Measuring transducer and field device

Abstract

The invention relates to a measuring transducer (1) for a field device (2) used in metrology and automation for processing measurement signals from a sensor (3) and providing a measured value of at least one process variable, comprising: a housing (4) having a housing body (5), the invention relates to a housing (1) for a motor vehicle, comprising a housing body (2) having, in the housing interior thereof, at least one housing chamber (6) enclosed by a housing wall (7), an electronics unit (10) having at least one electronics module (11i), which in each case has a module holder (12i) and at least one electronics component (13i) arranged in the module holder (12i), characterized in that the electronics component (13i) is arranged in the module holder (12i). The module holder (12i) has an in particular fully electrically conductive module holder body (14) and is designed to shield at least one electronic component (13i) from undesired electrical or electromagnetic effects.

Description

Field of the Invention

[0001] The present invention relates to a measuring transducer for a field device for metering and automation, which is used to process measurement signals from sensors and provide measurement values of at least one process variable, and also relates to a field device for metering and automation for monitoring and / or determining at least one process variable of a medium. Background Art

[0002] In automation, especially in process automation, field devices for capturing and / or modifying process variables are often used. To detect process variables, sensors integrated into, for example, level measurement devices, flow meters, pressure and temperature measurement devices, pH - redox potentiometers, conductivity meters, etc. are used to detect corresponding process variables such as level, flow, pressure, temperature, pH level or conductivity. Actuators, such as, for example, valves or pumps, are used to affect process variables. Thus, the flow rate of a fluid in a pipeline section or the level in a container can be changed by means of an actuator. In principle, all devices that are process - oriented and supply or process process - related information are called field devices. In the context of the present invention, a "field device" thus also refers to remote I / O, radio adapters, or generally electronic measurement components arranged at the field level.

[0003] Field devices are especially selected from the group consisting of flow meters, level measurement devices, pressure measurement devices, temperature measurement devices, limit level measurement devices and / or analytical measurement devices.

[0004] Flow meters are especially Coriolis, ultrasonic, vortex, thermal and / or electromagnetic induction flow meters.

[0005] Level measurement devices are especially microwave level measurement devices, ultrasonic level measurement devices, time - domain reflectometry measurement devices, radiation measurement level measurement devices, capacitance level measurement devices, inductive level measurement devices and / or temperature - sensitive level measurement devices.

[0006] Pressure measurement devices are especially absolute, relative or differential pressure devices.

[0007] Temperature measurement devices are especially measurement devices with thermocouples and / or temperature - dependent resistors.

[0008] Limit level measurement devices are especially vibration limit level measurement devices, ultrasonic limit level measurement devices and / or capacitance limit level measurement devices.

[0009] Analytical measurement devices are especially pH sensors, conductivity sensors, oxygen and reactive oxygen sensors, (spectro) photometric sensors and / or ion - selective electrodes.

[0010] The electronic device unit for processing the measurement signal of a sensor and providing a measured value of a monitored process variable is usually located in the measuring transducer. For example, DE 20 2014 101 560 U1 discloses an electronic device unit of a fluid sensor arranged in the housing of a measuring transducer. The electronic device unit includes modular plastic spacers, each of which holds an electronic component.

[0011] To shield the electronic device unit from unwanted electrical or electromagnetic effects, the housing of the measuring transducer is usually made of metal. For a housing made of a non-conductive material, alternative grounding and EMC concepts are required. For example, a shielding plate can be provided inside the housing, which is designed to shield the electronic device unit. It is obvious that the metal housing of existing products cannot be easily replaced by a plastic housing. Summary of the Invention

[0012] The object of the present invention is to solve this problem.

[0013] This object is achieved by a measuring transducer according to claim 1 and a field device according to claim 15.

[0014] A measuring transducer for a field device for metering and automation, the measuring transducer being configured to process a measurement signal from a sensor and provide a measured value of at least one process variable, the measuring transducer comprising:

[0015] - a housing having a housing body, the housing body having at least one housing chamber enclosed by a housing wall in its interior,

[0016] - an electronic device unit having at least one electronic device module, the at least one electronic device module having a module holder and electronic device components arranged in the module holder,

[0017] characterized in that the module holder has a module holder body, which is in particular fully conductive, and wherein the electronic device module, in particular the module holder, is designed to shield at least one electronic device component from unwanted electrical or electromagnetic effects.

[0018] The advantage of this solution is that the shielding of the electronic device unit is accomplished not via the housing but via the electronic device unit itself. To this end, the electronic device unit has at least one module holder, which is designed such that the electronic device components arranged in the module holder neither interfere with other devices through unwanted electrical or electromagnetic effects nor are interfered with by other devices. Thus, the electronic device unit itself is electromagnetic compatible (EMC). It is particularly advantageous if the electronic device unit, in particular at least one module holder, complies with the applicable EMC standards. The European EMC Directive defines electromagnetic compatibility as "the ability of a device, installation or system to operate satisfactorily in its electromagnetic environment without introducing unacceptable electromagnetic interference to all devices, installations or systems present in that environment. By providing a conductive module holder, the housing does not need to have shielding properties.

[0019] Furthermore, the provision of a conductive module holder, for example made of metal, results in improved heat dissipation from the heat generated by the electronic device components to the interior of the housing.

[0020] Advantageous embodiments of the invention are the subject of the dependent claims.

[0021] One embodiment provides that the housing body has a first housing opening that can be closed or closed by means of a cover,

[0022] wherein the electronic device unit is designed such that it can pass through the first housing opening, in particular in the direction of the housing longitudinal axis.

[0023] One embodiment provides that at least one electronic device module has a connector via which the module holder body can be electrically connected to a reference potential or electrically connected to a reference potential.

[0024] The reference potential can be, for example, ground potential. The connector is preferably located directly on the module holder in order to use a shielded cable for connection to the connector close to the source of interference. This ensures that the interference generated by the electronic device components can be transferred via the shielded connection immediately after generation.

[0025] In electromagnetic compatibility (EMC), two aspects are crucial: the interference from the electronic device will not escape and interfere with other devices, and the interference from the outside will not adversely affect the function of the device itself. In particular, shielded cables help to make the communication more robust (i.e., less susceptible to interference).

[0026] One embodiment provides that the housing body has a second housing opening through which at least the connector can be accessed,

[0027] wherein the second housing opening can also be closed or closed by a cover.

[0028] The advantage of the design is the easier access to the connectors and the resulting possibility of using multiple electronic device modules. In addition, in addition to the connectors for the reference potential, additional connectors (power / IO / modem) can be provided, which are preferably also accessible via the second housing opening.

[0029] One embodiment provides that at least one electronic device module on which the connectors are arranged includes power electronics.

[0030] Generally, interference in the power supply is intercepted and directly transferred via the power supply unit. Therefore, it is advantageous for the connectors to be located directly on the module holder, on which the power electronics are also installed.

[0031] Typical components of the power electronics are fuses for preventing overcurrent, diodes for preventing overvoltage, various filter elements (e.g., capacitors, chokes, resistors) and / or bridge rectifiers (e.g., AD converters). The safety elements and filter elements are ideally located directly at the connectors in the device, so that all other components connected downstream are safe and protected from external interference.

[0032] One embodiment provides that the housing has only one housing opening, which is used to insert the electronic device into the unit and connect the reference potential to the connectors in particular.

[0033] For small housing sizes, everything is installed and connected through one housing opening. The advantage of this design is a consistent assembly direction in production. In addition, the customer has access in the usual orientation. For large housing sizes, the installation is done through the first housing opening and the connection is done through the second housing opening. Another advantage is the space savings compared to multiple housing openings. Each additional housing opening requires space or an extension of the housing size.

[0034] One embodiment provides that the measuring amplifier is arranged in the housing chamber, between at least one electronic device module and the housing base of the housing.

[0035] The housing base at least separates the housing from the sensor installed in the immediate vicinity. A cable also extends through the housing base, and the measurement signal from the sensor is transmitted to the measuring amplifier via the housing base. It is advantageous if the distance between the measuring amplifier and the sensor is as small as possible.

[0036] One embodiment provides that there is a partition wall between the module holder and the measuring amplifier, which is designed to shield the measuring amplifier from the electrical or electromagnetic effects generated by at least one electronic device component.

[0037] The measurement signal sent from the sensor to the measurement amplifier is sensitive to interference and must therefore be shielded. In order to prevent interference generated by the electronic device components from distorting the measurement signal, it is advantageous to provide a partition wall with shielding properties between the electronic device components and the measurement amplifier. The partition wall can be perforated and / or ribbed. This is used to improve heat dissipation by convection and / or to allow the passage of cables. In addition, the partition wall can be designed as an integral part of a separate component or module holder.

[0038] One embodiment provides that a fastening device is arranged in a housing chamber, and at least one electronic device module can be connected to the sensor via the fastening device.

[0039] Wherein, the fastening device is designed to be particularly fully conductive and in electrical contact with the electronic device unit - in particular with the first electronic device module - and preferably with the module holder.

[0040] This ensures a direct electrical connection and the best possible electrical connection between the sensor and the electronic device module.

[0041] One embodiment provides that the electrical connection between the sensor - in particular the conductive part of the sensor - and the connector is achieved only via the fastening device.

[0042] Therefore, the electrical connection between the sensor and the electronic device unit or the electronic device module is independent of the housing material and the electrical housing properties. The electrical structure of the electronic device unit remains the same with or without a conductive housing material.

[0043] One embodiment provides that the fastening device has an interior in which the measurement amplifier is arranged.

[0044] To achieve sufficient shielding of the measurement amplifier, it is advantageous if it is surrounded by a metal body. It is particularly advantageous if the fastening device provided for the mechanical connection of the sensor to the electronic device unit is also designed and constructed to shield the measurement amplifier from unwanted electrical and electromagnetic effects. This results in a more compact design.

[0045] One embodiment provides that the fastening device has a fastening device opening through which the measurement amplifier can be electrically connected to at least one electronic device module.

[0046] One embodiment provides that the electronic device unit includes a particularly conductive module holder cover which is designed to shield at least one electronic device component from unwanted electrical or electromagnetic effects.

[0047] The module holder cover provides shielding against external EMC interference generated by the covered electronic device assembly and shields the covered electronic device assembly from the influence of external EMC interference. The module holder cover can be designed as a separate component or an integral part of the module holder.

[0048] One embodiment provides that at least one electronic device assembly is arranged on the module holder cover and is insensitive to unwanted electrical or electromagnetic effects.

[0049] One embodiment provides that the module holder at least partially has a circumferential collar that carries the electronic device assembly in the region bounded by the collar.

[0050] The collar at least partially encloses the electronic device assembly. This is used to shield the electronic device assembly from the influence of EMC interference. In addition, the collar is designed and configured to absorb the heat of the electronic device assembly and release it to the surrounding environment inside the housing. On the one hand, heat dissipation occurs automatically through the surface of the holder, which is itself larger than the surface of the electronic device assembly, and on the other hand, it can also be forced to be connected to other module holders with a large area and good thermal conductivity and ultimately be forced to be connected to the housing or preferably at least partially metallic sensors.

[0051] One embodiment provides that the module holder has a base that is particularly fully conductive and fills at least most of the region bounded by the collar.

[0052] The base can be perforated and / or ribbed. This is used to improve heat dissipation and / or allow the passage of cables. In addition, the base can be designed as a separate component or an integral part of the module holder. In an advantageous embodiment, the base of the partition wall corresponds to the module holder.

[0053] One embodiment provides that the electronic device assembly includes a circuit board having measurement and / or operation circuits and / or a circuit board for voltage conversion or regulation.

[0054] One embodiment provides that the module holder has a lateral opening for an electrical plug connector that is in electrical contact with the electronic device assembly arranged in the corresponding module holder, and a plug with a cable can be inserted into the electrical plug connector.

[0055] One embodiment provides that the electronic device unit includes at least two electronic device modules,

[0056] wherein at least two electronic device modules are stacked on top of each other.

[0057] According to this design, the electronic device unit is a modular system. By using more than one electronic device module, a customer-specific configuration can be achieved for the requirements of the electronic device components and the measuring transducer. The corresponding electronic device components are usually different, i.e., they perform different functions. For example, one electronic device module can include operating, measuring, and / or evaluating circuits, and another electronic device module can include a voltage converter. The modularity also makes the electronic device unit easy to expand. This is particularly advantageous if the customer wishes to provide additional signal outputs (e.g., fieldbus) in the measuring transducer.

[0058] One embodiment provides that, when viewed in the direction of the longitudinal axis of the housing, the module holders of at least two electronic device modules have substantially the same profile.

[0059] One embodiment provides that at least two electronic device modules are connected to each other via fastening elements, which are designed in particular to be conductive.

[0060] One embodiment provides that the module holders are stacked on top of each other at their axial edges, which are in particular conductive.

[0061] The field device for metering and automation for monitoring and / or determining at least one process variable of a medium according to the invention comprises:

[0062] - a sensor for detecting at least one measurement signal representing the process variable of the medium,

[0063] - a measuring transducer according to any one of the preceding claims, having measuring transducer electronics designed to process the measurement signal from the sensor and provide a measured value of at least one process variable,

[0064] wherein the sensor is mechanically and electrically connected to the measuring transducer. Description of the Drawings

[0065] The invention is explained in more detail with reference to the following drawings, in which:

[0066] Figure 1 two views of the design of the field device are shown;

[0067] Figure 2 the design of the internal part of the measuring transducer - in particular the electronic device unit - is shown; and

[0068] Figure 3 an exploded view of the design of the electronic device unit is shown. Detailed Description of the Invention

[0069] Figure 1Shows a view of an embodiment of a field device 2 for metering and automation according to the invention, which is used to monitor and / or determine at least one process variable of a medium, and has a sensor 3 and a measuring transducer 1 that are mechanically and electrically connected to each other. Alternatively, the measuring transducer 1 can also be only electrically connected to the sensor 3 without being mechanically connected. The sensor 3 is designed to detect at least one measurement signal representing the process variable of the medium. The sensor 3 can be, for example, a measuring sensor of a Coriolis flowmeter, a magnetic induction flowmeter, a magnetic induction flowmeter probe, a thermal flowmeter, a vortex flowmeter, or an ultrasonic flowmeter. The measuring transducer 1 has a housing 4, which has two housing openings 8 and 16 closed by a cover 9. The housing 4 has a preferably electrically insulating housing body 5, and at least one housing chamber 6 is located inside the housing body. Therefore, the housing 4 can be made of electrically insulating plastic. The housing body 5 can be formed as one piece or multiple parts. In the illustrated embodiment, there is exactly one housing chamber 6 inside the housing. The housing chamber 6 is bounded by a housing wall 7. The housing 4 is mechanically connected to the sensor 3. In addition, the housing 4 has four feed-throughs 25 for cables, which are used for cables supplying power voltage to the electronic device unit, grounding cables, and / or cables for transmitting measurement values to a higher-level process monitoring device.

[0070] In a second view, the housing chamber 6 is viewed through the two housing openings 8 and 16. The first housing opening 8 and the second housing opening 16 can each be closed by a cover 9. The electronic device unit 10 is designed such that it can pass through the first housing opening 8, particularly in the direction of the longitudinal axis of the housing. This means that the electronic device unit 10 can be inserted and removed through the first housing opening 8. The measuring transducer electronics are arranged in the housing chamber and are designed to process the measurement signal from the sensor 3 and provide a measurement value of at least one process variable. The measuring transducer electronics are at least partially formed by an electronic device component that is part of the electronic device unit 10 (see Figure 3 ). The electronic device unit 10 can be accessed via the second housing opening 16. The installer can then pass a cable through one of the feed-throughs via the second housing opening 16 and connect it to the electronic device unit 10.

[0071] Figure 2A more detailed view of the electronic device unit 10 is shown. The electronic device unit 10 includes at least one electronic device module 11a. In the illustrated embodiment, more than the at least one electronic device module 11a are shown. Overall, the illustrated embodiment has four electronic device modules 11a, 11b, 11c, 11d, which are designed as separate components that are directly stacked on top of each other. However, modular spacers can also be provided between the individual electronic device modules 11i, in which no electronic device components are arranged. These serve as placeholder elements. The electronic device modules 11i are designed such that they shield the electronic device components arranged therein from unwanted electrical or electromagnetic effects and from unwanted electrical or electromagnetic effects generated by the electronic device components. The electronic device module 11c has at least one connector 15i via which it can be electrically connected to a reference potential. In the illustrated embodiment, the electronic device module 11c has exactly two connectors 15a, 15b. In the illustrated embodiment, the electronic device components arranged in the electronic device module 11c consist of power electronics 24.

[0072] A module holder cover 21, which is in particular conductive, is arranged on the electronic device module 11a and is designed to shield at least one covered electronic device component from unwanted electrical or electromagnetic effects. In the illustrated embodiment, the module holder cover 21 is a separate component that is placed on the electronic device module 11a. On the module holder cover 21, at least one electronic device component is arranged that is insensitive to unwanted electrical or electromagnetic effects. For example, connectors for a display or service port or plugs for rewriting or updating the stored software can be arranged on the module holder cover 21.

[0073] The electronic device unit 10 is connected to the sensor 3 via a fastening device 19. Below the electronic device unit 10, i.e., between the electronic device unit 10 and the sensor 3 and / or the housing base 18, a measurement amplifier 17 is arranged, which is designed to receive the measurement signal of the sensor 3, amplify the measurement signal, and forward it to a measurement and / or evaluation circuit. Additionally, the fastening device 19 is designed to shield the measurement amplifier 17 from unwanted electrical or electromagnetic effects. The electrical connection of the measurement amplifier 17 to the electronic device unit 10 is realized via a cable (in particular a data cable and / or supply cable that extends through the fastening device opening 20).

[0074] The housing base 18 can be designed as a separate component and, depending on the connection concept between the sensor and the housing, can be designed as a collar covering the connection piece to the sensor or the sensor itself. Alternatively, the housing base 18 can also be predominantly planar and have corresponding openings for connecting a cable for electrically connecting the sensor to the measuring amplifier 17 and / or the electronics unit 10.

[0075] Figure 3 shows Figure 1 and Figure 2 An exploded view of the design of the internal part of the measuring transducer. Each of the electronics modules has a one-piece module holder 12i, and an electronics component 13i is arranged in each electronics module. The electronics components 13a, 13b, 13c, 13d are circuit boards. Measuring and / or operating circuits and / or voltage conversion or voltage regulation devices are arranged on the circuit boards. The module holders 12a, 12b, 12c, 12d each have a module holder body 14 that is in particular fully conductive, and the module holder body 14 is designed to shield the respective electronics component 13i held therein from unwanted electrical or electromagnetic effects. Thus, the module holder bodies 14 can each be at least partially metallic.

[0076] In the illustrated embodiment, four module holders 12a, 12b, 12c, 12d and four electronics components 13a, 13b, 13c, 13d are provided. However, the measuring sensor according to the invention is not limited to a specific number of module holders 12i and electronics components 13i. Thus, the electronics unit can exactly comprise one electronics module and thus also exactly one module holder with exactly one electronics component. Similarly, the electronics unit can comprise a plurality of electronics modules, but only one of the corresponding module holders can comprise an electronics component, or alternatively, all module holders except one can carry electronics components. The module holders 12i each have at least partially a circumferential collar 26, and the respective electronics component 13i is arranged in the region delimited by the collar 26. The height of the collar 26 defines the volume of the electronics component.

[0077] In addition, the module holders 12i each have, in particular, a fully conductive base that fills at least most of the region delimited by the collar. The electronic device assemblies 13i are always located on the base 27. Additionally, the module holders each have a lateral opening 30 in the collar 26 for at least one electrical plug connector 31 that is in electrical contact with the electronic device assembly 13i arranged in the corresponding module holder 12i, and a plug of a cable can be inserted into the electrical plug connector 31. In the illustrated embodiment, at least two electronic device modules have substantially the same profile when viewed in the direction of the longitudinal axis of the housing. Thus, the module holders 12i are stacked on top of one another on their particularly conductive axial edges 26.

[0078] Between the module holder 12d and the measuring amplifier 17, there is a partition wall 23 that is designed to shield the measuring amplifier 17 from electrical or electromagnetic effects generated by the electronic device assembly 13d and / or the higher-level electronic device assemblies 13a, 13b, 13c. The partition wall 23 is designed as an integral part of the module holder 12b. Alternatively, the partition wall 23 can also be designed as a separate component located between the module holder 12b and the measuring amplifier 17.

[0079] In this case, the electronic device module can be mechanically connected to the sensor via the fastening device 19. The fastening device 19 is in particular fully conductive and is in electrical contact with the electronic device unit, in particular with the first electronic device module and preferably with the module holder 12d or the module holders 12a, 12b, 12c, 12d. Additionally, the electrical connection between the sensor (in particular the conductive part of the sensor) and the module holder 12i (in particular the connector arranged on one of the module holders) is achieved only via the fastening device 19 and not via the housing body. The fastening device 19 has an interior in which the measuring amplifier 17 is arranged.

[0080] The fastening means 22, in particular a conductive fastening means represented by a screw, which electrically connects the electronic device modules to each other, is part of the illustrated embodiment. Instead of a screw, a pin, a cable, etc. can also be used.

[0081] One of the electronic device modules, in particular the module holder, can have a lateral electrical plug connector 31 into which an electrical plug of a cable can be inserted. Via this electrical plug connector 31, the stack can be electrically connected to the sensor and / or a display attached to the housing cover via a cable, for example.

[0082] When using multiple electronic device modules, it is advantageous for the mounting brackets to each have a guiding profile 28, which is designed to be inserted into a profile receiving portion 29 of an adjacent module holder. The guiding profile 28 can be designed as a protrusion on the collar 26, and the profile receiving portion 29 can be designed as a recess on the collar 26.

[0083] List of reference numerals

[0084] Measuring transducer 1

[0085] Field device 2 for metering and automation

[0086] Sensor 3

[0087] Housing 4

[0088] Housing body 5

[0089] Housing chamber 6

[0090] Housing wall 7

[0091] First housing opening 8

[0092] Cover 9

[0093] Electronic device unit 10

[0094] Electronic device module 11i

[0095] Module holder 12i

[0096] Electronic device assembly 13i

[0097] Module holder body 14

[0098] Connector 15i

[0099] Second housing opening 16

[0100] Measuring amplifier 17

[0101] Housing base 18

[0102] Fastening device 19

[0103] Fastening device opening 20

[0104] Module holder cover 21

[0105] Fastening element 22

[0106] Partition wall 23

[0107] Power electronics 24

[0108] Feedthrough 25

[0109] Collar 26

[0110] Base 27

[0111] Guide profile 28

Claims

1. A measuring transducer (1) for a field device (2) used in metrology and automation, the measuring transducer being adapted to process a measurement signal from a sensor (3) and to provide a measured value of at least one process variable, the measuring transducer comprising: - a housing (4) having a housing body (5), the housing body having at least one housing chamber (6) enclosed by a housing wall (7) within the housing interior of the housing body, - an electronic unit (10) having at least one electronic device module (11i), the at least one electronic device module in each case having a module holder (12i) and at least one electronic device component (13i) arranged in the module holder (12i), characterized in that the module holder (12i) has a module holder body (14), the module holder body being in particular fully conductive and being designed to shield the at least one electronic device component (13i) from undesired electrical or electromagnetic effects.

2. The measuring transducer (1) according to claim 1, wherein, the housing (5) has a first housing opening (8) which can be closed or can be closed by means of a cover (9), wherein the electronic unit (10) is designed such that the electronic unit can pass through the first housing opening (8), in particular in the direction of the housing longitudinal axis.

3. The measuring transducer (1) according to claim 1 or 2, wherein, the at least one electronic device module (11i) has a connector (15i), and the module holder body (14) can be electrically connected to a reference potential or is electrically connected to a reference potential via the connector.

4. The measuring transducer (1) according to claim 3, wherein, the housing body (5) has a second housing opening (16) through which at least the connector (15i) can be accessed, wherein the second housing opening (16) can also be closed or is closed by a cover (9).

5. The measuring transducer (1) according to claim 3 or 4, wherein, the at least one electronic device module (11i) on which the connector (15i) is arranged includes power electronics (24).

6. The measuring transducer (1) according to any one of the preceding claims, wherein, a measuring amplifier (17) is arranged in the housing chamber (6) between the at least one electronic device module (11i) and the housing base (18) of the housing (4).

7. The measuring transducer (1) according to claim 6, wherein, a partition wall (23) is provided between the module holder (12i) and the measuring amplifier (17), the partition wall being designed to shield the measuring amplifier (17) from electrical or electromagnetic effects generated by the at least one electronic device component (13i).

8. The measuring transducer (1) according to any one of the preceding claims, wherein, The fastening device (19) is arranged in the housing chamber (6), and the at least one electronic device module (11i) can be connected to the sensor (3) via the fastening device. Wherein, the fastening device (19) is in particular designed to be fully conductive and is in electrical contact with the electronic device unit (10), in particular with the first electronic device module (11i), and preferably with the module holder (12i).

9. The measuring transducer (1) according to claim 8, Wherein, The electrical connection between the sensor (3), in particular the conductive part of the sensor (3), and the connector (15i) is realized only via the fastening device (19).

10. The measuring transducer (1) according to any one of claims 6 to 9, Wherein, The fastening device (19) has an interior in which the measuring amplifier (17) is arranged.

11. The measuring transducer (1) according to any one of claims 8 to 10, Wherein, The fastening device (19) has a fastening device opening (20), and the measuring amplifier (17) can be electrically connected to the at least one electronic device module (11i) through the fastening device opening.

12. The measuring transducer (1) according to any one of the foregoing claims, Wherein, The electronic device unit (10) includes a module holder cover (21), and the module holder cover is designed to shield the at least one electronic device component (13i) from unwanted electrical or electromagnetic effects.

13. The measuring transducer (1) according to any one of the foregoing claims, Wherein, The module holder (12i) has a base that is in particular fully conductive, and the base fills at least most of the area defined by the collar.

14. The measuring transducer (1) according to any one of the foregoing claims, Wherein, The electronic device component (13i) includes a circuit board having a measuring and / or operating circuit and / or a circuit board for voltage conversion or regulation.

15. A field device (2) for metering and automation for monitoring and / or determining at least one process variable of a medium, Comprising: - A sensor (3) for detecting at least one measurement signal representing the process variable of the medium, - The measuring transducer (1) according to any one of the foregoing claims, the measuring transducer having measuring transducer electronics designed to process the measurement signal from the sensor (3) and provide a measured value of the at least one process variable, Wherein, The sensor (3) is electrically connected to and in particular mechanically connected to the measuring transducer (1).

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