阅读说明：本技术 磁感应流量计 (Magnetic induction flowmeter ) 是由 弗兰克·沃伊特 斯特凡·齐格勒 海因茨·鲁费尔 于 2019-09-20 设计创作，主要内容包括：本发明涉及一种用于确定介质的流动速度和/或体积流量的磁感应流量计,包括：测量管,该测量管用于引导介质；磁场产生装置；以及至少一个电极组件,该至少一个电极组件以下述方式安装在测量管中：其形成与介质的电接触,其中电极组件具有电极主体,其中电极主体是触针形的并且具有端面,其特征在于,压力测量换能器与电极主体耦合,其中可将作用在端面上的压力施加于该压力测量换能器。(The invention relates to a magnetic induction flow meter for determining a flow velocity and/or a volume flow of a medium, comprising: a measuring tube for guiding the medium; a magnetic field generating device; and at least one electrode assembly mounted in the measurement tube in the following manner: which forms an electrical contact with the medium, wherein the electrode assembly has an electrode body, wherein the electrode body is contact-pin-shaped and has an end face, characterized in that a pressure measuring transducer is coupled to the electrode body, wherein a pressure acting on the end face can be applied to the pressure measuring transducer.)

1. A magnetic inductive flow meter for determining flow velocity and/or volumetric flow and pressure of a medium, comprising:

-a measuring tube (1), the measuring tube (1) being used for transporting the medium;

-magnetic field generating means (7); and

-at least one electrode assembly (10), the at least one electrode assembly (10) being mounted in the measuring tube (1) in the following manner: the at least one electrode assembly (10) forming an electrical contact with the medium,

wherein the electrode assembly (10) has an electrode body (11),

wherein the electrode body (11) is stylus-shaped and has a front end surface,

it is characterized in that the preparation method is characterized in that,

a pressure measuring transducer (12) is coupled to the electrode body (11),

wherein the pressure measuring transducer (12) is contactable with a pressure acting on the front end surface.

2. The flow rate measurement device of claim 1,

wherein the pressure measuring transducer (12) comprises a measuring membrane (13).

3. Flow measuring device according to one of the preceding claims,

wherein the electrode body (11) comprises a bore (15) leading to the measurement tube (1).

4. Flow measuring device according to one of the preceding claims,

wherein the holes (15) are channels and form an integrated pressure supply conduit for conveying the medium.

5. Flow measuring device according to one of the preceding claims,

wherein the end of the electrode body (11) is connected with the hollow body (14).

6. Flow measuring device according to one of the preceding claims,

wherein a housing (16) containing the pressure measuring transducer (12) is connected with the hollow body (14) by a material bond.

7. Flow measuring device according to one of the preceding claims,

wherein the electrical contacting of the electrode body (11) is carried out via the hollow body (14) and/or the housing (16).

8. Flow measuring device according to one of the preceding claims,

wherein the housing (16) comprises at least one contact device (18), via which contact device (18) the electrode assembly (10) is in electrical contact with a measurement and/or evaluation unit (9).

9. Flow measuring device according to one of the preceding claims,

wherein the magnetic field generating device (7) comprises at least one coil (23) and at least one coil core (24) positioned inside the coil (23),

wherein the coil core (23) is realized as a hollow cylinder,

wherein the electrode assembly (10) is positioned in an interior of the coil core (24).

10. Flow measuring device according to one of the preceding claims,

wherein the coil core (24) has an interior,

wherein an insulation (25) is provided between the interior and the housing (16).

11. Flow measuring device according to one of the preceding claims,

wherein the electrode body (11) comprises an electrode head (17),

wherein the electrode head (17) has a contour (20).

12. Flow measuring device according to one of the preceding claims,

wherein the electrode body (11) comprises a fill level monitoring electrode (5) and/or a reference electrode (6) and/or a measuring electrode (3, 4) for sensing a measuring voltage in the medium.

13. Flow measuring device according to one of the preceding claims,

wherein the electrode body (11) is realized as a pin electrode, a tip electrode or a mushroom electrode.

14. Flow measuring device according to one of the preceding claims,

wherein the electrode body (11) has a basic end shape (28), the basic end shape (28) being realized as a cone or a truncated cone,

wherein the hollow body (14) has a seat (29) for the electrode body (11), the seat (29) being realized complementary to the basic end shape (28) of the electrode body (11).

15. The flow measuring device of claim 14,

wherein the basic end shape (28) comprises a surface element (30) and a cone axis (31), the surface element (30) and the cone axis (31) together forming an angle phi_E，

Wherein said angle phi_EBetween 5 ° and 25 °.

Background

Magnetic inductive flow meters are used for determining the flow velocity and/or the volume flow of a medium in a measuring tube. The magnetically inductive flow meter comprises a magnetic field generating device which generates a magnetic field extending perpendicular to the transverse axis of the measuring tube. Usually one or more coils are used for this purpose. In order to implement a largely uniform magnetic field, the pole shoes are complementarily formed and placed such that the magnetic field lines extend substantially perpendicular to the transverse axis over the entire tube cross-section. Measuring electrodes applied at the lateral surfaces of the measuring tube sense an inductively generated electrical measuring voltage, which is generated when the electrically conductive medium flows in the direction of the longitudinal axis in the presence of the applied magnetic field. Since the recorded measured voltage depends on the velocity of the flowing medium according to faraday's law of induction, the flow velocity can be determined from the measured voltage and, in conjunction with the known cross-sectional area of the tube, the volume flow of the medium can also be determined.

For special applications involving monitoring of irregularities and leak locations, information relating to the pressure of the medium is desired as a supplement to the volume flow.

From EP0770855a1 a magnetically inductive flow meter is known which, in addition to measuring electrodes for determining the flow velocity, also has two pressure measuring transducers which are arranged along the surface element in the wall of the measuring tube.

US5670724 teaches a flow meter having a pair of measuring electrodes and a pressure measuring transducer arranged directly between the two measuring electrodes.

However, a disadvantage of these proposals is that an opening in the measuring tube has to be provided for mounting the pressure measuring transducer. However, each additional opening represents a potential leak location and should therefore be avoided as much as possible.

Disclosure of Invention

It is an object of the invention to provide a magnetic inductive flow meter with a pressure measuring transducer coupled with an electrode body.

The object of the invention is achieved by a magnetic induction flow meter as defined in claim 1.

The magnetic induction flow meter according to the invention for determining a flow velocity and/or a volume flow of a medium comprises: a measuring tube for conveying a medium; a magnetic field generating device; and at least one electrode assembly mounted in the measurement tube in the following manner: which forms an electrical contact with the medium, wherein the electrode assembly has an electrode body, wherein the electrode body is contact-pin-shaped and has a front end surface,

wherein the flow meter is characterized in that

A pressure measuring transducer is coupled to the electrode body, wherein the pressure measuring transducer is contactable with pressure acting on the front end surface.

Previously, in order to determine the pressure of the medium, a pressure measuring transducer had to be additionally introduced into the measuring tube. Usually, this requires additional openings in the measuring tube in addition to the openings required for the measuring electrodes. The solution of the invention does not require an additional opening in the measuring tube, since the pressure of the medium acting on the front end surface of the electrode body is directly sensed via a pressure measuring transducer coupled to the electrode body. In this case, it is particularly advantageous for the pressure measuring transducer to be in contact with the medium. However, there are also pressure measuring transducers which are only indirectly exposed to the medium and thus also only indirectly exposed to the pressure of the medium. This is the case, for example, when air is present between the pressure measuring transducer and the medium.

The electrode assembly is an electrode forming assembly having at least two parts, wherein at least a first part has this function and is realized to sense a measurement voltage in a flowing medium, and at least a second part has this function and is realized to measure a pressure in the medium. The electrode assembly may also comprise components having this function and adapted to determine other process parameters of the medium, such as for example temperature, viscosity and pH.

It is particularly advantageous if the first part comprises an electrode body. In this case, the electrode body is an electrode known from conventional magnetic induction flow meters. Such sensors are usually implemented in the form of a stylus and can therefore be mounted and fixed in the measuring tube in a simple manner. They have an electrode head with a front end surface, on which the pressure of the medium acts.

The second component is realized as a pressure measuring transducer. According to the invention, a pressure measuring transducer is coupled to the electrode body. This means that, on the one hand, the pressure measuring transducer is mechanically connected to the electrode body directly or indirectly via another component. On the other hand, this may mean that the pressure measuring transducer is in electrical contact with the electrode body. There is a coupling between the pressure measuring transducer and the electrode body, for example, when the two components are realized such that the pressure of the medium acting on the front face of the electrode head can load the pressure measuring transducer.

The pressure measuring transducer may be implemented in any manner. The pressure measuring transducer may be realized as, for example, a strain gauge, as a piezoresistive pressure sensor, as a piezoelectric pressure sensor, as a capacitive pressure sensor, as an inductive pressure sensor, as an optical pressure sensor, as a thermal pressure sensor or as a hall pressure sensor.

The electrode assembly assumes the function of a fill level monitoring electrode, a reference electrode and/or a measuring electrode.

In an additional embodiment, the pressure measuring transducer comprises a measuring membrane.

It is particularly advantageous if the pressure measuring transducer comprises a measuring membrane, since such a pressure measuring transducer can be produced in the desired range and the coupling between the pressure measuring transducer and the electrode body can be carried out without any additional adapter. In addition, the pressure measuring transducer with the measuring membrane covers the pressure range of interest for drinking water applications.

In additional embodiments, the electrode body includes a bore leading to the measurement tube.

In this case, the holes are intended to receive a medium and can be realized as blind holes or as channels. In the case of a blind hole, the pressure measuring transducer may be placed at the end of the hole or also on the inner surface of the hole. An electrode body having a passageway has an inlet end and an outlet end. In the case of a channel, the pressure sensor may be placed on the inner surface of the bore. However, especially in case the pressure measuring transducer has a measuring membrane, it is particularly advantageous when the pressure measuring transducer is mounted at the outlet end.

In an additional embodiment, the holes are channels and form an integrated pressure supply conduit for conveying the medium.

It is particularly advantageous if the channel is a pressure supply line, since then a plurality of additional embodiments with regard to the coupling of the pressure measuring transducer to the electrode body are possible. An advantageous embodiment comprises an adapter applied at the outlet end, via which an additional measuring transducer for recording process parameters is coupled with the electrode body.

The interior of the pores may have a coating which optimizes the movement of the medium into the pores and the wetting of the interior of the pores. The pressure supply conduit or orifice need not be self-draining, as it is well known that the pressure measuring transducer may also indirectly sense the pressure of the medium.

In additional embodiments, the electrode body ends are connected to the hollow body.

The hollow body is adapted to widen the pressure supply conduit so that a measuring membrane having a diameter larger than the diameter of the hole can be used. In this way, the area on which the pressure of the medium is exerted can be increased and the measurement accuracy of the pressure measurement is improved.

The hollow body can at the same time be realized as an adapter for other measuring transducers, wherein the measuring transducers comprise thermometers, pH sensors or sensors for determining viscosity, composition of the medium and/or other process parameters of the medium.

In an additional embodiment, the housing containing the pressure measuring transducer is connected to the hollow body by a material bond.

It is particularly advantageous if the housing is connected to the hollow body by material bonding, in particular via a screw connection, a soldered connection, a solder connection or an adhesive connection. In this way, an effective electrical connection can be implemented between the housing and the hollow body. Depending on the production method for the magnetic induction flow meter according to the invention, in order to obtain an effective seal, a form-locking connection is provided between the end region of the electrode body and the hollow body. This prevents the escape of the medium. Advantageously, the connection is implemented as a form-locking connection, since this ensures replaceability of the individual components. In this case, the form-locking connection comprises a sealing ring, and in particular a conical seal. The seal can also be electrically insulating, since the electrical connection to the electrode body can be effected via other contact locations, for example threads.

However, the connection between the end region of the electrode body and the hollow body can also be realized by material bonding. In this case, the connection is carried out after the electrode body has been introduced into the bore of the measuring tube and has been fixed to the measuring tube.

In additional embodiments, the electrical contact of the electrode body is implemented via the hollow body and/or the housing. This is advantageous because in this way additional wiring or additional contact devices to the electrode body can be omitted.

In an additional embodiment, the housing comprises at least one contact device via which the electrode assembly is in electrical contact with the measurement and/or evaluation unit.

Due to the contact arrangement in the housing of the pressure measuring transducer, a single plug-in connection is sufficient for tapping off the pressure signal and measuring the voltage.

In an additional embodiment, the magnetic field generating device comprises at least one coil and at least one coil core positioned inside the coil, wherein the coil core is realized as a hollow cylinder and the electrode assembly is positioned in the interior of the coil core.

Magnetic field generating devices are known which, in addition to a coil having an inner coil core, additionally comprise a field guide material in an outer region and at least one shielding element between the pole shoe and the field guide material and/or above the field guide material and the coil. The field guiding material and the shielding element achieve the object of reducing interference fields or stray fields. In contrast, the pole shoe is responsible for the coupling of the magnetic field into the medium. In this advantageous embodiment, the electrode assembly has the function of a fill level monitoring electrode and contains a magnetic field generating device. In this case, the measurement of the pressure can be carried out continuously or intermittently, for example when the magnetic field is switched off.

In an additional embodiment, the coil core has an interior, wherein an insulation is provided between the interior and the housing.

Since the electrical connection of the electrode body is effected via the housing of the pressure measuring transducer, an insulation between the electrode assembly and the coil core is necessary. The insulation may be realized as a coating or as a hollow cylindrical insulating sleeve.

In additional embodiments, the electrode body comprises an electrode head, wherein the electrode head has a contour.

In this case, the profile is realized to exhibit a slit shaped as a groove or a cross. However, it may have any other configuration, which results in a simplified mounting of the electrode body in the measuring tube. The profile is implemented in the following way: in the production of the magnetic induction flow meter of the invention, the technician can attach the electrode body to the profile in order then to push the insulating sleeve and fix the electrode body to the measuring tube with the nut in the next step.

In an additional embodiment, the electrode body comprises a level monitoring electrode and/or a reference electrode and/or a measuring electrode for sensing a measuring voltage in the medium.

In additional embodiments, the electrode body is implemented as a pin electrode, a tip electrode, or a mushroom electrode.

In an additional embodiment, the electrode body has a basic end shape, which is realized as a cone or a truncated cone,

wherein the hollow body has a seat for the electrode body, which is realized complementary to the basic end shape of the electrode body.

In this way, airtightness can be implemented between the electrode body and the hollow body without difficulty. Airtightness is particularly necessary when an air volume is provided between the pressure measuring transducer and the flowable medium.

Additionally, no lubricant is required, which is particularly advantageous for applications in the food and beverage industry.

Advantageously, the hollow body has an internally threaded seat for the electrode body, in order to thus carry out a releasable connection with the electrode body and its external thread provided in the end region of the electrode body.

In additional embodiments, the base end shape includes forming an angle φ together_EOf the surface element and the axis of the cone, wherein the angle phi_EBetween 5 ° and 25 °.

The region of the seat of the hollow body complementary to the end region of the electrode body comprises a surface element and a conical axis, wherein the conical axis and the surface element define an angle phi_H. The angle phi_HPreferably between 5 ° and 25 °. When the difference phi_E-φ_HBetween 0 ° and 4 °, a particularly stable connection can be implemented. This can be implemented, for example, by using different dimensional tolerances for the two angles in the production of the two components.

Finally, the partial conical formation of the complementary seats in the electrode body and the hollow body may provide a permanent force-transmitting connection between the two components.

Advantageously, the hollow body and the electrode body are formed from the same material. The electrode body and the hollow body can be brought into a cold-welded connection with one another with sufficient pressure.

The method for producing the magnetic induction flow meter according to the invention comprises the following method steps:

providing a measurement tube comprising a tube with a liner;

b forming an opening in the tube and liner;

c introducing the electrode body into the opening;

f, fixing the electrode main body through a nut;

g, connecting a shell containing the pressure measuring transducer with a hollow main body material with internal threads in a bonding mode;

h, screwing the hollow main body onto the threads of the electrode main body;

j surrounding the electrode assembly with an insulating part formed as a hollow cylinder and a coil core formed as a hollow cylinder;

k pushing the coil onto the coil core, the insulation and the electrode assembly;

l connects the electrode assembly with the measuring and/or evaluating unit via the contact device.

The method may further comprise the further method steps of:

d sealing the opening and/or fixing the electrode body by means of an insulating sleeve;

e fixing the electrode body to the contour;

i pushing a pole shoe with an opening; and

m pushes the magnetic field to guide the material.

However, the method is not limited to the performance of the individual method steps in the order set forth herein.

Drawings

The invention will now be explained in more detail on the basis of the drawings, in which the figures are shown as follows:

FIG. 1 is a schematic cross-sectional view of a tube of a prior art magnetic induction flow meter;

FIG. 2 is a schematic exploded view of an electrode assembly of the present invention;

FIG. 3 is a schematic view in longitudinal cross-section of a magnetic inductive flow meter of the present invention;

figure 4 is a longitudinal section and detail view of the hollow body of the present invention; and

figure 5 is a longitudinal cross-section and detail view of the electrode body of the present invention.

Detailed Description

Fig. 1 shows a known magnetic induction flow meter. The structure and the measuring principle of a magnetic-inductive flow meter are basically known. The conductive medium is conveyed through the measuring tube (1). The magnetic field generating device (7) is arranged such that its magnetic field lines extend perpendicular to a longitudinal direction defined by the measurement tube axis. Suitable as magnetic field generating means (7) are preferably saddle coils or pole shoes (26) with superposed coils (23) and coil cores (24). In the case of an applied magnetic field, a flow-dependent electrical potential distribution is generated in the measuring tube (1), which is sensed with two measuring electrodes (3, 4) mounted at the inner surface of the measuring tube (1). Typically, the electrodes (3, 4) are arranged diametrically opposite each other and form an electrode axis extending perpendicular to the magnetic field lines and the longitudinal axis of the tube. Based on the measured voltage and taking into account the magnetic flux density, the flow velocity and the cross-sectional area of the tube, the volumetric flow rate of the medium can be determined. In order to avoid short-circuiting of the measuring voltage on the measuring electrodes (3, 4) via the tube (8), the inner surface is lined with an insulating material, for example in the form of a plastic lining (2). The magnetic field generated by the magnetic field generating means, e.g. an electromagnet, is caused by a direct current of alternating polarity which is clocked by means of the operating unit. This ensures a stable zero point and makes the measurement insensitive to influences caused by inhomogeneities in the multiphase material, the medium or low conductivity. The measuring unit reads the voltage between the measuring electrodes (3, 4) and outputs the flow speed and/or the volume flow of the medium calculated by means of the evaluation unit. The conventional magnetic-inductive flow meter has two further electrodes (5, 6) as a supplement to the measuring electrodes (3, 4). On the one hand, a level-monitoring electrode (5) is used to detect partial filling of the measuring tube (1), which is optimally mounted at the highest point in the tube (8) and has only a minimum distance to the inner surface of the tube. This information is forwarded to the user and/or taken into account when determining the volume flow. In addition, a reference electrode (6), which is usually arranged diametrically opposite the fill level monitoring electrode (5), serves to ensure adequate grounding of the medium.

As shown in fig. 2, the pressure measuring transducer (12) is part of an electrode assembly (10), which additionally comprises at least one electrode body (11). In this case, the pressure measuring transducer (12) is located in a housing (16), which housing (16) is electrically conductive and thus provides an electrical contact between the electrode body (11) and a contact device (18) which is mounted at the end on the pressure measuring transducer (12). Thus, the entire electrode assembly (10) is in electrical contact with the medium. In a further development, the hollow body (14) forms a hollow space (19) between the pressure measuring transducer (12) and the electrode body (11), or the outlet of the bore (15) is realized as a pressure supply conduit. Thus, the pressure of the medium acting on the front end surface of the electrode body (11) is guided to the measurement membrane (13) via the pressure supply conduit, where the pressure is detected (13). In addition, the housing (16) is connected to the hollow body (14) by material bonding. The electrode body (11) comprises an electrode head (17), wherein the electrode head (17) has a contour. The contact device (18) serves to tap off the pressure of the medium converted into an electrical or digital signal for the measuring and/or evaluating unit (9). In this case, the contact device (18) comprises at least one pin which is in electrical contact with the housing (16) and thus with the electrode body (11). The hollow body (14) is implemented in the following way: on the one hand, it forms a hollow space (12) between the measuring membrane (13) and the electrode body (11), and on the other hand seals the electrode body (11) such that the medium flowing through the pressure supply line cannot escape via the contact region. The electrode body (11) comprises an external thread for fixing the electrode body (11) to the measuring tube (1) and is connected to a hollow body (14) having an internal thread.

The magnetic induction flow meter shown in fig. 3 comprises an electrode assembly (10) comprising a contact-pin-shaped electrode body (11) with an electrode head (17) having a contour (20), an insulating sleeve (21), a nut (22), a hollow body (14) and a pressure measuring transducer (12). The electrode body (11) comprises a thread for fixing the electrode body (11) to the measuring tube (1) with a nut (22) on the one hand and for connecting to the hollow body (14) and/or the pressure measuring transducer (12) on the other hand. In order to mount the electrode assembly (10) to the measuring tube (1), the electrode body (11) is guided through openings provided in the tube (8) and the lining (2) and is fixed with an insulating sleeve (21) and a nut (22) on the outside of the tube. The hollow body (14) has an internal thread, so that the hollow body (14) with the form-locking pressure measuring transducer (12) can be screwed onto the thread of the electrode body (11). The hollow body (14) is realized to produce a sealing contact to the electrode body (11) such that the medium flowing through the hole cannot escape at the contact location between the two components. The seal is preferably realized as a conical seal. The electrode assembly (10) shown in fig. 3 is realized as a fill level monitoring electrode (5) and is arranged in the interior of the coil (23), in particular in the interior of the coil core (24). For this further development, it is necessary to provide the coil core (24) as a hollow cylinder and to electrically insulate the electrode assembly (10) from the magnetic field generating device (7), in particular from the coil (23) and the coil core (24). The insulation (25) may be implemented by coating the inside of the coil core (24) with an electrically insulating material or by introducing an electrically insulating hollow cylinder between the coil core (24) and the electrode assembly (10).

The hollow body (14) shown in fig. 4 has a first end and a second end. Arranged on the first end is an opening which, together with the housing of the pressure measuring transducer, forms a hollow space (19). The second end comprises a seat (29) for the electrode body. The seat (29) comprises an internal thread (32) for releasably connecting the hollow body (14) with the electrode body. The seat (29) is at least partially cylindrically embodied and comprises the following regions: which narrows conically in the direction of the hollow space (19) and is formed complementary to the end region of the electrode body. In the narrowing region of the seat (29), the seat (29) adopts a frustoconical shape. The seat (29) may have an additional area on its inlet end, which is conically realized, in order to facilitate the introduction of the electrode body. The hollow space (19) and the seat (29) are connected together via a channel (33). The channel (33) and the seat (29) have a common axis of symmetry (34).

The detailed view shows a portion of a longitudinal cross-section of the hollow body (14). The seat (29) has an inner diameter which continuously decreases in the direction of the hollow space (19). In this way, the seat (29) adopts, at least partially, a frustoconical shape in this region. The seat (29) comprises a stop surface (35) for the electrode body. The conical narrowing comprises a surface element (30) intersecting the stop surface (35). Forming an angle phi from the vertical or cone axis (31) of the stop surface (35) and the surfacing element (30)_HPreferably, the angle is between 5 ° and 25 °. In the case of the illustrated embodiment, phi_H10 °, with a dimensional tolerance of-1 °.

Fig. 5 shows an electrode body (11) of the invention with a bore (15), which is realized as a pressure supply conduit. The electrode body (11) is at least partially realized as a hollow cylinder. In the region, the electrode body (11) has an external thread (36) for releasably connecting the electrode body (11) to the hollow body (14). In a tip region of the electrode body (11) entering a seat of the hollow body (14), an outer diameter of the electrode body (11) becomes smaller in a direction of the hollow body (14). The end region is conically shaped and takes the basic end shape of a truncated cone with the hole (15), wherein the hole (15) and the truncated cone have a common axis of symmetry (34). In the assembled state, a side surface (37) of the end region is in contact with the hollow body. The side surface (37) is in contact with an inner side surface (38) of the hollow body (14) when the electrode body (11) and the hollow body are screwed together. If a further force is exerted on the electrode body (11), the end region of the electrode body (11) is deformed in the direction of the axis of symmetry (34). The electrode body (11) does not have to contact the stop surface (35). A gap may be left between the stop surface of the hollow body and the electrode body (11).

The detailed view shows the end region of the electrode body (11). The outer diameter of the electrode body (11) decreases in the direction of the tip end while the diameter of the bore (15) remains constant. The result is a reduction in the wall thickness in the end region. The transition from the distal end surface of the electrode body (11) to the side surface (37) is rounded. The surface element (30) forms an angle phi with the conical axis (31) of the basic end shape_EPreferably, the angle is between 5 ° and 25 °. Angle phi_HAnd phi_EAre adapted to each other such that the difference phi_E-φ_HBetween 0 ° and 4 °. In the described embodiment, the angle phi_E10 °, with a dimensional tolerance of +1 °.

List of reference numerals

1 measuring tube

2 lining

3 first measuring electrode

4 second measuring electrode

5 material level monitoring electrode

6 reference electrode

7 magnetic field generating device

8 tube

9 measuring, operating and/or evaluating unit

10 electrode assembly

11 electrode body

12 pressure measuring transducer

13 measuring film

14 hollow body

15 holes

16 casing

17 electrode head

18 contact device

19 hollow space

20 profile

21 insulating sleeve

22 nut

23 coil

24 coil core

25 insulating part

26 pole shoe

27 field guiding material

28 basic end shape

29 seat part

30 surface element

31 axis of taper

32 internal screw thread

33 path

34 axis of symmetry

35 stop surface

36 external screw thread

37 side surface

38 inner side surface