Electrical connector and a magnetic-inductive flow meter

Abstract

The invention relates to an electrical connector for connecting a measuring transducer (MU) to a measuring sensor (MA) of a magnetic-inductive flowmeter, wherein the measuring sensor (MA) comprises a magnetic field generating device, a first measuring electrode (1030) and a second measuring electrode (1031), wherein the measuring transducer (MU) comprises measuring and / or operating electronics (MBE) with a shield driver, wherein the electrical connector comprises: - a connector protective sheath; - an outer shield (2) which extends at least partially within the connector protective sheath, wherein the outer shield (2) is configured 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 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 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 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 of the second coaxial cable (KK2) is configured to be connected to the shield driver; and - a signal cable 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 configured to connect the magnetic field generating device to the measuring and / or operating electronics (MBE).

Description

The invention relates to an electrical connection for connecting a measurement transmitter to a measurement pickup of a magnetoinductive flowmeter and magnetoinductive flowmeter.Magnetoinductive flow meters are used to determine the flow rate and / or the volumetric flow rate of a medium in a measuring tube. A magnetoinductive flowmeter includes a magnetic field generating device that generates a magnetic field perpendicular to the transverse axis of the measuring tube. For this purpose, usually single or multiple coils are used. In order to realize a predominantly homogeneous magnetic field, pole shoes are additionally shaped and attached in such a way that the magnetic field lines run substantially perpendicular to the transverse axis over the entire measuring tube cross section. A pair of electrodes attached to the lateral surface of the measuring tube absorbs an inductively generated electrical measurement 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 taken off depends on the velocity of the flowing medium according to Faraday's law of induction, the flow velocity and, with addition of a known measuring tube cross section, the volume flow of the medium can be determined from the measurement voltage.Depending on the application, it may be advantageous to arrange the measuring transducer of the magnetoinductive flowmeter remote from the measuring transducer. This means that the measurement transducer is neither directly nor indirectly connected to the measurement pickup. For this purpose, an electrical connector is necessary, which conducts the operating signal from the measurement transducer to the measurement transducer and transmits the measurement signal from the measurement transducer to the measurement transducer. Conventional electrical connectors cause a zero point error. The object of the invention is to provide a remedy for the problem.The object is achieved by the electrical connector according to claim 1 and the magneto-inductive flowmeter according to claim 7.The electrical connector according to the invention for connecting a measurement transmitter to a measurement transmitter of a magnetoinductive flowmeter, wherein the measurement transmitter comprises a magnetic field generating device, a first measurement electrodes and a second measurement electrode, wherein the measurement transmitter has measurement and / or operating electronics with at least one shield driver:a connector protective jacket;an outer shield which extends at least in sections within the connector protective jacket, wherein the outer shield is configured to be connected to an electrical reference potential,a first coaxial cable which extends at least in sections 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 measurement and / or operating electronics, wherein the coaxial cable outer conductor of the first coaxial cable is configured to be connected to the shield driver;a second coaxial cable which extends at least in sections 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 measurement and / or operating electronics, wherein the coaxial cable outer conductor is configured to be connected to the shield driver with the second coaxial cable;a signal cable which extends at least in sections 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 configured to connect the magnetic field generating device to the measurement and / or operating electronics.Advantageous embodiments of the invention are the subject matter of the dependent claims.One embodiment provides that the signal cable comprises a signal cable outer conductor, wherein the signal cable inner conductors extend at least in sections within the signal cable outer conductor, wherein the signal cable outer conductor is in electrical contact with the outer shield.One configuration provides that the measurement pickup comprises a reference electrode, wherein the electrical connector further comprises:a third coaxial cable which extends at least in sections 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 measurement and / or operating electronics, wherein the coaxial cable outer conductor of the third coaxial cable is configured to be connected to the shield driver.One embodiment provides that the measuring sensor comprises a fill level monitoring electrode, wherein the electrical connector further comprises:a fourth coaxial cable which extends at least in sections 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 fill level monitoring electrode to the measurement and / or operating electronics, wherein the coaxial cable outer conductor of the third coaxial cable is configured to be connected to the shield driver.In one embodiment, the measuring sensor comprises a temperature sensor, wherein the electrical connector further comprises:a fourth coaxial cable which extends at least in sections 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 a first temperature sensor measurement output of the temperature sensor to a first temperature sensor measurement input of the measurement and / or operating electronics, wherein the coaxial cable outer conductor of the fourth coaxial cable is configured to connect a second temperature sensor measurement output of the temperature sensor to a second temperature sensor measurement input of the measurement and / or operating electronics.One embodiment provides that the connector protective jacket, the coaxial cables and the signal cable are dimensioned such that the electrical connector can be passed through a PG cable screw connection.The flowmeter according to the invention, in particular the magnetoinductive flowmeter, comprises:measuring transducers, wherein the measuring transducer comprises a magnetic field generating device, a first measuring electrode and a second measuring electrode,measuring transducers, wherein the measurement transducer is offset toward the measurement transducer, wherein the measurement transducer comprises measurement and / or operating electronics with at least one shield driver, wherein the measurement transducer and the measurement transducer are connected, in particular exclusively, via exactly one electrical connector according to one of the preceding claims.The invention is explained in more detail with reference to the following figures. It shows: FIG. 1 shows a cross section through a first embodiment of the electrical connector; FIG. 2 shows a cross section through a second embodiment of the electrical connector; FIG. 3 : a measurement pickup which is connected to a remote measurement transmitter via an electrical connector according to the invention; and FIG. 4 shows a cross section through a magneto-inductive flowmeter.Some aspects of the present disclosure will be described in more detail below with reference to the accompanying drawings. The figures show some, but not all, embodiments of the disclosure. Indeed, these disclosures may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Different embodiments, each of which shows individual details of the subject matter according to the invention, can be combined with one another to form new embodiments not shown in the figures.The components depicted in the figures represent components that may or may not be present in various embodiments of the present disclosure described herein, such that the embodiments may include fewer or more components than those depicted in the figures without departing from the scope of the present disclosure. Some components may be omitted from one or more figures or shown in phantom to visualize the underlying components. Like numbers refer to like elements throughout.The terms "in an exemplary embodiment," "some embodiments," "various embodiments," and the like generally mean that the particular feature, structure, or characteristic following the term 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 terms need not necessarily refer to the same configuration.The word "example" or "exemplary" is used herein in the sense of "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.When the description of the figures indicates that a component, component, or feature is included or "may be included (or some other such formulation), "preferably", "possibly", "typically", "optionally", or "for example" (or some other such formulation), a feature may have a property "could" or "should", it is not necessary that a particular component or feature be included or have the feature. Such components or features may be optionally included in some embodiments, but may also be excluded. A configuration not included in the figures can also include all features-insofar as they do not conflict-of the shown configurations.FIG. 1 shows a cross section through a first embodiment of the electrical connector EV. The electrical connector EV serves to connect a measurement transducer to a measurement pickup of a magnetoinductive flowmeter in such a way that a measurement signal measured by the measurement pickup is transmitted to the measurement transducer and the measurement pickup can be operated with an operating signal generated by the measurement transducer. The measurement transmitter has measurement and / or operating electronics which are configured to determine measured values of a flow-speed-dependent measured variable on the basis of 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 measurement and / or operating electronics comprise at least one shield driver, which is configured to apply a shield signal to at least one shield of the electrical connector EV.The electrical connector EV comprises a connector protection jacket 1 which is configured to protect the sheathed signal cables and coaxial cables from mechanical influences. The connector protective jacket 1 is formed from an insulating material, in particular from polyvinyl chloride (PVC), polyethylene (PE), rubber or polyurethane (PUR). Alternatively or additionally, the connector protective jacket 1 can comprise a fabric which increases the mechanical strength.A part of the electrical connector EV is also an outer shield 2 which extends at least in sections within the connector protective jacket 1. The outer shield is formed of an electrically conductive material and serves to shield external electric fields and shield the electric fields generated by signal cables and coaxial cables from the outside. For this purpose, the outer shield 2 is configured to be connected to a reference electrical potential when the transducer is connected to the transducer via the electrical connector. The electrical reference potential can be provided at the measurement pickup or at the measurement transmitter.The electrical connector EV has a first coaxial cable KK 1, which extends at least in sections within the outer shield 2. Coaxial cables are two-pole cables having a concentric structure. They usually consist of an inner conductor which is surrounded at a constant distance by a hollow cylindrical outer conductor. The outer conductor serves to shield the inner conductor from electromagnetic interference. The, in particular hollow cylindrical, intermediate space between 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 watertight protective jacket. The first coaxial cable KK 1 includes a first coaxial cable inner conductor KI 1 and a first coaxial cable outer conductor KA 1. 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 measurement and / or operating electronics of the measurement transmitter. Via the first coaxial inner conductor KI1, the measurement signal determined by means of the first measuring electrode is conducted to the measurement and / or operating electronics. The first coaxial cable outer conductor KA 1 of the first coaxial cable KK 1, on the other hand, is configured to be connected to a shield driver of the measurement and / or operating electronics.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 screen driver for this purpose is taught in WO2011051004A1. According to the invention, a plurality of shield drivers can be provided, in particular a shield carrier for each coaxial cable, in which the outer conductor is used to shield the inner conductor.The electrical connector EV furthermore has a second coaxial cable KK 2, which likewise extends at least in sections within the outer shield 2. The second coaxial cable KK 2 includes a second coaxial cable inner conductor KI 2 and a second coaxial cable outer conductor KA 2. In this case, the second coaxial cable inner conductor KI 2 of the second coaxial cable KK 2 is configured to electrically connect the second measuring electrode of the measurement pickup to the measurement and / or operating electronics of the measurement pickup when the measurement pickup is connected to the measurement pickup via the electrical connector EV. The second coaxial cable outer conductor KA 2 of the second coaxial cable KK 2 is configured to be connected to the shield driver when the electrical connector EV connects the transducer to the transducer.According to the invention, the electrical connector EV has a signal cable SK which extends at least in sections within the outer shield 2. The signal cable SK is used 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 SI 1, SI 2 connect the magnetic field generating device to the measurement and / or operating electronics. The signal cable SK can likewise comprise a protective sheath which radially surrounds the twisted signal cable inner conductors SI 1, SI 2. The signal cable SK can have a reduced cable cross section of less than 0.5 mm 2, in particular of 0.38 mm 2.In the case that the measuring transducer MA comprises a reference electrode for setting a reference potential in the flowing medium, the electrical connector EV further comprises a third coaxial cable KK 3, which extends at least in sections within the outer shield 2. The third coaxial cable KK 3 includes a third coaxial cable inner conductor KI 3 and a third coaxial cable outer conductor KA 3. The third coaxial cable inner conductor KI 3 of the third coaxial cable KK 3 is configured to electrically connect the reference electrode to the measurement and / or operating electronics when the measurement pickup is connected to the measurement pickup via the electrical connector EV. The third coaxial cable outer conductor KA 3 of the third coaxial cable KK 3 is configured to be connected to the shield driver of the measurement and / or operating electronics. Alternatively, instead of a coaxial cable, a stranded wire can also be used to connect the reference electrode to a reference potential.In the case that the measuring sensor comprises a fill level monitoring electrode, the electrical connector further comprises a fourth coaxial cable KK 4, which extends at least in sections within the outer shield 2. The fourth coaxial cable KK 4 comprises a fourth coaxial cable inner conductor KI 4 and a fourth coaxial cable outer conductor KA 4. The fourth coaxial cable inner conductor KI 4 of the fourth coaxial cable KK 4 is configured to connect the fill level monitoring electrode to the measurement and / or operating electronics when the electrical connector connects the measurement pickup to the measurement transmitter. At this time, the fourth coaxial cable outer conductor KA4 of the fourth coaxial cable KK4 is configured to be connected to the shield driver when a connection between the transducer and the transducer occurs. The shield driver is correspondingly configured to generate a shield signal depending on the transmitted measurement signal and to apply it to the coaxial cable outer conductor KA 4.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 KK 4, which extends at least in sections within the outer shield 2. The fourth coaxial cable KK 4 includes a fourth coaxial cable inner conductor KI 4 and a fourth coaxial cable outer conductor KA 4. The fourth coaxial cable inner conductor KI4 of the fourth coaxial cable KK4 is configured to connect a first temperature sensor measurement output of the temperature sensor to a first temperature sensor measurement input of the measurement and / or operating electronics when the measurement pickup and the measurement transmitter are in communication. The fourth coaxial cable outer conductor KA 4 of the fourth coaxial cable KK 4 is configured to connect a second temperature sensor measurement output of the temperature sensor to a second temperature sensor measurement input of the measurement and / or operating electronics. The measurement and / or operating electronics in turn are configured to determine a measurement value representing the current temperature of the medium on the basis of the transmitted measurement signal.Alternatively, the temperature sensor can also be provided in addition to the fill level monitoring electrode. In this case, another fifth coaxial cable (not shown) is necessary for temperature measurement. Alternatively, a signal cable with two signal cable inner conductors can be used instead of a coaxial cable for the transmission of the measurement signals of the temperature sensor.The difficulty in designing the electrical connector EV is maintaining a substantially round cross section. This is necessary in order to be able to pass the electrical connector EV through a PG cable gland and to seal it. The connector protective jacket 1, the coaxial cables KK 1, KK 2, KK 3, KK 4 and the signal cable SK are therefore dimensioned such that the electrical connector EV can be passed through a PG cable gland KV (e.g. with a 10.5 mm opening) and can also be sealed therein.FIG. 2 shows a cross section through a second configuration of the electrical connector EV. The illustrated electrical connector EV substantially comprises the features of the first embodiment according to FIG. 1. In addition, the signal cable SK has a signal cable outer conductor SKA, within which the signal cable inner conductors SI 1, SI 2 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 configured to shield the signal cable inner conductors SI 1, SI 2 from faults.FIG. 3 shows a perspective view of a measurement pickup MA, which is connected to a remote measurement pickup MU via an electrical connector according to the invention (FIG. 1 or FIG. 2 ). The measurement signal and process data are transmitted to the measurement transmitter MU via the electrical connector EV. Furthermore, the measuring sensor MA is supplied with energy and an operating signal through the electrical connector EV. The measurement transmitter MU itself can have an energy storage device (e.g. accumulator, battery) and / or can be supplied with electrical energy via a supply cable. Furthermore, the measurement transmitter 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 measurement and operating electronics MBE with at least one screen driver are arranged in the housing of the measurement transmitter MU.FIG. 4 shows a cross section through a magneto-inductive flowmeter 1000. The magnetoinductive flowmeter 1000 has a measuring sensor MA, which is designed to ascertain a flow-speed-dependent measured variable of a medium, which is guided through a measuring tube 1001. The measuring tube 1001 can be formed from plastic, glass or ceramic or have a metallic carrier tube which has an electrically insulating inner cladding (liner) made from plastic, ceramic or glass on the inner lateral surface. In order to determine the flow-speed-dependent measured variable, the measurement transmitter MU has a magnetic-field-generating device 1010 and at least two measurement electrodes 1030, 1031 arranged opposite one another for tapping a flow-speed-dependent measurement voltage in the medium to be conveyed. In the embodiment depicted, the magnetic field generating device 1010 is a two-coil system which comprises two coils (e.g. cylindrical coils) each having a pole shoe, which are arranged opposite one another on the measuring tube 1001, and has a magnetic field guidance system which mechanically connects the two coils to one another. Alternatively, the magnetic field generating device 1010 can also have only one coil or comprise at least one or exactly two saddle coils. If saddle coils are provided, the magnetic field guidance system and the pole shoes can be dispensed with. The two measuring electrodes 1030, 1031 are each arranged in an opening in the measuring tube 1001, so that they are in medium contact with flowing medium. Alternatively, the measuring electrodes 1030, 1031 can also be configured to capacitively determine a flow-speed-dependent measurement variable. In this case, the measuring tube 1001 would be embodied to be completely electrically insulating and the measuring electrodes 1030, 1031 would not come into contact with the medium to be guided. Alternatively, more than just two measuring electrodes 1030, 1031 can also be provided.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 surrounded or concealed by the sensor housing 1022 radially and parallel to a longitudinal direction of the measuring tube 1001. A fill level monitoring electrode 1060 and a reference electrode 1040 are arranged opposite each other in respective openings in the measuring sensor 1001 and are each electrically connected to the operating and measuring electronics of the measuring transducer.The magnetoinductive flowmeter 1000 further comprises an electronics housing 1070, in which a transducer-transducer interface 1024 is arranged. The transducer-transducer interface 1024 has two printed circuit boards 1032', 1032" which are arranged substantially parallel to one another in the interior of the electronics housing 1070. Alternatively, three printed circuit boards or more can also be provided. This may be necessary in particular when more space is required due to the provision of larger distances between the electronic components and device connections. Alternatively, the additional third printed circuit board can be arranged non-parallel to the other two printed circuit boards 1032', 1032" arranged in parallel, i.e. e.g. 90° or 45°.The at least two measuring electrodes and the two coils are each electrically connected via cables to the measuring transducer-measuring transducer interface 1024. The transducer-transducer interface 1024 is connected to the electrical connector EV according to the invention, which connects the transducer-transducer interface 1024 to the measurement and operating electronics of the transducer MU (not shown, see FIG. 3 ). The electrical connector extends through a PV cable gland KV disposed in an opening of the electronics housing 1070.Alternatively, the transducer-transducer interface 1024 may be omitted. In this case, the measuring electrodes and the coils are connected directly via the electrical connector EV to the measuring and operating electronics of the measuring transducer MU.References included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedWO 2011051004A1

[0024]

Claims

Electrical connector (EV) for connecting a measurement transmitter (MU) to a measurement transmitter (MA) of a magnetoinductive flowmeter (1000), wherein the measurement transmitter (MA) comprises a magnetic field generating device (1010), a first measurement electrodes (1030) and a second measurement electrode (1031), wherein the measurement transmitter (MU) comprises measurement and / or operating electronics (MBE) with at least one shield driver, wherein the electrical connector (EV) comprises: - a connector protective jacket (1); - an outer shield (2) which extends at least in sections within the connector protective jacket (1), wherein the outer shield (2) is configured to be connected to an electrical reference potential, - a first coaxial cable (KK1), which extends at least in sections 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 configured to connect the first measuring electrode (1030) to the measurement and / or operating electronics (MBE), wherein the first coaxial cable outer conductor (KA1) of the first coaxial cable (KK1) is configured to be connected to the shield driver; a second coaxial cable (KK2) which extends at least in sections 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 configured to connect the second measuring electrode (1031) to the measurement and / or operating electronics (MBE), wherein the second coaxial cable outer conductor (KA2) of the second coaxial cable (KK2) is configured to be connected to the shield driver; a signal cable (SK) which extends at least in sections 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 configured to connect the magnetic field-generating device (1010) to the measurement and / or operating electronics (MBE).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 in sections 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).Electrical connector (EV) according to Claim 1 or 2, wherein the measurement pickup (MA) comprises a reference electrode (1040), wherein the electrical connector (EV) furthermore comprises: - a third coaxial cable (KK3) which extends at least in sections 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 configured to connect the reference electrode (1040) to the measurement and / or operating electronics (MBE), wherein the third coaxial cable outer conductor (KA3) of the third coaxial cable (KK3) is configured to be connected to the shield driver.Electrical connector (EV) according to one of the preceding claims, wherein the measuring sensor (MA) comprises a fill level monitoring electrode (1050), wherein the electrical connector (EV) further comprises: - a fourth coaxial cable (KK4) which extends at least in sections 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 configured to connect the fill level monitoring electrode (1050) to the measurement and / or operating electronics (MBE), wherein the fourth coaxial cable outer conductor (KA4) of the fourth coaxial cable (KK4) is configured to be connected to the shield driver.Electrical connector (EV) according to one of the preceding claims, wherein the measurement pickup (MA) comprises a temperature sensor (1060), wherein the electrical connector (EV) further comprises: - a fourth coaxial cable (KK4) which extends at least in sections 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 configured to connect a first temperature sensor measurement output of the temperature sensor (1060) to a first temperature sensor measurement input of the measurement and / or operating electronics (MBE), wherein the fourth coaxial cable outer conductor (KA4) of the fourth coaxial cable (KK4) is configured to connect a second temperature sensor measurement output of the temperature sensor (1060) to a second temperature sensor measurement input of the measurement and / or operating electronics (MBE).Electrical connector (EV) according to one of the preceding claims, wherein the connector protective jacket (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 can be sealed therein.Flow measuring device, comprising: - measurement pickup (MA), wherein the measurement pickup (MA) comprises a magnetic field-generating device (1010), a first measurement electrode (1030) and a second measurement electrode (1031), - measurement pickup (MU), wherein the measurement pickup (MU) is offset towards the measurement pickup (MA), wherein the measurement pickup (MU) comprises measurement and / or operating electronics (MBE) with at least one shield driver, wherein the measurement pickup (MA) and the measurement pickup (MU) are connected, in particular exclusively, via exactly one electrical connector (EV) according to one of the preceding claims.

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