阅读说明：本技术 测量传感器的振荡传感器的线圈设备、测量设备的测量传感器和测量设备 (Coil arrangement of an oscillation sensor of a measuring sensor, measuring sensor of a measuring device and measuring device ) 是由 泽韦林·拉姆塞耶 本杰明·施文特 马克·维尔纳 克劳德·霍林格 马丁·斯图基 于 2019-07-30 设计创作，主要内容包括：本发明涉及用于测量流过测量变换器或测量设备的至少一个测量管的介质的密度或质量流量的测量变换器(100)或测量设备(200)的振荡传感器(10)或振荡激励器(11)的线圈装置(1),包括：具有至少一个电路板层(3)的电路板(2),适于记录或产生时变磁场的至少一个线圈(4),其中,至少一个线圈在每种情况下具有绕组区域(WB)和没有绕组匝数的中心区域(Z),其中,线圈的中心区域为矩形,其具有相对的第一边(S1)并具有相对的第二边(S2),其中,第一边具有第一边长度,并且其中,第二边在每种情况下具有第二边长度,其中,导电迹线的迹线宽度(LB)至少为30微米,其特征在于第一边长度与第二边长度之比大于3.25,特别是大于3.5,优选大于3.75。(The invention relates to a coil arrangement (1) of an oscillation transducer (10) or oscillation exciter (11) of a measuring transducer (100) or measuring device (200) for measuring the density or mass flow of a medium flowing through at least one measuring tube of the measuring transducer or measuring device, comprising: a circuit board (2) having at least one circuit board layer (3), at least one coil (4) adapted to record or generate a time-varying magnetic field, wherein the at least one coil has in each case a winding region (WB) and a central region (Z) with no winding turns, wherein the central region of the coil is rectangular with opposing first sides (S1) and with opposing second sides (S2), wherein the first sides have a first side length, and wherein the second sides have a second side length in each case, wherein the trace width (LB) of the conductive tracks is at least 30 micrometer, characterized in that the ratio of the first side length to the second side length is larger than 3.25, in particular larger than 3.5, preferably larger than 3.75.)

1. A coil arrangement (1) of an oscillation transducer (10) or an oscillation exciter (11) of a measuring transducer (100) or a measuring device (200) for measuring the density or mass flow of a medium flowing through at least one measuring tube of the measuring transducer or the measuring device comprises

A circuit board (2) having at least one circuit board layer (3), wherein each circuit board layer has a first face (3.1) and a second face (3.2) parallel to the first face,

at least one coil (4) adapted for recording or generating a time-varying magnetic field, wherein the coil is at least partly constituted by an electrically conductive track (4.3), wherein the coil is arranged on a first and/or a second side of a circuit-board layer,

wherein the at least one coil has in each case a first coil end (4.1) and in each case a second coil end (4.2), wherein the at least one first coil end and the at least one second coil end are in each case connected with their contacts (5),

wherein the at least one coil has in each case a winding region (WB) and a central region (Z) with no number of winding turns, wherein the central region of the coil is rectangular with opposing first sides (S1) and with opposing second sides (S2), wherein the first sides have a first side length, and wherein the second sides have in each case a second side length, wherein the rectangular shape of the central region has a first side bisector (SH1) belonging to the first sides and a second side bisector (SH2) belonging to the second sides

Wherein the conductive traces have a trace width (LB) of at least 30 microns,

it is characterized in that

The ratio of the length of the first side to the length of the second side is greater than 3.25, in particular greater than 3.5, preferably greater than 3.75.

2. The coil device as set forth in claim 1,

wherein the conductive trace has a trace centerline (4.4),

wherein adjacent coil turns have a turn pitch (WA) from the trace centerline

Wherein the turn pitch is F times smaller than twice the trace width,

wherein F is at least 1, in particular at least 1.2, preferably at least 1.4.

3. The coil device according to claim 1 or 2,

wherein an outer contour of the winding area has a rectangular shape.

4. Coil device according to one of the preceding claims,

wherein the at least one coil has in each case at least 4 turns, in particular at least 5 turns, preferably at least 6 turns,

and/or wherein the total number of turns of said at least one coil is at least 65, in particular at least 70, preferably at least 72.

5. Coil device according to one of the preceding claims,

wherein the plurality of circuit board layers (3) have in each case a coil having in each case a first coil end and in each case a second coil end,

wherein the coils are interconnected in series and/or in parallel with each other,

wherein the coils of different circuit board layers produce constructively interfering magnetic fields when a direct current voltage is applied.

6. The coil device as set forth in claim 5,

wherein the first coil ends are connected by a first via (7.1) and wherein the second coil ends are connected by a second via (7.2), or

Wherein adjacent coils are connected in each case by a through-hole, in each case by one coil end thereof, wherein in each case one end of an external coil is connected (5) with a contact element.

7. Coil device according to one of the preceding claims,

wherein the first side length is at least 3 mm, in particular at least 4 mm, preferably at least 5 mm, and/or the first side length is at most 20 mm, in particular at most 15 mm, and preferably at most 12 mm, and/or

Wherein the second side has a length of at least 0.3 mm, in particular at least 0.5 mm, preferably at least 1 mm, and/or at most 5 mm, in particular at most 4 mm, preferably at most 3 mm.

8. A measuring transducer (100) of a measuring device (200) for recording a mass flow or a density of a medium flowing through at least one measuring tube of the measuring transducer, comprising:

the at least one measurement tube (110) having an inlet (111) and an outlet (112) and being adapted to convey the medium between the inlet and the outlet;

at least one exciter (11) adapted to excite the at least one measuring tube to perform oscillations; and the number of the first and second groups,

at least two sensors (10) adapted to register the oscillatory deflection of at least one measuring tube,

wherein the exciter and the sensor each have a coil arrangement (1) and each have a magnet arrangement (9), wherein the magnet arrangement is movable relative to its coil arrangement, and wherein the magnet arrangement and the coil arrangement of the exciter or the sensor, as the case may be, interact by means of a magnetic field,

wherein the measurement transducer has a support body (120) adapted to hold the at least one measurement tube,

it is characterized in that

The sensor having in each case a coil arrangement according to one of claims 1 to 7,

wherein the measuring tube oscillatory deflection has an oscillation direction parallel to the second side of the rectangle of the central region.

9. The measurement transducer according to claim 8,

wherein the magnet arrangement of the sensor or exciter on at least one measuring tube has at least one magnet (9.1) with at least one magnet end face facing the coil arrangement, wherein the magnet end face is delimited by two first magnet edges arranged opposite one another and two second magnet edges arranged opposite one another,

wherein, with the measuring tube in a rest position and taking into account the projection of the magnet end faces onto the first face of the circuit board layer, the second magnet edge extends parallel to the second edge into the central region in the oscillation direction of the measuring tube, wherein the first magnet edge facing the second edge bisector is spaced apart from the second edge bisector by a distance, wherein the measuring tube is adapted to oscillate with an oscillation amplitude, wherein the distance is greater than half the oscillation amplitude,

wherein the first magnet edge facing the second side bisector extends in particular parallel to the second side bisector.

10. The measurement transducer according to claim 9,

wherein the magnet end face is rectangular.

11. Measurement transducer according to claim 9 or 10,

wherein the second magnet edge completely overlaps the winding region in the direction of the second magnet edge with the measuring tube in the rest position.

12. Measurement transducer according to one of the claims 9 to 11,

wherein the length of the first magnet edge is at least 5%, in particular at least 10%, preferably at least 20%, or less than the first edge length

Wherein the length of the first magnet edge is at least 50 micrometers, in particular at least 75 micrometers, and preferably at least 100 micrometers, smaller than the first edge length, and

wherein the first magnet edge facing the second side bisector in the projection is spaced apart from the winding region in a direction parallel to the second side bisector.

13. Measurement transducer according to one of the claims 9 to 12,

wherein the magnet end faces are perpendicular to the coil axis and have a spacing from the circuit board of at least 20 micrometers, in particular at least 40 micrometers, preferably at least 50 micrometers, and/or

The distance between the magnet end face and the circuit board is 200 micrometers at most, particularly 150 micrometers at most, and preferably 120 micrometers at most.

14. Measurement transducer according to one of the claims 9 to 13,

wherein the at least one magnet arranged on the measuring tube has an annular shape with a closed end (9.5) and an open end (9.6), wherein the open end is adapted to surround the associated coil arrangement and to provide the coil arrangement with a magnetic field extending parallel to the coil axis.

15. Measurement transducer according to one of the claims 9 to 14,

wherein the measurement transducer comprises at least one pair of measurement tubes, wherein the measurement tubes of the pair are adapted to oscillate opposite to each other,

wherein the at least one sensor and/or the at least one actuator each have a coil arrangement with a coil and a magnet arrangement with at least two magnets,

wherein at least one magnet is fastened to each of the measuring tube pairs.

16. A measurement device, comprising:

the measurement transducer (100) of any one of claims 8 to 15;

an electronic measuring/operating circuit (210), wherein the electronic measuring/operating circuit is adapted to operate the sensor (10) and the actuator (11) and is connected thereto by an electrical connection (220),

wherein the electronic measurement/operation circuit is further adapted to determine a flow measurement value and/or a density measurement value, an

Wherein the measuring device has in particular an electronics housing (230) for accommodating the electronic measuring/operating circuit.

Technical Field

In the case of a measuring device, by means of which the density and/or mass flow of the medium passing through at least one measuring tube of the measuring device is to be determined, oscillations imposed on the measuring tube can be taken into account for measuring the density and/or mass flow.

For measuring the oscillations, sensors are generally used which have a coil arrangement and a magnet arrangement, wherein the measuring tube oscillations cause a relative movement between the coil arrangement and the magnet arrangement, so that a voltage is induced in the coil of the coil arrangement.

Background

Such a measuring device is disclosed, for example, in DE102015120087a1, in which the coil arrangement comprises a planar coil which is at least partially helical. In one variant, the planar coil has a rectangular shape with three-quarters of windings to which the helically formed portion in the central region is attached. In order to induce a voltage in the helical portion, the magnetic field passing through the central region must satisfy the resonance condition of the helical portion. Thus, the oscillations of the measuring tube can be recorded in a narrow oscillation frequency range. In a further variant, the planar coil is constructed in multiple layers and circularly. It has been found that circular coils are simpler to manufacture, but suffer from the low sensitivity of the sensors used to measure tube oscillations.

Disclosure of Invention

It is therefore an object of the present invention to provide a sensor, a measuring transducer and a coil arrangement of a measuring device, by means of which a better sensitivity to measuring tube oscillations is achieved.

This object is achieved by a coil arrangement as defined in independent claim 1, a measuring transducer as defined in independent claim 8 and a measuring device as defined in independent claim 16.

The coil arrangement of the invention for an oscillation sensor or exciter of a measuring transducer or measuring device for measuring the density or mass flow of a medium flowing through at least one measuring tube of the measuring transducer or measuring device comprises:

a circuit board having at least one circuit board layer, wherein each circuit board layer has a first face and a second face parallel to the first face,

at least one coil adapted for recording or generating a time-varying magnetic field, wherein the coil is at least partly constituted by an electrically conductive track, wherein the coil is arranged on a first and/or a second side of a circuit-board layer,

wherein the at least one coil has in each case a first coil end and in each case a second coil end,

wherein the at least one coil has in each case a winding area and a central area without winding turns, wherein the central area of the coil is rectangular, which rectangle has opposite first sides and has second sides, wherein the first sides have a first side length and wherein the second sides have a second side length, wherein the rectangular shape of the central area has a first side bisector belonging to the first sides and a second side bisector belonging to the second sides,

wherein the conductive traces have a trace width of at least 30 microns,

it is characterized in that

The ratio of the length of the first side to the length of the second side is greater than 2, in particular greater than 3, preferably greater than 3.75.

By providing a rectangular shape with long and short sides, the movement of the magnet in the direction of the short sides can be recorded and measured very accurately, in particular when the magnet has a certain degree of movement in the direction of the first side in the area of the length of the first side.

Thus, even a small movement of the magnet is sufficient to provide a significant change in the magnetic flux through the coil, and thus, a voltage is induced in the coil, as compared to conventional coil arrangements.

In one embodiment, the conductive traces have trace centerlines,

wherein adjacent coil turns have a turn pitch from the trace centerline,

wherein the turn pitch is F times smaller than twice the trace width,

wherein F is at least 1, in particular at least 1.2, preferably at least 1.4.

In this way, the planar coil can be packed particularly tightly and the sensitivity to changes in the magnetic field passing through the coil is increased.

In one embodiment, the outer contour of the winding area has a rectangular shape.

In one embodiment, at least one coil has in each case at least 4 turns, in particular at least 5 turns, preferably at least 6 turns,

and/or wherein the total number of turns of at least one coil is at least 65, in particular at least 70, preferably at least 72.

By superimposing multiple planar coils on different layers, the sensitivity to changes in the magnetic field passing through the coils can be increased.

In one embodiment, the plurality of circuit board layers have in each case a coil, which has in each case a first coil end and in each case a second coil end,

wherein the coils are interconnected in series and/or in parallel with each other,

wherein the coils of different circuit board layers generate constructive interference magnetic fields when a direct current voltage is applied.

By superimposing multiple planar coils on different layers, the sensitivity to changes in the magnetic field passing through the coils can be increased.

In one embodiment, the first coil end is connected by a first via and the second coil end is connected by a second via, or

Wherein adjacent coils are connected in each case by a through-hole, in each case by one coil end thereof, wherein in each case the ends of the outer coils are connected with the contact elements in each case.

In an embodiment, the first side length is at least 3 mm, in particular at least 4 mm, and preferably at least 5 mm, and/or the first side length is at most 20 mm, in particular at most 15 mm, and preferably at most 12 mm, and/or

Wherein the second side has a length of at least 0.3 mm, in particular at least 0.5 mm, and preferably at least 1 mm, and/or at most 5 mm, in particular at most 4 mm, and preferably at most 3 mm.

A larger geometric coil size improves the signal-to-noise ratio when the magnets applied to induce the electric field in the coil are of similar size with respect to the first side. However, the magnets must not be too heavy, otherwise the measuring tube is influenced to an undesirable extent by oscillations. A person skilled in the art, having experience in constructing a measuring transducer or measuring device of the type used in the present invention, can estimate the maximum geometric dimensions of such a magnet and derive therefrom the upper limits of the first and second sides of the coil.

The measuring transducer of the invention for a measuring device for recording the mass flow or density of a medium flowing through at least one measuring tube of the measuring transducer comprises:

at least one measuring tube having an inlet and an outlet and adapted to convey a medium between the inlet and the outlet;

at least one exciter adapted to excite the at least one measuring tube to perform oscillations; and

at least two sensors adapted to register the oscillatory deflection of at least one measuring tube;

wherein the exciter and the sensor have in each case a coil arrangement and in each case a magnet arrangement, wherein the magnet arrangement is movable relative to its coil arrangement, and wherein the magnet arrangement and the coil arrangement of the exciter or the sensor, as the case may be, interact by means of a magnetic field,

wherein the measurement transducer has a support body adapted to hold at least one measurement tube,

wherein the sensor has in each case a coil arrangement according to the invention,

wherein the measuring tube oscillatory deflection has an oscillation direction parallel to the second side of the rectangle of the central region.

By orienting the coil arrangement such that the oscillation direction of at least one associated measuring tube runs parallel to the short second side of the rectangle of the central region, the coil arrangement has a higher sensitivity to relative movements of the magnet arrangement.

In this case, the measurement of the medium flow through the measuring tube can be carried out by the coriolis measurement principle.

In one embodiment, the magnet arrangement of the sensor or exciter on the at least one measuring tube has at least one magnet with at least one magnet end face facing the coil arrangement, wherein the magnet end face is delimited by two first magnet edges arranged opposite one another and two second magnet edges arranged opposite one another,

wherein, with the measuring tube in the rest position and taking into account the projection of the magnet end faces on the first face of the circuit-board layer, the second magnet edge extends parallel to the second edge into the central region in the oscillation direction of the measuring tube, wherein the first magnet edge facing the second edge bisector is at a distance from the second edge bisector, wherein the measuring tube is adapted to oscillate with an oscillation amplitude, wherein the distance is greater than half the oscillation amplitude,

wherein the first magnet edge facing the second side bisector extends in particular parallel to the second side bisector.

In one embodiment, the magnet end faces are rectangular.

In one embodiment, the second magnet edge completely overlaps the winding region in the direction of the second magnet edge with the measuring tube in the rest position.

In this way, the interaction between the magnet and the coil arrangement is improved.

In one embodiment, the length of the first magnet edge is at least 5%, in particular at least 10%, preferably at least 20%, or less than the length of the first edge

Wherein the length of the first magnet edge is at least 50 micrometers, in particular at least 75 micrometers, and preferably at least 100 micrometers, smaller than the first edge length, and

wherein a first magnet edge facing the second side bisector in projection is spaced apart from the winding area in a direction parallel to the second side bisector.

It is advantageous to locate the magnet well approximately centered with respect to the first side bisector.

In one embodiment, the magnet end faces are perpendicular to the coil axis and are spaced from the circuit board by at least 20 microns, in particular at least 40 microns, preferably at least 50 microns, and/or

The distance between the magnet end face and the circuit board is 200 micrometers at most, particularly 150 micrometers at most, and preferably 120 micrometers at most.

The small spacing of the magnet end faces from the coil arrangement increases the sensitivity of the coil arrangement to magnet movement. The minimum spacing from the coil arrangement reduces the chance of damage to the coil arrangement when assembling the measuring transducer.

In one embodiment, the at least one magnet arranged on the measuring tube has an annular shape with a closed end and an open end, wherein the open end is adapted to surround the associated coil arrangement and to provide the coil arrangement with a magnetic field extending parallel to the coil axis.

In this way, the magnetic field lines of the magnet can be embodied spatially uniformly and concentrated in a good approximation on the central region and the winding region, and the sensitivity of the coil arrangement to relative movements of the magnet is therefore increased.

In one embodiment, the measurement transducer comprises at least one pair of measurement tubes, wherein the pair of measurement tubes are adapted to oscillate opposite to each other,

wherein the at least one sensor and/or the at least one actuator each have a coil arrangement with a coil and a magnet arrangement with at least two magnets,

wherein at least one magnet is fastened to each of the measuring tube pairs.

The extension of the two magnets from the relatively oscillating measuring tube to the central region of the coil results in a doubling of the magnetic flux variation flowing through the coil arrangement and, consequently, in a higher sensitivity of the coil to magnetic field variations caused by the oscillations of the measuring tube.

The measuring apparatus of the present invention includes:

a measurement transducer;

an electronic measuring/operating circuit, wherein the electronic measuring/operating circuit is adapted to operate the sensor and the actuator and is connected thereto by an electrical connection,

wherein at least one electrical connection is led to the electronic measuring/operating circuit through the cable guide,

wherein the electronic measuring/operating circuit is further adapted to determine a flow measurement value and/or a density measurement value, an

The measuring device has, inter alia, an electronics housing for accommodating electronic measuring/operating circuits.

Drawings

The invention will now be described on the basis of examples of embodiments shown in the drawings, which are as follows:

fig. 1 shows a measuring device according to the invention with a measuring transducer according to the invention.

Fig. 2a) to c) schematically show a coil arrangement according to the invention.

Fig. 3a) and b) schematically show a comparison of the coil arrangement of the invention and a prior art coil arrangement.

Fig. 4 and 5 schematically show an embodiment of the sensor of the invention by way of example.

Fig. 6 shows, as an example, the arrangement of the coil arrangement and the magnet arrangement for two measuring tubes.

Detailed Description

Fig. 1 shows a measuring device 200 with a measuring transducer 100, wherein the measuring transducer has two measuring tubes 110, which are held by a support body 120 of the measuring transducer. The measuring tube communicates on the inlet side with a first manifold 131 and on the outlet side with a second manifold 132, wherein the first manifold 131 of the manifold 130 is adapted to receive the medium flowing from the pipe (not shown) into the measuring transducer and distribute it evenly to the measuring tube. Accordingly, the second manifold 132 is adapted to receive the medium discharged from the measurement tube and convey the medium back into the pipe. In this case, the measuring transducer is inserted into the pipe via a process connection 140, in particular a flange 141. The measuring transducer comprises an oscillation exciter 11, which oscillation exciter 11 is adapted to excite the measuring tube into oscillation. The measuring transducer additionally comprises two oscillation sensors 10 which are adapted to register the oscillations of the measuring tube. The person skilled in the art is not limited to the number of measuring tubes, oscillation exciters and oscillation sensors shown here. Thus, the embodiments shown herein are exemplary.

The measuring device comprises an electronic measurement/arithmetic circuit 210 which is adapted to operate the oscillation exciter and the oscillation sensor and to calculate and output a mass flow and/or density measurement of the medium. In this case, the electronic measuring/operating circuit is connected to the oscillation sensor and to the oscillation exciter by means of electrical connections 220. The measuring device comprises an electronics housing 230 in which electronic measuring/operating circuitry is arranged. In order to determine the mass flow, the measuring device uses the coriolis effect of the medium flowing through the measuring tube, in which case the flow influences the oscillation of the measuring tube in a characteristic manner.

Fig. 2a) shows a plan view of an advantageous coil arrangement 1 according to the invention with a circuit board 2 having a plurality of circuit board layers 3, the plurality of circuit board layers 3 having in each case a first side 3.1 and a second side 3.2. The coil 4 with the first coil end 4.1 and the second coil end 4.2 is applied in the form of a conductive track 4.3, such as the conductive track 4.3 shown here on the first face 3.1. The other circuit board layers may have other coils which are connected together, for example by vias 7, wherein, for example, the first vias 7.1 connect the first coil ends and wherein the second vias 7.2 connect the second coil ends together, which would correspond to connecting the coils in parallel. Alternatively, instead of an electrically parallel connection of the coils, an electrically series connection can also occur, in which the coil ends of adjacent coils are connected, for example, by way of a through-hole, and in which the electrically conductive tracks of adjacent coils are moved in opposite directions in rotation in each case. It is important that when a dc voltage is applied between the through holes, the coils of the different circuit board layers generate constructive interference magnetic fields. Alternatively, instead of the electrically parallel connection of the coils described here, an electrically series connection can also be used, in which the coil ends of adjacent coils are connected, for example, by way of a through-hole, and in which the electrically conductive tracks of adjacent coils in each case move in opposition and rotate. The coil arrangement can be designed by the person skilled in the art according to the specific requirements of the coil arrangement. The coil arrangement comprises contact elements 5, by means of which the coil arrangement can be connected to an electronic measuring/operating circuit 210 (see fig. 1) of the measuring device by means of electrical connection lines 220 (see fig. 1 and 6).

The coil 4 comprises a winding region WB and a central region Z of turns W without winding, wherein the central region has a rectangular shape with two opposite first sides S1 and two opposite second sides S2. The first side S1 has a first side length and the second side has a second side length, wherein the ratio of the first side length to the second side length is greater than 2, in particular greater than 3, and preferably greater than 3.5. Side of the coil end

The first side length is for example at least 3 mm, in particular at least 4 mm, and preferably at least 5 mm, and/or at most 20 mm, in particular at most 15 mm, and preferably at most 12 mm, while the second side length is for example at least 0.3 mm, in particular at least 0.5 mm, and preferably at least 1 mm, and/or at most 5 mm, in particular at most 4 mm, preferably at most 3 mm. A larger geometric coil size may improve the signal/noise ratio when the magnets applied to induce the electric field in the coil are of similar size relative to the first side. However, the magnet must not be too heavy, since otherwise it would influence the oscillation of the measuring tube to an undesirable extent. A person skilled in the art, having experience in constructing a measuring transducer or measuring device of the type used in the present invention, can estimate the maximum geometric dimensions of such a magnet and derive therefrom the upper limits of the first and second sides of the coil.

In this case, the coil of the invention has at least 4 turns, and preferably, at least as shown here, 6 turns W.

Fig. 2b) shows an enlarged detail of the winding region WB with two portions of adjacent turns W. Centered on the track centre line 4.4, the turns have a turn pitch WA which is F times smaller than twice the track width, wherein F is at least 1, in particular at least 1.2, preferably at least 1.4. In this case, the track width LB is less than 500. mu.m, preferably less than 400. mu.m, in particular less than 300. mu.m.

As shown in fig. 2c), the circuit board 3 may have a plurality of circuit board layers, wherein the plurality of circuit board layers has a coil in each case. In this case, the coils of the plurality of circuit board layers are connected by the through-holes 7.1, 7.2, so that the coils of different circuit board layers generate constructively interfering magnetic fields when a voltage is applied across the through-holes. For example, as shown here, the first through hole 7.1 may connect the first coil ends 4.1 of different coils together while the second through hole 7.2 may connect the second coil ends 4.2 of different coils together. This corresponds to a parallel circuit of different coils. Alternatively, adjacent coils may be connected together by adjacent coil ends, wherein a first coil end of an outer coil is connected with a contact element 5, and wherein a second coil end of a further outer coil is connected with another contact element, and wherein adjacent coil ends are connected by a through hole. This would correspond to a series connection of different coils.

Preferably, the coil arrangement has at least 6, and preferably at least 8, in particular at least 10 coils, which are stacked by circuit board layers. In this case, the circuit board layer forming the substrate is preferably thinner than 200 microns, and preferably thinner than 150 microns. In this case, the substrate comprises, for example, dupont 951 material. In this case, the conductive traces applied on the substrate comprise, for example, dupont 614SR material.

In this case, the ohmic resistance of the different coils is less than 50 ohms, in particular less than 40 ohms, preferably less than 30 ohms, wherein the difference between the ohmic resistance of the different coils is less than 10 ohms, in particular less than 5 ohms, and preferably less than 2 ohms.

Fig. 3a) and b) show by way of example a comparison between the inventive coil arrangement 1 (see fig. 3a) and a conventional coil arrangement 1 (see fig. 3 b). In both cases, a magnet arrangement 9 with two magnets 9.1 is shown by way of example, wherein each magnet 9.1 is fastened to a different one of the two measuring tubes (not shown) in order to follow the movement of the opposite movements of the measuring tubes. The rectangular central area Z of the coil arrangement of the invention has a first side S1, the side length of which first side S1 is equal to the diameter of the circular central area Z of a conventional coil arrangement. In this case, the area of the rectangular central region is smaller than the area of the circular central region. In the case of a rectangular central region, the oscillation of the measuring tube at a given amplitude in the case of magnets of the same size results in a relatively large variation of the magnetic field through the coil arrangement, compared to the specific area of the central region. Thus, the density of the medium flowing through the measuring tube or the mass flow of the medium can be determined more accurately.

Fig. 4 schematically shows a plan view of a sensor with a coil arrangement and a magnet 9.1 of a magnet arrangement 9 matched to the coil arrangement. Each magnet is fastened to the other of the two measuring tubes (not shown) and the measuring tubes oscillate relative to each other.

The magnets have in each case a magnet end face 9.2 facing the coil arrangement and bounded by a first magnet edge 9.11 and a second magnet edge 9.12. In the case of a measuring tube in the rest position, the distance of the first magnet edge to the second edge bisector SH2 of the second edge of the central region is preferably at least 30 micrometers, in particular at least 60 micrometers. In this case, the first magnet edge facing the second side bisector is preferably parallel to the second side bisector. In this case, however, the magnet end faces advantageously do not have to be rectangular. In this case, the magnet 9.1 preferably completely overlaps the winding region WB in the direction of its second magnet edge 9.12. In this case, the length of the first magnet edge 9.11 is smaller than the length of the first side S1 of the central region, wherein the magnets are preferably arranged substantially symmetrically with respect to the first side bisector SH 1.

Instead of two measuring tubes, each having at least one magnet associated with a sensor, the measuring transducer may also have only one measuring tube with at least one magnet, by means of which a voltage can be induced in the coil arrangement.

Fig. 5 shows, by way of example, a side view of a further coil arrangement, wherein the side view can be obtained by rotating the embodiment shown in fig. 4 by 90 degrees about the first side bisector. Instead of a magnet with a magnetic end face facing the coil arrangement, the magnet has an annular shape such that two mutually facing sides 9.2 facing the inserted coil arrangement provide the coil arrangement with an approximately spatially uniform magnetic field in a limited area, wherein the magnet surrounds the coil arrangement.

Fig. 6 shows a side view of two measuring tubes 110 (one tube hidden behind the other) of a measuring device with two oscillation sensors 10, seen from a side view SA2, the oscillation sensors 10 in each case comprising a coil arrangement 1 according to the invention, see fig. 2, wherein the oscillation sensor components are in each case connected to a different one of the measuring tubes 110 by a support H and are adapted to follow their oscillating movement, as shown for example by the inlet-side section EA, or the coil arrangement is in each case mechanically connected to a support 120 by a support H, as shown for example by the outlet-side section AA. The cross section QE thus divides the at least one measuring tube into an inlet-side portion EA and an outlet-side portion AA. In the case of a coil arrangement arranged on the measuring tube, the arrangement of the contact elements according to the invention can be used to connect the electrical connection lines 220 to the side of the coil arrangement facing the measuring tube. In the prior art, the connection of the electrical lines to the side of the coil arrangement facing away from the measuring tube, see dashed lines, can therefore be dispensed with if necessary. For example, by preventing oscillatable bending of the electrical connection, the risk of breaking the contact between the electrical connection and the contact element is prevented. The magnet arrangement 9, which is, for example, as shown here, mounted on a second measuring tube hidden by the illustrated measuring tube and adapted to follow its oscillating movement, interacts with the associated coil arrangement by means of an electromagnetic field during the measuring operation. In the presence of opposite measuring tube oscillations, the oscillations can therefore be registered by the voltages induced in the coils.

In the case of fastening the coil arrangement on the support body, the electrical connection can be guided along the support body. In this case, the arrangement of the invention enables an electrical connection of equal length, measured from the contact element, and an equal guidance of the electrical connection.

Alternatively, the measuring transducer may, for example, have only one measuring tube, wherein the magnet arrangement of the sensor is, for example, fastened to the measuring tube and the associated coil arrangement is fastened to the support body, or vice versa. The measuring transducer may also have more than two measuring tubes. The coil arrangement can be adjusted as desired by the person skilled in the art.

The at least one measuring tube may, for example, have at least one bend as shown here or may also extend in a straight line. The suitability of the coil arrangement is independent of the geometry of the measuring tube.

List of reference characters

1 coil device

2 Circuit Board

3 Circuit board layer

3.1 first side

3.2 second side

4 coil

4.1 first coil end

4.2 second coil end

4.3 conductive traces

4.4 Trace centerlines

5 contact

7 through hole

9 magnet device

9.1 magnet

9.11 first magnet edge

9.12 second magnet edge

9.2 magnet end faces

9.5 closed end

9.6 open end

9.7 projection

10 oscillation sensor

11 oscillatory actuator

100 measuring transducer

110 measuring tube

111 inlet

112 outlet

120 support

130 manifold

131 first manifold

132 second manifold

140 process connection

141 flange

200 measuring device

210 electronic measurement/operation circuit

220 electric connecting wire

230 electronic casing

LB trace Width

WB winding region

H support

WA turn pitch

Z center region

S1 first side

S2 second side

First bisector of SH1

Second side bisector of SH2