Automated field device

Abstract

The invention relates to an automated field device (1), comprising: - a measuring tube (8) for conducting a flowable medium, the measuring tube (8) having an outer lateral surface (58), - a measuring assembly (3) for determining a physical and / or chemical measured variable of the medium, the measuring assembly (3) being arranged at least partially on the measuring tube (8), - a housing (5) for accommodating at least one electronic component (4), wherein the housing (5) is arranged on the outer lateral surface (58) and at least partially covers the measuring assembly (3), and the housing (5) has a housing wall (47) which, together with the outer lateral surface (58), delimits a housing interior (48), and - a molded body (13) for securing the at least one electronic component (4) and / or the measuring assembly (3). The molded body (13) is arranged in the housing interior (48), and the molded body (13) has an outer molded body lateral surface (25). The outer molded body lateral surface (25), the housing wall (47) and, in particular, the outer lateral surface (58) delimit a sealing seat (59), and a sealant (60), in particular applied in liquid form, is arranged in the sealing seat (59).

Description

Technical Field

[0001] This invention relates to an automated field device, and more particularly to a magnetic induction flow meter. Background Technology

[0002] In automation, particularly process automation, field devices are frequently used to capture and / or modify process variables. To detect process variables, sensors integrated into devices such as fill level measuring devices, flow meters, pressure and temperature measuring devices, pH redox potentiometers, conductivity meters, etc., are used to detect the corresponding process variables, such as fill level, flow rate, pressure, temperature, pH level, or conductivity. Actuators, such as valves or pumps, are used to influence process variables. Thus, the flow rate of fluid in a pipe section or the fill level in a container can be changed by actuators. In principle, all devices oriented towards a process and providing or processing process-related information are referred to as field devices. Therefore, in conjunction with this invention, "field device" also refers to remote I / O, radio adapters, or, generally speaking, electronic measuring components located at the field level.

[0003] The field equipment is specifically selected from a group consisting of flow meters, fill level measuring devices, pressure measuring devices, temperature measuring devices, limit level measuring devices and / or analytical measuring devices.

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

[0005] Fill level measuring equipment, especially microwave fill level measuring equipment, ultrasonic fill level measuring equipment, time domain reflectance measuring equipment, radiation fill level measuring equipment, capacitive fill level measuring equipment, inductive fill level measuring equipment and / or temperature-sensitive fill level measuring equipment.

[0006] Pressure measuring equipment, especially absolute pressure measuring equipment, relative pressure measuring equipment, or differential pressure measuring equipment.

[0007] Temperature measuring equipment, especially measuring equipment with thermocouples and / or temperature-dependent resistors.

[0008] Limit level measuring equipment, especially vibratory electronic limit level measuring equipment, ultrasonic limit level measuring equipment and / or capacitive limit level measuring equipment.

[0009] Analytical measurement equipment, particularly pH sensors, conductivity sensors, oxygen and reactive oxygen species sensors, (spectro)photometric sensors and / or ion-selective electrodes.

[0010] Known and widely used assembly concepts for electronic components employ numerous C-parts, such as screws, nuts, and retaining clips, to ensure the electronic components are adequately secured within the housing. However, such assembly concepts are complex and expensive.

[0011] Furthermore, to reduce production costs, wider dimensional and shape tolerances can be accepted for individual components. As a result, undesirable mechanical stresses are generated in the individual components during assembly, leading to malfunctions or defects, or compromising the sealing between the components.

[0012] Sealed connections are standard in automated field equipment to prevent moisture or impurities from entering the housing. These sealed connections are designed according to operational requirements and typically must be compressed by at least 10% of their initial dimensions. However, the preload applied for this purpose is often too high, especially for cold-formed parts, such as the molded halves of deep-drawn housings. They cannot withstand such preload and undesirable deformation occurs, thus failing to ensure a localized seal. Summary of the Invention

[0013] The purpose of this invention is to solve the above-mentioned problems.

[0014] This objective is achieved by using the following automated field devices.

[0015] The automated field device according to the present invention includes: - Measuring tube, which is used to guide the flowable medium. The measuring tube has an external lateral surface. - Measurement setup, used to determine the physical and / or chemical measurement variables of the medium. The measuring arrangement is at least partially arranged on the measuring tube. - A housing for housing at least one electronic component for operating the measurement arrangement, controlling control variables of the measurement arrangement, determining measured values ​​of the measurement variables, and / or evaluating the measurement variables. The housing is disposed on the outer lateral surface and at least partially covers the measuring arrangement. The housing has a housing wall, which, together with the outer lateral surface, defines the interior of the housing. - A molded portion for securing the at least one electronic component and / or the measuring arrangement. The molded portion is located inside the housing. The molded portion has an outer molded portion lateral surface. The outer molded portion's lateral surfaces and housing walls, particularly the outer lateral surfaces, define the sealing seat. The sealing device, which is specifically applied in liquid form, is arranged in the sealing seat.

[0016] One embodiment specifies that the molded portion has a recess that, together with the external lateral surface and the housing wall, particularly the flange inserted into the housing wall, forms a sealing seat for reinforcing the housing wall.

[0017] One embodiment specifies that the molded portion has a recess that specifically forms a sealing seat together with the housing wall.

[0018] One embodiment specifies that the housing wall has a first edge portion that is at least partially in direct contact with an external lateral surface. The first edge portion bends at least partially away from the interior of the shell. At least the first edge portion is frictionally locked with the measuring tube. The first edge portion includes the sealing seat.

[0019] One embodiment specifies that the first edge portion is not curved. The first edge portion has, at least in the longitudinal section passing through the field equipment, a first edge segment longitudinal axis intersecting the external lateral surface at an angle α. α has an angular dimension between 1° and 10°, particularly 5°.

[0020] One embodiment specifies that the housing includes a first housing molded portion half and a second housing molded portion half. The first and second molded housing halves are at least interlocked and / or frictionally, and preferably interlocked, frictionally, and integrally connected to each other. The first and second housing molded portions each have a second edge portion, which are in contact with each other.

[0021] One embodiment specifies that the mutually contacting second edge portions define the sealing seat at least in the radial direction of the measuring tube.

[0022] One embodiment specifies that the contacting edge portions further define the sealing seat in the direction of the measuring tube.

[0023] One embodiment specifies that, at least in the cross-section passing through the field equipment, each of the second edge segments has a second edge segment longitudinal axis intersecting the central plane at an angle β. Among them, the angle β has an angular dimension of 1° to 10°, especially 5°. The central plane is spanned by the longitudinal axis of the measuring tube and a transverse axis extending perpendicular to the longitudinal axis. The central plane passes through at least one contact point of the second edge portion.

[0024] One embodiment specifies that the sealing seat is at least partially wedge-shaped.

[0025] One embodiment specifies that the sealing device includes at least a portion of a substance from the following list: Polyurethane Polysiloxane, Polyethylene, Epoxy resin.

[0026] One embodiment specifies that the molded portion is at least partially formed of granular foam, particularly comprising at least one substance from the following list: Polystyrene Polyphenylene sulfide, Foamed polypropylene, Polyurethane.

[0027] One embodiment specifies that the first edge portion and the outer lateral surface and / or the two aforementioned second edge portions together segmentally define a collection volume for receiving a sealing device that has shifted in the longitudinal direction. The collection volume is at least partially filled with a sealing device. Attached Figure Description

[0028] The invention will be explained in more detail with reference to the following figures. In the figures: Figure 1 A perspective view of an automated field device according to the present invention is shown.

[0029] Figure 2 A cross-section of the first molded portion half on which electronic components are arranged is shown; Figure 3 The longitudinal section of the magnetic induction flow meter is shown; Figure 4 A longitudinal section of a radar-based fill level measuring device is shown; Figure 5 A bottom view of the first molded half is shown; Figure 6 A perspective view of the centering device is shown; Figure 7A A perspective view of a partially cut-out shell with a first molded half is shown; Figure 7B Details of a cross-section through the shell are shown, in which the first molded half has been arranged and secured; Figure 8 Details of the edge region of the first housing molded portion half that contacts the measuring tube are shown; Figure 9 Details of the edge region of the first housing molded portion half that contacts the measuring tube are shown; Figure 10 Details of the edge region of the first housing molded portion half that contacts the second housing molded portion half are shown; and Figure 11 A perspective view showing a cross-section of the sealing seat between the first and second molded housing halves is shown. Detailed Implementation

[0030] Figure 1 A perspective view of an automated field device 1 according to the invention is shown. The automated field device 1 includes a measuring tube 8 for carrying a free-flowing medium and a measuring arrangement covered by a molded portion 13, the measuring arrangement being used to determine physical and / or chemical measurement variables of the medium, the measuring arrangement being disposed on the measuring tube 8. The measuring arrangement may be, for example, a thermal sensor comprising two temperature probes or two measuring electrodes, particularly in contact with the medium, for use in conjunction with a magnetic field generating device to sense a measurement voltage induced in the free-flowing medium. Various other measuring arrangements are known, all of which are suitable for the automated field device 1 according to the invention. An example of a measuring arrangement is the measuring arrangement of the measuring device mentioned in the background art. Furthermore, the automated field device 1 includes a housing disposed on the measuring tube 8 for housing at least one electronic component 4 for operating the measuring arrangement, controlling control variables of the measuring arrangement, determining measured values ​​of the measurement variables, and / or evaluating the measurement variables of the measuring arrangement. Figure 1 The housing is not shown so that two molded portions 13 arranged on the measuring tube 8 are visible. These molded portions are arranged within the housing when fully assembled and are wholly or at least partially covered by the housing or its walls. The molded portions 13 are used to fasten or retain the electronic component 4 and have thermoplastic and / or elastomer material in at least the first section 21. The first section 21 is located on the lateral surface of the outer molded portion. In a more advantageous embodiment, the thermoplastic comprises foamed polypropylene, wherein the density ρ of the foamed polypropylene is 30 ≤ ρ ≤90g / l, preferably 45≤ ρ ≤80 g / l. Foamed polypropylene having the density according to the invention reduces electrostatic charging of the molded portion 13 during assembly into the housing or onto the measuring tube. The molded portion 13 is formed from an integral first molded portion half 41 and a second molded portion half 42, in which case the first molded portion half 41 and the second molded portion half 42 are identical and also integral. Thus, the first molded portion half 41 is connected to the second molded portion half 42 at least in a form-fit manner. The first molded portion half 41 and the second molded portion half 42 together enclose the measuring tube 8 at least in the cross-section of the measuring tube.

[0031] The first segment 21 is elastically formed and has a socket 19 for receiving the electronic component 4. The socket 19 has at least one undercut 20. The socket 19 may be formed as a through hole or as a recess or blind hole. The undercut 20 may take the shape of a locking lug 30 or more locking lugs and / or be formed as a guide rail 36 into which the electronic component 4 can be inserted or is inserted into the guide rail 36. The guide rail 36 is formed as an elongated slot in the molded portion 13 or as a rod protruding from the base of the molded portion 13. The electronic component 4 is arranged in the socket 19 in an interlocking and / or frictionally engaged manner, such that when the molded portion 13 is assembled onto the measuring tube 8 and / or the housing, the electronic component 4 can be secured and will not fall out. Additional C-parts for fastening may be provided, but are not required. The electronic component 4 is held by a first section 21 or an undercut 20, which takes the form of four locking lugs 30 and guide rails 36 integrated into the molded portion. Furthermore, the molded portion 13 has, at least in the first section 21, the following compression set. DVR According to ISO 1798, where 0 ≤ DVR ≤20%, especially 5≤ DVR ≤15% and preferred DVR <15%. Because the molded portion 13 is at least partially deformed during assembly in the first section 21 to arrange and secure the electronic component 4 in the socket 19, the compressive permanent deformation of the molded portion 13 is critical. DVR No more than 20%. To keep the mechanical stress on electronic component 4 as low as possible, if... DVR A value greater than or equal to 5% is also advantageous. Additionally, the molded portion 13, at least in the first section 21, has an elongation at break of 10% to 20%, and preferably 14% to 16%, according to ISO 1798. Alternatively, the necessary mechanical properties of the molded portion 13 can also be described in terms of tensile strength. The molded portion 13, at least in the first section 21, has a tensile strength of 400 to 1300 kPa, particularly 600 to 1000 kPa, and preferably 700 to 880 kPa, according to ISO 1798.

[0032] Electronic component 4 includes a circuit board 28 on which electronic components 37 are arranged for operating the measurement arrangement, controlling the control variables of the measurement arrangement, and / or evaluating the measurement variables of the measurement arrangement. Electronic components 37 include, for example, processors, electromechanical components such as switches or relays, and passive components such as resistors, capacitors, and / or inductors, and / or active components such as diodes, transistors, and / or integrated circuits. Additionally, a display 2 is arranged on the first circuit board section for displaying measured values ​​of the measurement variables, process characteristics, and / or field device-specific system information. Electronic component 4 may further include connecting cables through which coils are connected to the operating circuitry. These connecting cables may extend in recesses specifically provided for this purpose and may be secured within these recesses.

[0033] Figure 2 It shows crossing Figure 1 The cross-section of the first molded portion half 41 of the molded portion is shown, on which electronic components 4 are arranged. The electronic components 4 include a circuit board having electronic components for operating the measurement arrangement, controlling control variables of the measurement arrangement, and / or evaluating measurement variables of the measurement arrangement. The circuit board has a rigid first circuit board segment 31 and a rigid second circuit board segment 32 separated from each other. Additionally, the circuit board has a flexible third circuit board segment 33, through which the separation of the first circuit board segment 31 and the second circuit board segment 32 is achieved. Housing ( Figure 2 (Not shown) has an inner housing lateral surface that, after assembly, mechanically contacts the shown first molded portion half 41 at least in some places or via at least one elastically formed second segment 22. The second segment 22 has at least one protrusion, which, in the illustrated embodiment, is implemented as a plurality of protruding ribs. This protrusion is designed such that it is compressed or displaced when the first molded portion half 41 is assembled into the first housing molded portion half. This is intended to compensate for manufacturing tolerances of the first molded portion half 41, the first housing molded portion half 51, and / or the measuring tube. Similar to the first segment 21, the second segment 22 also comprises thermoplastic in the form of foamed polypropylene. The first molded portion half 41 has the following compression set in the second segment 22. DVR According to ISO 1798, this compression set... DVR 0≤ DVR ≤20%, especially 5≤ DVR ≤15% and preferred DVR<15%. Furthermore, the first molded portion 41 has the following elongation at break in the second section 22, wherein, according to ISO 1798, this elongation at break is 10% to 20%, and preferably 14% to 16%. Another characteristic mechanical variable of the first molded portion 41 is tensile strength. In the second section 22, according to ISO 1798, the tensile strength is 400 to 1300 kPa, particularly 600 to 1000 kPa, and preferably 700 to 880 kPa.

[0034] Furthermore, the first molded portion half 41 has a protrusion 38, the longitudinal axis of which lies within the cross-section of the first molded portion half 41. The cross-sectional area of ​​the protrusion 38 increases at least partially along its longitudinal axis, particularly in the direction of a socket located in the second molded portion half (not shown) and complementary to the protrusion 38. The protrusion 38 can be inserted into this socket, thereby forming an interlocking closure. According to the illustrated embodiment, the first molded portion half 41 also has a socket 39, which is open and designed to be complementary to the protrusion of the second molded portion half. The socket 39 is arranged in a fourth segment 40 of the first molded portion half 41, which is elastic. This allows the fourth segment 40 to deform to receive the protrusion of the second molded portion half during assembly and to connect the two molded portion halves 41, 42 to each other by interlocking engagement, thereby achieving a sufficient secure fastening of the two molded portion halves on the measuring tube.

[0035] Figure 3 A longitudinal section of a magnetic induction flowmeter 7, as an example of an automated field device according to the invention, is shown. The magnetic induction flowmeter 7 includes a measuring tube 8 for conducting a freely flowing medium and two terminal process connections. The measuring tube 8 is a longitudinally welded steel tube with an electrically insulating lining coated on its inner lateral surfaces. The measuring arrangement of the magnetic induction flowmeter includes a device 9 for measuring the induced voltage in the freely flowing medium, specifically at least two measuring electrodes arranged diametrically, which are inserted into and secured in an opening provided in the wall of the measuring tube 8 in a medium-contact and medium-sealed manner. Furthermore, the measuring arrangement includes a device 10 for generating a magnetic field penetrating the measuring tube 8, which consists of at least two coils arranged diametrically, configured to generate a magnetic field having a main magnetic field axis extending substantially perpendicular to the measuring electrode axis connecting the two measuring electrodes and the longitudinal axis of the measuring tube 8. A filler level monitoring electrode and a reference electrode are also arranged on the measuring tube 8.

[0036] Electronic components 4, including measuring circuits, operating circuits, and / or control circuits arranged on a circuit board, are housed in a cold-formed housing 5. The housing 5 includes a first, particularly cold-formed, molded housing half 51 connected to a second, particularly cold-formed, molded housing half 52, the housing half-parts arranged diametrically relative to each other. The housing 5 has an opening 6 in which at least partially transparent display glass 29 is arranged. The circuit board has a display 2 arranged on a first circuit board section, which can be viewed through the display glass 29. The outer lateral surface of the measuring tube 8 and both the first and second molded housing halves 41 and 42 define a cavity in which the coil of the device 10 for generating a magnetic field is arranged.

[0037] Figure 4 A schematic view of a longitudinal section of a radar-based fill level measuring device 43, another example of an automated field device, is shown. A radar-based measurement method has been developed to measure the fill level of fill material in container 18 because it is robust and requires minimal maintenance. A key advantage of the radar-based measurement method is its ability to measure fill levels more or less continuously. In the context of this patent application, the term "radar" refers to radar signals with frequencies between 0.03 GHz and 300 GHz. Typical frequency bands for performing fill level measurements are 2 GHz, 26 GHz, 79 GHz, or 120 GHz. Two common measurement principles are the time-of-flight principle (also known as "pulse radar") and the FMCW ("frequency-modulated continuous wave") principle. For example, a fill level measuring device operating according to the time-of-flight method is described in published patent application DE 10 2012 104 858 A1. For a typical construction of an FMCW-based fill level measuring device, see, for example, published patent application DE 10 2013 108 490 A1. Furthermore, the measurement principles of FMCW and pulse radar are described in more detail, for example, in "Radar Level Detection," Peter Devine, 2000. The radar-based fill level measuring device 43 also has a housing 5 in which a molded portion 13 is arranged. The molded portion 13 has a first section with a socket in which the electronic components 4 are arranged. The nature of the first section is similar to... Figure 1 and Figure 2 The automated field devices shown and described have the same nature.

[0038] Figure 5 It shows Figure 2A bottom view of the first molded portion half 41. A socket 19 for accommodating electronic components can be seen. The socket 19 is designed as a through-hole. Additionally, a socket 39 for receiving a protrusion can be seen for forming a frictional and / or interlocking connection. Furthermore, a resiliently formed third segment 23 can be seen. The third segment 23 has a protrusion 27 that is arranged to mechanically contact the outer lateral surface of the measuring tube or container and is at least formed as a sealing lip that extends partially around the measuring tube or container. The protrusion 27 is designed such that when the first molded portion half 41 is arranged on the measuring tube or container, the protrusion 27 is displaced or compressed. Therefore, manufacturing tolerances can be compensated and mechanical stress and / or leakage can be reduced. The third segment 23 is also a thermoplastic and / or elastomer, or in a preferred embodiment, foamed polypropylene having the following compression set. DVR According to ISO 1798, this compression set... DVR 0≤ DVR ≤20%, especially 5≤ DVR ≤15%, and preferably is DVR <15%. Furthermore, the third section 23, particularly the protrusion 27, is designed to have the following elongation at break, wherein, according to ISO 1798, the elongation at break is 10% to 20%, preferably 14% to 16%, and / or to have the following tensile strength, wherein, according to ISO 1798, the tensile strength is 400 to 1300 kPa, particularly 600 to 1000 kPa, and preferably 700 to 880 kPa.

[0039] Figure 6 A perspective view of a centering device 34 is shown, which is used to prevent tangential displacement of the molded portion half within the housing molded portion half and / or on the outer lateral surface of the measuring tube. The centering device 34 has a flange 44 by which it can be integrally connected to the inner housing lateral surface of the housing molded portion half. Furthermore, the centering device 34 has a hook 45 at one end, which is provided for locking into and engaging a socket in the molded portion half, and is thus adapted to form an interlocking and / or frictional connection in the molded portion half and the housing molded portion half. The centering device 34 is formed as a thin, curved sheet metal part, designed to be resilient, at least such that when the molded portion half is inserted into the housing molded portion half in the assembly direction, the hook 45 can be at least partially displaced away from the inner housing lateral surface of the housing molded portion half.

[0040] Figure 7AA perspective view of a partially cut-out housing molded half 51 is shown, in which the first molded half 41 is inserted in a linear assembly direction (see arrow). A centering device 34 is integrally attached to the inner housing lateral surface 24 of the first housing molded half 51 by a joining method, particularly welding. The first housing molded half 51 has at least one curved lug 53 in its second edge portion 62 for forming an interlocking connection with the second housing molded half 52 (not shown). To form this connection, the at least one curved lug 53 is bent such that it interacts with the second edge segment of the contacting second housing molded half, such that the two housing halves can no longer be separated from each other without one of the two housing halves having to undergo plastic deformation. Furthermore, the second edge portion 62 of the first housing molded half 51 includes at least a partially circumferential slot 54 to limit displacement of the second housing molded half in the longitudinal and / or transverse directions of the measuring tube when the two housing halves are assembled (i.e., when the two housing halves are placed together but the bent lug has not yet been bent). The slot 54 also engages in a recess in the second edge segment of the second housing molded half. This recess may be formed as an opening in the second edge segment of the second housing molded half, or it may be formed by the second edge segment of the second housing molded half, which is shortened compared to the second edge segment of the first housing molded half. Thus, the two housing molded halves can be more precisely centered relative to each other during assembly. The at least one bent lug 53 is at least partially integrally connected to the slot 54.

[0041] Figure 7B It shows crossing Figure 7A The details show a cross-section of the first molded portion half 51 of the housing, wherein the first molded portion half 41 is arranged and secured in the final assembled position. The first molded portion half 41 has a socket 46 that engages with an undercut portion, in which a hook 45 of a centering device engages.

[0042] Figure 8 Details of a first embodiment of the edge region of the first molded portion half of the housing in contact with the outer lateral surface of the measuring tube are shown. The housing 5 shown has a housing wall 47 that, together with the molded lateral surface 25 of the measuring tube 8, defines the housing interior 48. The housing wall 47 has a first edge portion 61 that at least partially contacts the molded lateral surface 25 of the measuring tube 8 directly and is bent at least partially away from the housing interior 48. According to the invention, at least the first edge portion 61 is supported by the measuring tube 8. This means that the housing is assembled and fastened to the measuring tube such that the first edge portion 61 deforms and at least partially retains mechanical stress within the housing.

[0043] The first edge portion 61 has no bends, at least in the longitudinal section. Therefore, the flange in the housing wall is not part of the first edge portion 61 according to the invention. Furthermore, in the longitudinal section passing through the field device, the first edge portion 61 has a first edge portion longitudinal axis A (dashed line) intersecting the lateral surface 25 of the molded portion of the measuring tube 8 at an angle α, where the angle α is between 1° and 10° or 5°. The dashed line representing the longitudinal axis of the measuring tube is shown as a reference to the longitudinal axis A of the edge portion.

[0044] The molded portion 13 is arranged within the housing interior 48 and has a molded portion lateral surface 25. Figure 8 In this embodiment, the molding portion lateral surface 25, the housing wall 47, and the outer lateral surface 58 define a sealing seat 59 for a sealing device (not shown) specifically applied in liquid form. The molding portion 13 also has a recess 63 for forming the sealing seat 59, which is designed to be at least partially wedge-shaped. The sealing device at least partially comprises polyurethane, polysiloxane, polyethylene, and / or epoxy resin. The molding portion 13 is at least partially formed of particulate foam comprising at least one of polystyrene, polyphenylene sulfide, foamed polypropylene, and polyurethane.

[0045] Figure 9 Details of a second embodiment of the edge region of the first molded portion of the housing that contacts the outer lateral surface of the measuring tube are shown. Figure 8 The difference in the embodiment is that the housing wall 47 has a flange 56 on the inner housing lateral surface for reinforcing the housing wall 47, which also serves as a reinforcing sealing seat, such that a sealing device (not shown) is at least partially arranged in the flange 56. Furthermore, Figure 9 A protrusion 27 is shown that is in mechanical contact with the outer lateral surface of the measuring tube and is formed at least partially around the periphery of the measuring tube or container as a sealing lip.

[0046] Figure 10 Details of the edge region of the first housing molded portion half 51, which contacts the second housing molded portion half 52, are shown. Each of the first housing molded portion half 51 and the second housing molded portion half 52 has a second edge portion 62 through which they are at least partially in direct contact with each other. The first housing molded portion half 51 and the second housing molded portion half 52 are connected to each other by interlocking and / or frictional engagement via bent lugs (not shown), and are also integrally connected via a sealing device 57 applied in liquid form. The sealing device 57 is arranged in a sealing seat 59 formed by the contacting second edge portions 62, which is defined by the two housing halves at least in the radial direction of the measuring tube 8. The sealing seat 59 is designed to be at least partially wedge-shaped.

[0047] Figure 11 A perspective view showing a cross-section of the sealing seat located between the first and second molded halves of the housing is shown. Figure 11 and Figure 10 The main difference is that, in addition to the sealing seat 59, the two second edge portions 62 together define a collection volume 64 for receiving a sealing device (not shown) that has shifted in the expansion direction. This is achieved by bending a sub-segment of the second edge portion 62, thereby additionally limiting the collection volume 64 in the direction of the measuring tube by the second edge portions 62 that come into contact with each other after assembly. Alternatively, the volume provided as the collection volume 64 can function as the sealing seat, i.e., the sealing device is applied in liquid form to one of the bent sub-segments, and when the two housing halves are clamped and secured, the excess sealing device shifts in the direction of the volume designated as the sealing seat 59 in this embodiment, and the sealing seat 59 thus functions as the collection volume.

[0048] The second edge portion 62 shown has a longitudinal axis C (dashed line) extending parallel to axis X (solid line) in at least a cross-section through the field device, which lies in a central plane. This central plane is traversed by the longitudinal axis of the measuring tube and a transverse axis extending perpendicular to the longitudinal axis. It extends through at least one contact point of the first and second housing molded portions, particularly through the contact point of the second edge portion 62.

[0049] According to an advantageous embodiment, the second edge portions 62 are designed such that they have a second edge portion longitudinal axis B (dashed line) intersecting the central plane at an angle β, wherein β has an angular dimension of 1° to 10°, or 5°. Figure 11 The alternative second edge segment longitudinal axis B is also shown. Alternatively, the second edge segment longitudinal axis B can be incorporated into the second edge segment longitudinal axis C after the two housing halves are clamped and connected.

[0050] List of reference numerals

[0051] Automated field equipment 1

[0052] Monitor 2

[0053] Measurement setup 3

[0054] Electronic Component 4

[0055] Casing 5

[0056] Opening 6

[0057] Magnetic induction flow meter 7

[0058] Measuring tube 8

[0059] Device 9 for measuring the induced voltage

[0060] Device 10 for generating a magnetic field

[0061] Molded part 13

[0062] Container 18

[0063] Socket 19

[0064] Undercut 20

[0065] Part 1, Section 21

[0066] Part Two, Section 22

[0067] Part Three, Section 23

[0068] 24 lateral surfaces of the inner shell

[0069] 25mm lateral surface of the molded part

[0070] Protrusion 27

[0071] Circuit board 28

[0072] Monitor glass 29

[0073] Locking lug 30

[0074] First circuit board section 31

[0075] Second circuit board section 32

[0076] Third circuit board section 33

[0077] Centering device 34

[0078] Guide rail 36

[0079] Electronic Components 37

[0080] 38 protrusions

[0081] Socket 39

[0082] Part 4, Section 40

[0083] First molded part half 41

[0084] Second molded part half 42

[0085] Radar-based fill level measurement device 43

[0086] Flange 44

[0087] Hook 45

[0088] Socket 46

[0089] Shell wall 47

[0090] 48 inside the shell

[0091] First shell molding half 51

[0092] Second shell molding half 52

[0093] Curved protruding ear 53

[0094] Groove 54

[0095] Flange 56

[0096] Sealing device 57

[0097] External lateral surface 58

[0098] Sealing seat 59

[0099] First edge portion 61

[0100] Second edge portion 62

[0101] Depression 63

[0102] Collection volume 64

Claims

1. Automated field equipment (1), including: - Measuring tube (8), said measuring tube (8) is used to conduct a flowable medium, The measuring tube (8) has an outer lateral surface (58). - A measurement setup for determining physical and / or chemical measurement variables of the medium. The measuring arrangement is at least partially arranged on the measuring tube (8). - A housing (5) for housing at least one electronic component (4) for operating the measurement arrangement, controlling control variables of the measurement arrangement, determining the measured values ​​of the measurement variables, and / or evaluating the measurement variables. The housing (5) is arranged on the outer lateral surface (58) and the measuring arrangement is at least partially covered. The housing (5) has a housing wall (47), which together with the external lateral surface (58) defines the interior (48) of the housing. - A molding portion (13) for fixing the at least one electronic component (4) and / or the measuring arrangement. The molded portion (13) is arranged inside the housing (48). The molded portion (13) has a molded portion lateral surface (25). The side surface (25) of the molded portion and the housing wall (47) define the sealing seat (59). The sealing device (57) is arranged in the sealing seat (59). The shell wall (47) has a first edge portion (61) that is at least partially in direct contact with the outer lateral surface (58). Wherein, the first edge portion (61) is bent at least partially away from the interior of the housing (48), Wherein, at least the first edge portion (61) is frictionally locked with the measuring tube (8), The first edge portion (61) has the sealing seat (59).

2. The field device (1) according to claim 1. in, The molded portion (13) has a recess (63) that, together with the outer lateral surface (58) and the housing wall (47), forms a sealing seat (59).

3. The field device (1) according to claim 1. in, The molded portion (13) has a recess (63) that forms a sealing seat (59) together with the housing wall (47).

4. The field device (1) according to claim 1. in, The first edge portion (61) is not curved. The first edge portion (61) has a first edge segment longitudinal axis (A) that intersects the external lateral surface (58) at an angle α in at least a longitudinal section passing through the field device (1). Wherein, α has an angular dimension between 1° and 10°.

5. The field device (1) according to claim 1. in, The housing (5) has a first housing molded portion half (51) and a second housing molded portion half (52). The first housing molding half (51) and the second housing molding half (52) are at least interlocked and / or frictionally connected to each other. The first housing molding half (51) and the second housing molding half (52) each have a second edge portion (62), and the second edge portions (62) are in contact with each other.

6. The field device (1) according to claim 5. in, The second edge portions (62) that are in contact with each other define the sealing seat (59) at least in the radial direction of the measuring tube (8).

7. The field device (1) according to claim 5. in, The contacting edge portions (62) further define the sealing seat (59) in the direction of the measuring tube (8).

8. The field device (1) according to claim 5. in, At least in the cross-section through the field device (1), each of the second edge portions (62) has a second edge segment longitudinal axis (B) that intersects the central plane at an angle β. Wherein, the angle β has an angular dimension of 1° to 10°. The central plane is spanned by the longitudinal axis of the measuring tube (8) and a transverse axis extending perpendicular to the longitudinal axis. The central plane extends through at least one contact point of the second edge portion (62).

9. The field device (1) according to claim 1 or 2. in, The sealing seat (59) is at least partially wedge-shaped.

10. The field device (1) according to claim 1 or 2. in, The sealing device (57) comprises at least in part a substance from the following list: polyurethane, Polysiloxane, Polyethylene, Epoxy resin.

11. The field device (1) according to claim 1 or 2. in, The molded portion (13) is at least partially formed of granular foam.

12. The field device (1) according to claim 5. in, The first edge portion (61) and the outer lateral surface (58) and / or portions of the second edge portion (62) of the first housing molding portion half (51) and the second housing molding portion half (52) together define a collection volume (64) for receiving a sealing device (57) that has shifted in the expansion direction. The collection volume (64) is at least partially filled with the sealing device (57).

13. The field device (1) according to claim 1, wherein, The molded portion lateral surface (25), the housing wall (47), and the outer lateral surface (58) define the sealing seat (59).

14. The field device (1) according to claim 1, wherein, The sealing device (57) is applied in liquid form.

15. The field device (1) according to claim 2, wherein, A flange (44) is inserted into the housing wall (47) to reinforce the housing wall (47).

16. The field device (1) according to claim 4, wherein, α has an angular dimension of 5°.

17. The field device (1) according to claim 8, wherein, The angle β has an angular dimension of 5°.

18. The field device (1) according to claim 11, wherein, The granular foam contains at least one substance from the following list: Polystyrene Polyphenylene sulfide, Foamed polypropylene, Polyurethane.

19. The field device (1) according to claim 5, wherein, The first housing molded portion half (51) and the second housing molded portion half (52) are interlocked, frictionally connected and integrally connected to each other.

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