A gasket-type electromagnetic flow sensor and heat exchanger

Abstract

This invention provides a gasket-type electromagnetic flow sensor and a heat exchanger. The gasket-type electromagnetic flow sensor includes a gasket body and multiple sensing units. The gasket body includes an insulating region with multiple tube holes, which are connected to multiple heat exchange tubes of a tube bundle. Multiple sensing units are respectively disposed within the gasket body and distributed within the insulating region, each corresponding to one of the tube holes. Each sensing unit includes a magnetic field generator and an electrode assembly. The magnetic field generator generates a magnetic field within the tube holes to polarize the liquid medium passing through them. The electrode assembly outputs an induced electromotive force signal based on the polarized liquid medium. This invention can monitor the flow state of the medium within each heat exchange tube of a tube bundle online, quickly locating leaking heat exchange tubes. This not only facilitates accurate monitoring and description of the flow and heat exchange state of the heat exchanger but also provides guidance for operations such as tube plugging when tube-side leaks occur.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, and more particularly to a gasket-type electromagnetic flow sensor and heat exchanger. Background Technology

[0002] Heat exchangers often contain large-scale tube bundles, and the flow state of the medium within these bundles is crucial to the overall system operation. However, existing measurement techniques cannot monitor the flow state of the medium within the tube bundles online, making it impossible to perform refined modeling of the tube bundle equipment based on its flow parameters to predict system performance.

[0003] In actual operation, tube bundles are susceptible to vibration, fatigue, corrosion, wear, water hammer, and other factors, leading to damage to one or more heat exchange tubes and resulting in leakage of the heat exchange medium on the shell or tube side of the heat exchanger. In cases where the heat exchanger is a gas-liquid heat exchanger or a liquid-liquid heat exchanger with a pressure difference between the tube and shell sides, limitations such as the installation environment and the usage scenarios of the heat exchange medium inside and outside the tube bundle make it difficult to detect leaks promptly and effectively, and also make it impossible to locate the leaking heat exchange tube. This hinders guidance for engineering operations such as tube plugging. In cases of severe leakage, it is necessary to shut down the heat exchange equipment, or even the entire system, for offline maintenance of the entire heat exchanger tube bundle. This is not only time-consuming and labor-intensive, but also severely impacts the economic efficiency of the equipment system. Summary of the Invention

[0004] This invention provides a gasket-type electromagnetic flow sensor and heat exchanger to solve or improve the current problem of difficulty in online monitoring of the flow state of the medium inside the tube bundle of a heat exchanger.

[0005] This invention provides a gasket-type electromagnetic flow sensor, comprising: a gasket body and a plurality of sensing units; the gasket body includes an insulating region, the insulating region having a plurality of tube holes, the plurality of tube holes being used to communicate one-to-one with a plurality of heat exchange tubes in a tube bundle; the plurality of sensing units are respectively disposed within the gasket body and distributed in the insulating region; the plurality of sensing units are one-to-one with the plurality of tube holes; each sensing unit includes a magnetic field generating device and an electrode assembly; the magnetic field generating device is used to generate a magnetic field within the tube holes to polarize the liquid medium passing through the tube holes; the electrode assembly is used to output an induced electromotive force signal based on the polarized liquid medium.

[0006] According to a gasket-type electromagnetic flow sensor provided by the present invention, the magnetic field generating device and the electrode assembly are respectively disposed on the wall of the pipe hole, and the magnetic field generating device and the electrode assembly are arranged along the circumference of the pipe hole.

[0007] According to the present invention, a gasket-type electromagnetic flow sensor is provided, wherein the magnetic field generating device includes a first excitation coil and a second excitation coil, the first excitation coil and the second excitation coil being disposed on opposite sides of the pipe hole.

[0008] According to a gasket-type electromagnetic flow sensor provided by the present invention, the electrode assembly includes an anode plate and a cathode plate, the anode plate and the cathode plate being disposed on opposite sides of the pipe hole.

[0009] According to a gasket-type electromagnetic flow sensor provided by the present invention, the sensing and detection unit further includes a power supply structure and a control module; the magnetic field generating device and the electrode assembly are electrically connected to one end of the power supply structure, and the other end of the power supply structure is electrically connected to the control module; the control module includes an electron supply unit, a control subunit, and a data acquisition subunit; the control subunit is connected to the electron supply unit and the data acquisition subunit respectively; the control subunit is used to control the electron supply unit to supply excitation current to the magnetic field generating device, and to control the data acquisition subunit to acquire the induced electromotive force signal.

[0010] According to the present invention, a gasket-type electromagnetic flow sensor is provided, wherein the insulating region includes a detection layer, a power supply layer, and a control layer; the detection layer, the power supply layer, and the control layer are sequentially connected along the axial direction of the pipe hole; a magnetic field generating device and an electrode assembly are respectively disposed on the detection layer; a power supply structure is disposed on the power supply layer, and a control module is disposed on the control layer; wherein the power supply structure includes a first power supply line and a second power supply line, the magnetic field generating device is electrically connected to one end of the first power supply line, the electrode assembly is electrically connected to one end of the second power supply line, and the other ends of the first power supply line and the other ends of the second power supply line are respectively electrically connected to the control module.

[0011] According to the present invention, a gasket-type electromagnetic flow sensor is provided, wherein the sensing and detection unit includes a shielding ring; the power supply structure includes a third power supply line; the magnetic field generating device, the electrode assembly, and the tube hole are respectively disposed within the area defined by the shielding ring; the shielding ring is disposed on the detection layer, the shielding ring is electrically connected to one end of the third power supply line, and the other end of the third power supply line is electrically connected to the grounding terminal on the control module.

[0012] According to the present invention, a gasket-type electromagnetic flow sensor is provided, wherein the insulating region includes a first base material layer and a second base material layer; the first base material layer is disposed on the side of the detection layer away from the feed layer, and the second base material layer is disposed on the side of the control layer away from the feed layer.

[0013] According to a gasket-type electromagnetic flow sensor provided by the present invention, the gasket body further includes an installation area; the installation area extends circumferentially along the insulating area and forms a ring; a bus interface is provided on the side of the installation area, and the control module of the sensing and detection unit is electrically connected to the bus interface.

[0014] The present invention also provides a heat exchanger, including a first end cap, a tube bundle and a second end cap, and further including a gasket-type electromagnetic flow sensor as described in any of the preceding claims; the gasket-type electromagnetic flow sensor is provided in two, one of which is disposed between the first end cap and one end of the tube bundle, and the other of which is disposed between the other end of the tube bundle and the second end cap.

[0015] This invention provides a gasket-type electromagnetic flow sensor and heat exchanger. When detecting the flow state of liquid media within the tube bundle of a heat exchanger, the gasket-type electromagnetic flow sensor is suitable for installation at both ends of the tube bundle. Since each hole on the gasket body is connected to each heat exchange tube in the tube bundle, the inlet and outlet flow rates through the corresponding heat exchange tube can be detected online based on the sensing and detection unit located in each hole. This allows for the determination of whether the tube bundle is intact and enables rapid location of leaking heat exchange tubes within the tube bundle. This not only facilitates accurate monitoring and description of the flow and heat exchange state of the heat exchanger but also provides guidance for subsequent engineering measures such as tube plugging when tube-side leakage occurs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a top view schematic diagram of the gasket-type electromagnetic flow sensor provided by the present invention;

[0018] Figure 2 This invention provides Figure 1 A schematic diagram of the AA cross-sectional structure;

[0019] Figure 3 This invention provides Figure 1 A magnified schematic diagram of the local structure at point K1;

[0020] Figure 4 This invention provides Figure 2 A magnified schematic diagram of the local structure at point K2;

[0021] Figure 5This is a schematic diagram of the heat exchanger provided by the present invention;

[0022] Figure 6 This is a schematic diagram of the structure provided by the present invention for detecting the flow state of liquid medium inside the tube bundle of a heat exchanger;

[0023] Figure label:

[0024] 100: Gasket-type electromagnetic flow sensor; 200: Heat exchanger; 300: Data acquisition instrument; 400: Remote terminal processor; 11: Insulation area; 12: Installation area; 13: Bus interface; 14: Pipe hole; 111: First base material layer; 112: Detection layer; 113: Power supply layer; 114: Control layer; 115: Second base material layer; 101: Magnetic field generating device; 102: Electrode assembly; 103: Shielding ring; 121: First power supply line; 122: Second power supply line; 123: Third power supply line; 131: Control module; 21: First end cap; 22: Tube bundle; 23: Second end cap. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0026] The following is combined Figures 1-6 This invention describes a gasket-type electromagnetic flow sensor and heat exchanger.

[0027] like Figures 1 to 4 As shown, this embodiment provides a gasket-type electromagnetic flow sensor 100, which includes: a gasket body and multiple sensing units; the gasket body includes an insulating region 11, the insulating region 11 is provided with multiple tube holes 14, the multiple tube holes 14 are used to communicate one-to-one with multiple heat exchange tubes in the tube bundle of a heat exchanger; the multiple sensing units are respectively disposed in the gasket body and distributed in the insulating region 11; the multiple sensing units are one-to-one with the multiple tube holes 14; the sensing units include a magnetic field generating device 101 and an electrode assembly 102; the magnetic field generating device 101 is used to generate a magnetic field in the tube hole 14 to polarize the liquid medium passing through the tube hole 14; the electrode assembly 102 is used to output an induced electromotive force signal based on the polarized liquid medium.

[0028] Specifically, in this embodiment, when detecting the flow state of the liquid medium inside the tube bundle of the heat exchanger, it is suitable to install a gasket-type electromagnetic flow sensor 100 at both ends of the tube bundle of the heat exchanger. Since each tube hole 14 on the gasket body is connected to each heat exchange tube in the tube bundle, the inlet and outlet flow rates through the corresponding heat exchange tubes can be detected online based on the sensing and detection unit provided in each tube hole 14, so as to determine whether the tube bundle is intact and to quickly locate the heat exchange tube in the tube bundle that has leaked. This not only facilitates accurate monitoring and description of the flow and heat exchange state of the heat exchanger, but also provides guidance for subsequent engineering measures such as tube plugging when tube-side leakage occurs.

[0029] It should be noted that the material of the insulating region 11 shown in this embodiment can be selected from engineering plastics or ceramics such as polyether ether ketone (PEEK), Teflon (PTFE), and polyimide (PI), and should ensure that the insulating region 11 can withstand the high temperature requirements of most liquid fluids.

[0030] In this embodiment, by selecting to set the sensing and detection unit in the insulating region 11, the non-magnetic nature of the insulating region 11 is utilized to achieve accurate detection of the flow rate of the liquid medium passing through each heat exchange tube based on electromagnetic detection.

[0031] To facilitate the fixed installation of the gasket body, the gasket body shown in this embodiment also includes an installation area 12; the installation area 12 extends circumferentially along the insulation area 11 and forms a ring shape.

[0032] In this embodiment, the installation area 12 can be made of metal, and the material of the installation area 12 is the same as that of the heat exchanger shell, so as to ensure the sealing and stability of the installation structure after the gasket-type electromagnetic flow sensor 100 is installed.

[0033] In this embodiment, the insulating region 11 and the mounting region 12 can be integrally formed using a molding process. For example, if the insulating region 11 is made of engineering plastic, the insulating region 11 and the mounting region 12 can be integrally formed using an injection molding process.

[0034] In some embodiments, in order to facilitate accurate detection of the flow rate of the liquid medium passing through the heat exchange tube, the magnetic field generating device 101 and the electrode assembly 102 are respectively disposed on the wall of the tube hole 14, and the magnetic field generating device 101 and the electrode assembly 102 are arranged along the circumference of the tube hole 14.

[0035] Specifically, the magnetic field generating device 101 shown in this embodiment includes a first excitation coil and a second excitation coil. In this embodiment, the first excitation coil and the second excitation coil can be coupled along the magnetic field generating device 101. Figure 3 The magnetic field lines are arranged horizontally on opposite sides of the tube hole 14 to form a magnetic field with horizontally distributed magnetic field lines between the first excitation coil and the second excitation coil.

[0036] In this embodiment, the first excitation coil and the second excitation coil are electrically isolated from each other and powered independently to ensure that the magnetic field formed by the first excitation coil and the second excitation coil can be distributed within the area where the orifice 14 is located, thereby polarizing the liquid medium passing through the orifice 14. The liquid medium in this embodiment is a liquid conductive medium, for example, water.

[0037] Specifically, in this embodiment, pulsed alternating current, sawtooth alternating current, or sinusoidal alternating current can be supplied to the first excitation coil and the second excitation coil to form an alternating magnetic field in the region between the first excitation coil and the second excitation coil.

[0038] Furthermore, the electrode assembly 102 shown in this embodiment includes an anode plate and a cathode plate, and the anode plate and cathode plate are arranged along the following... Figure 3 The vertical directions shown are located on opposite sides of the pipe hole 14.

[0039] Specifically, after the liquid medium inside the orifice 14 is polarized, a large number of positive and negative ions (electrons) are formed. Under the influence of the magnetic field, the positive and negative ions accumulate on the anode and cathode plates, respectively, thereby creating an induced potential between the anode and cathode plates. Since the induced potential between the anode and cathode plates will exhibit different changes under different flow rates, this embodiment can calculate the flow rate of the liquid medium passing through the orifice 14 by detecting the induced potential signals output by the anode and cathode plates.

[0040] Based on the scheme shown in the above embodiments, in order to facilitate the detection and control of the flow rate of the liquid medium, the sensing and detection unit shown in this embodiment further includes a power supply structure and a control module 131; the magnetic field generating device 101 and the electrode assembly 102 are electrically connected to one end of the power supply structure, and the other end of the power supply structure is electrically connected to the control module 131.

[0041] Here, the control module 131 includes an electron supply unit, a control subunit, and a data acquisition subunit; the control subunit is connected to the electron supply unit and the data acquisition subunit respectively; the control subunit is used to control the electron supply unit to supply excitation current to the magnetic field generator 101, and to control the data acquisition subunit to acquire the induced electromotive force signal generated on the electrode assembly 102.

[0042] In this embodiment, the electron supply unit is used to supply alternating current to the magnetic field generator 101 and control the type, frequency, amplitude, and other parameters of the given alternating current. The control subunit in this embodiment is used to control the acquisition subunit's acquisition time of the induced electromotive force signal. The acquisition subunit processes the acquired induced electromotive force signal and converts it into an electrical signal that can be recognized by the controller.

[0043] In some embodiments, in order to facilitate the measurement and control of the sensing and detection units, this embodiment refers to the principle of CMOS array signal acquisition and designs an array-type sub-module control. The circuit elements of the insulating area 11 of the gasket body are arranged in an embedded layer to achieve a reasonable arrangement of power supply, control, shielding and signal acquisition of the sensing and detection units, so as to integrate multiple sensing and detection units on the gasket body and meet the measurement and control requirements of multiple sensing and detection units.

[0044] like Figure 2 and Figure 4 As shown, the insulating region 11 in this embodiment includes a detection layer 112, a power supply layer 113, and a control layer 114; the detection layer 112, the power supply layer 113, and the control layer 114 are connected sequentially along the axial direction of the borehole 14.

[0045] Specifically, in this embodiment, the magnetic field generating device 101 and the electrode assembly 102 are respectively disposed on the detection layer 112; the power supply structure is disposed on the power supply layer 113, and the control module 131 is disposed on the control layer 114. The power supply structure includes a first power supply line 121 and a second power supply line 122. The magnetic field generating device 101 is electrically connected to one end of the first power supply line 121, and the electrode assembly 102 is electrically connected to one end of the second power supply line 122. The other ends of the first power supply line 121 and the second power supply line 122 are respectively electrically connected to the control module 131.

[0046] Meanwhile, the sensing and detection unit shown in this embodiment includes a shielding ring 103; the power supply structure includes a third power supply line 123; and the magnetic field generating device 101, electrode assembly 102, and tube hole 14 are respectively disposed within the area defined by the shielding ring 103. Thus, based on the shielding ring 103, this embodiment ensures that there is no mutual interference between detection signals when multiple sensing and detection units are performing detection simultaneously.

[0047] In this embodiment, the shielding ring 103 is disposed on the detection layer 112. The shielding ring 103 can be a cylindrical metal wire mesh or a metal ring known in the art. In this embodiment, the shielding ring 103 can be electrically connected to one end of the third feed line 123, and the other end of the third feed line 123 can be electrically connected to the grounding terminal on the control module 131.

[0048] It should be noted that the first feed line 121, the second feed line 122 and the third feed line 123 shown in this embodiment can all be metal wires with conductive properties known in the art. For example, the metal wires can be copper wires, gold wires, silver wires, etc., and no specific limitation is made here.

[0049] like Figure 4 As shown, the insulating region 11 in this embodiment includes a first base material layer 111 and a second base material layer 115; the first base material layer 111 is disposed on the side of the detection layer 112 away from the power supply layer 113, and the second base material layer 115 is disposed on the side of the control layer 114 away from the power supply layer 113.

[0050] In this embodiment, the design based on the first base material layer 111 and the second base material layer 115 ensures that the magnetic field generating device 101 and the electrode assembly 102 are far away from the inlet and outlet sides of the tube hole 14. This design can, to a certain extent, avoid the influence of the inlet and outlet effects of the liquid fluid on the flow measurement, thereby improving measurement accuracy.

[0051] Based on the scheme shown in the above embodiments, this embodiment can provide a bus interface 13 on the side of the installation area 12. Here, this embodiment can adaptively set multiple bus interfaces 13 according to actual signal transmission requirements, and electrically connect the control module 131 of the sensing and detection unit to the bus interface 13.

[0052] In this embodiment, the bus interface 13 is a pin-type interface. Some of the pins in the pin-type interface are used to meet the power supply requirements, and the other part of the pins in the pin-type interface are used to meet the electrical signal transmission requirements.

[0053] like Figure 5 and Figure 6 As shown, this embodiment also provides a heat exchanger 200, which includes a first end cap 21, a tube bundle 22, a second end cap 23, and a gasket-type electromagnetic flow sensor 100 as described in any of the preceding claims.

[0054] In this embodiment, two gasket-type electromagnetic flow sensors 100 are provided. One gasket-type electromagnetic flow sensor 100 is located between the first end cap 21 and one end of the tube bundle 22, and the other gasket-type electromagnetic flow sensor 100 is located between the other end of the tube bundle 22 and the second end cap 23.

[0055] In this embodiment, the heat exchanger 200 can be a cylindrical shell-and-tube heat exchanger. In this embodiment, the mounting area 12 of one gasket-type electromagnetic flow sensor 100 is fixed between the port of the first end cap 21 and the tube sheet at one end of the tube bundle 22, and the mounting area 12 of the other gasket-type electromagnetic flow sensor 100 is fixed between the port of the second end cap 23 and the tube sheet at the other end of the tube bundle 22.

[0056] exist Figure 5 and Figure 6 In this embodiment, arrows specifically illustrate the flow direction of the liquid medium on the tube side and the flow direction of the gaseous medium on the shell side. Clearly, after the liquid medium enters the cavity containing the first end cap 21, it first enters the heat exchange tube corresponding to the tube hole 14 on the left side of the gasket body, then flows out from the tube hole 14 on the right side of the gasket body, and finally flows out of the heat exchanger from the second end cap 23. Obviously, this embodiment can determine the leakage status of the heat exchange tube by detecting the flow rate of the liquid medium entering and exiting the same heat exchange tube.

[0057] In actual testing, in this embodiment, two gasket-type electromagnetic flow sensors 100 can be connected to an external data acquisition instrument 300 through their respective bus interfaces 13. The data acquisition instrument 300 transmits the data to a remote terminal processor 400, which then performs signal processing and analysis.

[0058] Since the number of heat exchange tubes contained in the tube bundle 22 within the heat exchanger 200 is typically in the thousands, it is difficult to simultaneously and synchronously measure and transmit signals from the sensing and detection units corresponding to multiple heat exchange tubes. Therefore, this embodiment can set a timing sequence for inspecting each heat exchange tube in the tube bundle 22, performing traversal measurements on the sensing and detection units in the two gasket-type electromagnetic flow sensors 100 corresponding to the same heat exchange tube. By collecting, calibrating, and correcting the flow signals at the inlet and outlet of the heat exchange tubes, the flow distribution data of the tube bundle 22 can be obtained. Then, by further comparing the difference between the two values ​​and combining the heat exchanger operating status parameters, it can be determined whether a leak has occurred in the corresponding heat exchange tube.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A spool-type electromagnetic flow sensor, characterized by, The gasket body is provided with a plurality of sensing and detecting units. The gasket body comprises an insulating region provided with a plurality of tube holes for one-to-one communication with a plurality of heat exchange tubes in a tube bundle. The plurality of sensing and detecting units are respectively arranged in the gasket body and distributed in the insulating region; the plurality of sensing and detecting units are one-to-one opposite to the plurality of tube holes; the sensing and detecting unit comprises a magnetic field generating device and an electrode assembly. The magnetic field generating device is used to generate a magnetic field in the tube hole to polarize the liquid medium passing through the tube hole; the electrode assembly is used to output an induced potential signal based on the polarized liquid medium. The sensing and detecting unit further comprises a power supply structure and a control module. The magnetic field generating device and the electrode assembly are respectively electrically connected to one end of the power supply structure, and the other end of the power supply structure is electrically connected to the control module. The insulating region comprises a detection layer, a power supply layer and a control layer; the detection layer, the power supply layer and the control layer are sequentially connected along the axial direction of the tube hole; the magnetic field generating device and the electrode assembly are respectively arranged in the detection layer; the power supply structure is arranged in the power supply layer, and the control module is arranged in the control layer; the gasket body is further provided with a bus interface, and the control module of the sensing and detecting unit is electrically connected to the bus interface. The magnetic field generating device and the electrode assembly are respectively arranged on the hole wall of the tube hole, and the magnetic field generating device and the electrode assembly are arranged along the circumferential direction of the tube hole. The control module comprises a current supply unit, a control subunit and an acquisition subunit; the control subunit is connected to the current supply unit and the acquisition subunit; the control subunit is used to control the current supply unit to deliver excitation current to the magnetic field generating device, and control the acquisition subunit to collect the induced potential signal. The power supply structure comprises a first power supply line and a second power supply line; one end of the first power supply line is electrically connected to the magnetic field generating device, one end of the second power supply line is electrically connected to the electrode assembly, and the other end of the first power supply line and the other end of the second power supply line are respectively electrically connected to the control module. The sensing and detecting unit comprises a shielding ring; the power supply structure comprises a third power supply line; the magnetic field generating device, the electrode assembly and the tube hole are respectively arranged in the region defined by the shielding ring. The shielding ring is arranged in the detection layer; the shielding ring is electrically connected to one end of the third power supply line, and the other end of the third power supply line is electrically connected to the ground end on the control module.

2. The gasket type electromagnetic flow sensor according to claim 1, wherein the magnetic field generating device comprises a first excitation coil and a second excitation coil, and the first excitation coil and the second excitation coil are respectively arranged on opposite sides of the tube hole.

3. The gasket type electromagnetic flow sensor according to claim 1, wherein the electrode assembly comprises an anode sheet and a cathode sheet, and the anode sheet and the cathode sheet are respectively arranged on opposite sides of the tube hole. ​ ​ ​ 4. The gasketed electromagnetic flow sensor of claim 1, wherein: the insulating region comprises a first base material layer and a second base material layer; the first base material layer is disposed on a side of the sensing layer distal to the feed layer, and the second base material layer is disposed on a side of the control layer distal to the feed layer.

5. The gasketed electromagnetic flow sensor of claim 1, wherein: the gasket body further comprises a mounting region; the mounting region extends circumferentially along the insulating region and forms a ring shape; and a side of the mounting region is provided with the bus interface.

6. A heat exchanger comprising a first head, a tube bundle and a second head, characterised in that, The gasketed electromagnetic flow sensor of any one of claims 1-5. The gasketed electromagnetic flow sensor is provided with two, one of which is disposed between the first head and one end of the tube bundle, and the other is disposed between the other end of the tube bundle and the second head.

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