Measurement transducer and field device

Abstract

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

Description

[0001] Transmitter and field device

[0002] The invention relates to a measuring transducer for a field device of measurement and automation technology for processing a measurement signal of a sensor and providing measured values ​​of at least one process variable and further to a field device of measurement and automation technology for monitoring and / or determining at least one process variable of a medium.

[0003] In automation technology, particularly in process automation technology, field devices are often used to record and / or influence process variables. Sensors integrated into, for example, level measuring devices, flow meters, pressure and temperature measuring devices, pH-redox potential measuring devices, conductivity measuring devices, etc., are used to record process variables. These sensors record the corresponding process variables: level, flow, pressure, temperature, pH value, or conductivity. Actuators such as valves or pumps are used to influence process variables; they can be used to change the flow of a liquid in a pipe section or the fill level in a container. Field devices are essentially all devices that are used close to the process and that provide or process-relevant information.In the context of the invention, field devices also include remote I / Os, radio adapters or generally electronic measuring components that are arranged at the field level.

[0004] A field device is in particular selected from a group consisting of flow measuring devices, level measuring devices, pressure measuring devices, temperature measuring devices, point level measuring devices and / or analytical measuring devices.

[0005] Flow meters include, in particular, Coriolis, ultrasonic, vortex, thermal and / or magnetic-inductive flow meters.

[0006] Level measuring devices include, in particular, radar-based level measuring devices, microwave level measuring devices, ultrasonic level measuring devices, time-domain reflectometric level measuring devices, radiometric level measuring devices, capacitive level measuring devices, inductive level measuring devices and / or temperature-sensitive level measuring devices.

[0007] Pressure measuring instruments are in particular absolute, relative or differential pressure devices.

[0008] Temperature measuring devices are in particular measuring devices with thermocouples and / or temperature-dependent resistors.

[0009] Point level measuring devices include, in particular, vibronic point level measuring devices, ultrasonic point level measuring devices, and / or capacitive point level measuring devices. Analytical measuring devices include, in particular, pH sensors, conductivity sensors, oxygen and active oxygen sensors, (spectro)photometric sensors, and / or ion-selective electrodes.

[0010] The electronics unit, which processes the sensor's measurement signals and provides measured values ​​of the monitored process variable, is typically located in the transmitter. For example, DE 20 2014 101 560 U1 discloses an electronics unit for a fluid sensor located in a transmitter housing. The electronics unit comprises modular, plastic spacers, each of which houses an electronic component.

[0011] To shield the electronics unit from unwanted electrical or electromagnetic effects, the transmitter housing is typically made of metal. For housings made of electrically non-conductive materials, alternative grounding and EMC concepts are necessary. Shielding plates can be provided inside the housing, designed to shield the electronics unit. It is obvious that metal housings of existing products cannot be easily replaced with plastic ones.

[0012] The invention is based on the object of remedying the problem.

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

[0014] The measuring transducer according to the invention for a field device of measurement and automation technology for processing a measurement signal of a sensor and providing measured values ​​of at least one process variable, comprising:

[0015] - a housing with a housing body which has at least one housing chamber in its interior which is enclosed by a housing wall,

[0016] - an electronic unit with at least one electronic module, which has a module holder and an electronic component arranged in the module holder, characterized in that the module holder has a module holder body which is designed to be, in particular completely, electrically conductive and in that the electronic module, in particular the module holder, is designed to shield the at least one electronic component from undesired electrical or electromagnetic effects.

[0017] The advantage of this solution is that the electronics unit is shielded not by the housing, but by the electronics unit itself. For this purpose, the electronics unit has at least one module holder, which is designed such that the electronic components arranged in the module holder neither interfere with other devices through unwanted electrical or electromagnetic effects nor are they interfered with by other devices. The electronics unit is thus inherently electromagnetically compatible (EMC). It is particularly advantageous if the electronics unit, in particular the at least one module holder, complies with the applicable EMC standards.The European EMC Directive defines electromagnetic compatibility as "the ability of an apparatus, installation, or system to operate satisfactorily in its electromagnetic environment without causing electromagnetic disturbances that would be unacceptable to all apparatus, installations, or systems in that environment." By providing an electrically conductive module mount, the housing's shielding properties can be dispensed with.

[0018] Furthermore, the provision of electrically conductive module holders, which are made of metal for example, results in improved heat dissipation of the heat generated by the electronic components to the interior of the housing.

[0019] Advantageous embodiments of the invention are the subject of the subclaims.

[0020] One embodiment provides that the housing body has a first housing opening which can be closed or is closed by means of a cover, wherein the electronic unit is designed such that it can be passed through the first housing opening, in particular in the direction of the housing longitudinal axis.

[0021] One embodiment provides that the at least one electronic module has a connection via which the module holder body can be electrically connected to a reference potential or is electrically connected to a reference potential.

[0022] The reference potential can be a ground potential. The connector is preferably located directly on the module mount, allowing shielded cables to be connected to the connector close to the source of interference. This ensures that interference generated by the electronic components can be dissipated immediately after it is generated through the shield connection.

[0023] In electromagnetic compatibility (EMC), two aspects are crucial: interference from the electronics should not be transmitted to the outside and interfere with other devices, and external interference should not negatively affect the functionality of the device itself. Shielded cables, in particular, help make communication more robust (i.e., less susceptible to interference). One design provides for the housing body to have a second opening through which at least the connection is accessible. This second opening can also be closed or sealed with a cover.

[0024] An advantage of this design is the easier access to the connector, allowing for the use of multiple electronic modules. Furthermore, in addition to the reference potential connector, additional connectors (power supply / IO / modem) can be provided, which are preferably also accessible via the second housing opening.

[0025] One embodiment provides that the at least one electronic module on which the connection is arranged comprises a power supply electronics.

[0026] Often, disturbances in the power supply are intercepted and diverted directly via the power supply. It is therefore advantageous to locate the connection directly on the module holder, in which the power supply electronics are also mounted.

[0027] Typical components of a power supply's electronics include fuses to protect against current overloads, diodes to protect against 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 connection point in the device to ensure that all other components connected downstream are safe and protected from external interference.

[0028] One embodiment provides that the housing has only exactly one housing opening for inserting the electronic unit and connecting reference potentials, in particular to the terminal.

[0029] In the case of small enclosures, everything is assembled and connected through a single opening. The advantage of this design is the consistent assembly direction during production. Furthermore, customer service remains in the usual orientation. In the case of large enclosures, assembly takes place through the first opening and connection is made through the second opening.

[0030] Another advantage is the space savings compared to multiple enclosure openings. Each additional enclosure opening requires space and expands the enclosure dimensions.

[0031] One embodiment provides for a measuring amplifier to be arranged in the housing chamber between the at least one electronic module and a housing base. The housing base separates the housing at least from the sensor mounted in the immediate vicinity. A cable also runs through the housing base, via which the sensor's measurement signal is transmitted to the measuring amplifier. It is advantageous if the distance between the measuring amplifier and the sensor is as small as possible.

[0032] One embodiment provides that a partition wall is provided between the module holder and the measuring amplifier, which partition wall is designed to shield the measuring amplifier from electrical or electromagnetic effects generated by the at least one electronic component.

[0033] The measurement signal transmitted from the sensor to the measuring amplifier is sensitive to interference and must therefore be shielded. To prevent interference generated by the electronic components from distorting the measurement signals, it is advantageous to provide a partition wall with shielding properties between the electronic component and the measuring amplifier. The partition wall can be perforated and / or ribbed. This serves to improve heat dissipation through convection and / or to facilitate cable routing. Furthermore, the partition wall can be designed as a separate component or as an integral part of the module mount.

[0034] One embodiment provides that a fastening device is arranged in the housing chamber, via which the at least one electronic module can be connected to the sensor, wherein the fastening device is designed, in particular completely, to be electrically conductive and is in electrical contact with the electronic unit, in particular with the first electronic module and preferably with the module holder.

[0035] This ensures a direct electrical connection and the best possible electrical connection between the sensor and the electronic module.

[0036] One embodiment provides that an electrical connection between the sensor, in particular an electrically conductive portion of the sensor, and the connection is made exclusively via the fastening device.

[0037] The electrical connection between the sensor and the electronics unit or electronics module is thus independent of the housing material and its electrical properties. The electrical structure of the electronics unit remains identical with or without the conductive housing material.

[0038] One embodiment provides for the fastening device to have an interior in which the measuring amplifier is arranged. To achieve sufficient shielding of the measuring amplifier, it is advantageous if it is circumferentially surrounded by a metallic body. It is particularly advantageous if the fastening device provided for the mechanical connection of the sensor to the electronics unit is also designed and constructed to shield the measuring amplifier from unwanted electrical and electromagnetic effects. This results in a more compact design.

[0039] One embodiment provides that the fastening device has a fastening device opening through which the measuring amplifier can be electrically connected to the at least one electronic module.

[0040] One embodiment provides that the electronic unit comprises a module holder cover, in particular an electrically conductive one, which is designed to shield the at least one electronic component from undesired electrical or electromagnetic effects.

[0041] The module mounting cover shields the EMC interference generated by the concealing electronic component and the concealing electronic component from external EMC interference. The module mounting cover can be designed as a separate component or as an integral part of the module mounting.

[0042] One embodiment provides that at least one electronic component is arranged on the module holder cover, which is insensitive to unwanted electrical or electromagnetic effects.

[0043] One embodiment provides that the module holder at least partially has a circumferential collar which supports the electronic component in the area delimited by the collar.

[0044] The collar encloses the electronic component at least in sections. This serves to shield the electronic component from EMC interference. Furthermore, the collar is designed and configured to absorb the heat of the electronic component and dissipate it into the environment inside the housing. Heat dissipation occurs automatically through the surface of the holder, which is inherently larger than the surface of the electronic component, and can also be accelerated by large-area, thermally highly conductive connections to other module holders and ultimately to the housing or preferably to the sensor, which is at least partially made of metal. One embodiment provides for the module holder to have an electrically conductive base, in particular a completely electrically conductive base, which fills at least a large part of the area defined by the collar.

[0045] The base can be perforated and / or ribbed. This serves to improve heat dissipation and / or facilitate cable routing. Furthermore, the base can be designed as a separate component or as an integral part of the module holder. In an advantageous embodiment, the base corresponds to the partition wall of the module holder.

[0046] One embodiment provides that the electronic component comprises a printed circuit board with a measuring and / or operating circuit and / or a printed circuit board for voltage conversion or conditioning.

[0047] One embodiment provides that the module holder has a lateral opening for an electrical plug connection, which is in electrical contact with the electronic component arranged in the corresponding module holder and to which a plug with cable can be plugged.

[0048] One embodiment provides that the electronic unit comprises at least two electronic modules, wherein the at least two electronic modules are stacked on top of one another.

[0049] Due to its design, the electronics unit is a type of modular system. By using more than one electronic module, customer-specific configurations can be realized with regard to the electronic components and requirements for the measuring transducer. The respective electronic components are usually different, i.e. they perform different functions. For example, one electronic module can contain an operating, measuring and / or evaluation circuit, while another electronic module can contain a voltage converter. Thanks to its modularity, the electronics unit can also be easily expanded. This is particularly advantageous if the customer wishes to provide additional signal outputs (e.g. fieldbuses) in the measuring transducer.

[0050] One embodiment provides that the module holders of the at least two electronic modules have essentially the same outline when viewed in the direction of a longitudinal axis of the housing.

[0051] One embodiment provides that the at least two electronic modules are connected to one another via a fastening element, in particular one that is electrically conductive. One embodiment provides that the module holders each rest on one another at their axial edges, which are in particular electrically conductive.

[0052] A field device according to the invention for measuring and automation technology for monitoring and / or determining at least one process variable of a medium comprises:

[0053] - a sensor for detecting at least one measurement signal representing the process variable of the medium,

[0054] - a measuring transducer according to one of the preceding claims with measuring transducer electronics which are designed to process the measuring signal from the sensor and to provide measured values ​​of the at least one process variable, wherein the sensor is mechanically and electrically connected to the measuring transducer.

[0055] The invention is explained in more detail with reference to the following figures. They show:

[0056] Fig. 1 : two views of an embodiment of the field device;

[0057] Fig. 2: a design of the internal part of the measuring transducer, in particular the electronic unit; and

[0058] Fig. 3: an exploded view of the electronics unit design.

[0059] Fig. 1 shows a view of an embodiment of the field device 2 according to the invention for measuring and automation technology for monitoring and / or determining at least one process variable of a medium, comprising a sensor 3 and a measuring transducer 1, both of which are mechanically and electrically connected to one another. Alternatively, the measuring transducer 1 can also be connected only electrically to the sensor 3 and not mechanically. The sensor 3 is configured to detect at least one measurement signal representing the process variable of the medium. The sensor 3 can, for example, be the measuring sensor of a Coriolis flowmeter, a magnetic-inductive flowmeter, a magnetic-inductive flowmeter probe, a thermal flowmeter, a vortex flowmeter, or an ultrasonic flowmeter. The measuring transducer 1 has a housing 4 with two housing openings 8, 16 closed by covers 9.The housing 4 has a preferably electrically insulated housing body 5, in the interior of which at least one housing chamber 6 is located. The housing 4 can thus be formed from an electrically insulating plastic. The housing body 5 can be formed in one piece or in multiple parts. In the embodiment shown, the housing interior has exactly one housing chamber 6. The housing chamber 6 is delimited by the housing wall 7. The housing 4 is mechanically connected to the sensor 3. Furthermore, the housing 4 has four feedthroughs 25 for a cable for supplying the electronics unit with a supply voltage, a ground cable and / or a cable for conducting the measured values ​​to a higher-level process monitoring device.

[0060] The second view provides a view into the housing chamber 6 through the two housing openings 8, 16. The first housing opening 8 and the second housing opening 16 can each be closed by a cover 9. The electronics unit 10 is designed such that it can be passed through the first housing opening 8, in particular in the direction of the longitudinal axis of the housing. This means that the electronics unit 10 can be inserted and removed through the first housing opening 8. Arranged in the housing chamber is a measuring transducer electronics system which is designed to process the measurement signal from the sensor 3 and to provide measured values ​​of the at least one process variable. The measuring transducer electronics is formed at least partially by the electronic components (see Fig. 3), which are part of an electronics unit 10. The electronics unit 10 is accessible via the second housing opening 16.The installer can then pass a cable through one of the bushings via the second housing opening 16 and connect it to the electronics unit 10.

[0061] A more detailed view of the electronics unit 10 is shown in Fig. 2. The electronics unit 10 comprises at least one electronics module 11a. In the embodiment shown, more electronics modules than just the at least one electronics module 11a are shown. In total, the embodiment shown has four electronics modules 11a, 11b, 11c, 11d designed as separate components, which are stacked directly on top of one another. However, modular spacers in which no electronic component is arranged can also be provided between the individual electronics modules 11i. These serve as placeholders. The electronics modules 11i are designed such that they shield the electronic components arranged therein from unwanted electrical or electromagnetic effects and also shield the unwanted electrical or electromagnetic effects generated by the electronic components.The electronic module 11c has at least one terminal 15i, via which it can be electrically connected to a reference potential. In the illustrated embodiment, the electronic module 11c has exactly two terminals 15a, 15b. In the illustrated embodiment, the electronic component arranged in the electronic module 11c is a power supply electronics 24.

[0062] A module holder cover 21, particularly one designed to be electrically conductive, is arranged on the electronic module 11a and is designed to shield at least one of the concealed electronic components 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 module 11a. At least one electronic component that is insensitive to unwanted electrical or electromagnetic effects is arranged on the module holder cover 21. For example, a connection for a display or service port or a connector for overwriting or updating the stored software can be arranged on the module holder cover 21.

[0063] The electronics unit 10 is connected to the sensor 3 via a fastening device 19. A measuring amplifier 17 is arranged below the electronics unit 10, i.e. between the electronics unit 10 and the sensor 3 or the housing base 18. This measuring amplifier 17 is designed to receive the measurement signal from the sensor 3, amplify it, and transmit it to a measuring and / or evaluation circuit. The fastening device 19 is additionally designed to shield the measuring amplifier 17 from unwanted electrical or electromagnetic effects. The electrical connection between the measuring amplifier 17 and the electronics unit 10 is established via a cable, in particular a data cable and / or supply cable, which extends through a fastening device opening 20.

[0064] 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 that encompasses a connecting piece to the sensor or the sensor itself. Alternatively, the housing base 18 can also be predominantly planar with corresponding openings for connecting cables for electrically connecting the sensor to the measuring amplifier 17 and / or the electronics unit 10.

[0065] Fig. 3 shows an exploded view of the design of the internal part of the measuring transducer from Figs. 1 and 2. The electronic modules each have a one-piece module holder 12i, in which an electronic component 13i is arranged. The electronic components 13a, 13b, 13c, 13d are printed circuit boards. The measuring and / or operating circuit and / or the voltage conversion or voltage conditioning are arranged on the printed circuit boards. The module holders 12a, 12b, 12c, 12d each have, in particular completely, electrically conductive module holder bodies 14, which are designed to shield the respectively held electronic component 13i from unwanted electrical or electromagnetic effects. Thus, the module holder bodies 14 can each be at least partially metallic.

[0066] In the illustrated embodiment, four module holders 12a, 12b, 12c, 12d and four electronic 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 electronic components 13i. Thus, the electronics unit can comprise exactly one electronic module and thus also exactly one module holder with exactly one electronic component. Likewise, the electronics unit can comprise multiple electronic modules, although only one of the corresponding module holders comprises an electronic component or, alternatively, all but one of the module holders carries an electronic component. The module holders 12i each have, at least in part, a circumferential collar 26, and the respective electronic component 13i is arranged in the area delimited by the collar 26. The height of the collar 26 defines the volume for the electronic components.

[0067] Furthermore, the module holders 12i each have a, in particular completely, electrically conductive base, which fills at least a large part of the area delimited by the collar. An electronic component 13i is always seated on the base 27. In addition, the module holders each have a lateral opening 30 in the collar 26 for at least one electrical plug connection 31, which is in electrical contact with the electronic component 13i arranged in the corresponding module holder 12i and to which a plug with a cable can be plugged. In the embodiment shown, at least two electronic modules have essentially the same outline when viewed in the direction of a longitudinal axis of the housing. As a result, the module holders 12i each sit on top of one another at their, in particular electrically conductive, axial edges 26.

[0068] Between the module holder 12d and the measuring amplifier 17 is a partition 23 designed to shield the measuring amplifier 17 from electrical or electromagnetic effects generated by the electronic component 13d and / or the higher-level electronic components 13a, 13b, 13c. The partition 23 is designed as an integral component of the module holder 12b. Alternatively, the partition 23 can also be designed as a separate component positioned between the module holder 12b and the measuring amplifier 17.

[0069] The electronics unit, in this case the electronic modules, can be mechanically connected to the sensor via the fastening device 19. The fastening device 19 is, in particular completely, electrically conductive and is in electrical contact with the electronics unit, in particular with the first electronic module and preferably with the module holder 12d or the module holders 12a, 12b, 12c, 12d. Furthermore, the electrical connection between the sensor, in particular an electrically conductive portion of the sensor, and the module holders 12i, in particular the connection arranged on one of the module holders, is made exclusively 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.Part of the illustrated embodiment are fastening means 22, in particular electrically conductive, represented by screws, which electrically connect the electronic modules to one another. Instead of screws, pins, cables, etc. can also be provided. One of the electronic modules, in particular of the module holders, can have a lateral electrical plug connection 31 to which an electrical plug with cable can be plugged. Via this electrical plug connection 31, for example, the stack can be electrically connected to the sensor and / or to the display attached to the housing cover via a cable. When using multiple electronic modules, it is advantageous if the mounting holders each have a guide profile 28 which is designed to be inserted into a profile receptacle 29 of the adjacent module holder.The guide profile 28 can be designed as a projection on the collar 26 and the profile receptacle 29 as a recess on the collar 26.

[0070] LIST OF REFERENCE SYMBOLS

[0071] Transmitter 1

[0072] Field device for measurement and automation technology 2

[0073] Sensor 3

[0074] Housing 4

[0075] Housing body 5

[0076] Housing chamber 6

[0077] Housing wall 7 first housing opening 8

[0078] Lid 9

[0079] Electronics unit 10

[0080] Electronic module 11i

[0081] Module holder 12i

[0082] Electronic component 13i

[0083] Module holder body 14

[0084] Connection 15i second housing opening 16

[0085] Measuring amplifier 17

[0086] Case back 18

[0087] Fastening device 19

[0088] Fastening device opening 20

[0089] Module holder cover 21

[0090] Fastening element 22

[0091] Partition 23

[0092] Power supply electronics 24

[0093] Implementations 25

[0094] Collar 26

[0095] Floor 27

[0096] Leadership Profile 28

Claims

PATENT CLAIMS 1 . A measuring transducer (1) for a field device of measurement and automation technology (2) for processing a measurement signal of a sensor (3) and providing measured values ​​of at least one process variable, comprising: - a housing (4) with a housing body (5) which has at least one housing chamber (6) in its interior, which is enclosed by a housing wall (7), - an electronics unit (10) with at least one electronic module (11 i), each of which has a module holder (12i) and at least one electronic component (13i) arranged in the module holder (12i), characterized in that the module holder (12i) has a module holder body (14) which is designed, in particular completely, to be electrically conductive and is designed to shield the at least one electronic component (13i) from undesired electrical or electromagnetic effects.

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

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

4. Measuring transducer (1) according to claim 3, wherein the housing body (5) has a second housing opening (16) through which at least the connection (15i) is accessible, wherein the second housing opening (16) is also closable or closed by a cover (9).

5. Measuring transducer (1) according to claim 3 or 4, wherein the at least one electronic module (11 i) on which the connection (15 i) is arranged comprises a power supply electronics (24).

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

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

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

9. Measuring transducer (1) according to claim 8, wherein an electrical connection between the sensor (3), in particular an electrically conductive portion of the sensor (3) and the connection (15i) is made exclusively via the fastening device (19).

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

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

12. Measuring transducer (1) according to one of the preceding claims, wherein the electronics unit (10) comprises a module holder cover (21) which is designed to shield the at least one electronic component (13i) from undesired electrical or electromagnetic effects.

13. Measuring transducer (1) according to one of the preceding claims, wherein the module holder (12i) has a, in particular completely, electrically conductive base which fills at least a large part of the area delimited by the collar.

14. Measuring transducer (1) according to one of the preceding claims, wherein the electronic component (13i) comprises a printed circuit board with a measuring and / or operating circuit and / or a printed circuit board for voltage conversion or conditioning.

15. Field device of measurement and automation technology (2) 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, - a measuring transducer (1) according to one of the preceding claims with a Measuring transducer electronics which are designed to process the measuring signal from the sensor (3) and to provide measured values ​​of the at least one process variable, wherein the sensor (3) is electrically and in particular mechanically connected to the measuring transducer (1).

Images