DE102019133459A1 - Sensor of a measuring device for detecting a mass flow rate, a viscosity, a density and / or a variable derived therefrom of a flowable medium - Google Patents

Abstract

The invention relates to a measuring transducer (1) of a measuring device (2) for detecting a mass flow rate, a viscosity, a density and / or a variable derived therefrom of a flowable medium, comprising: , 4) for guiding the flowable medium; - at least one vibration exciter (5) which is designed to excite the measuring tubes (3, 4) to vibrate; - at least one vibration sensors (6) which are designed to deflect the vibrations to detect at least one measuring tube (3, 4); and a coupler element (7) which mechanically connects at least two measuring tubes (3, 4) to one another, the coupler element (7) having a first end face (8) and a second end face (9), the coupler element (7) having two openings (10, 11) which each extend from the first end face (8) to the second end face (9) and through which one of the at least two measuring tubes (3, 4) runs; characterized in that the coupler element (7) by means of an adhesive connection is connected to the measuring tubes (3, 4).

Description

The invention relates to a sensor of a measuring device for detecting a mass flow, a viscosity, a density and / or a variable derived therefrom of a flowable medium, a measuring device for detecting a mass flow, a viscosity, a density and / or a variable derived therefrom of a flowable medium and a method for producing a measuring transducer of a measuring device for detecting a mass flow rate, a viscosity, a density and / or a variable derived therefrom of a flowable medium

Field devices in process measurement technology with a sensor of the vibration type and, in particular, Coriolis flow meters have been known for many years. The basic structure of such a measuring device is, for example, in the EP 1 807 681 A1 described, reference being made in full to the structure of a generic field device within the scope of the present invention in this document. This measuring technology and corresponding measuring devices were also extensively described by the applicant in numerous other patent applications.

Typically, Coriolis flow measuring devices have at least one or more oscillatable measuring tubes, which can be made to oscillate by means of a vibration exciter. These vibrations are transmitted over the length of the pipe and are varied by the type of flowable medium in the measuring pipe and its flow rate. A vibration sensor or, in particular, two vibration sensors that are spaced apart from one another can record the varied vibrations in the form of a measurement signal or a plurality of measurement signals at another point on the measuring tube. An evaluation unit can then determine the mass flow rate and / or the density and / or the viscosity of the medium from the measurement signal or signals.

Corresponding vibration exciters and / or vibration sensors are mostly based on an electrodynamic principle and are mostly constructed in several parts. They comprise a magnetic device for generating a magnetic field and a coil penetrated by this magnetic field. This coil is usually made of wire and is wound on a bobbin, typically a cylindrical bobbin. This technology has basically proven itself. Alternatively, the coils can also each be designed as a semiconductor flat coil.

Furthermore, conventional measuring sensors have coupling elements that connect the measuring tubes in the inlet and outlet areas. Such coupling elements are used to form a coupled oscillator from the separate measuring tubes.

It is state of the art to connect the coupling elements to the usually metallic measuring tubes via a soldered connection (see DE 10 2014 119 427 A1 and U.S. 5,370,002 ).

However, there are sensors of Coriolis measuring devices known which have non-metallic measuring tubes (e.g. US 2019/0137376 A1 and US 10,209,113 B2 ). For such measuring tubes, a soldered connection is either not suitable or can only be implemented in a complex manner.

The invention is based on the object of providing an alternative connection option for coupler elements on measuring tubes, which is suitable for a large number of measuring tubes made of different materials.

The object is achieved by the measuring sensor according to claim 1, the measuring device according to claim 9 and the method for producing the measuring sensor according to claim 10.

• - mindestens zwei insbesondere baugleiche und/oder zueinander parallel verlaufende Messrohre zum Führen des fließfähigen Mediums;
• - mindestens einen Schwingungserreger, welcher dazu eingerichtet ist, die Messrohre zu Schwingungen anzuregen;
• - mindestens einen Schwingungssensoren, welche dazu eingerichtet sind, die Auslenkung der Schwingungen mindestens eines Messrohrs zu erfassen; und
• - ein Kopplerelement, welches mindestens zwei Messrohre mechanisch miteinander verbindet,

wobei das Kopplerelement eine erste Stirnseite und eine zweite Stirnseite aufweist,
wobei das Kopplerelement zwei Öffnungen aufweist, die sich jeweils von der ersten Stirnseite zur zweiten Stirnseite erstrecken und durch die jeweils eins der mindestens zwei Messrohre verläuft;
und ist dadurch gekennzeichnet,
dass das Kopplerelement mittels einer Klebeverbindung mit den Messrohren verbunden ist.The inventive sensor of a measuring device for detecting a mass flow rate, a viscosity, a density and / or a variable derived therefrom of a flowable medium comprises:

• - At least two, in particular structurally identical and / or mutually parallel measuring tubes for guiding the flowable medium;
• - At least one vibration exciter, which is set up to excite the measuring tubes to vibrate;
• - At least one vibration sensors which are set up to detect the deflection of the vibrations of at least one measuring tube; and
• - a coupler element which mechanically connects at least two measuring tubes to one another,

wherein the coupler element has a first end face and a second end face,
wherein the coupler element has two openings which each extend from the first end face to the second end face and through which one of the at least two measuring tubes runs in each case;
and is characterized by
that the coupler element is connected to the measuring tubes by means of an adhesive connection.

As a result, a connection between the coupler element and the measuring tube can be realized A sufficient connection is also guaranteed for measuring tubes made of glass, ceramic and plastic, and surprisingly only ensures minimal damping of the vibrating measuring tubes.

Such a configuration is particularly advantageous for non-metallic measuring tubes, in particular for measuring tubes made of glass and / or plastic.

One embodiment provides that an opening and a measuring tube which runs through the opening form an annular gap,
wherein the annular gap has an adhesive which forms the adhesive connection and is preferably completely filled with the adhesive.

The adhesive connection is realized by an adhesive which is applied between the outer casing of the measuring tube and the outer surface of the opening of the coupler element and which has an adhesive effect.

The coupler element has an opening through which the measuring tube runs. The casing of the measuring tube, the outer surface of the opening, which is at least partially a through hole, and the two end faces delimit an annular gap which runs essentially coaxially to a longitudinal axis of the measuring tube. In conventional measuring sensors, this annular gap is filled with hard solder when the coupler element is soldered to the measuring tube.

The thickness of the annular gap is preferably to be kept as small as possible, since the coupling between the measuring tubes decreases with increasing thickness of the annular gap and thus also with increasing volume of adhesive.

One embodiment provides that the coupler element has a hole in which the adhesive extends,
wherein the hole is connected to the annular gap.

The hole takes on the function of a filling opening for the adhesive and bypasses the cumbersome lateral introduction of the adhesive into the annular gap.

The hole is designed as a through hole and extends from a side surface of the coupler element to the annular gap. When applying the adhesive, make sure that the adhesive fills the entire hole and the entire annular gap.

One embodiment provides that the adhesive forms a meniscus between the measuring tube and the coupler element.

und bevorzugt $L\ge \frac{1}{2}\cdot Ø$

gilt.One embodiment provides that a contact surface between the adhesive and the measuring tube with an outside diameter O or between the adhesive and the coupler element in the longitudinal direction of the measuring tube has a length L for which $\mathrm{L.}\ge \frac{1}{\mathrm{4th}}\cdot O$

and preferred $\mathrm{L.}\ge \frac{1}{2}\cdot O$

applies.

In order to achieve a sufficient connection between the coupler element and the measuring tube and to prevent the connection from loosening when the measuring tubes vibrate, it is advantageous if a minimum area, which corresponds to the contact area, is met when the adhesive is applied. The contact area typically corresponds to the surface area of a perpendicular circular cylinder, which is characterized by a length L. The length L is preferably at least as large as a quarter and preferably as a half of the outer diameter of the measuring tube.

One embodiment provides that the coupler element has a first area which has one of the two openings,
wherein the coupler element has a second region between the two openings,
wherein the second area in a geometric center has a lower modal flexural rigidity in the Y direction than the first area.

To reduce the mechanical stress at the interface between the coupler element and the measuring tube, it is advantageous if the coupler element has an area between the openings that has a lower modal flexural rigidity in the geometric center than the respective areas around the two openings.

The X-direction corresponds to the direction of oscillation of the measuring tubes, the Z-direction corresponds to the flow direction of the medium to be conveyed and the Y-direction is oriented perpendicular to the X-direction and Y-direction.

One embodiment provides that an average material thickness of the coupler element in the Z direction in the second area is less than the material thickness in the first area outside the openings.

As a result, a reduction in the modal flexural rigidity in the Y direction can be achieved in the second area. The second area of the coupler element thus takes on the function of a joint during rotational movements around the longitudinal axis, which leads to a reduction in the mechanical stress in the measuring tube and coupler element.

One embodiment provides that the second area is a depression or a continuous one Has hole which extends from the first end face to the second end face.

Another possibility to reduce the mechanical stress at the boundary areas of the measuring tube and coupler element, i.e. in the adhesive, is to make at least one depression or a continuous hole in the area between the openings. Excessive mechanical stress in the coupler element, measuring tube and adhesive leads to an increasing deterioration in the adhesive bond.

• - einen erfindungsgemäßen Messaufnehmer;
• - eine Mess- und/oder Betriebsschaltung,

wobei die elektronische Mess- und/oder Betriebsschaltung weiter dazu eingerichtet ist, Massedurchflussmesswerte, Viskositätswerte und/oder Dichtemesswerte und/oder Temperaturmesswerte und/oder Diagnosemesswerte und/oder Werte einer davon abgeleiteten Größe zu ermitteln und bereitzustellen.The measuring device according to the invention for detecting a mass flow rate, a viscosity, a density and / or a variable derived therefrom of a flowable medium comprises:

• - a measuring transducer according to the invention;
• - a measuring and / or operating circuit,

wherein the electronic measuring and / or operating circuit is further set up to determine and provide mass flow measured values, viscosity values and / or density measured values and / or temperature measured values and / or diagnostic measured values and / or values of a variable derived therefrom.

• - Einführen eines Messrohres in eine Öffnung eines Kopplerelementes;
• - Einbringen eines Klebemittels in ein Volumen, welches durch eine Außenfläche des Messrohres und einer Innenfläche der Öffnung begrenzt wird, insbesondere während das Messrohr um die Längsachse des Messrohres rotiert wird;
• - Aushärten lassen des Klebemittels und Bilden einer Klebeverbindung zwischen Kopplerelement und Messrohr.

The method according to the invention for producing a measuring sensor of a measuring device for detecting a mass flow rate, a viscosity, a density and / or a variable derived therefrom of a flowable medium, in particular the measuring sensor according to the invention, comprising the method steps:

• - Introducing a measuring tube into an opening of a coupler element;
• Introducing an adhesive into a volume which is delimited by an outer surface of the measuring tube and an inner surface of the opening, in particular while the measuring tube is being rotated about the longitudinal axis of the measuring tube;
• - Allow the adhesive to harden and form an adhesive bond between the coupler element and the measuring tube.

The adhesive can, for example, be introduced laterally into the annular gap. It has been found to be advantageous to rotate the measuring tube when the adhesive is introduced, so that the adhesive is evenly distributed on the measuring tube. This means that more reproducible glue connections can be implemented.

One embodiment provides that the coupler element has a hole which is connected to the volume.

The adhesive can easily be applied to the measuring tube and into the annular gap through a hole in the coupler element, which extends from a side surface to the annular gap. Rotating the measuring tube leads to a homogeneous distribution of the adhesive during application.

One embodiment provides that the adhesive is introduced into the volume by filling the adhesive into the hole.

It is advantageous if the adhesive is evenly distributed in the hole and essentially completely fills it, so that no free spaces are created. This can be achieved, for example, in that the adhesive is filled into the hole under pressure.

• 1: einen Ausschnitt einer perspektivische Ansicht auf einen erfindungsgemäßen Messaufnehmers, insbesondere auf ein ans Messrohr angeordnete Kopplerelement,
• 2: Längsschnitte dreier erfindungsgemäßer Ausgestaltungen des Kopplerelementes,
• 3: Draufsichten dreier weitere erfindungsgemäßer Ausgestaltungen des Kopplerelementes,
• 4: eine perspektivische Ansicht, einen Ausschnitt des Messaufnehmers und eine Seitenansicht eines gebogenen Zweirohr-Messgerätes,
• 5: eine Draufsicht und eine perspektivische Darstellung eines geraden Zweirohr-Messgerätes;
• 6: einen Ablauf einer Ausgestaltung des erfindungsgemäßen Verfahrens zur Herstellung eines Messaufnehmers.

The invention is explained in more detail with reference to the following figures. It shows:

• 1 : a section of a perspective view of a measuring sensor according to the invention, in particular of a coupler element arranged on the measuring tube,
• 2 : Longitudinal sections of three configurations of the coupler element according to the invention,
• 3rd : Top views of three further embodiments of the coupler element according to the invention,
• 4th : a perspective view, a section of the measuring transducer and a side view of a curved two-pipe measuring device,
• 5 : a plan view and a perspective illustration of a straight two-pipe measuring device;
• 6th : a sequence of an embodiment of the method according to the invention for producing a measuring transducer.

The 1 shows two measuring tubes 33 which, at least in the section shown, run straight and parallel to one another. Both measuring tubes are connected to one another via a coupling element.

The coupler element has an outer first area in which one of the two openings is arranged. There is a second area between the openings. In this embodiment, the second area has a taper which increases in the longitudinal direction. Starting from the openings, the material thickness is reduced in the direction of the geometric center. The geometric center lies in a transverse plane, which is also designed as a mirror plane. In the longitudinal section, the taper has the shape of an hourglass.

A hole is made in the area around the openings, which, starting from a side surface, extends into the annular gap. The hole and the annular gap are filled with an adhesive which also extends outside the annular gap in both longitudinal directions and thus has a contact surface defined by a characteristic length L. The adhesive forms a meniscus in the area of the annular gap.

The 2 shows longitudinal sections of three configurations of the coupler elements, which are each arranged on a measuring tube. For reasons of clarity, the measuring tube is shown solid. The coupler element of the first embodiment has an opening which, together with the casing of the measuring tube, form an annular gap. An adhesive is introduced into the annular gap. The adhesive is introduced from the side, from the front sides.

In addition to the features of the first embodiment, the coupler element of the second embodiment has two holes which each extend from a side surface, which in this case is common, to the annular gap and serve as a filling opening for the adhesive.

In addition to the features of the second embodiment, the coupler element of the third embodiment has a second area between the openings with a hole which serves to reduce the modal flexural rigidity in the Y direction of the geometric center of the second area.

The 3rd shows a plan view of a conventional plate-shaped coupler element and two embodiments according to the invention (from top to bottom). The conventional coupler element is cuboid or plate-shaped and has two openings for receiving the measuring tubes. Otherwise, the coupler element has the same material thickness throughout, except in the areas where the openings are arranged.

The first embodiment of the coupling element according to the invention has a second area in which the coupling carrier has a smaller cross section or a smaller material thickness. The second area has a cuboid base body. The material thickness thus changes in a step-like manner in the longitudinal direction.

The second embodiment of the coupler element also has a second area, like the first embodiment. The second area assumes the shape of an hourglass in a longitudinal section or, in the second area, the material thickness first decreases in the longitudinal direction and then increases again. All three shapes have a mirror plane running through the geometric center.

This in 4th The illustrated embodiment of a measuring device according to the invention comprises two parallel curved measuring tubes 110a , 110b located between an inlet-side collector 120a and a collector on the outlet side 120b extend, and are firmly connected to these, according to the invention by an adhesive connection. Between the collectors 120a , 120b a massive support tube extends 124 , which is firmly connected to both collectors, making the collectors 120a , 120b are rigidly coupled to each other. The carrier tube 124 has openings on its upper side 125a , 125b through which the measuring tubes 110a , 110b from the collectors from the carrier tube 124 out and back again. The measuring tubes 110a , 110b are each with two coupling elements on the inlet side and outlet side 132a , 134a , 132b , 134b Connected via an adhesive connection, the coupling elements each having a through hole between the measuring tubes 30th have, which is used to reduce the flexural rigidity in the Y direction of the geometric center in the second area between the two measuring tubes. The coupler elements 132a , 132b , 134a , 134b define vibration nodes for the measuring tubes. Between the inner coupler elements 132a , 132b can use the measuring tubes 110a , 110b vibrate freely, so that by the position of the inner coupler elements the vibration properties of the through the measuring tubes 110a , 110b formed oscillator, in particular natural frequencies of oscillation modes of the oscillator are significantly co-determined. The measuring tubes are made of glass or plastic.

In order to excite vibrations in relation to the longitudinal direction or the Z-axis, an exciter arrangement in the middle of the flow measuring device 100 between the measuring tubes 140 provided, for example an inductive exciter arrangement, which comprises, for example, a plunger coil on a measuring tube and a measuring tube opposite a plunger, or a magnet on the measuring tube and a semiconductor coil on the carrier tube. To record the vibrations, the measuring tubes are symmetrical to the exciter arrangement in the longitudinal direction 140 a first sensor arrangement 142a and a second sensor array 142b provided, which are each designed as an inductive arrangement with a plunger coil on one tube and an immersion body on the other tube. Details are known to the person skilled in the art and do not need to be explained in more detail here.

The collectors 120a , 120b have flanges at the end 122a , 122b by means of which the measuring device is to be installed in a pipeline. Through central openings 123b in the flanges is a Mass flow through the measuring device 100, in particular its pipelines 110a , 110b is to lead to measure the mass flow.

The measuring tubes 110a , 110b are each with two coupling elements on the inlet side and outlet side 132a , 134a , 132b , 134b connected, the coupler elements each having a hole between the measuring tubes 30th exhibit.

The 5 shows two views of a further embodiment of a measuring device according to the invention. The sensor shown 1 has a tubular, externally circular cylindrical housing 26th on which individual the sensor 1 forming components are housed protected from external environmental influences, such as dust or splash water. In the embodiment shown, the sensor comprises 1 two measuring tubes oriented parallel to each other 3rd , 4th . An inlet-side first housing end is by means of an inlet-side first flow divider 20 ₁ and an outlet-side second housing end is by means of an outlet-side second flow divider 20 ₂ educated. Each of the two flow dividers 20 ₁ , 20 ₂ In the embodiment shown, it has exactly two flow openings, each spaced apart from one another, for example circular-cylindrical or conical or each designed as an inner cone 20 _1A , 20 _1B on.

For guiding the at least temporarily through the pipeline and measuring sensor 1 The measuring sensor according to the invention comprises the flowing medium 1 furthermore at least two in the housing 26th straight measuring tubes, which are mounted so as to vibrate, parallel to each other 3rd , 4th that communicate with the pipeline during operation and are at least temporarily excited and allowed to vibrate in at least one vibration mode suitable for determining the physical measured variable. Of the at least two essentially circular cylindrical measuring tubes parallel to one another and to the above-mentioned central tube segment of the housing 3rd , 4th open a first measuring tube 3rd with a first measuring tube end on the inlet side into a first flow opening 20 _1A of the first flow divider 20 ₁ and with an outlet-side second measuring tube end into a first flow opening of the second flow divider 20 ₂ and a second measuring tube 4th with a first measuring tube end on the inlet side into a second flow opening 20 _1B of the first flow divider 20 ₁ and with an outlet-side second measuring tube end into a second flow opening of the second flow divider 20 ₂ . The two measuring tubes 3rd , 4th are thus forming a pipe arrangement with two flow paths connected in parallel to the flow dividers, in particular structurally identical 20 ₁ , 20 ₂ connected, specifically in a way that allows vibrations, in particular bending vibrations, of the measuring tubes relative to one another as well as relative to the housing. It is also provided that the measuring tubes 3rd , 4th only by means of the flow divider 20 ₁ , 20 ₂ in the housing 26th are supported so that they can vibrate. No further mechanical connections are provided.

As a material for the measuring tube body of the measuring tubes 3rd , 4th is particularly suitable for titanium, zirconium or tantalum. However, glass, ceramic or plastic also harmonize with the connection of the coupling elements according to the invention 24 ₁ , 24 ₂ , 24 ₃ , 24 ₄ to the measuring tube. The coupler elements 24 ₁ , 24 ₂ , 24 ₃ , 24 ₄ are disc-shaped and connected to the measuring tubes via an adhesive connection.

Ring elements 25 ₁ , 25 ₂ , 25 ₃ , 25 ₄ , 25 ₅ , 25 ₆ are essentially opposite one another and in the longitudinal direction of the sensor 1 spaced from each other on the measuring tube 3rd , 4th arranged. On the ring elements 25 ₁ and 25 ₂ is a vibration exciter 5 placed, which generated excitation force can cause torsional and bending vibrations of the measuring tubes with a fixed phase relationship with the same frequency. Such vibrations are detected by means of two vibration sensors which are spaced apart in the longitudinal direction 6th supervised. A vibration sensor is between the inlet and the vibration exciter 5 about the ring elements 25 ₃ , 25 ₄ on the measuring tubes 3rd , 4th attached. Another vibration sensor is between the outlet and the vibration exciter 5 about the ring elements 25 ₅ , 25 ₆ on the measuring tubes 3rd , 4th attached.

• - Einführen eines Messrohres 3, 4 in eine Öffnung 10, 11 eines Kopplerelementes 7;
• - Einbringen eines Klebemittels 14 in ein Volumen 32, welches durch eine Außenfläche 33 des Messrohres 3, 4 und einer Innenfläche 34 der Öffnung 10, 11 begrenzt wird, insbesondere während das Messrohr 3, 4 um die Längsachse des Messrohres 3, 4 rotiert wird, wobei das Kopplerelement 7 ein Loch 15, 16 aufweist, welches mit dem Volumen 32 verbunden ist, wobei das Einbringen des Klebemittels 14 in das Volumen 22 durch das Einfüllen des Klebemittels 14 in das Loch 15, 16 erfolgt;
• - Aushärten lassen des Klebemittels 14 und Bilden einer Klebeverbindung zwischen Kopplerelement 7 und Messrohr 3, 4.

The 6th shows individual steps of an embodiment of the method according to the invention for producing a measuring transducer 1 of a measuring device 2 for recording a mass flow rate, a viscosity, a density and / or a variable derived therefrom of a flowable medium:

• - Insertion of a measuring tube 3rd , 4th into an opening 10 , 11 a coupler element 7th ;
• - Introducing an adhesive 14th into a volume 32 , which by an outer surface 33 of the measuring tube 3rd , 4th and an inner surface 34 the opening 10 , 11 is limited, especially while the measuring tube 3rd , 4th around the longitudinal axis of the measuring tube 3rd , 4th is rotated, the coupler element 7th a hole 15th , 16 has which with the volume 32 is connected, the introduction of the adhesive 14th into the volume 22 by filling the adhesive 14th in the hole 15th , 16 he follows;
• - Let the adhesive harden 14th and forming an adhesive connection between the coupling element 7th and measuring tube 3rd , 4th .

List of reference symbols

1

Sensor

2

Measuring device

3

Measuring tube

4th

Measuring tube

5

Vibration exciter

6th

Vibration sensors

7th

Coupler element

8th

first face

9

second face

10

opening

11

opening

12th

Annular gap

13th

Annular gap

14th

Adhesive

15th

hole

16

hole

17th

Contact area

18th

first area

19th

second area

201

first flow divider

202

second flow divider

201A

first flow opening

201B

second flow opening

241

Coupler element

242

Coupler element

243

Coupler element

244

Coupler element

251

Ring element

252

Ring element

253

Ring element

254

Ring element

255

Ring element

256

Ring element

26th

casing

30th

Depression / hole

31

Measurement and / or operating circuit

32

volume

33

Outer surface of the measuring tube

34

Inner surface of the opening

110a

curved measuring tube

110b

curved measuring tube

120a

inlet-side collector

120b

External collector

122a

terminal flange

122b

terminal flange

123a

inlet

123b

Outlet

124

Support tube

125a

Opening in the top

125b

Opening in the top

132a

Coupler element

132b

Coupler element

134a

Coupler element

134b

Coupler element

140

Vibration exciter

142a

Vibration sensor

142b

Vibration sensor

146

Voice opening

O

outer diameter

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 1807681 A1 [0002]
• DE 102014119427 A1 [0006]
• US 5370002 [0006]
• US 2019/0137376 A1 [0007]
• US 10209113 B2 [0007]

Claims (12)

Measuring sensor (1) of a measuring device (2) for detecting a mass flow rate, a viscosity, a density and / or a variable derived therefrom of a flowable medium, comprising: - at least two measuring tubes (3, 4), in particular identical in construction and / or parallel to one another, for the Guiding the flowable medium; - At least one vibration exciter (5) which is set up to excite the measuring tubes (3, 4) to vibrate; - At least one vibration sensors (6) which are set up to detect the deflection of the vibrations of at least one measuring tube (3, 4); and - a coupler element (7) which mechanically connects at least two measuring tubes (3, 4) to one another, the coupler element (7) having a first end face (8) and a second end face (9), the coupler element (7) having two openings (10, 11) which each extend from the first end face (8) to the second end face (9) and through which one of the at least two measuring tubes (3, 4) runs; characterized in that the coupler element (7) is connected to the measuring tubes (3, 4) by means of an adhesive connection. Sensor after Claim 1 , wherein an opening (10, 11) and a measuring tube (3, 4) which runs through the opening (10, 11) form an annular gap (12, 13), the annular gap (12, 13) being an adhesive (14) which forms the adhesive connection, and is preferably completely filled with the adhesive (14). Sensor after Claim 2 wherein the coupling element (7) has a hole (15, 16) in which the adhesive (14) extends, the hole (15) being connected to the annular gap (12, 13). Sensor after Claim 2 and / or 3, the adhesive (14) forming a meniscus between the measuring tube (3, 4) and the coupler element (7). Sensor according to one or more of the preceding claims, wherein a contact surface (17) between the adhesive (14) and the measuring tube (3, 4) with an outer diameter Ø or between the adhesive (14) and the coupler element (7) in the longitudinal direction of the measuring tube (3, 4) has a length L for which $\mathrm{L.}\ge \frac{1}{\mathrm{4th}}\cdot O$

and preferred $\mathrm{L.}\ge \frac{1}{2}\cdot O$

applies. Measuring sensor according to one or more of the preceding claims, wherein the coupler element (7) has a first region (18) which has one of the two openings (10, 11), wherein the coupler element has a second region (19) between the two openings (10, 11), wherein the second area (19) in a geometric center has a lower modal flexural rigidity in the Y direction than the first area (18). Sensor after Claim 6 , wherein an average material thickness of the coupler element (7) in the Z direction in the second area (19) is less than the material thickness in the first area (18) outside the openings (10, 11). Sensor (1) Claim 6 and / or 7, wherein the second area (19) has a depression or a through hole (30) which extends from the first end face (8) to the second end face (9). Measuring device (2) for detecting a mass flow rate, a viscosity, a density and / or a variable derived therefrom of a flowable medium, comprising: - A measuring sensor (1) according to one of the preceding claims; - a measuring and / or operating circuit (31), wherein the electronic measuring and / or operating circuit (31) is further set up to determine and provide mass flow measured values, viscosity values and / or density measured values and / or temperature measured values and / or diagnostic measured values and / or values of a variable derived therefrom. Method for producing a measuring sensor (1) of a measuring device (2) for detecting a mass flow rate, a viscosity, a density and / or a variable derived therefrom of a flowable medium, in particular the measuring sensor (1) according to one of the Claims 1 to 8th , comprising the method steps: - inserting a measuring tube (3, 4) into an opening (10, 11) of a coupler element (7); - Introducing an adhesive (14) into a volume (32) which is delimited by an outer surface (33) of the measuring tube (3, 4) and an inner surface (34) of the opening (10, 11), in particular while the measuring tube (3 , 4) is rotated about the longitudinal axis of the measuring tube (3, 4); - Allow the adhesive (14) to harden and form an adhesive bond between the coupler element (7) and the measuring tube (3, 4). Procedure according to Claim 10 , wherein the coupling element (7) has a hole (15, 16) which is connected to the volume (32). Procedure according to Claim 10 and / or 11, the adhesive (14) being introduced into the volume (22) by filling the adhesive (14) into the hole (15, 16).

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