Electric connector and a magnetically inductive flow meter

Abstract

The invention relates to an electric connector for connecting a transducer (MU) to a measuring sensor (MA) of a magnetically inductive flow meter, wherein the measuring sensor (MA) comprises a magnetic-field-generating device, a first measuring electrode (1030) and a second measuring electrode (1031), wherein the transducer (MU) comprises measuring and / or operating electronics (MBE) with a screen driver, wherein the electric connector comprises: - a connector protective jacket; - an outer screen (2) which extends at least in some portions within the connector protective jacket, wherein the outer screen (2) is configured to be connected to an electric reference potential; - a first coaxial cable (KK1) which extends at least in some portions within the outer screen (2), wherein the first coaxial cable (KK1) comprises a coaxial-cable inner conductor and a coaxial-cable outer conductor, wherein the coaxial-cable inner conductor of the first coaxial cable (KK1) is configured to connect the first measuring electrode (1030) to the measuring and / or operating electronics (MBE), wherein the coaxial-cable outer conductor of the first coaxial cable (KK1) is configured to be connected to the screen driver; - a second coaxial cable (KK2) which extends at least in some portions within the outer screen (2), wherein the second coaxial cable (KK2) comprises a coaxial-cable inner conductor and a coaxial-cable outer conductor, wherein the coaxial-cable inner conductor of the second coaxial cable (KK2) is configured to connect the second measuring electrode (1031) to the measuring and / or operating electronics (MBE), wherein the coaxial-cable outer conductor with the second coaxial cable (KK2) is configured to be connected to the screen driver; and - a signal cable which extends at least in some portions within the outer screen (2), wherein the signal cable (SK) comprises two insulated signal-cable inner conductors (SI1, SI2) which are twisted together, wherein the signal-cable inner conductors (SI1, SI2) are configured to connect the magnet-field-generating device to the measuring and / or operating electronics (MBE).

Description

[0001] Electrical connector and a magnetic-inductive flowmeter

[0002] The invention relates to an electrical connector for connecting a measuring transducer to a measuring sensor of a magnetic-inductive flowmeter and magnetic-inductive flowmeter.

[0003] Magnetic-inductive flowmeters are used to determine the flow velocity and / or volume flow of a medium in a measuring tube. A magnetic-inductive flowmeter comprises a magnetic field-generating device that generates a magnetic field perpendicular to the transverse axis of the measuring tube. Single or multiple coils are typically used for this purpose. To create a predominantly homogeneous magnetic field, additional pole pieces are shaped and mounted so that the magnetic field lines run essentially perpendicular to the transverse axis across the entire measuring tube cross-section. A pair of electrodes attached to the outer surface of the measuring tube taps an inductively generated electrical measuring voltage, which arises when a conductive medium flows in the direction of the longitudinal axis when a magnetic field is applied.Since the measured voltage depends on the velocity of the flowing medium according to Faraday's law of induction, the flow velocity and, with the addition of a known measuring tube cross-section, the volume flow of the medium can be determined from the measured voltage.

[0004] Depending on the application, it may be advantageous to position the transmitter of the magnetic-inductive flowmeter separately from the sensor. This means that the transmitter is neither directly nor indirectly connected to the sensor. This requires an electrical connector that transmits the operating signal from the transmitter to the sensor and the measurement signal from the sensor to the transmitter. Conventional electrical connectors cause a zero-point error. The invention is based on the object of remedying this problem.

[0005] The object is achieved by the electrical connector according to claim 1 and the magnetic inductive flow meter according to claim 7.

[0006] The electrical connector according to the invention for connecting a measuring transducer to a measuring sensor of a magnetic-inductive flowmeter, wherein the measuring sensor comprises a magnetic field generating device, a first measuring electrode and a second measuring electrode, wherein the measuring transducer has a measuring and / or operating electronics with at least one shield driver, comprises:

[0007] - a connector protective sheath;

[0008] - an outer shield which extends at least partially within the connector protective sheath, wherein the outer shield is adapted to be connected to an electrical reference potential,

[0009] - a first coaxial cable which extends at least partially within the outer shield, wherein the first coaxial cable comprises a coaxial cable inner conductor and a coaxial cable outer conductor, wherein the coaxial cable inner conductor of the first coaxial cable is configured to connect the first measuring electrode to the measuring and / or operating electronics, wherein the coaxial cable outer conductor of the first coaxial cable is configured to be connected to the shield driver;

[0010] - a second coaxial cable which extends at least partially within the outer shield, wherein the second coaxial cable comprises a coaxial cable inner conductor and a coaxial cable outer conductor, wherein the coaxial cable inner conductor of the second coaxial cable is configured to connect the second measuring electrode to the measuring and / or operating electronics, wherein the coaxial cable outer conductor of the second coaxial cable is configured to be connected to the shield driver;

[0011] - a signal cable which extends at least partially within the outer shield, wherein the signal cable comprises two insulated signal cable inner conductors which are twisted together, wherein the signal cable inner conductors are designed to connect the magnetic field generating device to the measuring and / or operating electronics.

[0012] Advantageous embodiments of the invention are the subject of the subclaims.

[0013] One embodiment provides that the signal cable comprises a signal cable outer conductor, wherein the signal cable inner conductors extend at least partially within the signal cable outer conductor, wherein the signal cable outer conductor is in electrical contact with the outer shield. One embodiment provides that the measuring sensor comprises a reference electrode, wherein the electrical connector further comprises:

[0014] - a third coaxial cable which extends at least partially within the outer shield, wherein the third coaxial cable comprises a coaxial cable inner conductor and a coaxial cable outer conductor, wherein the coaxial cable inner conductor of the third coaxial cable is configured to connect the reference electrode to the measuring and / or operating electronics, wherein the coaxial cable outer conductor of the third coaxial cable is configured to be connected to the shield driver.

[0015] One embodiment provides that the measuring sensor comprises a level monitoring electrode, wherein the electrical connector further comprises:

[0016] - a fourth coaxial cable which extends at least partially within the outer shield, wherein the fourth coaxial cable comprises a coaxial cable inner conductor and a coaxial cable outer conductor, wherein the coaxial cable inner conductor of the fourth coaxial cable is configured to connect the level monitoring electrode to the measuring and / or operating electronics, wherein the coaxial cable outer conductor of the third coaxial cable is configured to be connected to the shield driver.

[0017] One embodiment provides that the measuring sensor comprises a temperature sensor, wherein the electrical connector further comprises:

[0018] - a fourth coaxial cable which extends at least partially within the outer shielding, wherein the fourth coaxial cable comprises a coaxial cable inner conductor and a coaxial cable outer conductor, wherein the coaxial cable inner conductor of the fourth coaxial cable is configured to connect a first temperature sensor measuring output of the temperature sensor to a first temperature sensor measuring input of the measuring and / or operating electronics, wherein the coaxial cable outer conductor of the fourth coaxial cable is configured to connect a second temperature sensor measuring output of the temperature sensor to a second temperature sensor measuring input of the measuring and / or operating electronics.

[0019] One embodiment provides that the connector protective sheath, the coaxial cable and the signal cable are dimensioned so that the electrical connector can be passed through a PG cable gland.

[0020] The flowmeter according to the invention, in particular the magnetic-inductive flowmeter, comprises:

[0021] - measuring sensor, wherein the measuring sensor comprises a magnetic field generating device, a first measuring electrode and a second measuring electrode,

[0022] - Measuring transducer, wherein the measuring transducer is offset from the measuring sensor, wherein the measuring transducer comprises measuring and / or operating electronics with at least one shield driver, wherein the measuring sensor and the measuring transducer are connected, in particular exclusively, via exactly one electrical connector according to one of the preceding claims.

[0023] The invention is explained in more detail with reference to the following figures. They show:

[0024] Fig. 1 : a cross section through a first embodiment of the electrical connector;

[0025] Fig. 2 : a cross section through a second embodiment of the electrical connector;

[0026] Fig. 3 : a sensor connected to a remote transmitter via an electrical connector according to the invention; and

[0027] Fig. 4 : a cross-section through a magnetic-inductive flowmeter.

[0028] Some embodiments of the present disclosure are described in more detail below with reference to the accompanying figures. The figures illustrate some, but not all, embodiments of the disclosure. Indeed, these disclosures may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Different embodiments, each illustrating individual details of the inventive subject matter, may be combined with one another to form new embodiments not shown in the figures.

[0029] The components illustrated in the figures represent components that may or may not be present in various embodiments of the present disclosure described herein, so that the embodiments may include fewer or more components than those illustrated in the figures without departing from the scope of the present disclosure. Some components may be omitted or shown in phantom in one or more figures to reveal underlying components. Like numbers refer to like elements throughout.

[0030] The phrases "in an exemplary embodiment," "some embodiments," "various embodiments," and the like generally mean that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure and may be included in more than one embodiment of the present disclosure. Such phrases do not necessarily refer to the same embodiment.

[0031] The word "example" or "exemplary" is used herein to mean "serving as an example or illustration." Any implementation described herein as "exemplary" is not necessarily to be understood as preferred or advantageous over other implementations.

[0032] If the description of the figures states that a component, part, or feature is "preferably," "possibly," "typically," "optionally," or "for example" (or other such wording) included, or that a feature "may" be included, or that a feature "could" or "should" have a property, it is not required that a specific component or feature be included or exhibit the feature. Such components or features may be optionally included in some embodiments, but they may also be excluded. An embodiment not included in the figures may also include all features—provided they do not contradict each other—of the embodiments shown.

[0033] Fig. 1 shows a cross-section through a first embodiment of the electrical connector EV. The electrical connector EV serves to connect a measuring transducer to a measuring sensor of a magnetic-inductive flowmeter such that a measurement signal measured with the measuring sensor is transmitted to the measuring transducer and the measuring sensor can be operated with an operating signal generated by the measuring transducer. The measuring transducer has measuring and / or operating electronics configured to determine measured values ​​of a flow velocity-dependent measured variable based on the measured and transmitted measurement signal. According to the invention, the measuring sensor has a magnetic field-generating device, a first measuring electrode, and a second measuring electrode (see Fig. 4).Furthermore, the measuring and / or operating electronics has at least one shield driver which is configured to impress a shield signal onto at least one shield of the electrical connector EV.

[0034] The electrical connector EV comprises a connector protective sheath 1 designed to protect the sheathed signal cables and coaxial cables from mechanical influences. The connector protective sheath 1 is made of an insulating material, in particular polyvinyl chloride (PVC), polyethylene (PE), rubber, or polyurethane (PUR). Alternatively or additionally, the connector protective sheath 1 can comprise a fabric that increases mechanical strength.

[0035] Part of the electrical connector EV is also an outer shield 2, which extends at least partially within the connector's protective sheath 1. The outer shield is made of an electrically conductive material and serves as a shield against external electric fields and to shield the electric fields generated by signal cables and coaxial cables. For this purpose, the outer shield 2 is configured to be connected to an electrical reference potential when the sensor is connected to the transmitter via the electrical connector. The electrical reference potential can be provided at the sensor or at the transmitter.

[0036] The electrical connector EV has a first coaxial cable KK1, which extends at least partially within the outer shield 2. Coaxial cables are two-pole cables with a concentric structure. They usually consist of an inner conductor surrounded by a hollow cylindrical outer conductor at a constant distance. The outer conductor serves to shield the inner conductor from electromagnetic interference. The space, which is particularly hollow cylindrical, between the inner conductor and outer conductor is filled with an insulator or dielectric. The outer conductor is usually protected from the outside by an insulating, corrosion-resistant, and waterproof protective sheath. The first coaxial cable KK1 comprises a first coaxial cable inner conductor KI1 and a first coaxial cable outer conductor KA1.In use, the first coaxial cable inner conductor KI1 of the first coaxial cable KK1 is configured to connect the first measuring electrode to the measuring and / or operating electronics of the measuring transducer. The measurement signal determined by the first measuring electrode is transmitted to the measuring and / or operating electronics via the first coaxial cable inner conductor KI1. The first coaxial cable outer conductor KA1 of the first coaxial cable KK1, on the other hand, is configured to be connected to a shield driver of the measuring and / or operating electronics.

[0037] The shield driver is configured to apply the measurement signal transmitted via the inner conductor, or a shield signal derived and amplified therefrom, to the corresponding outer conductor. A suitable shield driver is taught in WO2011051004A1. According to the invention, multiple shield drivers can be provided, in particular one shield carrier for each coaxial cable, in which the outer conductor is used to shield the inner conductor.

[0038] The electrical connector EV further comprises a second coaxial cable KK2, which also extends at least partially within the outer shield 2. The second coaxial cable KK2 comprises a second coaxial cable inner conductor KI2 and a second coaxial cable outer conductor KA2. The second coaxial cable inner conductor KI2 of the second coaxial cable KK2 is configured to electrically connect the second measuring electrode of the measuring sensor to the measuring and / or operating electronics of the measuring transducer when the measuring transducer is connected to the measuring sensor via the electrical connector EV. The second coaxial cable outer conductor KA2 of the second coaxial cable KK2 is configured to be connected to the shield driver when the electrical connector EV connects the measuring sensor to the measuring transducer.

[0039] According to the invention, the electrical connector EV has a signal cable SK, which extends at least partially within the outer shield 2. The signal cable SK serves to transmit the operating signal with which the magnetic field generating device is operated. The operating signal can be a time-varying current signal or voltage signal. The signal cable SK comprises two insulated signal cable inner conductors SI1, SI2, which are twisted together. In use, the two signal cable inner conductors SI1, SI2 connect the magnetic field generating device to the measuring and / or operating electronics. The signal cable SK can also comprise a protective sheath that radially surrounds the twisted signal cable inner conductors SI1, SI2. The signal cable SK can have a reduced cable cross-section of less than 0.5 mm 2 , especially 0.38 mm 2 have.

[0040] In the event that the measuring sensor MA comprises a reference electrode for setting a reference potential in the flowing medium, the electrical connector EV further comprises a third coaxial cable KK3, which extends at least partially within the outer shield 2. The third coaxial cable KK3 comprises a third coaxial cable inner conductor KI3 and a third coaxial cable outer conductor KA3. The third coaxial cable inner conductor KI3 of the third coaxial cable KK3 is configured to electrically connect the reference electrode to the measuring and / or operating electronics when the measuring sensor is connected to the measuring transducer via the electrical connector EV. The third coaxial cable outer conductor KA3 of the third coaxial cable KK3 is configured to be connected to the shield driver of the measuring and / or operating electronics.Alternatively, a stranded wire can be used instead of a coaxial cable to connect the reference electrode to a reference potential.

[0041] If the measuring sensor comprises a level monitoring electrode, the electrical connector further comprises a fourth coaxial cable KK4, which extends at least partially within the outer shield 2. The fourth coaxial cable KK4 comprises a fourth coaxial cable inner conductor KI4 and a fourth coaxial cable outer conductor KA4. The fourth coaxial cable inner conductor KI4 of the fourth coaxial cable KK4 is designed to connect the level monitoring electrode to the measuring and / or operating electronics when the electrical connector connects the measuring sensor to the measuring transducer. Furthermore, the fourth coaxial cable outer conductor KA4 of the fourth coaxial cable KK4 is designed to be connected to the shield driver when a connection is made between the measuring sensor and the measuring transducer.The shield driver is designed to generate a shield signal depending on the transmitted measurement signal and to impress it onto the coaxial cable outer conductor KA4.

[0042] If the measuring sensor comprises a temperature sensor (see 1060 of Fig. 4) instead of a fill level monitoring electrode, the electrical connector EV has a fourth coaxial cable KK4, which extends at least partially within the outer shield 2. The fourth coaxial cable KK4 comprises a fourth coaxial cable inner conductor KI4 and a fourth coaxial cable outer conductor KA4. The fourth coaxial cable inner conductor KI4 of the fourth coaxial cable KK4 is configured to connect a first temperature sensor measuring output of the temperature sensor to a first temperature sensor measuring input of the measuring and / or operating electronics when the measuring sensor and the measuring transmitter are in communication. The fourth coaxial cable outer conductor KA4 of the fourth coaxial cable KK4 is configured to connect a second temperature sensor measuring output of the temperature sensor to a second temperature sensor measuring input of the measuring and / or operating electronics.The measuring and / or operating electronics, in turn, are designed to determine a measured value representing the current temperature of the medium based on the transmitted measuring signal.

[0043] Alternatively, the temperature sensor can be installed in addition to the level monitoring electrode. In this case, a fifth coaxial cable (not shown) is required for temperature measurement. Alternatively, a signal cable with two signal cable inner conductors can be used to transmit the temperature sensor's measurement signals instead of a coaxial cable.

[0044] The difficulty in designing the electrical connector EV is maintaining a substantially circular cross-section. This is necessary to route the electrical connector EV through a PG cable gland and seal it. The connector protective sheath 1, the coaxial cables KK1, KK2, KK3, KK4, and the signal cable SK are therefore dimensioned so that the electrical connector EV can be routed through a PG cable gland KV (e.g., with a 10.5 mm opening) and can also be sealed within it.

[0045] Fig. 2 shows a cross-section through a second embodiment of the electrical connector EV. The electrical connector EV shown essentially has the features of the first embodiment according to Fig. 1. Furthermore, the signal cable SK has a signal cable outer conductor SKA, within which the signal cable inner conductors SI1, SI2 extend at least in sections. The signal cable outer conductor SKA is in electrical contact, and in particular also in mechanical contact, with the outer shield 2 and is designed to shield the signal cable inner conductors SI1, SI2 from interference.

[0046] Fig. 3 shows a perspective view of a measuring sensor MA, which is connected to a remote measuring transducer MU via an electrical connector according to the invention (Fig. 1 or Fig. 2). The measuring signal and process data are sent to the measuring transducer MU via the electrical connector EV. Furthermore, the measuring sensor MA is supplied with energy and an operating signal by the electrical connector EV. The measuring transducer MU itself can have an energy storage device (e.g. accumulator, battery) and / or be supplied with electrical energy via a supply cable. Furthermore, the measuring transducer MU can have a radio module arranged therein, via which a wireless connection to an external receiver 400 can be established. The external receiver 400 can be a handheld device, in particular a smartphone or a tablet.The measuring and operating electronics MBE with at least one shield driver is arranged in the housing of the MU measuring transducer.

[0047] Fig. 4 shows a cross-section through a magnetic-inductive flowmeter 1000. The magnetic-inductive flowmeter 1000 has a measuring sensor MA, which is configured to determine a flow velocity-dependent measured variable of a medium that is guided through a measuring tube 1001. The measuring tube 1001 can be made of plastic, glass, or ceramic, or it can have a metallic support tube that has an electrically insulating inner lining (liner) made of plastic, ceramic, or glass on its inner surface. In order to determine the flow velocity-dependent measured variable, the measuring transducer MU has a magnetic field-generating device 1010 and at least two oppositely arranged measuring electrodes 1030, 1031 for tapping a flow velocity-dependent measuring voltage in the medium to be guided.In the illustrated embodiment, the magnetic field generating device 1010 is a two-coil system comprising two coils (e.g., cylindrical coils), each with a pole piece, which are arranged opposite one another on the measuring tube 1001, and a magnetic field guidance system that mechanically connects the two coils. Alternatively, the magnetic field generating device 1010 can also have only one coil or at least one or exactly two saddle coils. If saddle coils are provided, the magnetic field guidance system and the pole pieces can be omitted. The two measuring electrodes 1030, 1031 are each arranged in an opening in the measuring tube 1001 so that they are in contact with the medium when the medium is flowing. Alternatively, the measuring electrodes 1030, 1031 can also be configured to capacitively determine a flow velocity-dependent measured variable.In this case, the measuring tube 1001 would be completely electrically insulating, and the measuring electrodes 1030, 1031 would not come into contact with the medium being conveyed. Alternatively, more than two measuring electrodes 1030, 1031 could be provided.

[0048] The at least two measuring electrodes 1030, 1031 and the magnetic field-generating device 1010 itself are arranged in a sensor housing 1022 such that they are substantially completely enclosed or concealed by the sensor housing 1022, radially and parallel to a longitudinal direction of the measuring tube 1001. A level monitoring electrode 1060 and a reference electrode 1040 are arranged opposite one another in respective openings in the measuring tube 1001 and are each electrically connected to the operating and measuring electronics of the measuring transducer.

[0049] The magnetic-inductive flowmeter 1000 further comprises an electronics housing 1070 in which a sensor-transmitter interface 1024 is arranged. The sensor-transmitter interface 1024 comprises two circuit boards 1032", 1032", which are arranged essentially parallel to one another inside the electronics housing 1070. Alternatively, three or more circuit boards can be provided. This can be particularly necessary if more space is required due to the specification of larger distances between the electronic components and device connections. Alternatively, the additional third circuit board can be arranged non-parallel to the other two parallel circuit boards 1032", 1032", for example, at 90° or 45°.

[0050] The at least two measuring electrodes and the two coils are each electrically connected via cables to the sensor-transmitter interface 1024. The sensor-transmitter interface 1024 is connected to the electrical connector EV according to the invention, which connects the sensor-transmitter interface 1024 to the measuring and operating electronics of the transmitter MU (not shown, see Fig. 3). The electrical connector extends through a PV cable gland KV, which is arranged in an opening of the electronics housing 1070.

[0051] Alternatively, the sensor-transmitter interface 1024 can be omitted. In this case, the measuring electrodes and coils are connected directly to the measuring and operating electronics of the transmitter MU via the electrical connector EV.

Claims

PATENT CLAIMS 1. Electrical connector (EV) for connecting a measuring transducer (MU) to a measuring sensor (MA) of a magnetic-inductive flowmeter (1000), wherein the measuring sensor (MA) comprises a magnetic field generating device (1010), a first measuring electrode (1030) and a second measuring electrode (1031), wherein the measuring transducer (MU) comprises measuring and / or operating electronics (MBE) with at least one shield driver, wherein the electrical connector (EV) comprises: - a connector protective sheath (1); - an outer shield (2) which extends at least partially within the connector protective sheath (1), wherein the outer shield (2) is designed to be connected to an electrical reference potential, - a first coaxial cable (KK1) which extends at least partially within the outer shield (2), wherein the first coaxial cable (KK1) comprises a first coaxial cable inner conductor (KI1) and a first coaxial cable outer conductor (KA1), wherein the first coaxial cable inner conductor (KI1) of the first coaxial cable (KK1) is designed to connect the first measuring electrode (1030) to the measuring and / or operating electronics (MBE), wherein the first coaxial cable outer conductor (KA1) of the first coaxial cable (KK1) is designed to be connected to the shield driver; - a second coaxial cable (KK2) which extends at least partially within the outer shield (2), wherein the second coaxial cable (KK2) comprises a second coaxial cable inner conductor (KI2) and a second coaxial cable outer conductor (KA2), wherein the second coaxial cable inner conductor (KI2) of the second coaxial cable (KK2) is designed to connect the second measuring electrode (1031) to the measuring and / or operating electronics (MBE), wherein the second coaxial cable outer conductor (KA2) of the second coaxial cable (KK2) is designed to be connected to the shield driver; - a signal cable (SK) which extends at least partially within the outer shield (2), wherein the signal cable (SK) comprises two insulated signal cable inner conductors (SI1, SI2) which are twisted together, wherein the signal cable inner conductors (SI1, SI2) are designed to connect the magnetic field generating device (1010) to the measuring and / or operating electronics (MBE).

2. Electrical connector (EV) according to claim 1, wherein the signal cable (SK) comprises a signal cable outer conductor (SKA), wherein the signal cable inner conductors (SI1, SI2) extend at least partially within the signal cable outer conductor (SKA), wherein the signal cable outer conductor (SKA) is in electrical contact, and in particular also in mechanical contact, with the outer shield (2).

3. Electrical connector (EV) according to claim 1 or 2, wherein the measuring sensor (MA) comprises a reference electrode (1040), the electrical connector (EV) further comprising: - a third coaxial cable (KK3) which extends at least partially within the outer shield (2), wherein the third coaxial cable (KK3) comprises a third coaxial cable inner conductor (KI3) and a third coaxial cable outer conductor (KA3), wherein the third coaxial cable inner conductor (KI3) of the third coaxial cable (KK3) is designed to connect the reference electrode (1040) to the measuring and / or operating electronics (MBE), wherein the third coaxial cable outer conductor (KA3) of the third coaxial cable (KK3) is designed to be connected to the shield driver.

4. Electrical connector (EV) according to one of the preceding claims, wherein the measuring sensor (MA) comprises a level monitoring electrode (1050), the electrical connector (EV) further comprising: - a fourth coaxial cable (KK4) which extends at least partially within the outer shield (2), wherein the fourth coaxial cable (KK4) comprises a fourth coaxial cable inner conductor (KI4) and a fourth coaxial cable outer conductor (KA4), wherein the fourth coaxial cable inner conductor (KI4) of the fourth coaxial cable (KK4) is designed to connect the fill level monitoring electrode (1050) to the measuring and / or operating electronics (MBE), wherein the fourth coaxial cable outer conductor (KA4) of the fourth coaxial cable (KK4) is designed to be connected to the shield driver.

5. Electrical connector (EV) according to one of the preceding claims, wherein the measuring sensor (MA) comprises a temperature sensor (1060), the electrical connector (EV) further comprising: - a fourth coaxial cable (KK4) which extends at least partially within the outer shield (2), wherein the fourth coaxial cable (KK4) comprises a fourth coaxial cable inner conductor (KI4) and a fourth coaxial cable outer conductor (KA4), wherein the fourth coaxial cable inner conductor (KI4) of the fourth coaxial cable (KK4) is designed to connect a first temperature sensor measuring output of the temperature sensor (1060) to a first temperature sensor measuring input of the measuring and / or operating electronics (MBE), wherein the fourth coaxial cable outer conductor (KA4) of the fourth coaxial cable (KK4) is designed to connect a second temperature sensor measuring output of the temperature sensor (1060) to a second temperature sensor measuring input of the measuring and / or operating electronics (MBE).

6. Electrical connector (EV) according to one of the preceding claims, wherein the connector protective sheath (1), the coaxial cables (KK1, KK2, KK3, KK4) and the signal cable (SK) are dimensioned such that the electrical connector (EV) can be passed through a PG cable gland (KV) and sealed therein.

7. Flow meter comprising: - measuring sensor (MA), wherein the measuring sensor (MA) comprises a magnetic field generating device (1010), a first measuring electrode (1030) and a second measuring electrode (1031), - measuring transducer (MU), wherein the measuring transducer (MU) is offset from the measuring sensor (MA), wherein the measuring transducer (MU) comprises measuring and / or operating electronics (MBE) with at least one shield driver, wherein the measuring sensor (MA) and the measuring transducer (MU) are connected, in particular exclusively, via exactly one electrical connector (EV) according to one of the preceding claims.

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