System for detecting a measured variable of a fluid guided in a fluid guided line, flowing device for arrangement on a fluid guided line for attachment of a flow

Abstract

The invention relates to a system for detecting a measured variable of a fluid conducted by a fluid conducting line, comprising: a flow meter, in particular an ultrasonic flow meter, for detecting the measured variable; -a flow-through device (10) for arrangement on a fluid-conducting line and for attachment of a flow meter in order to detect a measured variable of the fluid conducted by the line, the flow-through device having:-a first connection (12) and a second connection (14) by means of which the flow-through device (10) can be connected to the fluid-conducting line; and-a measurement region (16) arranged between the first connection (12) and the second connection (14), the measurement region (16) being coupleable to a flow meter for detecting a measurement variable, the first connection (12), the measurement region (16) and the second connection (14) defining a flow path (A) for a fluid through the flow-through device (10), and the measurement region (16) having at least two contact surfaces (20), the at least two contact surfaces (20) extend at least partially along the flow path (A) to contact the flow meter. The at least two contact surfaces (20) are designed to secrete a coupling agent under the action of a contact pressure, and the flow meter is designed such that at least a contact pressure is applied on the at least two contact surfaces (20) by coupling the flow meter to the measurement region (16). The invention further relates to a circulation device and application thereof.

Description

Technical Field

[0001] The application relates to a system for detecting a measured variable of a fluid conducted in a fluid conducting line, a flow-through device for arrangement on a fluid conducting line and for attaching a flow meter, and the use of a flow-through device. Background Art

[0002] In a large number of methods in the automation of industrial or laboratory processes, flow measurements are performed in tube, pipe and hose systems to monitor the processes. Among them, inline flow measuring devices and clamp-on flow measuring devices are used for flow measurement. Inline flow measuring devices have a measuring sensor that is installed in the flow profile of the fluid or medium to be measured, while clamp-on flow measuring devices are placed from the outside and clamped onto the line, pipe or hose that conducts the fluid or medium.

[0003] In addition, a clamp-on flow measuring device is known, in which a flow device is installed in a plastic hose that guides a fluid or medium so that the fluid or medium flows through the flow device. A flow measuring device is attached to the flow device, which inputs an appropriate input signal such as an ultrasonic signal into the flow device installed in the plastic hose and performs flow measurement based on an output signal received via the flow device, the output signal being based on the input signal. Summary of the invention

[0004] The object of the present application is to provide a system for detecting a measured variable of a fluid guided by a fluid guiding line, which system is capable of increasing the accuracy of the flow measurement. In addition, the object of the present application is to propose a flow device for being arranged on a fluid guiding line and for attaching a flow meter, and the use of the flow device, which flow device and the use of the flow device enable the measured variable to be recorded as accurately as possible.

[0005] This object is achieved by the subject matter of the independent claims. Preferred embodiments are presented in the dependent claims.

[0006] A first aspect relates to a system for detecting a measured variable of a fluid conducted by a fluid conducting line, the system comprising:

[0007] - flow meters, in particular ultrasonic flow meters, for detecting the measured variable,

[0008] - a flow-through device for arrangement on a fluid-conducting pipeline and for attaching a flow meter for detecting a measured variable of the fluid guided by the pipeline, the flow-through device having:

[0009] a first connection and a second connection, via which the flow-through device can be connected to a fluid-conducting line,

[0010] a measuring region, arranged between the first connection and the second connection, connectable to a flow meter for detecting a measured variable, wherein the first connection, the measuring region and the second connection define a flow path for a fluid through the flow-through device,

[0011] wherein the measuring region has at least two contact surfaces, which extend at least partially along the flow path, for contacting the flow meter,

[0012] wherein the at least two contact surfaces are designed to secrete a coupling agent when contact pressure is applied; and

[0013] Therein, the flow meter is designed such that by coupling the flow meter to the measuring region, the flow meter exerts a contact pressure at least on at least two contact surfaces.

[0014] Advantageously, the secretion of the coupling agent enables an improved signal transmission between the flow meter and the contact surface, which leads to a better detection of the measured variable. In particular, in ultrasonic flow meters, which couple an input signal, preferably an ultrasonic signal, via the contact surface into the measurement region and receive an output signal based on the input signal, the coupling agent results in a better signal transmission in the signal path. In particular, the coupling agent, which is preferably a liquid, reduces the gas phase in the signal path. The gas phase in the signal path arises in particular from a cavity filled with a gaseous fluid, such as ambient air, and the cavity is located between the contact surface and the flow meter. Due to the secretion of the contact agent, the gaseous fluid can be replaced by the coupling agent, so that now there is a liquid phase in the signal path, which improves the signal transmission.

[0015] In particular, the first connection part and the second connection part and the measuring area arranged between the first connection part and the second connection part may have a channel or flow channel, which defines a flow path and through which the fluid or medium flows. As a fluid guiding pipeline that can be connected to the first connection part and the second connection part, a pipe or a hose made of plastic, for example, can be provided. For example, in order to attach the circulation device to the pipeline, it can be arranged to separate the pipeline so that the first open end of the pipeline is connected to the first connection part and the second open end of the pipeline is connected to the second connection part, so that the circulation device connects the first open end and the second open end of the pipeline to each other.

[0016] Preferably, the flow path or channel is elongated and extends substantially in a straight line. In particular, it can be provided that the flow path has no bends or curves, for example no 90° bends, so that the main flow direction of the fluid or medium through the flow device is substantially constant.

[0017] The fluid or medium may in particular be a liquid, and the fluid or medium may also have solid components, such as particulate or cellular components. However, the present application is not limited to fluids in liquid form.

[0018] Flow-through devices and / or flow meters are particularly used for monitoring industrial and / or laboratory processes and for monitoring the process based on flow measurement of a fluid or medium flowing through a pipeline, pipe and / or hose system. The flow-through device may be particularly used as a single use (SU) device.

[0019] Preferably, the flow meter can couple an input signal, such as an ultrasonic signal, into the measuring region, preferably via a contact surface of the at least two contact surfaces, and preferably via another contact surface of the at least two contact surfaces, and receive an output signal based on the input signal via the measuring region. Based on the input signal and the output signal, the flow meter can record a measured variable related to the flow measurement, such as a volume flow or a mass flow measurement.

[0020] Preferably, it can be arranged that the at least two contact surfaces comprise elastomers and / or thermoplastic elastomers, wherein optionally, the thermoplastic elastomer is selected, alone or in combination, from the group consisting of polyether block amides (thermoplastic polyether block amides (TPA, thermoplastic polyether block amides)), (co)polyesters (thermoplastic copolyester elastomers (TPC, thermoplastic copolyester elastomers)), polyurethanes (thermoplastic polyurethane elastomers (TPU, thermoplastic polyurethane elastomers)), polyolefins (thermoplastic polyolefins (TPO, thermoplastic polyolefins)), cross-linked thermoplastic elastomers (thermoplastic elastomers made of thermoplastics and vulcanized elastomers (TPV, thermoplastic elastomers made of thermoplastics and vulcanized elastomers)), styrene block copolymers (thermoplastic elastomers based on styrene block copolymers (TPS, thermoplastic elastomers based on styrene block copolymers)) and silicones. According to a preferred embodiment, the at least two contact surfaces comprise styrene block copolymer (TPS).

[0021] Advantageously, the material enables the contact surface to secrete the coupling agent when a contact pressure is exerted on the contact surface by the flow meter.

[0022] According to the present application, the contact surface can be formed as a coating on a substrate or a measuring body. Such a coating can be designed, for example, as an overmolding of the substrate. According to a preferred embodiment, the substrate comprises polybutylene terephthalate. According to the present application, the coating can be solid, porous or sponge-like, with solid embodiments being preferred.

[0023] Preferably, the contact pressure exerted by the flow meter on the contact surface is at least about 0.7 N / mm 2 , preferably at least about 1 N / mm 2 , and particularly preferably at least about 1.3 N / mm 2 Advantageously, the contact pressure allows the contact surface to secrete the coupling agent. In addition, a higher contact pressure may result in a more rapid secretion of the coupling agent. It is not necessary to apply the contact pressure to the entire contact surface(s). In particular, the contact pressure may be applied to the contact surface(s) at points or over portions.

[0024] Furthermore, it may be provided that at least two contact surfaces with the styrene block copolymer have been exposed to gamma or X-ray radiation. Advantageously, gamma or X-ray irradiation enables the necessary contact pressure for secretion of the coupling agent through the contact surfaces to be reduced.

[0025] Preferably, it can be provided that the flow meter has a holder for the measuring area, wherein in the open state of the flow meter, the measuring area can be received by the holder and / or can be removed from the holder, and wherein, in the closed state of the flow meter, the measuring area is surrounded by the flow meter at least in a portion along the flow path. In addition, it can be provided that, in the closed state of the flow meter, the flow meter at least partially applies contact pressure on at least two contact surfaces. In particular, the flow meter can have a sensor, such as an ultrasonic transducer, which is arranged in the holder, wherein the contact pressure is particularly applied to one or more areas of at least two contact surfaces located in the signal path of the sensor. Preferably, the contact pressure can be applied substantially to half of the surface of the at least two contact surfaces. In another preferred embodiment, the contact pressure can be applied substantially to the entire surface of the at least two contact surfaces.

[0026] Preferably, the contact surface can be arranged on the outside of the measuring region, wherein the normal vector of the contact surface preferably extends substantially perpendicularly to the longitudinal axis of the flow device or the main flow direction of the fluid through the flow device. Preferably, the at least two contact surfaces are arranged opposite each other with respect to the flow path.

[0027] Preferably, it can be provided that, in the closed state of the flow meter, the measuring area has an overhang compared to the holder of the flow meter, viewed transversely to the flow path. Advantageously, the overhang of the measuring area means that by closing the flow meter, the holder of the flow meter can exert a corresponding contact pressure on the contact surface. For example, the cross-sectional area of ​​the flow meter holder for the measuring area may be smaller than the cross-sectional area of ​​the measuring area. Alternatively or optionally, the distance between the outer sides of the at least two contact surfaces may be greater than the corresponding distance between the inner sides of the flow meter holder. The overhang may in particular be in the range of 0.5% to 2%, viewed on the cross-sectional area of ​​the measuring area or on the distance between the outer sides of the at least two contact surfaces. Preferably, the overhang may be present over the entire length of the contact surface.

[0028] Preferably, it can be provided that the measuring region has six contact surfaces which extend at least partially along the flow path, wherein the six contact surfaces are arranged relative to one another such that the flow path has a substantially hexagonal cross section, preferably an equilateral hexagonal cross section.

[0029] Preferably, it can be provided that, in the closed state of the flow meter, the holder has a substantially hexagonal cross section, preferably an equilateral hexagonal cross section.In particular, the holder can be designed to be complementary to the measuring area or the contact surface.

[0030] Preferably, it can be provided that the measuring region has a preferably integral measuring body, to which the contact surfaces are attached or arranged. In particular, the measuring body can be coated with the contact surfaces. The measuring body can also have a channel forming part of the flow path. In particular, the measuring body can be completely closed by the contact surfaces, in particular six contact surfaces, at least in the section along the main flow direction. In particular, the contact surfaces can be flat, i.e. the length and width of the contact surfaces are significantly greater than the thickness of the contact surfaces. In particular, the contact surfaces can have a minimum thickness of approximately 1.2 mm and a maximum thickness of approximately 1.5 mm. In addition, the contact surfaces can each have a thickness of approximately 30 mm. 2 Up to 200mm 2 area, preferably about 40 mm 2 Up to 160mm 2 area.

[0031] Preferably, it can be provided that the measuring body is substantially dimensionally stable when a contact pressure is applied. Advantageously, a dimensionally stable design of the measuring body ensures that the measuring body cannot be deformed by the contact pressure and that the contact pressure acting on the contact surface can be maintained. In particular, the measuring body can be made of a thermoplastic material, in particular polybutylene terephthalate (PBT). The measuring body can preferably be manufactured by an injection molding process, for which polybutylene terephthalate is particularly suitable as material for the measuring body.

[0032] Preferably, it can be provided that the coupling agent comprises an external plasticizer and / or extender, which is liquid or liquefied under pressure, wherein optionally, the external plasticizer and / or extender that is liquid or liquefied under pressure is oily. Oiliness refers to an organic liquid that does not mix with water. In particular, the coupling agent can be selected from the group comprising the following listed alone or in combination: bis(2-ethylhexyl)phthalate, mesamoll, mesamoll II, paraffin / mineral oil, polysiloxane or silicone oil. According to a preferred embodiment, white oil or paraffin is extracted or secreted from a thermoplastic elastomer (TPE) according to the present application.

[0033] Preferably, it can be provided that the flow meter has a first housing part and a second housing part, the second housing part being movable relative to the first housing part, and wherein the first housing part and the second housing part together form a holder for the measuring area or measuring body. Preferably, the first housing part and / or the second housing part can have a recess forming the holder.

[0034] The first connection part, the second connection part and the measuring region or the measuring body can be formed as one component, for example as an injection-molded component. Alternatively, it can be provided that the first connection part and the second connection part are detachably connected to the measuring region. The flow-through device can have a fixing element, with which the first connection part and the second connection part can be detachably connected to the measuring region or fixed to the measuring region.

[0035] In addition, the first connection part and the second connection part can be designed so that the pipeline can be fastened to the connection part in a self-locking manner. Thus, the first connection part and the second connection part can each be designed as a hose connector or hose joint to attach the pipeline to the first connection part and / or the second connection part.

[0036] A second aspect relates to a flow-through device for arrangement on a fluid-conducting line and for attaching a flow meter, in particular an ultrasonic flow meter, for detecting a measured variable of a fluid conducted by the line, wherein the flow-through device has:

[0037] a first connection and a second connection, by means of which the flow-through device can be connected to a fluid-conducting line;

[0038] a measuring region, arranged between the first connection and the second connection, the measuring region being connectable to the flow meter for detecting a measured variable, wherein the first connection, the measuring region and the second connection define a flow path for a fluid through the flow-through device,

[0039] - wherein the measuring region has at least two contact surfaces which extend at least partially along the flow path for contacting the flow meter,

[0040] - wherein the at least two contact surfaces are designed to secrete a coupling agent when a contact pressure is applied.

[0041] The flow-through device may also be developed according to the first aspect.

[0042] A third aspect relates to the use of the flow-through device according to the second aspect for detecting a measured variable of a fluid conducted by a fluid conducting line, wherein the following is provided:

[0043] - Arrange the flow device on the pipeline;

[0044] - Attach the flow meter to the measurement area,

[0045] Therein, the flow meter exerts a contact pressure at least on the contact surface due to its attachment to the measuring region.

[0046] Additionally, the use can be provided for flow measurement by means of a flow meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Other features, details and advantages of the present application are obtained from the following description and the accompanying drawings, which show exemplary embodiments of the present application. In all the drawings, corresponding objects or elements have the same reference numerals. In the drawings:

[0048] Figure 1 shows a plan view of a flow-through device for placement on a fluid conducting line and for attachment of a flow meter; and

[0049] Figure 2 A cross-sectional view of a flow-through device is shown. DETAILED DESCRIPTION

[0050] Figure 1 A plan view of a circulation device 10 is shown, and the circulation device 10 is used to be arranged on a fluid guide line (not shown) and to attach a flow meter (not shown). The circulation device 10 has a first connection portion 12 and a second connection portion 14, through which the circulation device 10 can be arranged on the fluid guide line, or between two fluid guide lines. For example, the first connection portion 12 can be connected to a fluid guide line, such as a plastic hose, wherein a fluid or medium can be supplied to the circulation device 10 through the pipeline. In addition, the second connection portion 14 can also be connected to a fluid guide line, and the fluid or medium flows from the circulation device 10 into the fluid guide line via the second connection portion 14. In particular, it can be provided that the fluid is in liquid form, and solid particles such as cell parts can also be present in the fluid. The first connection portion 12 and the second connection portion 14 can each be designed so that the pipeline can be fastened to the connection portions 12, 14 in a self-locking manner. For example, the first connection portion 12 and the second connection portion 14 can each be designed as a hose connector or a hose joint 18.

[0051] Between the first connection 12 and the second connection 14, a measuring region 16 is provided, on which a flow meter (not shown) may be provided, or to which the flow meter may be coupled. The first connection 12, the measuring region 16, and the second connection 14 define a flow path A, through which a fluid or medium may flow through the device 10. The first connection 12, the measuring region 16, and the second connection 14 may in particular form a channel or flow channel 24 defining the flow path A (see Figure 2 ). In particular, the flow path A or the channel 24 can be elongated. Preferably, the flow path A extends substantially in a straight line, so that the main flow direction A of the fluid or medium through the flow device 10 is substantially constant.

[0052] exist Figure 1 In the embodiment shown, the flow device 10 is formed in one piece. However, the flow device 10 may also have a modular structure, wherein the first connection part 12 and the second connection part 14 are each designed as a hollow body and can be detachably connected to the measurement area 16. A fixing element may be provided for fixing or fastening the first connection part 12 or the second connection part 14 to the measurement area 16. For example, each connection part 12, 14 may be attached to the measurement area 16 with a connection nut.

[0053] The measuring region 16 has a measuring body 22, to which at least two contact surfaces 20 are applied or attached, wherein the contact surfaces 20 are oriented outwardly. In particular, the normal vector of each contact surface 20 can be substantially perpendicular to the main flow direction A or to the longitudinal direction of the measuring body 22. In addition, the at least two contact surfaces 20 can extend at least partially along the flow path A or the main flow direction A. Preferably, the contact surfaces 20 are arranged opposite each other with respect to the flow path A and in particular extend parallel to each other. Figure 1 In the embodiment shown, the measuring region 16 has six contact surfaces 20, such as those along the main flow direction A (see Figure 2 ), the six contact surfaces 20 are arranged in a hexagonal shape. In particular, two opposing contact surfaces 20 form a contact surface pair, so that the measuring region 16 has three contact surface pairs. In addition, the measuring body 22 can be integral and / or at least partially close the flow path A along the main flow direction.

[0054] In particular, the flow device 10 can be coupled to a flow meter (not shown). Preferably, it can be provided that the flow meter has a first housing part and a second housing part, the second housing part being movable relative to the first housing part, and wherein the first housing part and the second housing part form a holder to which the measuring region 22 can be coupled. In particular, the first housing part and the second housing part can each have a recess, which together form a holder for the measuring region 16 or the measuring body 22. When the flow meter is closed, the holder of the flow meter contacts the contact surface 20, so that an input signal, for example an ultrasonic signal, can be input into the measuring region 16 via a sensor, for example an ultrasonic transducer, arranged in the holder via the contact surface 20. In addition, the sensor system can receive an output signal based on the input signal via the contact surface 20 and determine a measured variable related to the fluid based on a comparison of the input signal and the output signal.

[0055] Figure 2 Shown along Figure 1 A cross-sectional view of the measuring region 16 taken along the line BB is shown. The measuring region 16 or the measuring body 22 can be designed in particular as an elongated hollow body, the longitudinal axis of which is substantially parallel to the main flow direction A. The measuring body 22 forms part of a channel 24 and thus forms part of a flow path A through which a fluid or medium flows. The channel 24 can also be closed at least in the section along the main flow direction A by the contact surface 20.

[0056] In addition, the flow path A may have a substantially hexagonal cross section in the region of the measurement region 16 or the contact surface 20. However, the present application is not limited to a hexagonal cross section. For example, the cross section of the flow path A in the region of the measurement region 16 or the contact surface 20 may be substantially rectangular, in particular square. For this purpose, the measurement region may have only four contact surfaces 20, which are arranged in a rectangular or square shape when viewed in cross section.

[0057] Furthermore, the contact surface 20 is preferably rectangular, wherein the longitudinal direction of the contact surface 20 extends substantially parallel to a main flow direction A of the fluid or medium through the flow-through device 10 or parallel to the longitudinal direction of the flow-through device 10 .

[0058] The flow meter is designed so that when the flow meter is closed, its retainer, in particular the grooves of the first and second housing parts, exert a contact pressure on the contact surface 20. The contact surface 20 has material properties for releasing or secreting a preferred liquid coupling agent under the contact pressure, which fills the cavity present between the contact surface 20 and the retainer or groove.

[0059] The contact pressure applied by the flow meter on the contact surface may be at least about 0.7 N / mm 2 , preferably at least about 1 N / mm 2 , particularly preferably at least about 1.3 N / mm 2 In particular, a contact pressure can be applied because the measuring region has an overhang compared to the recess when the flow meter is closed. For example, the cross-sectional area of ​​the measuring region 16 transverse to the flow path A can be larger than the cross-sectional area enclosed by the recess or retainer of the flow meter.

[0060] Preferably, the at least two contact surfaces 20 may include elastomers and / or thermoplastic elastomers, wherein optionally, the thermoplastic elastomer is selected from the following groups, alone or in combination: polyether block amides (thermoplastic polyether block amides (TPA, thermoplastic polyether block amides)), (co)polyesters (thermoplastic copolyester elastomers (TPC, thermoplastic copolyester elastomers)), polyurethanes (thermoplastic polyurethane elastomers (TPU, thermoplastic polyurethane elastomers)), polyolefins (thermoplastic polyolefins (TPO, thermoplastic polyolefins)), cross-linked thermoplastic elastomers (thermoplastic elastomers made of thermoplastics and vulcanized elastomers (TPV, thermoplastic elastomers made of thermoplastics and vulcanized elastomers)), styrene block copolymers (thermoplastic elastomers based on styrene block copolymers (TPS, thermoplastic elastomers based on styrene block copolymers)) and silicones. The coupling agent secreted from the contact surface may include an external plasticizer and / or extender, which is liquid or liquefied under pressure. In addition, the liquid or liquefied external plasticizer and / or extender may be oily.

[0061] Preferably, the measuring body 22 can be substantially dimensionally stable when a contact pressure is applied. For example, the measuring body 22 can be made of a thermoplastic material, in particular of polybutylene terephthalate. Advantageously, the dimensionally stable design of the measuring body 22 ensures that the measuring body 22 is not deformed by the contact pressure and that the contact pressure acting on the contact surface 20 can be maintained. The measuring body 22 can preferably be manufactured by an injection molding process, for which polybutylene terephthalate is particularly suitable as a material for the measuring body 22.

[0062] The contact surface 20 may have a length of about 10 mm to 50 mm, as viewed in the longitudinal direction of the flow-through device 10, and a width of about 3 mm to 20 mm, as viewed transversely to the longitudinal direction of the flow-through device 10. In addition, the contact surface 20 may have a minimum thickness of about 1.2 mm and / or a maximum thickness of about 1.5 mm. The distance A1 between two opposing inner sides of the channel 24 may be between 2 mm and 12 mm. In addition, the distance A2 between the outer sides of the two opposing contact surfaces 20 may be between about 6 mm and 35 mm.

[0063] Description of Reference Numerals

[0064] 10 Flow device for arrangement on fluid conducting pipeline

[0065] 12 First connection

[0066] 14 Second connection

[0067] 16 Measurement area

[0068] 18 Hose connector

[0069] 20 Contact surface

[0070] 22 Measurement subject

[0071] 24 channels

[0072] A Main flow direction / longitudinal direction or flow path of the flow device

Claims

1. A system for detecting a measured variable of a fluid guided by a fluid guiding line, the system comprising: - a flow meter, in particular an ultrasonic flow meter, for detecting said measured variable; a flow device (10) for being arranged on the fluid conducting line and for attaching the flow meter to detect a measured variable of the fluid conducted by the line, wherein the flow device has: a first connection (12) and a second connection (14), by means of which the flow-through device (10) can be connected to the fluid-conducting line; a measuring region (16) arranged between the first connection (12) and the second connection (14), the measuring region (16) being connectable to the flow meter for detecting the measured variable, wherein The first connection portion (12), the measuring region (16) and the second connection portion (14) define a flow path (A) for the fluid to pass through the flow device (10), wherein the measuring region (16) has at least two contact surfaces (20), the at least two contact surfaces (20) extending at least partially along the flow path (A) to contact the flow meter, wherein the at least two contact surfaces (20) are designed to secrete a coupling agent when contact pressure is applied, and Therein, the flow meter is designed such that, by coupling the flow meter to the measurement region (16), the flow meter exerts at least the contact pressure on the at least two contact surfaces (20).

2. The system according to claim 1, wherein: The at least two contact surfaces comprise an elastomer and / or a thermoplastic elastomer, wherein, optionally, the thermoplastic elastomer is selected, alone or in combination, from the group consisting of polyether block amides, (co)polyesters, polyurethanes, polyolefins, cross-linked thermoplastic elastomers, styrene block copolymers and silicones.

3. The system according to claim 1 or 2, wherein: The contact pressure is at least about 0.7 N / mm 2 , preferably at least about 1 N / mm 2 , particularly preferably at least about 1.3 N / mm 2 .

4. The system according to claim 1, wherein: The flow meter has a holder for the measuring region (16), wherein, in an open state of the flow meter, the measuring region (16) can be received by the holder and / or can be removed from the holder, and wherein, in a closed state of the flow meter, the measuring region (16) is surrounded by the flow meter at least in a portion along the flow path (A).

5. The system according to claim 4, wherein: In the closed state of the flow meter, viewed transversely to the flow path (A), the measuring region (16) overhangs the holder.

6. A system according to any one of the preceding claims, wherein: The measuring region (16) has six contact surfaces (20) which extend at least in a portion along the flow path (A), wherein the six contact surfaces (20) are arranged relative to one another such that the flow path (A) has a substantially hexagonal cross section, preferably an equilateral hexagonal cross section.

7. A system according to claim 6, when dependent on claim 4 or 5, wherein: The retainer has a substantially hexagonal cross section, preferably an equilateral hexagonal cross section, in the closed state of the flow meter.

8. A system according to any one of the preceding claims, wherein: The measuring region (16) has a preferably integral measuring body (22), to which the contact surface (20) is attached.

9. A system according to any one of the preceding claims, wherein: The measuring body (22) is substantially dimensionally stable under the effect of the contact pressure, and / or wherein the measuring body (22) is made of a thermoplastic material, in particular polybutylene terephthalate.

10. A system according to any one of the preceding claims, wherein: The coupling agent comprises an external plasticizer and / or extender, which is liquid or liquefied under pressure, wherein, optionally, the external plasticizer and / or extender which is liquid or liquefied under pressure is oily.

11. The system according to claim 10, wherein: The coupling agent includes white oil or paraffin.

12. A system according to any preceding claim, when dependent on claim 4, wherein: The flow meter has a first housing part and a second housing part, the second housing part being movable relative to the first housing part, and wherein the first housing part and the second housing part together form the holder for the measuring region (16).

13. A system according to any one of the preceding claims, wherein: The first connection portion (12) and the second connection portion (14) are detachably connected to the measurement region (16).

14. A flow device (10) for arrangement on a fluid conducting line and for attachment of a flow meter, in particular an ultrasonic flow meter, for detecting a measured variable of the fluid conducted by the line, wherein: The circulation device comprises: a first connection (12) and a second connection (14), by means of which the flow-through device (10) can be connected to the fluid-conducting line; a measuring region (16) arranged between the first connection (12) and the second connection (14), the measuring region (16) being connectable to the flow meter for detecting the measured variable, wherein the first connection (12), the measuring region (16) and the second connection (14) define a flow path (A) for the fluid through the flow device (10), wherein the measuring region (16) has at least two contact surfaces (20), the at least two contact surfaces (20) extending at least partially along the flow path to contact the flow meter, Wherein, the at least two contact surfaces (20) are designed to secrete a coupling agent when contact pressure is applied.

15. Use of the flow-through device (10) according to claim 14 for detecting a measured variable of a fluid conducted by a fluid conducting line, wherein the following is provided: - arranging the flow device (10) on the pipeline; - attaching a flow meter to the measurement area (16), wherein the flow meter exerts at least a contact pressure on the contact surface (20) due to the attachment of the flow meter to the measurement area (16).

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