HYGIENE-COMPLIANT ADAPTER FOR FIELD EQUIPMENT

Description

[0001] The invention relates to a fastening arrangement for inserting a field device into a container, an adapter arrangement with a fastening arrangement according to the invention, and a measuring arrangement with an adapter arrangement according to the invention. The field device comprises a housing and a sensor, wherein the sensor of the field device extends at least partially into the container. The field device serves to determine and / or monitor a physical or chemical process variable of a medium in the container.

[0002] Field devices are used to monitor and / or determine at least one process variable, such as a chemical or physical variable, of a medium. For the purposes of this application, field devices essentially refer to all measuring devices that are used close to the process and that provide or process-relevant information. A large number of such field devices are manufactured and distributed by companies in the Endress + Hauser Group.

[0003] The process variable to be determined by the field device can be the fill level, flow, pressure, temperature, pH value, redox potential, or conductivity of the respective medium. The different possible measuring principles corresponding to the process variable are known from the state of the art and will not be explained further here. Field devices for measuring fill levels are designed in particular as microwave level gauges, ultrasonic level gauges, time domain reflectometric level gauges (TDR), radiometric level gauges, capacitive level gauges, conductive level gauges, and vibronic level gauges. Field devices for measuring flow, on the other hand, operate according to the Coriolis, ultrasonic, vortex, thermal, and / or magnetic inductive measuring principles. Pressure gauges are preferably so-called absolute, gauge, or differential pressure devices.

[0004] A field device comprises at least one sensor that comes into contact with the process at least partially and at least temporarily, and electronics that serve, for example, to acquire, evaluate, and / or supply signals. The electronics of the field device are typically arranged in a housing and additionally have at least one connection element for connecting the electronics to the sensor and / or an external unit. The connection element can be any type of connection; a wireless connection is also possible. The electronics and the sensor of the field device can be configured as separate units with separate housings or as a single unit with a single housing.

[0005] The medium containing the process variable to be monitored or determined by the field device is typically located in a container. With non-invasive field devices, the sensor does not need to be in direct contact with the medium and is therefore often attached to the outside of the container. With invasive field devices, the field device sensor protrudes into the container or is flush with the container wall. The field device sensor is then often attached to an opening in / on the container using a fastening mechanism, typically using a sealing element. This can create gaps, joints, and / or dead spaces. Germs can potentially collect and / or deposits or biofilms can form in such gaps, joints, and / or dead spaces. These germs and / or deposits, in turn, are unacceptable for sterile applications, for example in the pharmaceutical or food industries.

[0006] In this context, various international and national regulatory authorities have developed standards for the manufacture and design of equipment approved for sterile processing. In the Americas, these include the standards of the American Society of Mechanical Engineers (ASME), particularly the so-called "ASME Bioprocessing Equipment" (BPE) standard, and those of the 3-A Sanitary Standards Incorporation (3-A). In Europe, the European Hygienic Design Group (EHEDG) is particularly relevant. These standards meet high hygiene requirements and, above all, define guidelines for preventing contamination and for the easy mechanical cleaning or sterilization of surfaces involved in the process. For example, the EHEDG emphasizes that a gap-free design must be used when using sealing elements.According to EHEDG, direct metal-to-metal connections in contact with the medium must be welded. Since the vessels are usually made of metal, (metallic) adapters for attaching a field device to the vessel are often welded into the vessel. However, other fastening options, such as clamps or screws, are also conceivable for non-metallic vessels.

[0007] Numerous fastening systems for field devices in a container have become known from the prior art. However, not all of them meet the current requirements of hygiene standards and / or have disadvantages when installing the fastening system. A fastening arrangement for a field device is disclosed in document US 2018 / 348022 A1, wherein the fastening arrangement comprises a connection adapter, a first fastening element, and a second fastening element.

[0008] A common method for attaching a field device to a container is a one-piece adapter. The adapter is attached to an opening in the container wall and has an internal thread. The adapter has a groove facing the process, into which a sealing ring is inserted. The field device has a threaded section and can be screwed into the adapter so that part of the field device's sensor protrudes through the adapter into the container or is flush with the container wall. During assembly, the sealing ring is first placed in the adapter, and then the field device is screwed through the sealing ring into the adapter. The problem with this approach is that inserting the field device into the adapter requires a high torque, which puts stress on the sealing ring and the thread. As an additional problem, it is occasionally necessary to replace the sealing ring.This may be necessary due to the replacement of the field device, due to wear on the sealing ring, or may be required regularly for hygienic reasons. To replace the sealing ring, the adapter installed in the container must be manually removed from the groove and a new one inserted. Since the adapter is usually welded into the container and therefore not easily removable, manually installing the sealing ring is a cumbersome procedure. The groove used often has cavities for the sealing ring to expand with temperature, humidity, etc. Therefore, such an adapter is not permitted for hygienic applications in many cases.

[0009] Another method for attaching a field device is a multi-part adapter system. Such adapter systems consist, for example, of a weld-in adapter, an adapter ring, a union nut, and a molded seal. The weld-in adapter has a groove in the process direction for the molded seal to rest on, and a section with a thread. The adapter ring, which also has a support for the molded seal in the process direction, is inserted into the weld-in adapter. The adapter ring is connected to the weld-in adapter using the union nut. The field device, with at least a section of the sensor, is then guided through the assembled adapter system into the container. However, such a multi-part fastening arrangement is often comparatively cost-intensive and complex to manufacture and assemble.

[0010] DE 103 08 086 B3 describes a multi-part fastening system with at least one sealing ring, one adapter ring, and at least one sleeve. The field device protrudes through the sleeve into the container with at least part of the sensor. The sleeve has a change in diameter in the direction of the process to accommodate a sealing ring. The adapter ring can be inserted into the sleeve and has a surface in the direction of the process to accommodate the sealing element. The sealing element is thus held in place by the adapter ring and sleeve. The field device can be inserted into the adapter ring and the sleeve and is fastened to the sleeve. During assembly, the adapter ring and the sealing ring are first applied to the field device before the field device is inserted into the sleeve.The adapter ring is not attached to the field device, but rather sits on a support surface of the field device before the field device is inserted into the sleeve and is held in place by the sealing ring. Therefore, this mounting method is only suitable for field devices that have a support surface for attaching the adapter ring. Since the support surface of the field device typically connects to the sensor and the adapter ring therefore sits on the sensor, the adapter ring also reduces the contact area between the sensor and the medium.

[0011] It has become known that, in order to check the tightness of the arrangement, a leakage hole or leakage bore can be provided in an outer surface of the base body of the adapter in an area facing the process. In the unlikely event of a leak, i.e. the medium passing from the container into the adapter, the medium can escape from the adapter via the leakage hole. The leakage bore therefore immediately indicates if the sealing element within the adapter is defective or misaligned. Arrangements without a leakage hole do not comply with the guidelines for hygienic applications, in particular not with the EHEDG guidelines. Accordingly, leakage holes are typically found in arrangements that are intended to meet high hygiene standards, such as the arrangement described above in DE 103 08 086 B3.

[0012] Based on the cited prior art, the present invention is based on the object of providing an arrangement for fastening a field device to a container, which meets the usual hygiene requirements in a particularly simple manner.

[0013] The object is achieved according to the invention by the fastening arrangement according to claim 1, the adapter arrangement according to claim 3 and the measuring arrangement according to claim 11.

[0014] With regard to the fastening arrangement for introducing a field device into a container, wherein the field device comprises a housing and a sensor, wherein the sensor of the field device protrudes at least partially into the container, and wherein the field device serves to determine and / or monitor a physical or chemical process variable of a medium in the container, the object is achieved by a fastening arrangement comprising a connecting adapter and a sealing element.

[0015] The connection adapter comprises a cylindrical base body on which the following components are arranged: a first fastening element for fastening the connection adapter to the field device, wherein the connection adapter can be fastened to the field device in such a way that the connection adapter at least partially surrounds the field device when it is fastened to the field device; a second fastening element for fastening the connection adapter to a container adapter, wherein the connection adapter can be fastened to the container adapter in such a way that the container adapter at least partially surrounds the connection adapter when it is fastened to the connection adapter; and a first support of the connection adapter for receiving a sealing element. The inventive design of the fastening arrangement enables the sealing element to be received on the first support of the connection adapter.

[0016] After attaching the connection adapter to the field device, the sealing element is placed on the first support and guided at least partially over the field device's sensor. The sealing element is therefore positioned before the field device is attached to the container. Only after the connection adapter has been attached to the field device and the sealing element has been inserted is the field device attached to the container adapter, which is then attached to the container. This also makes the sealing element particularly easy to replace.

[0017] When inserting the field device into the container adapter, little force is required before the field device reaches its final position on the container adapter, as mechanical friction between the sealing element and the container adapter can be avoided by using the fastening arrangement. Increased force is only required shortly before the field device reaches its final position on the container adapter, as the sealing element is then pressed between the first support and another support on the container adapter. Compared to existing solutions, the force required and the friction on the sealing element are thus reduced overall. According to the invention, the sealing element is not attached to the container on the process side, but is arranged directly on the field device using the connecting adapter. This allows the sealing element to be positioned precisely.This is important to position the sealing element in the position that ensures optimal sealing of the assembly after the field device is inserted into the container. This position, referred to as the target position, can be immediately checked visually.

[0018] To fasten the field device to the container, on the one hand, the container adapter according to the invention can be used, as described in the adapter arrangement below. On the other hand, any suitable second adapter can also be used, which is, for example, already fastened to a container and which fulfills the function of fastening the field device to the container. The fastening arrangement can thus be used as a retrofit for fastening a field device to a container, wherein the sealing element is first inserted into the field device using the connection adapter. This retrofit is particularly advantageous for field devices in which a sealing element cannot be easily positioned on a housing of the field device before the field device is fastened to the container.This is the case, for example, with field devices that have a constant diameter of the housing in an area that is guided through the container adapter or second adapter and into the container.

[0019] The sealing element is designed to be received on the support of the connection adapter. In an advantageous embodiment, the sealing element is an O-ring or a molded seal. Depending on the design of the support, the sealing element can be placed on the support or pressed into it with light pressure. The sealing element is received in the first support after the connection adapter is attached to the field device. The sealing element can be designed to fit, i.e., form-fit, the support.

[0020] The object underlying the present invention is further achieved by an adapter arrangement for introducing a field device into a container, comprising a fastening arrangement according to the invention according to at least one of the described embodiments and a container adapter.

[0021] The container adapter comprises a cylindrical base body on which the following components are arranged: a third fastening element for fastening the container adapter to the container; a fourth fastening element for fastening the container adapter to the connecting adapter by means of the second fastening element; and a second support of the container adapter for receiving the sealing element.

[0022] By placing the sealing element between the first support of the connection adapter and the second support of the container adapter, the sealing element can be guided into the target position using the two supports, ensuring the tightness of the adapter arrangement. The two supports serve to guide and position the sealing element in the desired target position, which guarantees a particularly high level of tightness of the adapter arrangement. The adapter arrangement ensures that there are no gaps, joints, or dead spaces in the process direction thanks to the sealing element. The adapter arrangement thus ensures a tight and hygienic arrangement of the field device relative to the container. The adapter arrangement advantageously complies with the guidelines for hygienic applications.Because the connection adapter is detachably attached to the container adapter, the connection adapter, including the field device and the sealing element, can be separated from the container adapter, and the sealing element attached to the connection adapter can then be replaced. Furthermore, a multi-part adapter design is used, which is easy to manufacture and install, as it consists of only two adapters and one sealing element.

[0023] In one embodiment, the first and / or second support is / are configured in the form of a change in the outer diameter of the connecting adapter or the container adapter, in particular a shoulder or a support surface. Other possible configurations include an edge, a shoulder, or a groove.

[0024] A preferred embodiment includes the first and second supports being designed to complement each other. The two supports thus interact in such a way that the sealing element can be accommodated between the two supports when the connecting adapter is attached to the container adapter. The first and second supports hold the sealing element in position by both the connecting adapter and the container adapter. This prevents the sealing element from shifting in or against the process direction.

[0025] In a further embodiment, the first and second supports exert a force on the sealing element when the connecting adapter is attached to the container adapter. The sealing element is deformed radially and / or axially as a result of the force imparted by the supports. The supports and / or the sealing element are designed in particular such that the deformed sealing element fills the two supports, in particular with a precise fit, thereby avoiding gaps, joints, and / or dead spaces.

[0026] In another embodiment, at least one hole is arranged in the region of a lateral surface of the main body of the connection adapter and the main body of the container adapter. The hole in the connection adapter or the container adapter is arranged along a longitudinal axis of the main body of the connection adapter and the main body of the container adapter in such a way that the first or second support is / are arranged between the hole in the connection adapter or the hole in the container adapter and an end section of the connection adapter or the container adapter facing the container. In particular, the respective holes in the connection adapter or the container adapter are each arranged in a region of the connection adapter or container adapter in which no fastening elements and no support are arranged. The hole, or leakage hole, typically has a diameter of a few millimeters.of the container adapter is used to check the tightness of the sealing element of the adapter arrangement, as already described in the introduction.

[0027] An advantageous embodiment includes that the respective holes of the connection adapter and the container adapter are arranged such that the hole in the connection adapter and the hole in the container adapter at least partially overlap, in particular are aligned with one another, when the connection adapter is attached to the container adapter. The overlap of the hole in the connection adapter with the hole in the container adapter makes it easy to detect medium escaping from the container if the sealing element does not effectively seal the field device from the contents of the container. This configuration of the two holes in the connection adapter and the container adapter particularly relates to the case of medium overflowing along the inner edge of the sealing element. In such a case of leakage, the medium escapes along the sensor of the field device through the hole in the connection adapter and through the hole in the container adapter from the adapter arrangement.Advantageously, one hole is designed with a larger diameter than the diameter of the other hole in order to ensure the overlap of the two holes, taking into account the tolerances of the second and fourth fastening element. The holes are in particular aligned such that the medium entering the adapter arrangement from the container can escape from the holes as directly as possible due to gravity. Furthermore, it is advantageous if the outer surface of the connecting adapter, at least in the area of ​​the hole in the connecting adapter, and the inner surface of the base body of the container adapter in the area of ​​the hole in the container adapter do not rest on one another or have no contact. Instead, a space, in particular a radial one-round space, in particular on the order of millimeters, is arranged between the two areas. In the event of a leak, the medium can thus easily escape from the adapter arrangement.

[0028] A further embodiment provides that the third fastening element comprises a device for welding, screwing, or clamping. Consequently, the container adapter can be attached to the container using conventional flange, weld, or clamp connections.

[0029] Advantageously, the container adapter has a greater wall thickness in an end region of the container adapter facing away from the container than the base body of the container adapter in a central region if the third fastening element of the container adapter comprises a welding device. The greater wall thickness, which can also be a bead or a material reinforcement, serves to protect against deformation of a region of the container adapter when welding the container adapter into the container.

[0030] The object underlying the present invention is further achieved by a measuring arrangement for introducing a field device into a container, comprising a fastening arrangement according to the invention according to at least one of the described embodiments, a container adapter according to the invention according to at least one of the described embodiments and a field device.

[0031] The field device comprises electronics and a sensor. Typically, the sensor and electronics of the field device are at least partially enclosed by at least one housing. The housing of the field device also has a fifth fastening element for attaching the field device to the connection adapter using the first fastening element.

[0032] In the measuring arrangement according to the invention, the connection adapter is first attached to the field device and the sealing element is applied to the first support, whereby the sealing element is pushed over the sensor of the field device. The connection adapter, including the field device and the sealing element, is then attached to the container adapter. During the insertion of the field device into the container adapter, the sealing element is subjected to a low application of force until shortly before the field device reaches its final position in the container adapter. Only when the sealing element, which is held in the first support, is placed on the second support, which occurs shortly before the field device reaches its final position in the container adapter, is increased force required to deform the sealing element between the first and second supports. The sealing element is fitted between the two supports, so that a high level of tightness of the measuring arrangement is achieved.The field device can be designed in such a way that the diameter of the field device decreases slightly from the area of ​​the first support towards an end area of ​​the sensor facing the medium, so that the sealing element can be applied to the field device particularly easily. Since the sealing element is first applied to the field device using the connection adapter, visual inspection of the target position of the sealing element is possible. When the connection adapter is attached to the container adapter, the sealing element is guided into the desired target position by the two supports, in particular automatically, and cannot slip in or against the process direction. Due to the high tightness of the arrangement and the absence of dead spaces, gaps, etc., the measuring arrangement meets the current guidelines of hygiene standards. The multi-part measuring arrangement enables easy installation of the field device on the container.

[0033] An advantageous embodiment provides that at least a first region of the field device, which at least partially projects into the connection adapter when the field device is fastened to the connection adapter, and at least a second region of the field device, which at least partially projects into the container adapter and into the container when the field device is fastened to the container adapter by means of the connection adapter, have the same outer diameter. Field devices configured in this way particularly benefit from the measuring arrangement or adapter arrangement according to the invention. It is advantageous if, in particular, the fifth fastening element, when arranged in the first or second region of the field device, does not cause any change in the outer diameter of the first and second regions of the field device.

[0034] According to a further embodiment, at least one of the fastening elements comprises a thread. Advantageously, the first and fifth threads, or the second and fourth threads, are designed to complement each other. In particular, an internal thread and a complementary external thread cooperate. The first, second, fourth, and fifth fastening elements are designed, in particular, as detachable fastening elements. The third fastening element will generally comprise a welding device for hygienic applications, although other fastening methods are also possible for non-metal-to-metal connections between the container adapter and the container.

[0035] In a further embodiment, the field device is a field device operating according to the capacitive and / or conductive measuring principle. In this case, the process variables to be determined and / or monitored are the fill level, the conductivity, or the dielectric constant. However, the present invention is by no means limited to such field devices, but rather can be used for numerous different field devices based on different measuring principles, such as those mentioned in the introduction to the description.

[0036] The invention is explained in more detail in the following drawings Fig. 1 - Fig. 5 explained in more detail. It shows: Fig. 1 a schematic representation of a capacitive and / or conductive field device according to the state of the art, Fig. 2 an embodiment of the fastening arrangement according to the invention, Fig. 3 an embodiment of the fastening arrangement according to the invention, which is connected to the field device, Fig. 4 an embodiment of the container adapter according to the invention, and Fig. 5 an embodiment of the measuring arrangement according to the invention.

[0037] The present invention is applicable to a variety of different field devices 1. Without limiting the generality, however, the following description refers for the sake of simplicity to a capacitive and / or conductive field device 1, as in Fig. 1 shown schematically. The process variables to be measured by field device 1 are, in particular, the fill level, conductivity, or dielectric constant. These considerations can be applied analogously to other field devices. For the solution according to the invention, the geometry of the field device is primarily important, since the invention relates to the arrangement of a device in a container.

[0038] The measurement processes underlying a capacitive and / or conductive field device, in particular a level measuring device, are known from the prior art. Corresponding field devices are manufactured and marketed by the applicant, for example, under the names "Nivector," "Liquicap," and "Liquipoint." A schematic representation of a corresponding field device is shown in Fig. 1 shown. The sensor 2 and the electronics 3 of the field device 1 are designed as a single, compact unit. To measure the fill level, the sensor 2 of the field device 1 protrudes at least partially into the container. The sensor 2 comprises a coaxially constructed electrode group (not shown) which is connected to the electronics 3. The electronics 3 monitors or determines the fill level of the medium in the container based on the signal from the electrode group of the sensor 2 of the field device. At least one electrode of the electrode group is subjected to an excitation signal, and the process variable is determined based on the signal received by the electrode. For further details, reference is made to, for example, DE 10 2018 101 206 A1, DE 10 2014 118 547 A1, or DE 10161069A1.

[0039] The electronics 3 has a connection element 3a for connecting the electronics 3 to an external unit. Furthermore, the sensor 2 and the electronics 3 of the field device 1 are enclosed by a housing 4. The housing 4 also has a fifth fastening element 5e, which, for simplicity, includes an external thread. However, other fastening options for the fastening element 5e can also be used.

[0040] Fig. 2 shows a possible embodiment of the fastening arrangement in longitudinal section, comprising a connection adapter 6 and a sealing element 7. The connection adapter 6 has a cylindrical base body 6a, a first fastening element 5a for fastening the connection adapter 6 to the field device 1, and a second fastening element 5b for fastening the connection adapter 6 to a container adapter 8. The connection adapter 6 can be fastened to the field device 1 in such a way that the connection adapter 6 at least partially surrounds the field device 1 when it is fastened to the field device 1. In addition, the connection adapter 6 can be fastened to a container adapter 8 (not shown here) by means of the second fastening element 5b in such a way that the container adapter 8 at least partially surrounds the connection adapter 6 when it is fastened to the connection adapter 6. The first fastening element 5a is in Fig. 2 For the sake of simplicity, it is designed as an internal thread. The second fastening element 5b is designed as an external thread for the sake of simplicity. Other fastening options for the first and second fastening elements are not excluded. The connecting adapter 6 also has a first support 9a for receiving the sealing element 7. The sealing element 7, which is an O-ring or a molded seal, can be received on the support 9a of the connecting adapter.

[0041] In Fig. 3 A possible embodiment of the fastening arrangement according to the invention, which is attached to the field device 1, is shown. The connection adapter 6 is first attached to the field device 1 by means of the first and fifth threads 5a,e, which are complementary to each other, before the sealing element 7 is received over the sensor 2 of the field device 1 in the first support 9a of the connection adapter. Thus, the sealing element 7 can be received on the field device 1 by means of the connection adapter 6, and the target position of the sealing element 7 can be visually checked.

[0042] A possible design of the container adapter 8 is shown in Fig. 4 shown. The cylindrical base body 8a of the container adapter 8 comprises a third fastening element 5c for fastening the container adapter 8 to the container (not shown), a fourth fastening element 5d for fastening the container adapter 8 to the connecting adapter 6 by means of the second thread 5b and a second support 9b of the container adapter 8 for receiving the sealing element 7. The third fastening element 5c is in Fig. 4 as a device for welding. Alternatively, a device for clamping or screwing could also be used. In addition, the container adapter 8 has a greater wall thickness 11 of the base body in an end region facing away from the container compared to a central region. This greater wall thickness 11, or material reinforcement or bead, serves here as protection against deformation of the container adapter 8 during welding into the container. The fourth fastening element 5d comprises Fig. 3 an internal thread; however, other fastening options are not excluded in this case either. Advantageously, the first and second supports 9a,b are each designed as a support surface, whereby further alternatives to the design of the supports, such as a change in the outer diameter of the connecting adapter, are also possible. The design of the complementary supports is subsequently described in Fig. 5 visible. In the area of ​​the lateral surface of the container adapter 8, a hole 10b is arranged along the longitudinal axis of the container adapter 8. The second support 9b is arranged between the hole 10b of the container adapter and an end section of the container adapter 8 facing the container. In the adapter arrangement, the connecting adapter 6 also has a hole 10a in a corresponding area. This is determined based on the measuring arrangement in Fig. 5 be explained in more detail.

[0043] Fig. 5 shows a design of the measuring arrangement with field device 1, connection adapter 6, container adapter 8 and sealing element 7. In comparison to Fig. 3 Here, the container adapter 8 is additionally fastened to the connection adapter 6 by means of the mutually complementary second and fourth threads. The field device 1 has a constant outer diameter in the first area, which projects into the connection adapter 6, and in the second area, which projects into the container adapter 8 and the container. The fifth thread 5e does not change the outer diameter of the field device 1. The first and second supports 9a,b are designed to be complementary to one another, so that the sealing element 7 can be received precisely between the two supports when the connection adapter 6 is fastened to the container adapter 8. The first and second supports 9a,b enclose the sealing element 7 and simultaneously exert a force on the sealing element 7, whereby it is deformed radially and / or axially.The two holes 10a,b of the connection adapter and the container adapter are arranged such that they are aligned with each other within the assembled measuring arrangement. Alternatively, the two holes 10a,b can also at least overlap. A gap 12 connects the outer diameter of the sealing element 7 with the two holes 10a,b and is arranged radially between the outer surface of the connection adapter and the inner surface of the container adapter. The gap 12 is optional and can be combined with other configurations as desired. The combination of the holes 10a,b and the gap 12 allows for easy escape of the medium in the event of a leak. Bezugszeichenliste

[0044] 1Field device 2Sensor 3Electronics 3aConnection element 4Housing 5Fastening element 5aFirst fastening element 5bSecond fastening element 5cThird fastening element 5dFourth fastening element 5eFifth fastening element 6Connection adapter 6A-cylindrical base body of the connection adapter 7Sealing element 8Container adapter 8A-cylindrical base body of the container adapter 9Support 9aFirst support of the connection adapter 9bSecond support of the container adapter 10Hole 10aHole of the connection adapter 10bHole of the container adapter 11Larger wall thickness of the container adapter 12Gap

Claims

1. A mounting arrangement for introducing a field device (1) into a container, wherein the field device (1) comprises a housing (4) and a sensor (2), wherein the sensor (2) of the field device projects at least partially into the container, and wherein the field device (1) serves to determine and / or monitor a physical or chemical process variable of a medium in the container, comprising a connection adapter (6) comprising a cylindrical base body (6a) on which the following components are arranged: a. a first fastening element (5a) for fastening the connection adapter (6) to the field device (1), wherein the connection adapter (6) can be fastened to the field device (1) in such a way that the connection adapter (6) at least partially surrounds the field device (1) when it is fastened to the field device (1), b. a second fastening element (5b) for fastening the connection adapter (6) to a container adapter (8), wherein the connection adapter (6) can be fastened to the container adapter (8) in such a way that the container adapter (8) at least partially surrounds the connection adapter (6) when it is fastened to the connection adapter (6), c. a first seat (9a) of the connecting adapter (6) for receiving a sealing element (7) on an end surface of the base body (6), and a sealing element (7), wherein the sealing element is configured such that it can be received on the seat (9a) of the connection adapter (6) and wherein the sealing element (7) is arranged in contact with the medium when the field device (1) is introduced into the container.

2. A mounting arrangement according to claim 1, wherein the sealing element (7) is an O-ring or a molded seal.

3. An adapter assembly for introducing a field device (1) into a container, comprising - a mounting assembly according to at least one of the previous claims and - a container adapter (8) for mounting the field device (1) on the container, comprising a cylindrical base body (8a) on which the following components are arranged: a. a third fastening element (5c) for fastening the container adapter (8) to the container, b. a fourth fastening element (5d) for fastening the container adapter (8) to the connection adapter (6) by means of the second fastening element (5b), and c. a second seat (9b) of the container adapter (8) for receiving the sealing element (7).

4. Adapter arrangement according to claim 3, wherein the first and / or the second seat (9a,b) is / are configured in the form of a change in the external diameter of the connecting adapter (6) or of the container adapter (8), in particular a shoulder, or a bearing surface.

5. Adapter arrangement according to claim 3 or 4, wherein the first and second bearing surfaces (9a,b) are designed to be complementary to one another and interact in such a way that the sealing element (7) can be accommodated between the two bearing surfaces when the connecting adapter (6) is attached to the container adapter (8).

6. Adapter arrangement according to claim 5, wherein the first and second supports (9a,b) exert a force on the sealing element (7) when the connection adapter (6) is attached to the container adapter (8), wherein the sealing element (7) is radially and / or axially deformable as a result of the force transmitted by the supports.

7. Adapter arrangement according to at least one of claims 3-6, wherein at least one hole (10a,b) is arranged in each case in the region of a lateral surface of the base body of the connection adapter (6) and of the base body of the container adapter (8), wherein the hole of the connection adapter or of the container adapter is arranged along a longitudinal axis of the base body of the connection adapter (6) and of the base body of the container adapter (8) is arranged in each case such that the first and second bearing surfaces (9a, b) are arranged between the hole of the connecting adapter (10a) or the hole of the container adapter (10b) and an end section, facing the container, of the connecting adapter (6) or of the container adapter (8).

8. Adapter arrangement according to claim 7, wherein the respective holes of the connecting adapter (10a) and of the container adapter (10b) are arranged such that the hole of the connecting adapter (10a) and the hole of the container adapter (10b) at least partially overlap, in particular are aligned with one another, when the connecting adapter (6) is attached to the container adapter (8).

9. Adapter arrangement according to at least one of claims 3-8, wherein the third fastening element (5c) of the container adapter (8) comprises a device for welding, screwing or clamping.

10. An adapter arrangement according to claim 9, wherein the container adapter (8) has a greater wall thickness (11) in an end region of the container adapter, which is remote from the container, than the base body of the container adapter in a central region, when the third fastening element (5c) of the container adapter comprises a device for welding.

11. A measuring arrangement for introducing a field device (1) into a container, comprising - a fastening arrangement according to at least one of Claims 1-2, - a container adapter (8) according to at least one of claims 3-10, and - a field device (1) comprising electronics (3) and a sensor (2), the sensor (2) and the electronics (3) of the field device (1) being at least partially surrounded by at least one housing (4), and wherein the housing (4) of the field device has a fifth fastening element (5e) for fastening the field device (1) to the connection adapter (6) by means of the first fastening element (5a).

12. Measuring arrangement according to claim 11, wherein at least a first region of the field device (1), which at least partially projects into the connection adapter (6) when the field device (1) is attached to the connection adapter (6), and at least a second region of the field device (1), which at least partially projects into the container adapter (8) and into the container when the field device (1) is attached to the container adapter (8) by means of the connection adapter (6) have the same external diameter, in particular the fifth fastening element (5e), when it is arranged in the first or second region of the field device, not causing any change in the external diameter of the first and second region of the field device.

13. Measurement arrangement according to at least one of claims 11-12, wherein at least one of the fastening elements (5a-e) comprises a thread.

14. Measurement arrangement according to claim 13, wherein the first and fifth (5a,e) and the second and fourth (5b,d) threads are designed to be complementary to one another, in particular wherein in each case an internal thread and a complementarily designed external thread interact.

15. Measuring arrangement according to at least one of claims 11-14, wherein the field device (1) is a field device operating according to the capacitive and / or conductive measuring principle, wherein a process variable is in particular the filling level, the conductivity or the dielectric constant.