Connection system, in particular plug connection system, for inductive contactless transmission of data supply signals and / or energy supply signals, and combination

Abstract

A connection system (1), in particular a plug connection system, for inductive contactless transmission of data supply signals and / or energy supply signals between a sensor device and a base unit in a measurement and transmission system, comprises a sensor-side connection element (2) having a first coil winding (5), a base-side connection element (6) having a second coil winding (10) and being able to be brought into engagement with the sensor-side connection element (2) for magnetic coupling for the purpose of data and / or energy transmission, and a short-circuit turn element made of an electrically conductive material that runs around the engagement zone (E) between the sensor-side connection element (2) and the base-side connection element (2). A combination (17) comprises the connection system (1) and a support unit (18), in particular an immersion instrument, that can be brought into engagement with the connection system (1). A measurement combination comprises the connection system (1) or the combination (17) and the sensor device.

Description

[0001] Connection system, in particular plug-in connection system, for inductive contactless transmission of data and / or power supply signals and combination

[0002] This patent application claims priority from German patent application DE 10 2023 202 368.7, the contents of which are incorporated herein by reference.

[0003] The invention relates to a connection system, in particular a plug-in connection system, for the inductive, contactless transmission of data and / or power supply signals, having the features specified in the preamble of claim 1. Furthermore, the invention relates to a combination with such a connection system.

[0004] The closest prior art is represented by DE 197 19 730 CI, which deals with a plug-in connection system for the contactless transmission of data and power supply signals between a sensor device and a base unit in a measurement and transmission system. A sensor device, for example, for a temperature sensor, is coupled to a sensor-side plug-in connection element. The sensor device possesses a certain degree of "intelligence" because it has an AD converter for the measurement signal of the thermocouple representing the measurement sensor and a microprocessor-based control and storage unit connected downstream of this.The sensor-side connector element, which is coupled to the sensor device, contains a data modulator-demodulator unit combined with a power receiver. This unit is connected to a first coupling partner element of an inductive coupling for the contactless transmission of data and power supply signals. The second coupling partner element of the inductive coupling path is located in the base-side connector element, which is connected to the corresponding lines of a bus system for data and power supply purposes. This base-side connector element, in turn, contains a combined data modulator-demodulator unit with a power transmitter, which supplies the sensor system with power via the primary power supply from the bus system.

[0005] Well-known systems of this type available on the market include the Memosens ( ) system (Endress and Hauser) and the Inducon(ß) system (Knick). Such a plug-in system usually consists of two modules - a so-called sensor module as the sensor-side connecting element and a so-called cable module as the base-side connecting element. The variables measured in the sensor module (e.g. pH value) are transferred inductively to the plugged-in cable module and then digitally transmitted, for example via an RS485 interface, to a so-called transmitter. The transmitter, in turn, can visualize and store this data and transmit it via another interface to a higher-level plant control system or remote control station. The inductive system of the above-mentioned systems is designed so that both auxiliary power and data (usually using semi-duplex technology) are transmitted via the same magnetic components.Typically, the inductive component on the cable assembly side consists of a thin ferrite rod with an associated coil winding. The inductive component on the cable assembly side usually consists of a coil with a larger diameter without ferrite / magnetic material. These assemblies and inductive components are typically encased and potted. The housing is designed to create a lockable mechanical plug-in connection. A relevant portion of the cable assembly coil slides into the sensor coil, forming a corresponding engagement zone through this engagement. This results in a magnetic coupling that enables the previously described functionality. The housing components and potting materials are generally electrically non-conductive and magnetically ineffective.

[0006] The connection systems discussed above are used in almost all applications in the chemical industry, research, etc. Two extreme cases can be identified. On the one hand, the connection system can be operated in an environment in which there are no electrically conductive materials or materials that could influence the magnetic circuit in the immediate vicinity of the inductive system. This operating case arises, for example, when the system is held manually in a medium.

[0007] Alternatively, the sensor can be operated in a so-called fitting (possibly a submersible fitting) which is designed in such a way that the connection system, and thus also the inductive system contained therein, is completely surrounded by an electrically conductive material (e.g. often a stainless steel tube). This complete enclosure represents, among other things, a short-circuit winding for the inductive system and has a significant effect on the electrical properties of the inductive system in the plug-in arrangement. This changes, among other things, the coupling factor and the loss factor of the inductive system. While it is generally possible to adjust and optimize the overall system to the new properties of the inductive system resulting from this short-circuit winding, considerable reductions in operating performance must be expected without such an influence. Optimization in this sense therefore always represents a compromise between these two conditions.In practice, the manufacturer of such a system must invest considerable development and testing effort to ensure the operational reliability of such a sensor system under all operating and installation conditions.

[0008] The technological background is DE 10 2013 111 405 A1, which discloses a magnetic shield for inductive connectors in the form of a sleeve arranged around the inductive connector. To achieve optimized magnetic shielding, the sleeve material is ferromagnetic with a permeability of > 1. Furthermore, the sleeve is interrupted by a longitudinal slot along its circumference to prevent short-circuiting.

[0009] Based on the above-described problems of the prior art, the invention is based on the object of improving such a connection system in such a way that the inductive signal transmission between the sensor-side and base-side connection element operates unaffected by induction-relevant environmental factors.

[0010] According to the germinal drawing part of claim 1, this object is achieved in that a short-circuit winding element made of an electrically conductive material runs around the engagement zone between the sensor-side and base-side connecting element.

[0011] With regard to the problem described above, this short-circuit winding element has the effect that the effect of another (external) short-circuit swindling or short-circuit-like winding (e.g. in the form of a fitting surrounding the connection system) on the inductive system of the sensor arrangement now leads to no or no relevant further detuning of the system. The system is now permanently in a single state influenced by the short-circuit winding element according to the invention and can thus be permanently optimized for this single operating case. Reduced susceptibility to influence by neighboring sensors - e.g. sensors in a bundle - can also be achieved. This simplifies the development process and, above all, the test procedures intended to ensure reliable operation of the connection system in all operating and installation situations.

[0012] Preferably, the connection system is designed for inductive contactless transmission of at least data signals, in particular digital and / or analog data signals, more preferably also power supply signals, between the sensor device and the base unit.

[0013] The short-circuit winding element is understood to be an electrical conductor having at least one electrically short-circuited turn. In other words, the short-circuit winding element has a conductor that forms a closed circuit. The first and second coil windings preferably have a coil axis. The electrical conductor, in particular the circuit, preferably encircles the engagement zone and / or the sensor-side connecting element and / or the base-side connecting element, in particular their respective coil axis. An aspect ratio of the cross section of the electrical conductor is preferably in the range from 1 to 1000, in particular from 2 to 200, in particular from 3 to 100, in particular from 5 to 80, in particular from 10 to 60, in particular from 15 to 40, in particular from 20 to 30.

[0014] The engagement zone is preferably understood to be the area in which the first and second coil windings are arranged when the sensor-side and base-side connecting elements are engaged with each other. The engagement zone extends, in particular, within a smallest convex envelope surrounding the first and second coil windings in this arrangement. Preferably, in the engagement arrangement, the first or second coil winding encircles the other coil winding.

[0015] According to one aspect of the invention, the sensor-side and base-side connecting elements can be brought into plug-in engagement with one another. The plug-in engagement can comprise means for forming a force-locking and / or positive-locking connection, in particular a snap-in connection and / or a bayonet connection.

[0016] The short-circuit winding element can be designed as a short-circuit winding body, in particular integral with or separately from a housing of the sensor-side or base-side connecting element. Alternatively, the short-circuit winding element can be designed as a coating, in particular of a housing of the sensor-side or base-side connecting element.

[0017] Preferred developments of the connection system are specified in the dependent claims. The design of the short-circuit winding element as a short-circuit sleeve is advantageously simple. The short-circuit sleeve preferably surrounds the engagement zone such that it overlaps the engagement zone at least partially, in particular completely, in an orthogonal projection onto a plane oriented parallel to the coil axis. The short-circuit sleeve is preferably designed to be electrically conductive all the way around, in particular the engagement zone and / or the coil axis are designed to be electrically conductive all the way around.

[0018] The electrical resistance, in particular the ohmic resistance, of the circuit formed by the short-circuit winding element is preferably a maximum of 1 kΩ, in particular a maximum of 1 Q, in particular a maximum of 1 mΩ, in particular a maximum of 100 pΩ, in particular a maximum of 1 pΩ, and / or at least 1 nΩ. The electrical resistance and / or a specific resistance and / or a line cross-section of the short-circuit winding element can be constant or variable over the line length of the short-circuit winding element, in particular with a difference between a maximum value and a minimum value of at least 25% of the maximum value. The specific resistance of the material of the short-circuit winding element is preferably a maximum of 1 kΩmm. 2 / m, in particular a maximum of 10 mm² 2 / m, in particular a maximum of 1 mm² 2 / m, in particular a maximum of 0.1 mm² 2 / m, and / or at least 0.01 mm² 2 / m, in particular at least 0.1 mm² 2 / m.

[0019] The axial length of the short-circuit sleeve preferably overlaps the engagement zone at least partially, in particular over at least 10%, in particular over at least 20%, in particular over at least 50%, in particular over at least 75%, in particular over at least 100%, of the length of the engagement zone, in particular along the coil axis. The axial length refers to the length along the coil axis. This represents a mechanically simple, yet robust design of the short-circuit winding element, while also providing a good neutralization effect with respect to the effect of external circumferential short-circuit elements.

[0020] According to one aspect, the short-circuit winding element, in particular the short-circuit sleeve, is not electrically contacted. This means that the short-circuit winding element has no electrically conductive connection to another object. The short-circuit winding element can be arranged electrically insulated from the sensor-side and / or the base-side connecting element. It is particularly advantageous if the short-circuit winding element is electrically insulated from a shield and / or from a data and / or power supply signal connection, in particular from any electrical line, of the sensor-side and / or the base-side connecting element. This can prevent electrically transmitted interference from acting on the short-circuit winding element and thus on the sensitive coupling area at the engagement zone.

[0021] According to a further aspect, the short-circuit winding element, in particular the short-circuit sleeve, extends over a length in a range from 10% to 1,000%, in particular from 50% to 500%, in particular from 100% to 250%, of the entire length of the engagement zone and / or in a range from 0.1 mm to 100 mm, in particular from 0.5 mm to 75 mm, in particular from 1 mm to 50 mm, in particular from 2 mm to 40 mm, in particular from 5 mm to 20 mm, in particular axially to the short-circuit sleeve and / or along the signal line and / or along the coil axis. According to a further aspect, the short-circuit winding element can be made of a material with an electrical conductivity of at least 3xl0 7 S / m, especially at least 4xl0 7 S / m, especially at least 5xl0 7S / m, in particular consisting of them. This achieves the desired effect particularly reliably, namely that the effect of an additional, external short-circuit winding on the connection system leads to no or no relevant detuning of the inductive coupling path.

[0022] The connection system is preferably designed to transmit data signals between the sensor-side and the base-side connecting elements. For this purpose, the signal transmitted between the connecting elements can be modulated. In particular, a modulator unit, in particular a modulator-demodulator unit, can be connected to the first and / or second coil winding, in particular to each of them. A correspondingly modulated signal is susceptible to external influences. The short-circuit winding element reduces the susceptibility to interference and ensures reliable transmission of the modulated signal, in particular the modulated data signal.

[0023] According to a further aspect, there is no electrically conductive connection, in particular no galvanic connection, between the sensor-side connecting element and the base-side connecting element. This makes the connection system suitable for use in potentially explosive environments. Furthermore, disruptive influences on the inductive coupling path and / or disruptive influences on the connected sensor device and / or base unit due to the conductive connection across the connection system can be avoided. Non-magnetic materials are understood to be non-ferromagnetic materials, preferably diamagnetic and / or paramagnetic materials. The preferred non-magnetic metals are in particular aluminum, copper or stainless steel or corresponding non-magnetic metal alloys. These ensure good protection without causing an undesirable magnetic shielding effect.The short-circuit winding element preferably has a magnetic permeability in a range of maximum IxlO. 3 , especially maximum IxlO 2 , especially maximum IxlO 1 , in particular a maximum of 1, in particular a maximum of IxlO' 1 , especially maximum IxlO' 3 , especially maximum IxlO' 5 This ensures that the technical effect emanating from the short-circuit winding element is reliably achieved, namely to achieve a magnetic reaction on the first and / or second coil winding, in particular due to a short-circuit current induced in the short-circuit winding element by the current-carrying first and / or second coil winding.

[0024] The advantageous design of a short-circuit sleeve as a continuously circumferential, uninterrupted, particularly with regard to electrical conductivity, ring, in particular a sleeve body, serves the same purpose.

[0025] Further preferred embodiments of the invention relate to the mechanical fixation of the short-circuit sleeve on the housing of the sensor-side or base-side connecting element, for example, via a positive engagement of the short-circuit winding element, in particular the short-circuit sleeve, with the housing. The positive engagement formed between the short-circuit winding element, in particular the short-circuit sleeve, and the housing preferably effects a positive connection in the direction of the coil axis and / or in the circumferential direction around the coil axis and / or radially to the coil axis.

[0026] The positive engagement can be formed by an external groove in the housing of the connecting element and a locking projection engaging therein on the inside of the short-circuit sleeve. The locking projection, in turn, can be produced using simple production techniques by means of an externally embossed recess in the short-circuit sleeve.

[0027] The short-circuit winding element can also be made of an electrically conductive or electrically conductive coated plastic material, so injection molding processes are available for its production. The short-circuit winding element can also be manufactured using a deep-drawing process, injection molding, sintering, or 3D printing.

[0028] A short-circuit winding element designed as a separate component can be avoided with the effect of a corresponding production-technical rationalization if the housing material of the sensor-side or base-side connecting element itself is made of an electrically conductive or electrically conductive coated plastic material.

[0029] A connection system with a circumferential short-circuit winding element can be implemented not only in newly designed connection systems but also retrofitted to existing systems. For this purpose, the short-circuit winding element can be connected, for example, force-fitting and / or material-fitting, particularly by means of adhesive bonding, to the housing of the sensor-side or base-side connection element.

[0030] Preferably, the short-circuit winding element is permanently connected, in particular not non-destructively detachable, to the sensor-side and / or base-side connecting element. The connection can be designed as a material-to-material connection, in particular as an adhesive connection, and / or as a positive-locking connection, in particular as a snap-in connection.

[0031] An axial extension of the short-circuit winding element, in particular of the short-circuit sleeve, along the coil axis is preferably a maximum of ten times, in particular a maximum of four times, in particular a maximum of three times, in particular a maximum of twice, in particular a maximum of 1.5 times, in particular a maximum of once, in particular a maximum of 0.7 times, in particular a maximum of 0.5 times, and / or at least 0.1 times, in particular at least 0.5 times, in particular at least once, as large as the axial extension of the engagement zone and / or of the first and / or second coil winding along the coil axis. This advantageously ensures that the connection system can be dimensioned particularly compactly and the magnetic coupling is reliable in operation.

[0032] The invention is further based on the object of providing an improved combination which in particular ensures the inductive signal transmission between the sensor-side and base-side connecting elements unaffected by induction-relevant environmental factors.

[0033] This object is achieved by a combination with the features of claim 15. The advantages of the combination correspond to the advantages of the connection system described above. The combination is preferably further developed with at least one of the features described above in connection with the connection system.

[0034] The support unit is designed to support the connection system, in particular as a fitting, in particular as a submersible fitting, and / or as a measuring lance. The support unit is preferably tubular, particularly in the region of the engagement section. The connection system can be reversibly arranged in an interior of the at least partially tubular support unit. The connection system can preferably be fastened to the support unit, in particular reversibly locked thereto.

[0035] The support unit can, in particular in the engagement section, comprise, in particular consist of, an electrically conductive material, in particular an iron-based alloy, in particular stainless steel.

[0036] According to a further aspect, the engagement zone surrounds an electrically conductive part of the support unit. A smallest convex envelope of an electrically conductive part of the support unit preferably completely encompasses the engagement zone, in particular the first and / or second coil winding, especially when the sensor-side and base-side connecting elements are engaged with each other.

[0037] The invention is further based on the object of providing an improved measuring combination, which in particular ensures the inductive data and / or power supply signal transmission between the sensor-side and base-side connecting elements unaffected by induction-relevant environmental factors. This object is achieved by a measuring combination with the features of claim 18. The advantages of the measuring combination correspond to the advantages of the connection system and the combination described above. The measuring combination is preferably further developed with at least one of the features described above in connection with the connection system and / or the combination.

[0038] The sensor device preferably has at least one measuring sensor. The measuring sensor can, for example, be a pH measuring sensor.

[0039] Preferably, the sensor device, in particular the at least one measuring sensor, is designed to provide digital and / or analog data signals. Corresponding data signals can preferably be transmitted via the connection system. Additionally, the connection system can be designed to transmit energy signals, in particular to supply the sensor device, in particular the at least one measuring sensor, with the electrical power required for its operation.

[0040] Further features, details, and advantages of the invention will become apparent from the following description of an embodiment with reference to the accompanying drawings. They show:

[0041] Fig. 1 is a perspective, partially broken-away view of a connection system with separate connecting elements, Fig. 2 is a schematic side view of a base-side connecting element with short-circuit sleeve in an intermediate manufacturing step,

[0042] Fig. 3 shows a cross-section of the short-circuit sleeve along the section line III-III in Fig. 2, or

[0043] Fig. 4 is a schematic side view of a combination with the connection system in Fig. 1 and a support unit for supporting the connection system.

[0044] The plug-in connection system 1 shown in Fig. 1 is used for the inductive, contactless transmission of data and power supply signals between a base unit and a sensor device, such as a pH measuring sensor. The sensor device has a measuring head, in particular a measuring electrode 19. The measuring head is rigidly connected, in particular not non-destructively detachable, to the sensor-side connecting element 2.

[0045] The plug-in connection system 1, in particular the sensor-side connecting element 2, has a connecting means, in particular for establishing a screw connection, for connecting the plug-in connection system 1 to a wall of a measuring chamber, in particular in a media-tight manner. The plug-in connection system 1 is intended to be arranged outside the measuring chamber, and the sensor head is arranged inside the measuring chamber.

[0046] According to an alternative embodiment (not shown), the sensor head can be connected to the sensor-side connecting element 2 via a cable connection. The latter has a conventional housing 3 in which a conventional measurement signal conditioning circuit 4 with a microprocessor-supported control and storage unit and a data modulator-demodulator unit in combination with a power receiver is housed and connected to a first coupling partner element of an inductive coupling for the contactless transmission of data and power supply signals. This first coupling partner element is a sensor-side coil winding 5, which cooperates with the second coupling partner element of the inductive coupling path in the base-side plug-in connection element 6. This, in turn, is housed in a housing 8 and connected to the corresponding lines of a bus system via a cable 7 for data and power supply purposes.Typically, the base-side inductive component consists of a thin ferrite rod 9 with an associated coil winding 10. This base-side plug-in connection element 6 contains a processing circuit 4a combined with a data modulator-demodulator unit and energy transmitter, which supplies voltage to the sensor system via the primary power supply from the bus system. In the mated position of the connecting elements 2, 6 (not shown in the figures), the coil winding 5 and the ferrite rod 9 with coil winding 10 engage with each other, thus marking engagement zone E (see Fig. 2). The congruent housings 3, 8 of the connecting elements 2, 6 lock via a positive connection 12, thus establishing a mechanically secure connection between the sensor-side and base-side plug-in connection elements 2, 6.The positive connection 12 comprises a sensor-side engagement part 12a and a base-side base part 12b. The sensor-side engagement part 12a is designed as a plug. The base-side engagement part 12b is designed as a socket. In particular, the base-side engagement part 12b is rotatably mounted relative to the housing 8, in particular about a central longitudinal axis of the base-side connecting element 6. The positive connection 12 is designed as a bayonet connection.

[0047] Preferably, the sensor-side housing 3 and / or the base-side housing 8 comprise, and are made of, an electrically non-conductive material, in particular a plastic material, preferably manufactured using a plastic injection molding process. The same preferably applies to the base-side engagement part 12b. The housings 3, 8 and the base-side engagement part 12b are preferably made of a non-ferromagnetic material, in particular a paramagnetic or diamagnetic material.

[0048] 1 and 2, a short-circuit sleeve 11 is seated on the housing 8 of the base-side plug-in connection element 6 as a short-circuit winding element, which is arranged around the engagement zone E and surrounds the housing 8 of the base-side connection element 6 without interruption. This short-circuit sleeve 11 is made, for example, of copper, a metal with good electrical conductivity but is non-magnetic. An axial extension L of the short-circuit sleeve 11 along a coil axis A is, for example, twice as large as an axial extension 1 of the engagement zone E along the coil axis A. Its wall thickness d is, for example, 0.5 mm, its outer diameter D is, for example, 19 mm, and its length L along the coil axis A is, for example, 16 mm. The axial extension 1 of the engagement zone E along the coil axis A is, for example, 8 mm.According to an advantageous alternative, the short-circuit sleeve 11 can be formed by the base-side engagement part 12b. For this purpose, the base-side engagement part 12b could comprise an electrically conductive material, in particular a metallic material, and in particular, it could consist thereof.

[0049] As can be seen from Figs. 2 and 3, a positive engagement is provided for fixing the short-circuit sleeve 11 to the base-side connecting element 6, in particular to the base-side engagement part 12b. This positive engagement is formed by at least one, preferably at least two, in particular at least three, in particular exactly four, locking recesses 13 arranged on the outside of the housing 8, in particular arranged at regular angular intervals from one another over the circumference of the housing 8, in particular each in the form of a dome-like depression and / or a cavity and / or a groove, in particular a circumferential one, on the one hand, and by at least one complementarily designed locking projection 14 on the inside of the short-circuit sleeve 11, on the other hand. The number and / or arrangement of the at least one locking projection 14 preferably correspond to that of the at least one locking recess 13.The positive engagement preferably forms an axially fixed and / or rotationally fixed, in particular a completely fixed, connection between the housing 8 and the short-circuit sleeve 11. The locking projections 14 are preferably formed by embossed recesses 15 introduced from the outside using conventional embossing dies. The embossing can take place before or after the short-circuit sleeve 11 is pushed (arrow 16) onto the housing 8. The short-circuit sleeve 11 can be connected to the housing 8 in a detachable manner, in particular in a non-destructive manner. Preferably, the short-circuit sleeve 11 is connected to the housing 8 in a non-detachable manner, in particular in a non-destructive manner. Fig. 4 shows a combination 17 comprising the connection system 1 and a support unit 18 designed to support the connection system 1. The support unit 18 is designed as a so-called measuring lance or fitting, in particular as an immersion fitting. The connection system 1 can be engaged with the support unit 18.In particular, the connection system 1 can be reversibly arranged, in particular fastened, in an interior of the tubular support unit 18.

[0050] The support unit 18 is made of an electrically conductive material, in particular an iron-based alloy, in particular stainless steel. In an engagement section F, the support unit 18 overlaps the engagement zone E, in particular in an orthogonal projection onto a plane oriented parallel to the coil axis A. In the engagement section F, the electrically conductive support unit 18 completely surrounds the engagement zone E, in particular in the form of a closed circuit surrounding the coil axis A, in particular in the form of a short-circuit winding. Due to the arrangement of the short-circuit sleeve 11 in the engagement zone E, the inductive transmission behavior between the sensor-side and the base-side connecting elements 2, 6 is largely independent of the presence of the support unit 18 or other objects that affect the inductive transmission behavior, in particular in the vicinity of the connection system 1.This advantageously ensures that the connection system 1 can be operated equally reliably with the support unit 18, i.e. in the combination 17, or without the support unit 18.

Claims

Patent claims 1. Connection system (1), in particular a plug-in connection system, for the inductive contactless transmission of data and / or power supply signals between a sensor device and a base unit in a measuring and transmission system, comprising - a sensor-side connecting element (2) with a first coil winding (5), and - a base-side connecting element (6) with a second coil winding (10) which can be brought into engagement with the sensor-side connecting element (2) for a magnetic coupling for data and / or energy transmission, characterized by - a short-circuit winding element made of an electrically conductive material, which runs around the engagement zone (E) between the sensor-side connecting element (2) and the base-side connecting element (6).

2. Connection system (1) according to claim 1, characterized in that the short-circuit winding element is designed as a short-circuit sleeve (11).

3. Connection system (1) according to claim 2, characterized in that an axial length (L) of the short-circuit sleeve (11) overlaps the entire length of the engagement zone (E).

4. Connection system (1) according to one of the preceding claims, characterized in that the short-circuit winding element is not electrically contacted.

5. Connection system (1) according to one of the preceding claims, characterized in that the short-circuit winding element comprises a material with an electrical conductivity of at least 3xl0 7 S / m.

6. Connection system (1) according to one of the preceding claims, characterized in that the short-circuit winding element consists of a non-magnetic metal, in particular aluminum, copper or stainless steel, or of a non-magnetic metal alloy.

7. Connection system (1) according to one of the preceding claims, characterized in that the short-circuit winding element is designed as a continuously circumferential, uninterrupted ring.

8. Connection system (1) according to one of the preceding claims, characterized in that the short-circuit winding element is mechanically firmly connected to the housing (3, 8) of the sensor-side connection element (2) or the base-side connection element (6) via a positive engagement.

9. Connection system (1) according to claim 8, characterized in that the positive engagement is formed by at least one external locking recess (13) in a housing (3, 8) of the sensor-side connecting element (2) or base-side connecting element (6) and at least one locking projection (14) engaging therein on the inside of the short-circuit winding element.

10. Connection system (1) according to claim 9, characterized in that the locking projection (14) is formed by an embossed recess (15) introduced from the outside in the short-circuit sleeve (11).

11. Connection system (1) according to one of the preceding claims, characterized in that the short-circuit winding element is formed from an electrically conductive or electrically conductive coated plastic material.

12. Connection system (1) according to one of the preceding claims, characterized in that the short-circuit winding element is formed from an electrically conductive or electrically conductive coated housing material of the sensor-side connection element (2) or the base-side connection element (2).

13. Connection system (1) according to one of the preceding claims, characterized in that the short-circuit winding element is non-detachably connected to the sensor-side connection element (2) and / or the base-side connection element (6).

14. Connection system (1) according to one of the preceding claims, characterized in that an axial extension (L) of the short-circuit winding element along the coil axis (A) is at most four times as large as the axial extension (L) of the engagement zone (E) along the coil axis (A).

15. Combination (17), comprising 15.1 a connection system (1) according to one of claims 1 to 14, and 15.2 a support unit (18) engageable with the connection system (1), in particular a submersible fitting.

16. Combination (17) according to claim 15, characterized in that the support unit (18) has an engagement section (F) made of an electrically conductive material surrounding the engagement zone (E).

17. Combination (17) according to claim 16, characterized in that the engagement portion (F) comprises an iron-based alloy.

18. Measuring combination, comprising 18.1 a connection system (1) according to one of claims 1 to 14 or a combination (17) according to one of claims 15 to 17 and 18.2 the sensor device which is in data signal transmitting connection with the sensor-side connection element (2).

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