CN112284467A - Electromagnetic flow sensor and method of use - Google Patents
Electromagnetic flow sensor and method of use Download PDFInfo
- Publication number
- CN112284467A CN112284467A CN202011182699.XA CN202011182699A CN112284467A CN 112284467 A CN112284467 A CN 112284467A CN 202011182699 A CN202011182699 A CN 202011182699A CN 112284467 A CN112284467 A CN 112284467A
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000004804 winding Methods 0.000 claims abstract description 30
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 41
- 238000003825 pressing Methods 0.000 claims description 9
- 229920003023 plastic Polymers 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 5
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 5
- 238000001746 injection moulding Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000005253 cladding Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
- G01F1/586—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters constructions of coils, magnetic circuits, accessories therefor
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Volume Flow (AREA)
Abstract
本发明属于液体流量检测领域，公开了一种电磁流量传感器及其使用方法。其中，电磁流量传感器，包括管体、电磁组件、壳体和电极，所述电极安装在所述管体上，所述电磁组件包括线圈绕组和线圈架，所述管体上设置有两个相对的定位部，所述线圈绕组安装在所述线圈架上，每个所述定位部上均固定安装有一个所述线圈架，所述壳体包覆所述管体、电磁组件和电极。提高检测精度。
The invention belongs to the field of liquid flow detection, and discloses an electromagnetic flow sensor and a use method thereof. Wherein, the electromagnetic flow sensor includes a tube body, an electromagnetic assembly, a casing and an electrode, the electrode is mounted on the tube body, the electromagnetic assembly includes a coil winding and a coil frame, and two opposite Each of the positioning parts is fixedly installed with one of the coil frames, and the casing covers the tube body, the electromagnetic assembly and the electrodes. Improve detection accuracy.
Description
Technical Field
The invention belongs to the field of liquid flow detection, and particularly relates to an electromagnetic flow sensor and a using method thereof.
Background
Electromagnetic flow sensors have been widely used, and the advantages of electromagnetic flow sensors mainly include the following aspects. The measurement is not influenced by the temperature, pressure or viscosity of the measured liquid; no pressure loss; continuous measurement can be realized, and the measurement accuracy is high; the caliber range and the measuring range are large, and the measuring range is continuously adjustable; independent of flow velocity distribution, etc. However, there is a problem that, for example, due to a problem of mounting accuracy, a large error is likely to occur in measurement in the same lot and model.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an electromagnetic flow sensor and a using method thereof, so that the detection precision is improved.
The technical scheme is as follows:
electromagnetic flow sensor, including body, electromagnetic component, casing and electrode, the electrode mounting is in on the body, the electromagnetic component includes coil winding and coil former, be provided with the location portion of two mutual symmetries on the body, the coil winding is installed on the coil former, every equal fixed mounting has one in the location portion the coil former, the casing cladding body, electromagnetic component and electrode.
Electromagnetic flow sensor is when the equipment, electromagnetic assembly is as a whole, the coil winding is fixed with the coil former, so coil winding's specification is comparatively unified, the magnetic field that produces when using is also the same basically, the location portion that sets up on the body, can be used for two fixed coil formers, the fixed position of coil former also reaches fixedly, the position of two coil formers reaches fixed back, the magnetic field position and the intensity that coil winding circular telegram produced all realize stably, so little to each electromagnetic flow sensor measuring deviation that produces, the precision of detection also obtains guaranteeing.
The coil frame comprises two parallel plates and a winding shaft clamped in the middle of the plates, and the coil winding is wound on the winding shaft. The coil windings are fixed through the limit between two parallel plates, so that each group of coil windings are kept on one parallel plane.
The electromagnetic assembly further comprises an iron core with a groove in the middle, a through hole is formed in the middle of the coil frame and penetrates through the plate and the shaft, and the positioning part comprises an iron core positioning column and a coil positioning column; the iron core is inserted into the through hole, the groove of the iron core is clamped on the iron core positioning column, and the edge of the plate is fixed on the coil positioning column. The iron core is used for strengthening the magnetism of electro-magnet, and the recess through the iron core cooperatees with the iron core reference column in addition for the rigidity of iron core, because the iron core is promptly of magnetization this moment, so through the iron core location, can be so that the position relatively fixed in magnetic field. And then the plate is fixed on the coil positioning column, and at the moment, the coil winding is also fixed.
And a pressing plate is arranged at one end of the iron core and is used for pressing and holding the coil rack and fixing the coil rack on the coil positioning column through a nail body. After the pressing and holding plate is fixed, the position of the iron core is completely fixed, meanwhile, the coil rack is fixed through the pressing and holding plate, and the coil rack and the position of the iron core are directly related and fixed through the arrangement.
The electrode is provided with threely, be provided with three mounting hole on the body, one of them mounting hole sets up iron core reference column middle part, two in addition the mounting hole round the setting of body, and be located the setting and be in iron core reference column middle part the both sides of mounting hole. The three electrodes are separately arranged, and the mould is convenient to process when injection molding processing is adopted. One of the electrodes is used for grounding and forms a reference point for measurement, so that the measurement error can be reduced.
Specifically, the pipe body is made of plastics, and the electrode and the pipe body are formed by injection molding integrally. Install three electrode together in the mould here, then through moulding plastics, with body and electrode integrated into one piece, the electrode is inlayed on the body this moment, and positioning effect is splendid, has saved the effect of installation moreover, need not to consider the installation accuracy of electrode again when processing the body, and is sealed effectual moreover, can not take place the condition of leaking.
Still include the shield cover, the shield cover cladding is two the outside of electromagnetism subassembly. The shielding cover directly covers the two electromagnetic components, and electromagnetic additional loss and heating are prevented.
Still include temperature sensor, temperature sensor installs on the body, and detect one end and stretch into the inside of body. The temperature sensor is used for detecting the temperature of liquid in the pipe body, and the change value of heat can be measured through the identification of the incoming problem and the outgoing temperature and the flow rate, so that the measurement of the heat of the fluid is completed.
Still include display module, display module installs the casing top, display module includes integrator and display. An integrator is arranged in the display component, and flow or heat information is finally calculated through the imported information of the electrodes and the temperature sensor and is displayed on a display.
The display assembly is characterized by further comprising a rotating connecting ring, one end of the rotating connecting ring is fixedly arranged on the shell, the other end of the rotating connecting ring is connected with the display assembly in a sealing and rotating mode, through holes are formed in the shell, the rotating connecting ring and the display assembly, and the shell, the rotating connecting ring and the through holes in the display assembly are communicated. The rotary connecting ring is rotatably connected with the display assembly, sealing is achieved through the sealing ring, and reading can be checked through rotating the display assembly in different scenes in a rotary mode.
The display assembly is externally provided with a protective shell and a display shell, wherein the protective shell is internally provided with a cavity, the cavity is used for accommodating the integrator, and the display shell is used for displaying readings.
The use method of the electromagnetic flow sensor comprises the following steps:
connecting an electromagnetic flow sensor into a pipeline to be tested;
the electromagnetic assembly is started, and the coil winding is electrified to generate a magnetic field;
the conductive liquid in the tube body flows through the section of the tube body, the magnetic induction line is cut, the electrode induces electromotive force, and an electromotive force signal is output;
and the processing center receives the electromotive force signal and calculates to obtain the liquid flow.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles and effects of the invention.
Unless otherwise specified or defined, the same reference numerals in different figures refer to the same or similar features, and different reference numerals may be used for the same or similar features.
FIG. 1 is an exploded view of an embodiment of the present invention;
FIG. 2 is a schematic perspective view of an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional structural view of an embodiment of the present invention;
FIG. 4 is a schematic view of a fitting structure of a pipe body and a solenoid assembly according to an embodiment of the present invention;
FIG. 5 is an exploded view of the solenoid and solenoid assembly of the present invention;
FIG. 6 is a schematic cross-sectional view of a solenoid assembly and a tubular body according to an embodiment of the present invention;
fig. 7 is a perspective view of a bobbin according to an embodiment of the present invention;
fig. 8 is a schematic perspective view of a tube according to an embodiment of the present invention.
Description of reference numerals:
10. a pipe body; 11. a positioning part; 111. an iron core positioning column; 112. a coil positioning post; 12. mounting holes; 20. an electromagnetic assembly; 21. an iron core; 211. pressing and holding the plate; 22. a bobbin; 221. a plate material; 222. a shaft; 223 a through hole; 30. a housing; 40. an electrode; 50. a shield case; 60. a temperature sensor; 70. a display component; 71. a protective shell; 72. a display housing; 80. rotating the connecting ring; 90. an integrator.
Detailed Description
In order to facilitate an understanding of the invention, specific embodiments thereof will be described in more detail below with reference to the accompanying drawings.
Unless specifically stated or otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In the case of combining the technical solutions of the present invention in a realistic scenario, all technical and scientific terms used herein may also have meanings corresponding to the purpose of achieving the technical solutions of the present invention.
As used herein, unless otherwise specified or defined, "first" and "second" … are used merely for name differentiation and do not denote any particular quantity or order.
As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items, unless specified or otherwise defined.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present; when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present.
As shown in fig. 1 to 5, the electromagnetic flow sensor includes a pipe 10, an electromagnetic assembly 20, a housing 30, and an electrode 40, where the electrode 40 is mounted on the pipe 10, the electromagnetic assembly 20 includes a coil winding and a coil former 22, two mutually symmetrical positioning portions 11 are disposed on the pipe 10, the coil winding is mounted on the coil former 22, one coil former 22 is fixedly mounted on each positioning portion 11, and the housing 30 covers the pipe 10, the electromagnetic assembly 20, and the electrode 40.
When the electromagnetic flow sensor is assembled, the electromagnetic assembly 20 is taken as a whole, the coil windings are fixed by the coil frames 22, so that the specifications of the coil windings are uniform, the magnetic fields generated in use are basically the same, the positioning part 11 arranged on the tube body 10 can be used for fixing the two coil frames 22, the fixed positions of the coil frames 22 are fixed, after the positions of the two coil frames 22 are fixed, the positions and the strength of the magnetic fields generated by electrifying the coil windings are stable, so that the measurement deviation of each manufactured electromagnetic flow sensor is extremely small, and the detection precision is also ensured.
As shown in fig. 5 and 7, the bobbin 22 includes two parallel plates 221 and a bobbin 222 sandwiched between the plates 221, and the coil winding is wound around the bobbin 222. The coil windings are fixed by the spacing between two parallel plates 221, so that each set of coil windings is maintained on one parallel plane.
As shown in fig. 5, 6 and 8, the electromagnetic assembly 20 further includes an iron core 21 having a groove formed in a middle portion thereof, a through hole 223 formed in a middle portion of the coil frame 22, the through hole 223 penetrating through the plate 221 and the shaft 222, and the positioning portion 11 including an iron core positioning post 111 and a coil positioning post 112; the iron core 21 is inserted into the through hole 223, the groove of the iron core 21 is clamped on the iron core positioning column 111, and the edge of the plate 221 is fixed on the coil positioning column 112. The iron core 21 is used for enhancing the magnetism of the electromagnet, and in addition, the groove of the iron core 21 is matched with the iron core positioning column 111, so that the position of the iron core 21 is fixed, at the moment, the magnetized iron core 21 is the iron core 21, and therefore the position of the magnetic field can be relatively fixed through the positioning of the iron core 21. The plate 221 is then secured to the coil positioning posts 112, at which time the coil windings are also secured.
As shown in fig. 5, a pressing plate 211 is disposed at one end of the iron core 21, and the pressing plate 211 presses the coil frame 22 and is fixed on the coil positioning post 112 through a nail. After the holding plate 211 is fixed, the position of the iron core 21 is completely fixed, and at the same time, the coil frame 22 is fixed through the holding plate 211, and the arrangement enables the coil frame 22 and the position of the iron core 21 to be fixed in direct relation.
As shown in fig. 1 and 6, three electrodes 40 are provided, three mounting holes 12 are provided on the tube 10, one of the mounting holes 12 is provided in the middle of the core positioning post 111, and the other two mounting holes 12 are provided around the tube 10 and located at two sides of the mounting hole 12 provided in the middle of the core positioning post 111. The three electrodes 40 are separately arranged, and when injection molding processing is adopted, mold processing is facilitated. One of the electrodes 40 is used for grounding and forms a reference point for measurement, so that the measurement error can be reduced.
Specifically, the tube body 10 is made of plastic, and the electrode 40 and the tube body 10 are integrally formed by injection molding. Here install three electrode 40 together in the mould, then through moulding plastics, with body 10 and electrode 40 integrated into one piece, electrode 40 inlays on body 10 this moment, and the positioning effect is splendid, has saved the effect of installation moreover, need not to consider electrode 40's installation accuracy again when processing body 10, and sealed effectual moreover, the condition of can not taking place to leak.
As shown in fig. 4 and 5, the electromagnetic assembly further includes a shielding case 50, and the shielding case 50 covers the outer sides of the two electromagnetic assemblies 20. The shield 50 directly encloses the two electromagnetic assemblies 20, preventing electromagnetic parasitic losses and heating.
As shown in fig. 1, the temperature sensor 60 is further included, and the temperature sensor 60 is mounted on the pipe body 10, and one end of the temperature sensor extends into the pipe body 10. The temperature sensor 60 is used for detecting the temperature of the liquid in the pipe body 10, and the variation value of the heat can be measured through the identification of the incoming problem and the outgoing temperature and the flow rate, so that the measurement of the heat of the fluid is completed.
As shown in fig. 1, further includes a display assembly 70, the display assembly 70 being mounted above the housing 30, the display assembly 70 including an integrator 90 and a display. The display unit 70 is provided with an integrator 90, and the flow rate or heat amount information is finally calculated from the information introduced from the electrode 40 and the temperature sensor 60 and displayed on the display.
As shown in fig. 1 to 3, the display device further includes a rotation connection ring 80, one end of the rotation connection ring 80 is fixedly installed on the housing 30, and the other end of the rotation connection ring 80 is connected to the display assembly 70 in a sealing and rotating manner, through holes are formed in the housing 30, the rotation connection ring 80 and the display assembly 70, and the through holes in the housing 30, the rotation connection ring 80 and the display assembly 70 are communicated with each other. The rotary connecting ring 80 is rotatably connected with the display assembly 70, sealing is achieved through a sealing ring, and reading can be checked through rotating the display assembly 70 in different scenes in a rotary mode.
As shown in fig. 1, the display module 70 has a protective shell 71 and a display shell 72, wherein the protective shell 71 has a cavity therein, the cavity accommodates an integrator 90, and the display shell 72 is used for displaying readings.
The use method of the electromagnetic flow sensor comprises the following steps:
connecting an electromagnetic flow sensor into a pipeline to be tested;
the electromagnetic assembly 20 is turned on, and the coil winding is electrified to generate a magnetic field;
the conductive liquid in the tube body 10 flows through the cross section of the tube body 10, the magnetic induction line is cut, the electrode 40 induces the electromotive force, and an electromotive force signal is output;
and the processing center receives the electromotive force signal and calculates to obtain the liquid flow.
The processing center of this embodiment is an integrator.
When the drawing description is quoted, the new characteristics are explained; in order to avoid that repeated reference to the drawings results in an insufficiently concise description, the drawings are not referred to one by one in the case of clear description of the already described features.
The above embodiments are provided to illustrate, reproduce and deduce the technical solutions of the present invention, and to fully describe the technical solutions, the objects and the effects of the present invention, so as to make the public more thoroughly and comprehensively understand the disclosure of the present invention, and not to limit the protection scope of the present invention.
The above examples are not intended to be exhaustive of the invention and there may be many other embodiments not listed. Any alterations and modifications without departing from the spirit of the invention are within the scope of the invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011182699.XA CN112284467B (en) | 2020-10-29 | Electromagnetic flow sensor and method of using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011182699.XA CN112284467B (en) | 2020-10-29 | Electromagnetic flow sensor and method of using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112284467A true CN112284467A (en) | 2021-01-29 |
| CN112284467B CN112284467B (en) | 2025-04-11 |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048594A (en) * | 1989-06-16 | 1991-01-16 | 株式会社日立制作所 | Electromagnetic Flowmeter |
| JPH09138145A (en) * | 1995-11-15 | 1997-05-27 | Yamatake Honeywell Co Ltd | Electromagnetic flow meter |
| JP2004233299A (en) * | 2003-01-31 | 2004-08-19 | Aichi Tokei Denki Co Ltd | Electromagnetic flow sensor and electromagnetic flow measuring device |
| CN2670910Y (en) * | 2002-06-21 | 2005-01-12 | 欧姆龙株式会社 | Approach sensor with improving positioning accuracy of testing coil circumferential member |
| JP2005061847A (en) * | 2003-08-12 | 2005-03-10 | Fuji Electric Systems Co Ltd | Electromagnetic flow meter |
| CN201795818U (en) * | 2010-09-27 | 2011-04-13 | 福建上润精密仪器有限公司 | Plug-in type electromagnetic flow meter sensor |
| CN105928573A (en) * | 2016-05-30 | 2016-09-07 | 铜陵市东方矿冶机械有限责任公司 | Insertion type electromagnetic flowmeter |
| CN207751534U (en) * | 2018-01-09 | 2018-08-21 | 江苏恒达自动化仪表有限公司 | A kind of New Electromagnetic Flowmeter |
| CN208350148U (en) * | 2018-01-09 | 2019-01-08 | 江苏省金湖县热工仪表线缆厂有限公司 | A kind of novel pressure display electromagnetic flowmeter |
| CN111344538A (en) * | 2018-11-29 | 2020-06-26 | 深圳市大疆创新科技有限公司 | Electromagnetic flow meter and plant protection unmanned aerial vehicle who has this electromagnetic flow meter |
| CN211346927U (en) * | 2020-07-23 | 2020-08-25 | 潍坊奥博仪表科技发展有限公司 | Electromagnetic flowmeter sensor |
| CN213147946U (en) * | 2020-10-29 | 2021-05-07 | 广州柏诚智能科技有限公司 | Electromagnetic flow sensor |
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048594A (en) * | 1989-06-16 | 1991-01-16 | 株式会社日立制作所 | Electromagnetic Flowmeter |
| JPH09138145A (en) * | 1995-11-15 | 1997-05-27 | Yamatake Honeywell Co Ltd | Electromagnetic flow meter |
| CN2670910Y (en) * | 2002-06-21 | 2005-01-12 | 欧姆龙株式会社 | Approach sensor with improving positioning accuracy of testing coil circumferential member |
| JP2004233299A (en) * | 2003-01-31 | 2004-08-19 | Aichi Tokei Denki Co Ltd | Electromagnetic flow sensor and electromagnetic flow measuring device |
| JP2005061847A (en) * | 2003-08-12 | 2005-03-10 | Fuji Electric Systems Co Ltd | Electromagnetic flow meter |
| CN201795818U (en) * | 2010-09-27 | 2011-04-13 | 福建上润精密仪器有限公司 | Plug-in type electromagnetic flow meter sensor |
| CN105928573A (en) * | 2016-05-30 | 2016-09-07 | 铜陵市东方矿冶机械有限责任公司 | Insertion type electromagnetic flowmeter |
| CN207751534U (en) * | 2018-01-09 | 2018-08-21 | 江苏恒达自动化仪表有限公司 | A kind of New Electromagnetic Flowmeter |
| CN208350148U (en) * | 2018-01-09 | 2019-01-08 | 江苏省金湖县热工仪表线缆厂有限公司 | A kind of novel pressure display electromagnetic flowmeter |
| CN111344538A (en) * | 2018-11-29 | 2020-06-26 | 深圳市大疆创新科技有限公司 | Electromagnetic flow meter and plant protection unmanned aerial vehicle who has this electromagnetic flow meter |
| CN211346927U (en) * | 2020-07-23 | 2020-08-25 | 潍坊奥博仪表科技发展有限公司 | Electromagnetic flowmeter sensor |
| CN213147946U (en) * | 2020-10-29 | 2021-05-07 | 广州柏诚智能科技有限公司 | Electromagnetic flow sensor |
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