Modular coriolis flowmeter

Abstract

The invention relates to a modular Coriolis flowmeter comprising: - a measuring tube module (4), wherein the measuring tube module (4) has at least one measuring tube (3) for conducting a medium; at least one excitation magnet (36) on a vibration exciter for exciting the at least one measuring tube (3); at least one sensor magnet (38) on a vibration sensor for detecting vibrations of the at least one measuring tube (3), - a receiving module (16) having a receptacle (23) for receiving the measuring tube module (4), the receiving module (16) having at least one excitation coil (37) on a vibration exciter and at least one sensor coil (39) on a vibration sensor, the receiving module (16) comprising a receiving module body (22) which is at least partially comprised of a ferromagnetic material, the receiving module body (22) having at least one opening (79), a coil holder (109) for the excitation coil (37) and / or the sensor coil (39) being arranged in the at least one opening (79), the coil holder (109) comprising a coil holder body (110), the coil holder body (110) comprising an electrically insulating material.

Description

TECHNICAL FIELD

[0001] The present invention relates to a modular Coriolis flowmeter for determining a process variable of a flowable medium. BACKGROUND

[0002] Process measurement technology field devices with vibrating sensors, in particular Coriolis flowmeters, have been known for many years. The basic structure of such a measuring device is described, for example, in EP 1 807 681 A1, where, with regard to the structure of a generic field device within the scope of the invention, reference is made in full to this publication.

[0003] Generally, a Coriolis flowmeter has at least one or more vibratable measuring tubes, which can be set into vibration by a vibration exciter. The vibrations are transmitted along the length of the tube and vary depending on the type of flowable medium located in the measuring tube and its flow rate. At another point of the measuring tube, a vibration sensor, or in particular two mutually spaced vibration sensors, can record the varying vibrations in the form of a measurement signal or a plurality of measurement signals. An evaluation unit can then determine the mass flow rate, the viscosity and / or the density of the medium from the measurement signal.

[0004] Modular Coriolis flowmeters with replaceable disposable measuring tube modules are known. For example, a method for producing integrally formed measuring tube arrangements of Coriolis flowmeters with curved measuring tubes is taught in WO 2011 / 099989 A1, in which a measuring tube body for each measuring tube is first formed as a solid from a polymer and a channel for conducting a flowable medium is subsequently machined in the solid. WO 2011 / 099989 A1, like US 10,209,113 B2, teaches a connection body configured to receive and support a replaceable measuring tube module with a thin-walled plastic tube. The measuring tube module is fixed in the receiving module by the connection body, which is equipped with the necessary exciter and sensor. Modular Coriolis flowmeters, in which the exciter coil and the sensor coil are arranged on a metal housing and use exciter and sensor magnets, are susceptible to parasitic influences when measuring a process variable in the event of a change in the magnetic field. These influences cannot be fully compensated by factory adjustments. SUMMARY

[0005] It is an object of the present invention to solve this problem.

[0006] This object is achieved by a modular Coriolis flowmeter according to claim 1.

[0007] According to the invention, a modular Coriolis flowmeter for determining a process variable of a flowable medium comprises:

[0008] - a measuring tube module,

[0009] The measuring tube module includes at least one measuring tube for guiding the medium.

[0010] The measuring tube module has at least one excitation magnet on the vibration exciter for stimulating at least one measuring tube.

[0011] At least one excitation magnet is arranged on at least one measuring tube.

[0012] The measuring tube module has at least one sensor magnet on the oscillation sensor for detecting the oscillation of at least one measuring tube.

[0013] At least one sensor magnet is arranged on at least one measuring tube.

[0014] - Receiving module, having a container for receiving the measuring tube module.

[0015] The receiving module has at least one excitation coil on the vibration exciter, which has an excitation coil winding that has a magnetic effect with at least one excitation magnet.

[0016] The receiving module includes at least one sensor coil on the vibration sensor, which has a sensor coil winding that has a magnetic effect with at least one sensor magnet.

[0017] The receiving module includes a receiving module body, which at least partially comprises a conductive, particularly ferromagnetic, material.

[0018] The receiving module has an inner surface and an outer surface.

[0019] The receiving module body has at least one opening that extends from the inner surface to the outer surface.

[0020] A coil holder for the excitation coil and / or sensor coil is arranged in at least one opening.

[0021] The coil holder includes a coil holder body.

[0022] The coil holder body contains an electrically insulating material, particularly one formed of an electrically insulating material.

[0023] Wherein, the excitation coil winding has an excitation coil plane defined in the longitudinal direction of the coil, and / or the sensor coil winding has a sensor coil plane defined in the longitudinal direction of the coil.

[0024] The excitation coil plane and / or the sensor coil plane face the container.

[0025] Wherein, the excitation magnet has an excitation magnet end face facing at least one opening, and / or the sensor magnet has a sensor magnet end face facing at least one opening.

[0026] The coil holder body extends at least in the portion between the excitation coil plane and the excitation magnet end face, and / or at least in the portion between the sensor coil plane and the sensor magnet end face.

[0027] - Measurement and / or operation circuitry,

[0028] The measurement and / or operation circuit is configured to apply an excitation signal to at least one excitation coil.

[0029] The measurement and / or operation circuitry is configured to detect a sensor signal on at least one sensor coil.

[0030] A time-varying magnetic field generated by at least one excitation coil induces eddy currents in the conductive metal receiving module or the edge portion around the opening of the excitation coil. These eddy currents cause a zero-point displacement, which also depends on the density of the medium. A time-varying magnetic field generated by at least one sensor magnet also induces eddy currents within the receiving module body. This distorts the measurement signal related to mass flow rate, particularly the phase difference between two measurement signals measured on different sensor coils. Furthermore, the attenuation of the measurement signal increases. These parasitic effects can be compensated for by using an immersion coil (see U.S. Patent No. 5,602,345) or through precise factory adjustment. However, this is not possible in a modularly constructed Coriolis flowmeter with a replaceable measurement tube module. The advantage of a coil holder configuration is that the measurement tube module can be replaced, while the induction of eddy currents is minimized.

[0031] Advantageous embodiments of the present invention are the subject of the dependent claims.

[0032] One embodiment specifies that the excitation coil and / or sensor coil, in particular, each have a coil diameter d. S ,

[0033] At least one of the openings has an opening-side surface.

[0034] The minimum distance between the excitation coil and / or the sensor coil and the open-side surface is at least 1×d. S Especially at least 1.5×d S Preferably at least 2×d S .

[0035] One embodiment specifies that, in particular, the excitation magnet and / or the sensor magnet each have a magnetic diameter d. M ,

[0036] The measuring tube module is arranged in a container on the receiving module, such that the minimum distance between at least one excitation magnet and / or at least one sensor magnet, in particular, and the receiving module body, especially with respect to the open-side surface, exceeds 2 × d. M Especially at least 2.5×d M Preferably at least 3×d M .

[0037] One embodiment specifies that the coil retainer is arranged in at least one opening close to the fluid.

[0038] The advantage of this approach is that the container can be cleaned when the receiving module is installed in the biotechnology system.

[0039] One embodiment specifies that the coil retainer is inserted from the outer surface, and in particular, is secured to at least one opening.

[0040] One embodiment specifies that exactly one coil holder is arranged in at least one opening.

[0041] In this configuration, at least one excitation coil and at least one sensor coil are arranged on exactly one coil holder.

[0042] The advantages of the two developments mentioned above are simplified assembly. Furthermore, the reduced number of openings decreases the likelihood of leakage.

[0043] One embodiment specifies that the coil holder has a coil body for at least one excitation coil and / or a coil body for at least one sensor coil.

[0044] In this embodiment, at least one excitation coil is formed by an electrical conductor wound on a coil body of an excitation coil, and / or at least one sensor coil is formed by an electrical conductor wound on a coil body of a sensor coil.

[0045] The coil holder and the coil body are preferably integrally formed, and the excitation coil and / or sensor coil are formed by winding coil wire on the coil body.

[0046] One embodiment specifies that the coil holder body extends at least partially between an excitation coil plane and an end face of an excitation magnet, the excitation coil plane defining the excitation coil in the longitudinal direction of the coil, and / or at least partially between a sensor coil plane and an end face of a sensor magnet, the sensor coil plane defining the sensor coil in the longitudinal direction of the coil.

[0047] Preferably, the coil holder body is positioned relative to electronic components arranged on the outer surface of the receiving module body—such as measurement and / or operating circuitry—with respect to the container cover opening and the excitation coil and / or sensor coil.

[0048] One embodiment specifies that the coil holder has at least partially a material that is transparent to optical sensors, particularly temperature sensors.

[0049] The sensor is positioned outside the container on the main body of the receiving module.

[0050] The sensor is configured to determine further process variables through the transparent portion.

[0051] The transparent portion is preferably designed as a window flush against the coil holder. This allows optical temperature measurement to be performed from the side of the receiving module furthest from it. Another advantage of this is that the optical sensor is not exposed to cleaning agents or liquids.

[0052] One embodiment specifies that the coil holder at least partially comprises a material permeable to radio waves, particularly in the frequency range of 30 to 500 kHz.

[0053] The receiving module includes an RFID reader.

[0054] The measuring tube module includes an RFID transponder.

[0055] Metal casings have the property of shielding radio waves. However, to ensure error-free startup of the measuring tube module, it may be necessary to integrate the RFID reader into the readout module. Therefore, it has been found advantageous to design the coil holder, at least partially, in such a way that the RFID transponder attached to the measuring tube module can be read by the RFID reader on the receiving module. This can be achieved through gradients or by selecting suitable materials.

[0056] One embodiment specifies that the measuring tube module can be connected to the receiving module in a mechanically releasable manner, particularly in a form-fit and / or force-fit manner.

[0057] One embodiment specifies that the excitation coil and / or sensor coil are, in particular, at least partially embedded in a coil holder.

[0058] The advantage of this is that it greatly extends the lifespan of the excitation coil and / or sensor coil, because it is more difficult for moisture to enter the windings. Attached Figure Description

[0059] The invention will be explained in more detail with reference to the accompanying drawings. The drawings are shown below:

[0060] Figure 1 The measuring tube module is partially arranged in a container on the receiving module;

[0061] Figure 2 Side view of the receiving module in the first embodiment of the modular Coriolis flow meter;

[0062] Figure 3 Side view of the receiving module in the second embodiment of the modular Coriolis flow meter;

[0063] Figure 4 : A partial view of a cross-section through a first embodiment of the coil holder;

[0064] Figure 5 A partial view of a cross-section through a second embodiment of the coil holder; and

[0065] Figure 6 : A partial view of a cross section through a third embodiment of the coil holder. Detailed Implementation

[0066] Figure 1A perspective view of a modular Coriolis flow meter for pharmaceutical bioprocessing applications is shown. The Coriolis flow meter is a measuring device 2 used to detect the mass flow rate, viscosity, density, and / or variables arising therefrom of a flowable medium. The measuring tube module 4 is adapted to be inserted into the container 23 on the receiving module 16 so that it can be interchanged, i.e., mechanically inserted and detached. For this purpose, only the individual components of the vibration exciter and vibration sensor, in this case, the corresponding magnet devices 9.1 and 9.2, are attached to the measuring tube module 4. Magnet devices 9.1 and 9.2 include at least one excitation magnet and at least one sensor magnet. According to the described embodiment, each of the two magnet devices 9.1 and 9.2 includes exactly one excitation magnet and exactly two sensor magnets. Further components are arranged in the receiving module 16, particularly in the container 23—especially in the coil receiving device on the receiving module body—which is adapted and designed to receive the measuring tube module 4. The measuring tube module 4 includes two curved measuring tubes 3.1 and 3.2, parallel to each other, and interconnected by a coupler assembly 1 consisting of four coupler elements 6 and a fixed body assembly 5. Two coupler elements 6.1 are integrally joined in the inlet, and two other coupler elements 6.2 are integrally joined in the outlets of the respective measuring tubes 3.1 and 3.2. The measuring tubes 3.1 and 3.2 are shaped such that the flow direction in the inlet, indicated by two arrows, is oriented opposite to the flow direction in the outlet. Diverters with process connections for connecting hose and / or plastic tubing systems can be arranged separately in the inlet and outlet. According to one embodiment, instead of two separate diverters, a single diverter body can be provided, sliding onto the inlet and outlet, which also facilitates decoupling the measuring tube module 4 from the environment after installation into the receiving module 16. Each coupler element 6 is plate-shaped and designed as one or two parts. Coupler elements 6 may individually comprise the measuring tube completely or only partially. Measuring tubes 3.1 and 3.2 are U-shaped, meaning they each have two legs 11 that are substantially parallel to each other and connected by curved sections. Magnet devices 9.1 and 9.2 are arranged on each measuring tube 3.1 and 3.2. In the curved sections, magnets 10.1—particularly the excitation magnets of magnet device 9.1—are arranged and form components of a vibration exciter. In each of the two legs 11, an attachment magnet 10.2—particularly a sensor magnet—forms part of the vibration exciter. Magnets 10 are attached to attachment surfaces. In this embodiment, the attachment surfaces are located on the respective measuring tubes 3.1 and 3.2.

[0067] The measuring tube module 4 is partially inserted into the container 23 on the receiving module 16. The arrow indicates the direction of insertion. In this embodiment, the latter is perpendicular to the longitudinal direction of the container 23. The container can also be designed so that the measuring tube module 4 can be inserted in the longitudinal direction of the container (see...).Figure 2 A to Figure 2 C). The receiving module 16 has a measurement and / or operation circuit 15, which is connected to the vibration exciter and vibration sensor, particularly to the corresponding coil system, and is configured to generate and / or detect a time-varying spatiotemporally alternating magnetic field. The receiving module 16 has a receiving module body 22, in which a container 29 is located. The connecting body 5 for the measuring tube module 4 has a mounting surface 26 for arranging the measuring tube module 4 at a predetermined position in the receiving module 16. According to the described embodiment, the vertical plane of the mounting surface 26 is perpendicular to the longitudinal direction of the measuring tube module 4. According to another advantageous embodiment, the vertical plane of the mounting surface 26 points towards the longitudinal axis of the measuring tube module 4. The surface of the receiving module body 22 that contacts the mounting surface 26 of the connecting body 5 is a bearing surface 27.

[0068] The receiving module 16 has two side surfaces oriented parallel to each other and laterally defining the container 29 in the longitudinal direction of the container. Coil devices 25 on vibration sensors 8.1 and 8.2 and on vibration exciter 7 are arranged in the side surfaces. The coil devices 25 on vibration sensors 8.1 and 8.2 are arranged relative to the coil device 25 on vibration exciter 7 in the longitudinal direction of the container. All three coil devices 25 are located within a single coil plane. Furthermore, the three coil devices 25 are designed as plate-shaped coils and embedded in the side surfaces. The three coil devices 25 are arranged on the side surfaces substantially in such a way that they are opposite the corresponding magnet devices 9.1 and 9.2 when the measuring tube module 3 is installed. Corresponding guides are incorporated in the two side surfaces, extending perpendicular to the longitudinal direction of the container 29 and parallel to the coil plane. According to the described embodiment, the container extends on both end faces of the container 29. This allows the measuring tube module 4 to be inserted perpendicularly in the longitudinal direction of the measuring tube module 4. According to another embodiment, the container 23 extends on only one end face. In this configuration, the measuring tube module 4 is inserted into the receiving module 16 along the longitudinal direction of either the measuring tube module 4 or the receiving module 16. Each excitation coil has an excitation coil winding with a defined excitation coil plane in the longitudinal direction of the coil. Similarly, each sensor coil has a sensor coil winding including a sensor coil plane defined in the longitudinal direction of the coil. The excitation coil plane and / or the sensor coil plane face the container 23. The excitation magnet has an excitation magnet end face facing the excitation coil, and the sensor magnet has a sensor magnet end face facing the sensor coil. The excitation magnet end faces are spaced apart from the excitation coil plane, and so are the sensor magnet end faces from the sensor coil plane. Measurement and / or operation circuitry 15 is attached to the receiving module body 22 and configured to apply an excitation signal to the excitation coil and detect sensor signals on the sensor coil. Furthermore, an RFID transponder 115 with a data memory—containing specific data of the measuring tube module—is attached to the fixing body device 5 of the measuring tube module 4. The RFID transponder 115 can be read by an RFID reader. The RFID reader can be attached to the receiver module 16 or designed as a handheld device.

[0069] Figure 2A side view of a receiving module 16 in a first embodiment of a modular Coriolis flowmeter for determining process variables of a flowable medium is shown. The receiving module 16 has a container for receiving a measuring tube module. Furthermore, the receiving module 16 includes two excitation coils 37 on a vibration exciter, each having an excitation coil winding that has a magnetic effect with a corresponding exciter magnet on the measuring tube module. The excitation coils 37 are arranged on different side surfaces of the receiving module 16. Additionally, the receiving module 16 includes four sensor coils 39 on a vibration sensor, each having a corresponding sensor coil winding that has a magnetic effect with a corresponding sensor magnet. The receiving module 16 has a receiving module body 22, which at least partially comprises a conductive, particularly ferromagnetic, material. The receiving module body 22 has an inner surface, an outer surface, and an opening 79 extending from the inner surface to the outer surface. In the illustrated embodiment, the receiving module body 22 has two openings 79 on one side and a second further opening on the opposite side. Coil holders 109 for the excitation coils 37 and / or the two sensor coils 39 are arranged in each of the two openings. Each coil retainer 109 includes a coil retainer body 110 having an electrically insulating material, or being formed of an electrically insulating material such as plastic.

[0070] Figure 3 A side view of the receiving module 16 in a second embodiment of the modular Coriolis flowmeter is shown. The second embodiment differs from the first in that the receiving module 16 has only one opening 79 on each of its two opposing side surfaces for exactly one coil holder 109. An excitation coil 37 and two sensor coils 39 are arranged within the coil holder 109. Furthermore, an RFID reader 114 is arranged on the coil holder 109 to determine measurement tube-specific data stored in the data memory of an RFID transponder and an optical sensor 113, which optically detects the temperature or temperature-related variables of at least one measurement tube and / or the medium to be guided through a transparent portion 116 in the coil holder body 110.

[0071] Figure 4A partial cross-sectional view of a first embodiment of a coil holder 109 is shown, which is arranged and secured in an opening 79 from its outer surface via an opening-side surface 111. The opening-side surface 111 defines the opening 79 in the radial direction for the receiving module body 22. The coil holder 109 has a coil container 118 for the excitation coil 37 and / or the sensor coil 39. The coil holder 109 has a coil holder body 110 that extends at least partially between the excitation coil plane and the excitation magnet end face, and / or at least partially between the sensor coil plane and the sensor magnet end face. According to the illustrated embodiment, the coil holder body 110 fills the opening such that the excitation coil 37 and / or the sensor coil 39 are covered by the latter in the longitudinal direction. A sealant 117 is provided to allow the coil holder 109 to be arranged in the opening in a liquid-sealed manner. The coil diameter of the excitation coil 37 and / or the sensor coil 39 is d. S According to the present invention, the minimum distance between the excitation coil 37 and / or the sensor coil 39 and the opening-side surface 111 is at least 1×d. S Especially at least 1.5×d S Preferably at least 2×d S Furthermore, the magnetic diameter of the excitation magnet 36 and / or the sensor magnet 38 is d. M According to the invention, the measuring tube module is arranged in a container on the receiving module such that the minimum distance between the excitation magnet 36 and / or the sensor magnet 38 and the receiving module body, particularly with respect to the open-side surface, exceeds 2 × d. M Especially at least 2.5×d M Preferably at least 3×d M According to the development of the first embodiment, the coil holder 109 is an injection-molded part in which the excitation coil 37 and / or sensor coil 39 are at least partially embedded. The coil holder 109 also has at least partially circumferential and protruding edge portions that rest against the outside of the receiving module body 22.

[0072] Figure 5 A partial cross-sectional view through a second embodiment of the coil holder 110 is shown. The fundamental difference between the second embodiment and the first embodiment lies in the arrangement of the excitation coil 37 and / or sensor coil 39 within the coil holder body 110. The coil container in the first embodiment is replaced by a channel opening in which the excitation coil 37 and / or sensor coil 39 are arranged. A further sealant 117 is provided to seal the channel opening 119 against fluid from the container.

[0073] Figure 6A partial cross-sectional view through the coil holder 109 is shown. The fundamental difference between the third embodiment and the first embodiment is that the excitation coil 37 and / or sensor coil 39 are not arranged in a coil container. Instead of a coil holder, there is a coil body 112 integrally connected to the coil holder body 110 and used for winding coil wire to form the excitation coil 37 and / or sensor coil 39.

[0074] Reference tag list

[0075] Coupler device 1

[0076] Measuring device 2

[0077] Measurement line 3

[0078] Measuring tube module 4

[0079] Fixed main body device 5

[0080] Coupler element 6

[0081] Vibration exciter 7

[0082] Vibration sensor 8

[0083] Magnet device 9

[0084] Magnet 10

[0085] Leg 11

[0086] Measuring tube body 13

[0087] Measurement and / or operation circuit 15

[0088] Receiver module 16

[0089] Receiver module body 22

[0090] Container 23

[0091] Side surface 24

[0092] Mounting surface 26

[0093] Guide 28

[0094] Excitation magnet 36

[0095] Excitation coil 37

[0096] Sensor magnet 38

[0097] Sensor coil 39

[0098] Opening 79

[0099] Coil Holder 109

[0100] Coil holder body 110

[0101] Opening side surface 111

[0102] Coil body 112

[0103] Optical sensor 113

[0104] RFID reader 114

[0105] RFID transponder 115

[0106] Transparent incision 116

[0107] Sealant 117

[0108] Coil container 118

[0109] Channel opening 119

Claims

1. Modular Coriolis flowmeter for determining a process variable of a flowable medium, comprising: - a measuring tube module (4), wherein the measuring tube module (4) comprises at least one measuring tube (3) for guiding the medium, wherein the measuring tube module (4) has at least one excitation magnet (36) on a vibration exciter for exciting the at least one measuring tube (3), wherein the at least one excitation magnet (36) is arranged on the at least one measuring tube (3), wherein the measuring tube module (4) has at least one sensor magnet (38) on a vibration sensor for detecting vibrations of the at least one measuring tube (3), wherein the at least one sensor magnet (38) is arranged on the at least one measuring tube (3), - a receiving module (16) having a receptacle (23) for receiving the measuring tube module (4), wherein the receiving module (16) has at least one excitation coil (37) on the vibration exciter, the at least one excitation coil (37) having excitation coil windings having a magnetic effect on the at least one excitation magnet (36), wherein the receiving module (16) has at least one sensor coil (39) on the vibration sensor, the at least one sensor coil (39) having sensor coil windings having a magnetic effect on the at least one sensor magnet (38), wherein the receiving module (16) comprises a receiving module body (22), the receiving module body (22) at least partially having an electrically conductive material, wherein the receiving module body (22) has an inner side surface and an outer side surface, wherein the receiving module body (22) has at least one opening (79) extending from the inner side surface to the outer side surface, wherein a coil holder (109) for the excitation coil (37) and / or sensor coil (39) is arranged in the at least one opening (79), wherein the coil holder (109) comprises a coil holder body (110), wherein the coil holder body (110) has an electrically insulating material, wherein the excitation coil windings have an excitation coil plane delimited in the coil longitudinal direction and / or the sensor coil windings have a sensor coil plane delimited in the coil longitudinal direction, wherein the excitation coil plane and / or the sensor coil plane face the receptacle (23), wherein the at least one excitation magnet (36) has an excitation magnet end face facing the at least one opening (79) and / or the sensor magnet (38) has a sensor magnet end face facing the at least one opening (79), - a measuring and / or operating circuit (15), wherein the measuring and / or operating circuit (15) is configured to apply an excitation signal to the at least one excitation coil (37), wherein the measuring and / or operating circuit (15) is configured to detect a sensor signal on the at least one sensor coil (39), wherein the excitation coil (37) and / or the sensor coil (39) each have a coil diameter of d S . wherein the at least one opening (79) has an opening side surface (111), wherein the minimum distance of the excitation coil and / or the sensor coil to the opening side surface is at least 1 x d S .

2. The modular Coriolis flowmeter of claim 1, wherein the receiving module body (22) at least partially has an electrically conductive and ferromagnetic material.

3. The modular Coriolis flowmeter of claim 1, wherein the coil holder body (110) is formed of an electrically insulating material.

4. The modular Coriolis flowmeter of any one of claims 1 to 3, wherein the coil holder body (110) extends at least partially between the excitation coil plane and the excitation magnet end face and / or at least partially between the sensor coil plane and the sensor magnet end face.

5. The modular Coriolis flowmeter of claim 1, wherein The minimum distance of the excitation coil and / or the sensor coil from the opening side surface is at least 1.5 x d S .

6. The modular Coriolis flowmeter of claim 1, wherein The minimum distance of the excitation coil and / or the sensor coil to the opening side surface is at least 2 x d S .

7. The modular Coriolis flowmeter of claim 1, wherein The at least one excitation magnet (36) and / or the at least one sensor magnet (38) each have a magnetic diameter d M of 0.5 mm to 5 mm. wherein the measuring tube module (4) is arranged in the container (23) such that the minimum distance of the at least one excitation magnet (36) and / or the at least one sensor magnet (38) to the receiving module body (22) exceeds 2 x d M .

8. The modular Coriolis flowmeter of claim 7, wherein The measuring tube module (4) is arranged in the container (23) such that the minimum distance of the at least one excitation magnet (36) and / or the at least one sensor magnet (38) to the receiving module body (22) is at least 2.5 x d M .

9. The modular Coriolis flowmeter of claim 7, wherein The measuring tube module (4) is arranged in the container (23) such that the minimum distance of the at least one excitation magnet (36) and / or the at least one sensor magnet (38) to the receiving module body (22) is at least 3 x d M .

10. The modular Coriolis flowmeter of claim 7, wherein The measuring tube module (4) is arranged in the container (23) such that the minimum distance of the at least one excitation magnet (36) and / or the at least one sensor magnet (38) to the open side surface (111) exceeds 2 x d M .

11. The modular Coriolis flowmeter of claim 7, wherein, The measuring tube module (4) is arranged in the container (23) such that the minimum distance of the at least one excitation magnet (36) and / or the at least one sensor magnet (38) each to the open side surface (111) is at least 2.5 x d M .

12. The modular Coriolis flowmeter of claim 7, wherein, The measuring tube module (4) is arranged in the container (23) such that the minimum distance of the at least one excitation magnet (36) and / or the at least one sensor magnet (38) each to the open side surface (111) is at least 3 x d M .

13. The modular Coriolis flowmeter of any one of claims 1 to 3, wherein the coil holder (109) is arranged in the at least one opening (79) liquid-tightly.

14. The modular Coriolis flowmeter of any one of claims 1 to 3, wherein, the coil holder (109) is inserted into the at least one opening (79) from the outer side surface.

15. The modular Coriolis flowmeter of claim 14, wherein the coil holder (109) is fixed into the at least one opening (79) from the outer side surface.

16. The modular Coriolis flowmeter of any one of claims 1 to 3, wherein, exactly one coil holder (109) is arranged in the at least one opening (79), wherein the at least one excitation coil (37) and the at least one sensor coil (39) are arranged on the exactly one coil holder (109).

17. The modular Coriolis flowmeter of any one of claims 1 to 3, wherein the coil holder (109) has a coil body (112) for the at least one excitation coil (37) and / or a coil body (112) for the at least one sensor coil (39), wherein the at least one excitation coil (37) is formed by an electrical conductor winding on the coil body (112) and / or the at least one sensor coil (39) is formed by an electrical conductor winding on the coil body (112).

18. The modular Coriolis flowmeter of any one of claims 1 to 3, wherein the coil holder (109) at least partially contains a material transparent to optical sensors (113), wherein the optical sensor (113) is arranged outside the container (23) on the receiving module body (22), wherein the optical sensor (113) is configured to determine a further process variable through the transparent portion.

19. The modular Coriolis flowmeter of claim 18, wherein, the coil holder (109) at least partially comprises a material transparent to temperature sensors.

20. The modular Coriolis flowmeter of any one of claims 1 to 3, wherein, the coil holder (109) at least partially comprises a material transparent to radio waves, wherein the receiving module (16) comprises an RFID reader (114), wherein the measuring tube module (4) comprises an RFID transponder (115).

21. The modular Coriolis flowmeter of claim 20, wherein, the coil holder (109) at least partially comprises a material transparent to radio waves in a frequency range of 30 to 500 kHz.

22. The modular Coriolis flowmeter of any one of claims 1 to 3, wherein, the measuring tube module (4) is mechanically detachable from the receiving module (16).

23. The modular Coriolis flowmeter of the preceding claim 22, wherein the measuring tube module (4) is actively and / or passively connectable to the receiving module (16).

24. The modular Coriolis flowmeter of any one of claims 1 to 3, wherein the excitation coil (37) and / or the sensor coil (39) are at least partially embedded in the coil holder (119).

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