system (20); and measurement and calibration electronics (50), where the measurement and calibration electronics (50) are electrically connected to both the exciter system (30) and the sensor system (40) and are configured to oscillate both the measurement tube (12) and the calibration tube (22) by means of the exciter system (30) and to determine oscillations of the measurement tube (12) and the calibration tube (22) by means of the sensor system (40), where the measurement and calibration electronics (50) are electrically connected to both the exciter system (30) and the sensor system (40). The measurement and calibration electronics (50) are configured to determine at least one calibration variable of an integral system formed by the measurement system (10) and the calibration system (20), based on oscillations of both the measurement system (10) and the calibration system (20) conveying the calibration medium, as determined by the sensor system (40), and wherein the measurement system (10) and the calibration system (20) are coupled to the sensor system (40), the measurement and calibration electronics (50) are configured to determine a mass flow rate, a medium density and / or a medium viscosity of a measurement medium conveyed in the measurement system (10) as a function of at least one calibration variable and / or a variable derived therefrom.

Description

Technical Field

[0001] This invention relates to a Coriolis flow measurement device for determining the mass flow rate, density, and / or viscosity of a fluid measurement medium (particularly a liquid) in a process pipeline, and to a method for calibrating and / or operating the Coriolis flow measurement device (particularly the Coriolis flow measurement device according to the invention). Background Technology

[0002] WO 2021 / 021116 A1 discloses a Coriolis flow measurement device having a measurement system and a compensation system. The measurement system includes a measurement line and a measurement tube that cannot be detached from the measurement line. The compensation system includes a compensation tube for conveying a compensation medium. Using the measurement device's electronics, the mass of the compensation system can be set by introducing the compensation medium into the compensation tube in a manner corresponding to or intentionally deviating from the mass of the measurement system. The basic idea is to extend the density range of the measurement medium by making the mass of the compensator variable—the limits of which are limited and fixed by the constant mass of a conventionally used compensator.

[0003] WO 99 / 51946 A1 discloses a clamp-on Coriolis flow measurement device that can be detachably reattached to or reconnected to the housing surface of an existing process pipeline. EP 1 150 104 A2 discloses a clamp-on Coriolis flow measurement device with a housing that can be attached to a process pipeline, and a support plate with an oscillation generator and a measuring sensor arranged within the housing. The housing is arranged on the process pipeline in such a way that, during operation, the oscillation generator enables the process pipeline to mechanically oscillate, and the measuring sensor is capable of detecting the oscillation of the process pipeline.

[0004] According to WO 2019 / 017891 A1 or WO 2021 / 121867 A2, and German patent applications DE102021105397 A1, DE 102020133614 A1, DE 102020132685 A1, DE 102020133851 A1, DE102020133566 A1, DE 102020132986 A1, DE 102020132686 A1, DE 102020132685 A1, DE102020131452 A1, DE 102020132223 A1, DE 102020127356 A1, and DE 102020114519 A1 and DE102020112154 A1, in each of these documents, are known to be (modular) vibration electronic measurement systems, which consist of a carrier system, pipe modules mechanically connected to the carrier system, and measurement system electronics electrically connected to the carrier system, and are used to detect at least one measurement variable of a fluid measuring substance flowing in a (measuring substance) pipeline, i.e., to determine the measured value of one or more measurement variables of the measuring substance, such as mass flow rate, volumetric flow rate, density, and / or viscosity.

[0005] The carrier system of this (modular) vibration electronic measurement system has a (protective) housing with at least one chamber at least partially surrounded by housing walls, and one or more electrical coils (e.g., cylindrical and / or designed as air-core coils) placed (at a distance from each other) within the chamber of the (protective) housing and at least indirectly mechanically connected to the housing walls. Each coil is also electrically connected to the measurement system electronics. The measurement system electronics can be at least partially housed inside and / or at least partially outside the (protective) housing—for example, in a separate electronics housing. In particular, the carrier system is also configured to receive the tube module of the measurement system and is mechanically fixed (forming a vibration transducer) but detachably connected to the tube module of the measurement system, particularly forming the vibration electronic measurement system itself; especially, this can also be achieved in a way that the tube module is locked in the carrier system or cannot be moved.

[0006] The corresponding measuring system's tubing module is also designed to be replaceable in such a way that it can be inserted into the chamber from outside the (protective) housing of the carrier system or through an (insertion) opening in the housing wall (particularly possible in the field), and can be removed from the carrier system again non-destructively (potentially without tools), particularly from outside the housing, and / or through the (insertion) opening in the housing, or without having to deal with the carrier system itself or remove it from the (process) equipment. Among other things, this also allows for the subsequent insertion of the tubing module in the field, i.e., into the installed carrier system, or for the replacement of a defective or worn tubing module in the field with a new, intact tubing module that can be used only once or only for a predetermined period of time ("disposable"). Each tube module also has one or more (e.g., cylindrical) permanent magnets and is configured to be mounted in the support system in such a way that each permanent magnet is placed in the aforementioned cavity, but still at a distance from the housing wall, specifically in such a way that each permanent magnet is held in a predetermined static mounting position with alignment and / or minimum distance relative to an electrical coil of the support system, and the corresponding imaginary longitudinal axis of each permanent magnet is aligned with or extends parallel to the imaginary longitudinal axis of at least one electrical coil in the extension direction.

[0007] In the measurement system, each tube module also has at least one measuring tube, for example, which is at least partially straight and / or at least partially curved, having a tube wall forming the outer surface of the tube, particularly made of a metal or plastic material, and having an inner cavity surrounded by the same tube wall, particularly two substantially identical parallel measuring tubes, and each of the aforementioned permanent magnets is fixed to the outside of the tube wall, particularly to a central section extending between a first section end and a second section end distant from the first section end, particularly connected to the tube wall by means of material bonding. Furthermore, the tube module or at least one of its measuring tubes is designed to be installed in the housing without tools if necessary, such that the tube is at least partially (partially) placed within the cavity but still spaced from the housing wall, and each permanent magnet in its respective mounting position forms a voice coil (partially used as an electro-oscillating exciter) and / or a plunger coil (partially used as an electro-oscillating sensor) together with a corresponding electrical coil. In the case of at least partially curved measuring tubes, the aforementioned central section may, for example, be generally U-shaped or V-shaped. In this vibration electronic measurement system, each of the aforementioned measuring tubes is also configured to deliver a fluid measuring substance flowing in the cavity during operation, in particular having a predetermined flow direction and / or a flow direction from the first section end to the second section end, and is configured to simultaneously vibrate to produce a measurement effect related to one or more measurement variables of the measuring substance, in particular vibrating in such a way that the central section performs an oscillating motion about a static rest position and / or the measuring tube is driven by at least one of the aforementioned (energized) voice coils, and / or by generating (alternating) voltages representing the oscillating motion of at least one tube and thus serving as an oscillation signal through the aforementioned plunger coils. The measurement system electronics of such a measurement system are further configured to: feed electrical power to at least one electric coil forming the voice coil via an electric drive signal (particularly having an applied alternating current and / or an applied (alternating) frequency substantially corresponding to the resonant frequency of the at least one tube), and / or determine the measured value of one or more detectable measurement variables of the measuring substance flowing through the (measuring) tube or multiple tubes via an (alternating) voltage generated by the at least one electric coil forming the plunger coil, for example, in the case of a measurement device designed as a Coriolis mass flow meter or a measurement device designed as a Coriolis mass flow / density measurement device, i.e., based on the (measured) phase difference between two of the aforementioned oscillating signals caused by the Coriolis force in the measuring substance flowing through the oscillating tube and a phase difference to measurement value characteristic curve function configured in the measurement system electronics, to generate a (mass flow) measurement value representing the mass flow rate.The phase difference-mass flow rate measurement characteristic curve function can, for example, be a (linear) parametric function with a (scaled) zero point and a slope. The (scaled) zero point corresponds to the (measured) phase difference between two oscillating signals measurable when the measured substance is stationary or when the mass flow rate is zero. The slope corresponds to the (measurement) sensitivity of the measurement system or the change in the (measured) phase difference related to the change in mass flow rate. Since one or more resonant frequencies of the at least one tube also depend particularly on the instantaneous density of the corresponding medium, by means of such a measurement system, in addition to the mass flow rate, the density of the respective measured substance flowing through the tube can be directly measured by the (AC) frequency of the drive signal and / or by the (signal) frequency of at least one oscillating signal. Therefore, the measurement system electronics of this type of measurement system are typically also equipped to generate (density) measurements representing density based on the (AC) current frequency of the aforementioned drive signal and / or based on the corresponding signal frequency of at least one oscillating signal, for example, using a useful frequency-measurement characteristic curve function appropriately configured in the measurement system electronics. Furthermore, with the aid of the aforementioned type of vibration electronic measurement system, the viscosity of the flowing medium can be directly measured, for example, based on the exciter energy or excitation power required to maintain useful oscillations, and / or based on the damping of the excited (resonant) oscillations caused by the dissipation of oscillation energy, or by using a damping-measurement characteristic curve function appropriately configured in the measurement system's electronics. Moreover, with the aid of such a vibration electronic measurement system, further measurement variables, such as the Reynolds number, derived from the aforementioned flow rate and / or material parameters can be readily determined.

[0008] To simplify the commissioning of the measurement system formed in this manner, the tube module may also have at least one identification element associated with or carrying identification information related to the tube module, such as a barcode, QR code, or RFID tag attached to at least one tube, and / or the carrier system may have at least one light-emitting semiconductor element (e.g., a light-emitting diode (LED)) located inside the (protective) housing and connected to the measurement system electronics, and / or one or more radio transmitters / receivers (RF transceivers) and / or light sensors (e.g., one or more CCD light sensors and / or one or more CMOS light sensors), each located inside the (protective) housing and connected to the measurement system electronics.

[0009] Vibration electronic measurement systems of this type must also periodically check their functional effectiveness or any deviation from a predetermined corresponding reference state, for example, determined by the manufacturer or at the manufacturer's factory and / or during the calibration or commissioning of the corresponding measurement system in the field, so as to detect, for example, a decline in the functionality or measurement accuracy of the measurement system associated with an increase in the reference state deviation as early as possible, based on which the measurement system ultimately maps the measured variables (especially mass flow rate and density) to the corresponding measured values. Such a decline in the functional effectiveness or measurement accuracy of the measurement system may, for example, manifest as a largely irreversible change in the impedance of the aforementioned oscillating coil and / or plunger coil, and / or a permanent reduction in the stability of the mechanical connection between the base and the tube module or a permanent reduction in the positioning accuracy of the tube module in the load-bearing system, or the decline in functional effectiveness or measurement accuracy may be caused by factors such as, for example, thermal overload and / or mechanical overload caused by very high or very low temperatures inside the load-bearing system, aging, increased or condensed moisture inside the load-bearing system, and / or wear of the components of the load-bearing system due to frequent replacement of the tube module. Other factors that may indirectly and / or temporarily impair the functional effectiveness of the measurement system include multi-frequency and / or high-frequency electromagnetic (external) radiation or fields (EMC) propagating within the load-bearing system, or (external) sound waves propagating within the load-bearing system (e.g., in the form of structure-propagating sound).

[0010] Therefore, it is necessary to periodically assume whether one or more of the system functions (transfer functions) inherent in the measurement system have also changed compared to the (reference) system functions inherent in the corresponding original transducer, where each system function characterizes one or more functional relationships between the aforementioned oscillating signal and the corresponding drive signal, or between the oscillating signal and the drive signal and the corresponding flow rate and / or material parameters of the measured substance. Examples of such system functions of the measurement system include a mass flow rate-phase difference system function (according to which the aforementioned (measured) phase difference of the oscillating signal depends on the mass flow rate), or a transducer density-resonance frequency system function (according to which one or more resonant frequencies of the at least one tube depend on the density of the measured substance). Correspondingly, the measurement functions of the measurement system, which involve the aforementioned system functions, are also affected by this (over)load of the transducer. The measurement system as a whole converts the corresponding measured variables to be recorded into corresponding measured values ​​based on these measurement functions. For example, the characteristic curve function composed of the aforementioned mass flow rate-phase difference system function and phase difference-mass flow rate measurement characteristic curve function (i.e., the characteristic curve function implemented in the measurement system's electronic equipment, according to which the determined phase difference is converted into a mass flow rate measurement value), and the mass flow rate-measured value measurement function of the measurement system (according to which the mass flow rate measurement value determined depends on the mass flow rate). The phase difference-mass flow rate measurement characteristic curve function can, for example, be a (linear) parametric function with a (scale) zero point and a (measurement) sensitivity. The (scale) zero point corresponds to the (measured) phase difference measured when the measured substance is stationary, and the (measurement) sensitivity corresponds to the change in the (measured) phase difference (the slope of the characteristic curve function) related to the change in mass flow rate. Other examples of such system functions, or measurement functions derived from them, that may also be potentially affected by faults include the transducer's density-resonant frequency system function, or the density-measured value (measurement) function of the measurement system involved, and the resonant frequency-density measured value characteristic curve function of the measurement system's electronics, and / or the transducer's viscosity-damping system function, or the viscosity-measured value (measurement) function of the measurement system involved, and the damping-viscosity measured value characteristic curve function of the measurement system's electronics. Therefore, changes in the corresponding system functions can have effects, such as drifts in one or more of the corresponding characteristic curve parameters of one or more of the aforementioned characteristic curve functions, or, in the case of linear parameter functions, drifts in their zero points and / or their slopes. Occasionally, such (potentially irreversible) changes in one or more system functions or measurement functions of the measurement system can also cause the entire measurement system to malfunction, to the point that the high measurement accuracy typically pursued in such measurement systems can no longer be guaranteed. This means that the functional effectiveness of the measurement system is severely compromised (or may even be suspended), or that the affected measurement system suffers a corresponding serious fault.

[0011] With this in mind, measurement systems of this type are typically calibrated at the factory. Needless to say, factory calibration can never fully represent the specific usage conditions in the field. Particularly common for this type of measurement system is that the measurement environment (i.e., the measurement medium, process pipelines, and / or components of the measurement system) can change frequently.

[0012] Furthermore, particularly in applications with high requirements for measurement systems, it may be of interest to perform (re)calibration on the Coriolis flow measurement device without removing the entire measurement system or components of the measurement system from the process pipeline.

[0013] In addition, when using sterile (disposable) measurement tubes, it is desirable that they do not come into contact with the calibration medium before use. Summary of the Invention

[0014] This invention aims to provide a suitable solution for field calibration.

[0015] This objective is achieved by the Coriolis flow measurement device according to claim 1 and the method for calibrating and / or operating the Coriolis flow measurement device according to claim 19.

[0016] The Coriolis flow measurement device according to the present invention for determining the mass flow rate, density, and / or viscosity of a fluid measurement medium (particularly a liquid) in a process pipeline comprises:

[0017] - Measurement system,

[0018] The measurement system includes a measurement pipeline for conveying the measurement medium.

[0019] The measurement system has at least one measuring tube, particularly a sterile and / or detachably connected to a measuring line and / or a measuring tube designed as a disposable product;

[0020] - Calibration system,

[0021] The calibration system has a separate calibration line for delivering the calibration medium (particularly water or glycerin) from the measurement line.

[0022] The calibration system includes at least one calibration tube, particularly a non-sterile calibration tube and / or a calibration tube arranged parallel to the measuring tube;

[0023] - A (“combined”) actuator system for stimulating the mechanical oscillations of both the measurement system and the calibration system;

[0024] - A (“combined”) sensor system for detecting mechanical oscillations in both the measurement system and the calibration system;

[0025] The actuator system and the sensor system are each connected to the measurement system and the calibration system, and in particular, the actuator system and the sensor system are preferably detachably connected to the measurement system and the calibration system.

[0026] - and measurement and calibration electronic equipment,

[0027] The measurement and calibration electronics are electrically connected to both the actuator system and the sensor system, and are configured to cause both the measurement tube and the calibration tube to oscillate via the actuator system, and to determine the oscillation via the sensor system.

[0028] The measurement and calibration electronics are configured to, particularly in the case of conveying a calibration medium in a calibration system at a predetermined (reference) mass flow rate and / or predetermined (reference) density and / or predetermined (reference) viscosity, determine at least one calibration variable of the overall system formed by the measurement system and the calibration system based on the oscillations of both the measurement system (particularly the measurement system conveying the measurement medium) and the calibration system conveying the calibration medium, as determined by the sensor system.

[0029] The measurement and calibration electronic equipment is configured to, particularly when the measurement medium flows in the measurement system, determine the mass flow rate, medium density, and / or medium viscosity of the measurement medium transported in the measurement system based on the at least one calibration variable and / or a variable derived from the at least one calibration variable, particularly based on the oscillations of the measurement system (particularly the measurement system through which the measurement medium flows) and the calibration system (particularly the calibration system that transports the calibration medium) determined by the sensor system.

[0030] Advantageous embodiments of the present invention are the subject of the dependent claims.

[0031] One embodiment specifies that the actuator system and the sensor system are either each non-detachably connected to the measurement system and detachable from the calibration system, or each non-detachably connected to the calibration system and detachable from the measurement system, or each detachably connected to the calibration system and detachable from the measurement system.

[0032] One embodiment specifies that the measurement system and the calibration system are configured to be flowed through by the measurement medium or the calibration medium independently of each other, specifically such that the measurement medium and the calibration medium flow through the Coriolis flow measurement device simultaneously at a biased mass flow rate and / or flow through the Coriolis flow measurement device at different times.

[0033] One embodiment specifies that the calibration system includes a pump configured to pump a calibration medium through a calibration line at a predetermined or predeterminable mass flow rate, specifically such that the mass flow rate of the calibration medium is equal to the mass flow rate of the measurement medium and / or the mass flow rate of the calibration medium corresponds to a target mass flow rate determined based on oscillations of the measurement system delivering the measurement medium and the calibration system delivering the calibration medium, as determined by the sensor system.

[0034] One embodiment specifies that the calibration system has a calibration fastening device, by which the calibration tube can be attached, particularly radially, to the measuring tube for assembly, and can be mechanically detachably connected to the measuring tube.

[0035] One embodiment specifies that the measurement system has a measurement fastening device, by which the measurement tube can be attached, particularly radially, to the calibration tube for assembly, and can be mechanically detachably connected to the calibration tube.

[0036] In one embodiment, the Coriolis flow measurement device includes:

[0037] - Bearing system,

[0038] The actuator system and sensor system are connected to the support system, particularly in a non-detachable manner.

[0039] One embodiment specifies that the measuring tube and the calibration tube are mechanically connected to each other, particularly in a non-removable manner, and form a tube module.

[0040] The tube module can be mechanically detached and mounted on the load-bearing system.

[0041] One embodiment specifies that the carrier system has a carrier fastening device through which the measuring tube and / or calibration tube can be mechanically detachably connected to the carrier system.

[0042] One embodiment specifies that the actuator system includes a mechanical actuator that mechanically interacts with the measuring tube and the calibration tube.

[0043] One embodiment specifies that the actuator system includes an electromagnetic actuator that magnetically interacts with the measuring tube magnet and the calibration tube magnet.

[0044] The measuring tube magnet is arranged on the measuring tube.

[0045] The calibration tube magnet is arranged on the calibration tube.

[0046] One embodiment specifies that the sensor system includes at least one electric, electromagnetic, or optical sensor.

[0047] One embodiment specifies that the measuring tube and the calibration tube are mechanically coupled to each other, particularly through a mechanical coupler.

[0048] One embodiment specifies that the calibration medium has a predetermined density, a predetermined temperature, and / or a predetermined viscosity.

[0049] One embodiment specifies that the measuring tube has at least one resonant frequency equal to the resonant frequency of the calibration tube, specifically such that the resonant frequency of the inherent first-order bending oscillation mode in the measuring tube is equal to the resonant frequency of the inherent first-order bending oscillation mode in the calibration tube; and / or

[0050] The measuring tube and the calibration tube are matched in terms of one or more geometric parameters, particularly the tube length and / or the tube wall thickness and / or the diameter.

[0051] One embodiment specifies that the wall of the measuring tube is made of metal (particularly stainless steel); and / or

[0052] The wall of the calibration tube is made of metal (especially stainless steel); and / or

[0053] The wall of the calibration tube is made of the same material as the wall of the measuring tube.

[0054] One embodiment specifies that the measuring tube and the calibration tube are identical in construction.

[0055] In one embodiment, the measuring tube is part of the measuring pipeline.

[0056] One embodiment specifies that the calibration tube is part of the calibration pipeline, particularly an integral part.

[0057] One embodiment specifies that the calibration medium is different from the measurement medium.

[0058] One embodiment specifies that the calibration medium is delivered only in the calibration line and does not originate from the measurement line or process line.

[0059] The method according to the invention for calibrating and / or operating a Coriolis flow measurement device (particularly a Coriolis flow measurement device according to the invention),

[0060] The Coriolis flow measurement device includes measurement and calibration electronics, a sensor system, an actuator system, a measurement system, and a calibration system. The measurement system has a measurement line for conducting the measurement medium, and the calibration system has a separate calibration line for conducting the calibration medium.

[0061] The method includes the following steps:

[0062] - Conduct the calibration medium through the calibration line.

[0063] - If the calibration medium flows through the calibration line at a predetermined mass flow rate, then the calibration is performed.

[0064] The calibration includes stimulating the calibration pipeline and measurement pipeline to perform oscillations via the actuator system.

[0065] The calibration includes measuring the oscillations of the calibration tube and the measuring tube using the sensor system.

[0066] The calibration includes determining at least one calibration variable based on measured oscillations for the overall system consisting of the measurement system and the calibration system using the measurement and calibration electronic equipment;

[0067] - Conducts the measuring medium through the measuring pipeline;

[0068] - And determine the mass flow rate, density and / or viscosity of the measured medium based on the determined calibration variables.

[0069] One embodiment specifies that no measuring medium is present in the measuring tube during calibration.

[0070] One embodiment specifies that during calibration, the measuring tube carries a measuring medium, particularly a stationary measuring medium.

[0071] One embodiment specifies that no calibration medium is present in the calibration tube during the determination of the mass flow rate, density, and / or viscosity of the measured medium.

[0072] One embodiment specifies that, during the determination of the mass flow rate, density, and / or viscosity of the measurement medium, the calibration tube carries a calibration medium, particularly a flowing calibration medium.

[0073] In one embodiment, the method includes the following:

[0074] - Specifically, the mass flow rate of the calibration medium is set by a pump such that the mass flow rate of the calibration medium corresponds to a predetermined target mass flow rate and / or is equal to the mass flow rate of the measuring medium (delivered in the measuring line); and / or

[0075] - Especially when the measurement line is delivering the measurement medium and / or when no measurement medium is flowing in the measurement line, use the pump to set the mass flow rate of the calibration medium.

[0076] One embodiment specifies that the measuring medium and the calibration medium are matched in at least one material parameter (particularly density and / or viscosity), such that the measuring medium is used as the calibration medium or the calibration medium corresponds to the measuring medium.

[0077] One embodiment specifies that the measuring medium and the calibration medium differ from each other in at least one material parameter (particularly density and / or viscosity).

[0078] One embodiment specifies that the calibration medium contains water, specifically (distilled) water.

[0079] In one embodiment, the calibration medium contains glycerol.

[0080] One embodiment specifies that the calibration medium contains oil or is oil-based.

[0081] In one embodiment, the method includes the following:

[0082] - While the measurement medium is being delivered through the measurement pipeline, and particularly while the measurement medium is flowing through the measurement pipeline, the exciter system excites the calibration pipeline and the measurement pipeline to oscillate.

[0083] In one embodiment, the method includes the following:

[0084] - Compare the determined calibration variables with the default values ​​and / or default ranges (especially the default values ​​and / or default ranges provided at the factory). Attached Figure Description

[0085] The invention will be explained in more detail with reference to the following figures, in which:

[0086] Figure 1 The diagram shows a longitudinal section of a Coriolis flow measurement device according to the prior art;

[0087] Figure 2 A longitudinal section of a first embodiment of the Coriolis flow measurement device according to the present invention is shown;

[0088] Figure 3 A longitudinal section of a second embodiment of the Coriolis flow measurement device according to the present invention is shown;

[0089] Figure 4 A longitudinal section of a third embodiment of the Coriolis flow measurement device according to the present invention is shown;

[0090] Figure 5a This diagram illustrates the calibration process for a Coriolis flow measurement device.

[0091] Figure 5b A schematic diagram illustrating the measurement process of the Coriolis flow measurement device is shown; and

[0092] Figure 6 A perspective view of yet another embodiment of the Coriolis flow measurement device according to the present invention is shown. Detailed Implementation

[0093] Figure 1 A cross-section of a Coriolis flow measurement device according to the prior art is shown (Figure 5 in WO 2021 / 021116 A1). The vibratory electronic flow measurement device 500 shown includes a measuring tube 510 for conveying the measuring medium in flow directions 111, 112. A housing 560 is arranged on the measuring tube 510 to protect the measuring tube 510 and the components arranged within the housing. The measuring tube 510 is mechanically connected to a compensating rod 520 having a variable mass via a first coupler 570a and a second coupler 570b. The compensating rod 520 has a compensating body 522 designed such that the compensating medium 524 can flow through or into the compensating body 522. Like the measuring tube 510, the compensating rod 520 also extends at least partially within the housing 560. A left sensor coil 530a, a right sensor coil 530b, and a driver 540 located between the left and right sensor coils 530a and 530b are arranged between and coupled to the measuring tube 510 and the compensating rod 520. The left sensor coil 530a, right sensor coil 530b, and driver 540 are also coupled to a measuring device electronics 550. The measuring device electronics 550 is also electrically connected to an inlet valve 520a and an outlet valve 520b, each connected to the compensating rod 520 and configured to allow the compensating medium 524 to flow in and out. The measuring device electronics 550 is configured to control the inlet valve 520a and the outlet valve 520b to adjust the mass of the compensating rod 520 by the amount of compensating medium 524 in the compensator 522. The mass of the compensating rod remains constant over time when the mass flow rate of the medium is determined. Unlike the present invention, this compensation rod 520 is not used for (re)calibrating the Coriolis flow measurement device.

[0094] Figure 2A schematic diagram of a first embodiment of a Coriolis flow measurement device 1 according to the present invention is shown. This Coriolis flow measurement device 1 is used to determine the mass flow rate, density, and / or viscosity of a fluid measurement medium (particularly a liquid) in a process pipeline. It includes a measurement system 10, a calibration system 20, a (“combined”) actuator system 30 for exciting mechanical oscillations, a (“combined”) sensor system 40 for detecting mechanical oscillations, measurement and calibration electronics 50, and a carrier system 60, wherein the (“combined”) actuator system 30, the (“combined”) sensor system 40, and the measurement and calibration electronics 50 are arranged on the carrier system 60.

[0095] The measurement system 10 has a measurement line 11 for delivering a measurement medium and a sterile measurement tube 12 that can be detachably connected to the measurement line 11. The measurement line 11 may include at least two process connectors for connecting the measurement tube 12 to a process line or hose system. Alternatively, the measurement line 11 may include an adapter that forms a transition between the measurement tube 12 and the process line or hose system. The illustrated measurement tube 12 is a disposable product and can be replaced each time the measurement medium is changed. The measurement tube 12 may be made of metal, glass, and / or plastic materials. The measurement line 11 and the measurement tube 12 together form a measurement channel for delivering the measurement medium.

[0096] The calibration system 20 has a separate calibration line 21 for delivering calibration media (particularly water or glycerol) from the measurement line 11. In the illustrated embodiment, a calibration tube 22, extending parallel to the measurement tube 12, is designed as an integral part of the calibration line 21. Unlike the illustrated measurement tube 12, the calibration tube 22 may also be designed to be non-sterile, for example.

[0097] The measuring tube 12 and the calibration tube 22 can be matched in one or more geometric parameters (in particular, (tube) length and / or (tube) wall thickness and / or diameter), for example, they can have the same construction.

[0098] The actuator system 30 and sensor system 40 are each connected to the measurement system 10 and the calibration system 20. In the illustrated variant, the actuator system 30 and sensor system 40 are each non-detachably connected to the calibration system 20 and detachably connected to the measurement system 10. Additionally, the actuator system 30 and sensor system 40 are non-detachably connected to the carrier system 60. The illustrated actuator system 30 may include at least one electromagnetic actuator (i.e., an excitation coil) connected to the measuring tube magnet. A magnetic interaction occurs, and the device is configured to cause the measuring tube 12 to vibrate. The same electromagnetic actuator or another electromagnetic actuator can be used with the calibration tube magnet. A magnetic effect occurs, and it is configured to cause the calibration tube 22 to vibrate. In the illustrated embodiment, the measuring tube magnet... Arranged on the measuring tube 12, and the calibration tube magnet The exciter system 30 can be arranged on the calibration tube 22. Alternatively, the exciter system 30 can include an exciter coil arranged on the calibration tube 22 and an exciter magnet attached to the measurement tube 12, each arranged in such a way that they magnetically interact with each other when the measurement tube 12 is arranged. Similarly, the sensor system 40 can include one or two sensor coils or attached sensor coils arranged on the calibration tube 22, and one or two sensor magnets or attached sensor magnets arranged on the measurement tube 12, each arranged in such a way that they magnetically interact with each other when the measurement tube 12 is arranged on the support system 60. In this case, the support system 60 is not necessary.

[0099] The sensor system 40 may include at least one electrodynamic, electromagnetic, or optical sensor. In the illustrated embodiment, the sensor system 40 has sensor coils that interact with the measuring tube magnet 12' and the calibration tube magnet 22'. Alternatively, the sensor system may include two sensor coils spaced apart from each other, positioned in or on the support system 60 such that the excitation coil is located between them. The measuring tube magnet 12' is positioned relative to the measuring tube magnet in the longitudinal direction of the measuring tube 12. The calibration tube magnet 22' is offset from the calibration tube magnet in the longitudinal direction of the calibration tube 22. It is offset on the calibration tube 22.

[0100] Measurement and calibration electronics 50 are electrically connected to both the exciter system 30 and the sensor system 40, and are configured to cause both the measuring tube 12 and the calibration tube 22 to oscillate via the exciter system 30, and to determine the oscillation via the sensor system 40. Furthermore, the measurement and calibration electronics 50 is configured to determine at least one calibration variable of the overall system formed by the measuring system 10 and the calibration system 20, based on the oscillations of both the measuring system 10 (particularly the measuring system conveying the measuring medium) and the calibration system 20 conveying the calibration medium, as determined by the sensor system 40, particularly in the case where the calibration medium is conveyed in the calibration system 20 at a predetermined (reference) mass flow rate and / or a predetermined (reference) density and / or a predetermined (reference) viscosity.

[0101] In the illustrated embodiment, the measurement and calibration electronics 50 is arranged on the carrier system 60. Alternatively, it may be arranged in a separate transmitter housing, separate from the carrier system 60.

[0102] Furthermore, the measurement and calibration electronics 50 is configured to, particularly when the measurement medium flows in the measurement system 10, determine the mass flow rate, medium density, and / or medium viscosity of the measurement medium conveyed in the measurement system 10 based on the oscillations of both the measurement system 10 (particularly the measurement system through which the measurement medium flows) and the calibration system 20 (particularly the calibration system that conveys the calibration medium) determined by the sensor system 40, according to the at least one calibration variable and / or a variable derived from the at least one calibration variable.

[0103] The measurement system 10 and the calibration system 20 are configured to be flowed through by the measurement medium or the calibration medium independently of each other, in particular, such that the measurement medium and the calibration medium flow through the Coriolis flow measurement device 1 simultaneously at a biased mass flow rate and / or flow through the Coriolis flow measurement device 1 at different times.

[0104] The calibration system 20 also includes a pump 24 configured to pump the calibration medium through the calibration line 21 at a predetermined or predeterminable mass flow rate, specifically such that the mass flow rate of the calibration medium is equal to the mass flow rate of the measurement medium and / or the mass flow rate of the calibration medium corresponds to a target mass flow rate determined based on the oscillations of the measurement system 10 conveying the measurement medium and the calibration system 20 conveying the calibration medium, as determined by the sensor system 40.

[0105] The measuring system 10 has a measuring fastening device 25, by which the measuring tube 12 can be attached (particularly radially) to the calibration tube 22 for assembly and can be mechanically detachably connected to the calibration tube 22. Fastening devices for forming form-fit and / or force-fit connections are suitable as the measuring fastening device 25. Examples are disclosed in WO2019017891 A1, DE 102020114519 A1 and DE 102020127356 A1.

[0106] The above description of the measurement and calibration electronic equipment 50 also applies to the following embodiments.

[0107] Figure 3A schematic diagram of a second embodiment of a Coriolis flow measurement device 1 according to the present invention is shown. This Coriolis flow measurement device 1 is used to determine the mass flow rate, density, and / or viscosity of a fluid measurement medium (particularly a liquid) in a conventional process pipeline. It includes a measurement system 10, a calibration system 20, a (“combined”) exciter system 30 for exciting mechanical oscillations, a (“combined”) sensor system 40 for detecting mechanical oscillations, and a carrier system 60. The carrier system 60 can be connected to the calibration tube 22 in a mechanically non-removable or mechanically removable manner. In the illustrated embodiment, the measurement line 11 and the measurement tube 12 are part of a process pipeline.

[0108] The calibration system 20 has a calibration fastening device 23, by which the calibration tube 22 can be attached (particularly radially) to the measuring tube 12 or the process line, and can be mechanically detachably connected to the measuring tube 12 or the process line. As a result, the carrier system 60 can also be at least indirectly connected to the measuring system 10, particularly to the measuring tube 12, in a mechanically detachable manner.

[0109] In the illustrated embodiment, the actuator system 30 includes a mechanical actuator that mechanically interacts with the measuring tube 12 if the calibration system 20 is mechanically connected to the measuring line 11, and continuously interacts with the calibration tube 22 if the actuator system is permanently connected to the calibration tube 22. The sensor system 40 includes at least one electrodynamic or optical sensor configured to detect vibrations in the measuring tube 12 and the calibration tube 22.

[0110] The embodiment shown is a clamp-on solution that can be placed on an existing process line or hose system and is configured to not only determine the process variables of the measurement medium flowing through the process line or hose system, but also calibrate the measurement points.

[0111] Figure 4 A third embodiment of the Coriolis flow measurement device 1 according to the invention is shown. In the illustrated embodiment, the measuring tube 12 and the calibration tube 22 are mechanically connected to each other by at least one mechanical coupler 71, particularly in a non-removable manner. The measuring tube 12 has at least one resonant frequency equal to the resonant frequency of the calibration tube 22, particularly in such a way that the resonant frequency of the first-order bending oscillation mode inherent in the measuring tube 12 is equal to the resonant frequency of the first-order bending oscillation mode inherent in the calibration tube 22. Furthermore, the illustrated measuring tube 12 and the calibration tube 22 are matched in one or more geometric parameters (particularly (tube) length and / or (tube) wall thickness and / or diameter). In the illustrated embodiment, the measuring tube 12 and the calibration tube 22 are identical in construction.

[0112] The measuring tube 12 and the calibration tube 22 form a tube module designed for single use. This tube module is mechanically detachable from and can be attached to the support system 60 and / or the measuring line 11 and / or the calibration line. In the attached state, the tube module, or its measuring tube 12, is connected to the measuring line 11, through which the measured medium to be monitored can be introduced into and discharged from the measuring tube 12. In the attached state, the calibration tube 22 is also connected to the calibration line 21, through which the calibration medium can be introduced into and discharged from the calibration tube 22. The support system 60 includes a support fastening device (not shown) through which the measuring tube 12 and / or the calibration tube 22 or the tube module can be mechanically detachably attached to the support system 60. Suitable support fastening devices are disclosed in DE 102020114519 A1 and DE 102020127356 A1.

[0113] Figure 5a A schematic diagram of the calibration process is shown, and Figure 5b A schematic diagram of the measurement process of the Coriolis flow measurement device is shown. The method according to the present invention for calibrating and / or operating the Coriolis flow measurement device 1 includes the following steps:

[0114] The calibration medium is delivered through calibration line 21. Suitable calibration media include water (especially distilled water), glycerin, or oil. However, no measurement medium is present in measurement tube 12 during calibration. Alternatively, measurement medium, particularly stationary measurement medium, may be present in measurement tube 12 during calibration. Calibration is performed if the calibration medium flows at a predetermined mass flow rate. The predetermined mass flow rate of the calibration medium can be set, for example, by a pump, in such a way that the mass flow rate of the calibration medium corresponds to a predetermined target mass flow rate and / or is equal to the mass flow rate of the measurement medium delivered in measurement line 11.

[0115] For calibration, the calibration tube 22 and measuring tube 12 are oscillated by the exciter system 30. Furthermore, the oscillations of the calibration tube 22 and measuring tube 12 are detected by the sensor system 40 to determine the calibration variables of the overall system comprising the measuring system 10 and the calibration system 20. Once (re)calibration is complete, the predetermined mass flow rate of the calibration medium can be maintained or stopped. Alternatively, no calibration medium may be present in the calibration tube 22 during the determination of the mass flow rate, density, and / or viscosity of the measuring medium.

[0116] Once the calibration variables have been determined, the measurement medium, containing the mass flow rate, medium density, and / or medium viscosity to be monitored, is supplied through measurement line 11 (see measurement line 11). Figure 5bThe calibration line 21 and the measurement line 11 are oscillated by the exciter system 30. Since the calibration variables are known, the mass flow rate, density, and / or viscosity of the measured medium can be determined based on the detection signal determined by the sensor system 40 and the determined calibration variables.

[0117] The measuring medium and calibration medium are selected for at least one material parameter (particularly density and / or viscosity) such that they are matched, particularly in such a way that the measuring medium is used as the calibration medium, or the calibration medium corresponds to the measuring medium. This can be achieved, for example, by a bypass through which the measuring medium is delivered from the process line to the calibration line and used as the calibration medium in the calibration line.

[0118] Alternatively, the measuring medium and the calibration medium differ from each other in at least one material parameter (particularly density and / or viscosity).

[0119] Figure 6 A modular Coriolis flow measurement device is shown (see Figure 4 A perspective view of the modular Coriolis flow measurement device. The modular Coriolis flow measurement device includes a pipe module M2 and a base module M1. The base module M1 includes a (protective) housing 111 having at least one chamber at least partially surrounded by a housing wall 111+. The tube module M2 can be arranged in the chamber in a manner that is both mechanically fixed and mechanically removable. The vibration measurement sensor or vibration electronic measurement system is formed in the middle, and / or the vibration electronic module M2 is locked in the basic module M1 or arranged in a non-movable manner.

[0120] In the chamber of the protective shell At least one electrical excitation coil 112 (particularly an electrical excitation coil designed as cylindrical and / or designed as an air-core coil) is housed inside, which is at least indirectly mechanically connected to the housing wall 111+ and electrically connected to the measurement and calibration electronics ME. The illustrated embodiment has two excitation coils arranged opposite each other in the chamber 111, configured to excite the vibration of the tube module M2. Furthermore, at least two electrical sensor coils 114, 116 (which are particularly housed within the chamber of the (protective) housing 111) are also present. Inside, particularly cylindrical and / or hollow coils (and / or constructed identically to the electrically excited coil 112), are positioned particularly away from the first electrical coil and at least indirectly mechanically connected to the housing wall 111+. Electrical sensor coils 114 and 116 are electrically connected to the measurement and calibration electronics ME. The at least two sensor coils 114 and 116 are configured to detect vibrations of the tube module M2. The illustrated embodiment has a total of four sensor coils, which are arranged in pairs on opposite sides of the housing wall 111+.

[0121] Tube module M2 includes a measuring tube 131 for conveying the measuring medium and a calibration tube 132 for conveying the calibration medium. An excitation magnet 122 and two sensor magnets 124, 126 are positioned on the outer surface 131+ of the measuring tube 131 in such a manner that, in the arrangement of tube module M2 within the base module M1, these magnets interact with their respective associated excitation coils or sensor coils. An excitation magnet and two sensor magnets (covered by the calibration tube) are also positioned on the outer surface 132+ of the calibration tube 132 in such a manner that, in the arrangement of tube module M2 within the base module M1, these magnets interact with their respective associated excitation coils or sensor coils (not shown). The illustrated tube module M2, particularly the arrangement of the excitation and sensor magnets, is mirror-symmetric with respect to a longitudinal plane intersecting tube module M2 and extending between the measuring tube 131 and the calibration tube 132. The measurement and calibration electronics ME are configured to perform the method steps of the method according to the invention for calibrating and / or operating a Coriolis flow measurement device.

Claims

1. A Coriolis flow measurement device (1) for determining the mass flow rate, density, and / or viscosity of a fluid measurement medium in a process pipeline, said fluid measurement medium being, in particular, a liquid, said Coriolis flow measurement device comprising: - Measurement system (10). The measurement system (10) has a measurement pipeline (11) for conveying the measurement medium. The measuring system (10) has at least one measuring tube (12), particularly a sterile and / or detachably connected to the measuring line (11) and / or a measuring tube designed as a disposable product. - Calibration system (20) The calibration system (20) has a separate calibration line (21) for delivering a calibration medium, which is in particular water or glycerol, separate from the measurement line (11). The calibration system (20) includes at least one calibration tube (22), particularly a non-sterile calibration tube and / or a calibration tube arranged parallel to the measuring tube (12). - (Combined) exciter system (30), the (combined) exciter system being used to excite the mechanical oscillations of both the measurement system and the calibration system; - (Combined) sensor system (40), the (combined) sensor system being used to detect mechanical oscillations of both the measurement system and the calibration system; The actuator system (30) and the sensor system (40) are each detachably connected to the measurement system (10) and the calibration system (20), and in particular, the actuator system (30) and the sensor system (40) are each preferably detachably connected to the measurement system (10) and the calibration system (20). - and measurement and calibration electronic equipment (50). The measurement and calibration electronics (50) is electrically connected to both the actuator system (30) and the sensor system (40), and is configured to cause both the measuring tube (12) and the calibration tube (22) to oscillate via the actuator system (30), and to determine the oscillation of the measuring tube (12) and the calibration tube (22) via the sensor system (40). The measurement and calibration electronics (50) is configured to, particularly in the case of delivering the calibration medium in the calibration system (20) at a predetermined (reference) mass flow rate and / or predetermined (reference) density and / or predetermined (reference) viscosity, determine at least one calibration variable of the overall system formed by the measurement system (10) and the calibration system (20) delivering the calibration medium, based on the oscillations of both the measurement system (10) and the calibration system (20) delivering the calibration medium, as determined by the sensor system (40), wherein the measurement system (10) is particularly the measurement system delivering the measurement medium, and The measurement and calibration electronic device (50) is configured to: particularly when the measurement medium flows in the measurement system (10), particularly based on the oscillations of both the measurement system (10) through which the measurement medium flows and the calibration system (20) through which the calibration medium flows, as determined by the sensor system (40), determine the mass flow rate, medium density and / or medium viscosity of the measurement medium transported in the measurement system (10) according to the at least one calibration variable and / or a variable derived from the at least one calibration variable.

2. The Coriolis flow measurement device (1) according to claim 1. in, The actuator system (30) and the sensor system (40) are either each non-detachably connected to the measurement system (10) and detachable from the calibration system (20), or each non-detachably connected to the calibration system (20) and detachable from the measurement system (10), or each detachably connected to the calibration system (20) and detachable from the measurement system (10).

3. The Coriolis flow measurement device (1) according to any one of the preceding claims. in, The measurement system (10) and the calibration system (20) are configured to be flowed through the measurement medium or the calibration medium independently of each other, in particular, such that the measurement medium and the calibration medium flow through the Coriolis flow measurement device (1) simultaneously with a biased mass flow rate and / or flow through the Coriolis flow measurement device (1) at different times.

4. The Coriolis flow measurement device (1) according to any one of the preceding claims. in, The calibration system (20) includes a pump configured to pump the calibration medium through the calibration line (21) at a predetermined or predeterminable mass flow rate, in particular such that the mass flow rate of the calibration medium is equal to the mass flow rate of the measurement medium and / or the mass flow rate of the calibration medium corresponds to a target mass flow rate determined based on the oscillations of both the measurement system (10) delivering the measurement medium and the calibration system (20) delivering the calibration medium, as determined by the sensor system (40).

5. The Coriolis flow measurement device (1) according to any one of the preceding claims. in, The calibration system (20) has a calibration fastening device (23) by means of which the calibration tube (22) can be attached to the measuring tube (12) in particular radially for assembly and can be mechanically detachably connected to the measuring tube (12).

6. The Coriolis flow measurement device (1) according to any one of the preceding claims. in, The measurement system (10) has a measurement fastening device (25) by means of which the measurement tube (12) can be attached to the calibration tube (22) in particular radially for assembly and can be mechanically detachably connected to the calibration tube.

7. The Coriolis flow measurement device (1) according to any one of the preceding claims, comprising: - Bearing system (60) The actuator system (30) and the sensor system (40) are connected to the carrier system (60) in a non-detachable manner.

8. The Coriolis flow measurement device (1) according to claim 7. in, The measuring tube (12) and the calibration tube (22) are mechanically connected to each other in a non-detachable manner, forming a tube module. The tube module can be mechanically detached and arranged on the support system (60).

9. The Coriolis flow measurement device (1) according to claim 7 or 8. in, The support system (60) has a support fastening device through which the measuring tube (12) and / or the calibration tube (22) can be mechanically detachably connected to the support system (60).

10. The Coriolis flow measurement device (1) according to any one of the preceding claims. in, The actuator system (30) includes a mechanical actuator that mechanically interacts with the measuring tube (12) and the calibration tube (22).

11. The Coriolis flow measurement device (1) according to any one of the preceding claims. in, The actuator system (30) includes an electromagnetic actuator, which is connected to a measuring tube magnet ( ) and calibration tube magnet ( ) Magnetic interaction occurs, Among them, the measuring tube magnet ( ) is arranged on the measuring tube (12), Among them, the calibration tube magnet ( ) are arranged on the calibration tube (22).

12. The Coriolis flow measurement device (1) according to any one of the preceding claims. in, The sensor system (40) includes at least one electric, electromagnetic, or optical sensor.

13. The Coriolis flow measurement device (1) according to any one of the preceding claims. in, The measuring tube (12) and the calibration tube (22) are mechanically coupled to each other, in particular, by means of a mechanical coupler (71).

14. The Coriolis flow measurement device (1) according to any one of the preceding claims. in, The measuring tube (12) has at least one resonant frequency, which is equal to the resonant frequency of the calibration tube (22), particularly such that the resonant frequency of the inherent first-order bending oscillation mode in the measuring tube (12) is equal to the resonant frequency of the inherent first-order bending oscillation mode in the calibration tube (22); and / or The measuring tube (12) and the calibration tube (22) are matched in terms of one or more geometric parameters, particularly the tube length and / or tube wall thickness and / or diameter.

15. The Coriolis flow measurement device (1) according to any one of the preceding claims. in, The wall of the measuring tube (12) is made of metal, particularly stainless steel; and / or The wall of the calibration tube (22) is made of metal, particularly stainless steel; and / or The wall of the calibration tube (22) is made of the same material as the wall of the measuring tube (12); and / or The measuring tube (12) and the calibration tube (22) are identical in construction.

16. The Coriolis flow measurement device (1) according to any one of the preceding claims. in, The measuring tube (12) is part of the measuring line (11).

17. The Coriolis flow measurement device (1) according to any one of the preceding claims. in, The calibration tube (22) is part of the calibration pipeline (21), and in particular, is an integral part of it.

18. The Coriolis flow measurement device (1) according to any one of the preceding claims. in, The calibration medium is different from the measurement medium.

19. A method for calibrating and / or operating a Coriolis flow measurement device (1), particularly a Coriolis flow measurement device (1) according to any one of the preceding claims, in, The Coriolis flow measurement device (1) includes a measurement and calibration electronics (50), a (combined) sensor system (40), a (combined) actuator system (30), a measurement system (10), and a calibration system (20). The measurement system (10) has a measurement line (11) for conducting the measurement medium, and the calibration system (20) has a calibration line (21) separate from the measurement line (11) for conducting the calibration medium. The method includes the following steps: - Conduct the calibration medium through the calibration line (21). - If the calibration medium flows through the calibration line (21) at a predetermined mass flow rate, then calibration is performed. The calibration includes oscillation of the calibration line (21) and the measurement line (11) by stimulating the actuator system (30). The calibration includes measuring the oscillations of the calibration tube (22) and the measuring tube (12) using the sensor system (40). The calibration includes determining at least one calibration variable based on the measured oscillations for the overall system consisting of the measurement system (10) and the calibration system (20) using the measurement and calibration electronics (50); - Conduct the measuring medium through the measuring pipeline (11); - And determine the mass flow rate, density and / or viscosity of the measured medium based on the determined calibration variables.

20. The method according to claim 19, in, During calibration, the measuring medium is not present in the measuring tube (12).

21. The method according to claim 19, in, During calibration, the measuring tube (12) carries the measuring medium, particularly the stationary measuring medium.

22. The method according to any one of claims 19 to 21, in, During the determination of the mass flow rate, density and / or viscosity of the measured medium, the calibration tube (22) is not in the calibration medium.

23. The method according to any one of claims 19 to 22, in, During the determination of the mass flow rate, density and / or viscosity of the measured medium, the calibration tube (22) carries the calibration medium, particularly the flowing calibration medium.

24. The method according to any one of claims 19 to 23, further comprising: - In particular, the mass flow rate of the calibration medium is set by a pump such that the mass flow rate of the calibration medium corresponds to a predetermined target mass flow rate and / or is equal to the mass flow rate of the measurement medium (transported in the measurement line (11)); and / or - In particular, the pump is used to set the mass flow rate of the calibration medium while the measuring line (11) is delivering the measuring medium and / or while no measuring medium is flowing in the measuring line (11).

25. The method according to any one of claims 19 to 24, in, The measuring medium and the calibration medium are matched in terms of at least one material parameter, in particular such that the measuring medium is used as the calibration medium or the calibration medium corresponds to the measuring medium, the at least one material parameter being in particular density and / or viscosity.

26. The method according to any one of claims 19 to 25, in, The measuring medium and the calibration medium differ from each other in at least one material parameter, particularly density and / or viscosity.

27. The method according to any one of claims 19 to 26, in, The calibration medium contains water, specifically (distilled) water; and / or The calibration medium contains glycerol; and / or The calibration medium may contain oil or oil.

28. The method according to any one of claims 19 to 27, further comprising: - While the measuring medium is being delivered through the measuring line (11), and particularly while the measuring medium is flowing through the measuring line, the calibration line (21) and the measuring line (11) are oscillated by the exciter system (40).

29. The method according to any one of claims 19 to 28, in, The calibration medium is different from the measurement medium.

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