CN101067564A - Electromagnetic jat-flow flowmeter - Google Patents
Electromagnetic jat-flow flowmeter Download PDFInfo
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- CN101067564A CN101067564A CN 200710069152 CN200710069152A CN101067564A CN 101067564 A CN101067564 A CN 101067564A CN 200710069152 CN200710069152 CN 200710069152 CN 200710069152 A CN200710069152 A CN 200710069152A CN 101067564 A CN101067564 A CN 101067564A
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Abstract
The invention discloses an electromagnetic jet flow flowmeter. It discloses a resist flow piece installs in the measuring tube of the jet flow flowmeter and a U type electromagnetism structure installs on the measuring tube, the first electrode, the second electrode, the third electrode installs on the measuring tube and resist flow side of the inferior of the U type electromagnetism structure. The U electromagnetism structure is composed by pair of permanent magnet and an exciting coil, controls by monolithic integrated circuit to strengthen or weaken the measuring tube magnetic field. The second electrode connects the grounding of the difference enlarge electric circuit by the wire, the first electrode, the third electrode connect the difference enlarge electric circuit input end by the wire, the difference enlarge electric circuit out-port connect the comparator electric circuit, the monolithic integrated circuit electric circuit in turn. The monolithic integrated circuit electric circuit also provides LCD monitor, pressed key input and so on electric circuit. The entire electric circuit uses a battery power supply. The merit of jet flow flowmeter is that the low power loss, the wide measuring range, the high exempt maintenance, reliable, high accuracy and so on.
Description
Technical field
The present invention relates to flowmeter, relate in particular to a kind of electromagnetic jat-flow flowmeter.
Background technology
Flow metering is an important Scientific Measurement content, and water metering is again one of important contents wherein, plays important effect at aspects such as trade settlement, energy measurement, process control, environmental protection.In recent years along with the global scarcity of the energy and water resource, the startup of priority projects such as the national south water to north, the whole society is more and more higher to the requirement of water metering.Current, water flowmeter mainly contains standard machinery water meter and flowmeter, and mechanical water meter and flowmeter respectively have characteristics.Mechanical water meter is simple in structure with it, quantification stability, cheaply at home and abroad be widely used, and plug and play need not externally fed; Measurement lower limit is low, and this is the technical indicator that general flowmeter is difficult to accomplish.Factors such as transmission resistance, mechanical movable part cause water meter condition of work height, precision is lower, failure rate is higher but mechanical water meter is owing to existing.And the characteristics of flowmeter are opposite with mechanical water meter, almost do not have crushing; Non mechanical movable, the reliability height; Condition of work reduces, and usable range is wider, goes for the metering of middle water even sewage.But flowmeter often needs externally fed, and the lower limit of measurement is not as mechanical water meter.
Can research and develop a kind of new water meter, have the advantage of mechanical water meter and flowmeter simultaneously, avoid the shortcoming of mechanical water meter and flowmeter again.The present invention has adopted a kind of fluidic flowmeter of novel sensing mode.Invention CN1527029, invention CN1587917, invention CN1270667 disclose the different structure of several fluidic flowmeters, improve the lower limit of measurement by the improvement of structure, thereby widen the measurement range.These several inventions do not have to discuss the jet oscillation signal when how to measure low flow velocity, low reynolds number, and this designs the difficult point place of low lower limit fluidic flowmeter exactly.
The frequency of the oscillator signal that fluidic flowmeter produces when low flow velocity, low reynolds number is very low, approximately 0.1HZ.So low signal is easy to be subjected to the influence of pipe vibration, current vibration, and this also is the fatal shortcoming of piezoelectric detection method commonly used.So we have proposed electromechanical detection method.The principle of electromechanical detection method is, in pipeline, produce a stable magnetic field, when water flows through magnetic field, cutting magnetic line, form electromotive force, if the water flow velocity cycle changes, the electromotive force of induction also can change in the cycle, adopt amplifying circuit that this electromotive force faint, that the cycle changes is amplified out, calculate water flow velocity by the period frequency of measuring electromotive force.If we adopt the permanent magnet of high-intensity magnetic field, can produce a defective: foreign material such as iron rust in the easy planar water of magnet.
Summary of the invention
The purpose of this invention is to provide a kind of accurately, reliably, the electromagnetic jat-flow flowmeter of wide-range.The instrument power consumption is extremely low, available powered battery.
Electromagnetic jat-flow flowmeter is in comprising jet base table, testing circuit, a rectangle choked flow piece is installed in the measuring tube of jet base table, a U type electromagnetic structure is installed on measuring tube, below U type electromagnetic structure in the measuring tube, install rectangle choked flow piece one side and first electrode, the third electrode of measuring the tube wall insulation, install and second electrode of measuring the tube wall insulation rectangle choked flow piece another side; The two ends of U type electromagnetic structure are installed the N utmost point, S utmost point permanent magnet respectively, field coil of wrapping in the middle of the U type electromagnetic structure; The annexation of testing circuit is: single-chip microcomputer is connected with driving circuit, LCD display, button input, comparator circuit respectively, driving circuit is connected with field coil in the U type electromagnetic structure, comparator circuit is connected with differential amplifier circuit, and differential amplifier circuit is connected with first electrode, second electrode, third electrode.
The annexation of described driving circuit is: BC0, two signal wires of BC1 are connected to two pins of single-chip microcomputer, BC0 is connected to an end of resistance R 30 and resistance R 31, BC1 is connected to an end of resistance R 32 and resistance R 33, the other end of resistance R 30 and resistance R 31 is connected respectively to triode Q4, the base stage of triode Q3, the other end of resistance R 32 and resistance R 33 is connected respectively to triode Q2, the base stage of triode Q1, triode Q4, the emitter of triode Q2 is linked power supply together, triode Q4, the collector of triode Q2 is connected respectively to triode Q3, the collector of triode Q1, triode Q3, the emitter of triode Q1 is linked ground wire together, triode Q4, the collector of triode Q3 is connected to an end D+ of field coil, triode Q2 together, the collector of triode Q1 is connected to the other end D-of field coil together.
The annexation of described differential amplifier circuit is: second electrode is connected to the ground wire of differential amplifier circuit, first electrode, third electrode is connected with capacitance C1 one end with the capacitance C0 of differential amplifier circuit respectively, the other end of capacitance C0 and capacitance C1 is connected with resistance R 1 one ends with resistance R 0 respectively, the other end of resistance R 0 and resistance R 1 is connected with the positive input of amplifier U0B with amplifier U2B respectively, the positive input of amplifier U2B and amplifier U0B is connected with an end of resistance R 2 and resistance R 3 respectively, the other end of resistance R 2 and resistance R 3 is connected with reference voltage REF, reference voltage REF is connected with the single-chip microcomputer pin, the reverse input end of amplifier U2B and amplifier U0B is connected respectively to an end of resistance R 4 and resistance R 5, the two ends of resistance R m, the other end of resistance R 4 and resistance R 5 is connected respectively to the output terminal of amplifier U2B and amplifier U0B, one end of resistance R 8 and resistance R 9, the other end of resistance R 8 and resistance R 9 is connected respectively to an end of amplifier resistance R 10 and resistance R 11, the forward of amplifier U1B, reverse input end, the other end of resistance R 10 is connected to reference voltage REF2, REF2=VCC/2 wherein, the other end of resistance R 11 is connected to the output terminal of amplifier U1B.
The circular electrode that described first electrode, second electrode, third electrode adopt same conductive to make, be installed in measuring tube top, permanent magnet under, in measuring tube, expose 1～2mm.
Advantage of the present invention:
1) fluidic flowmeter of employing electromechanical detection method, measurement lower limit is low, and is reliable, accurate measurement;
2) to have advantages such as anti-pipe vibration, fluid vibration, electromagnetic radiation strong for electromechanical detection method,
3) electromagnetic structure that adopts field coil and permanent magnet to combine can weaken magnetic field when the big flow velocity of water, can allow current take away the interior contamination of measuring tube like this;
4) electromagnetic structure that adopts field coil and permanent magnet to combine can strengthen magnetic field when the water minimum velocity, thereby the intensity of enhancing signal is widened the lower limit of range;
5) field coil need not switched at ordinary times, and the average working current of complete machine is little, and available powered battery is applicable to that field, wilderness etc. does not have the occasion of civil power.
6) whole flowmeter plug and play is non-maintaining, highly reliable.
Description of drawings
Fig. 1 is the jet base table structural representation of electromagnetic jat-flow flowmeter;
Fig. 2 is a testing circuit structural representation of the present invention;
Fig. 3 is an exciting coil drive circuit of the present invention;
Fig. 4 is a differential amplifier circuit of the present invention;
Fig. 5 is an interface microcontroller circuit diagram of the present invention.
Embodiment
The present invention proposes the electromagnetic structure that field coil and permanent magnet combine.Single-chip microcomputer can be controlled field coil by driving circuit, thus the intensity of controlling magnetic field.During the water flow velocity step-down, the forward drive coil strengthens magnetic field, thus the intensifier electrode signal intensity; When flow velocity uprised, the reverse drive coil weakened magnetic field, allowed current wash away foreign material.Adopt the fluidic flowmeter of this novel sensing mode to have little power consumption, wide-range, advantage such as non-maintaining.
The invention discloses a kind of electromagnetic jat-flow flowmeter.It discloses a choked flow piece has been installed in the measuring tube of fluidic flowmeter, a U type electromagnetic structure is installed on measuring tube, in the measuring tube below U type electromagnetic structure, the side of choked flow piece install two with the electrodes of measuring the tube wall insulation, an electrode that insulate with the measurement tube wall is installed in the back of choked flow piece.Whether U type electromagnetic structure is made up of pair of permanent magnets and a field coil, switched on and positive and negative energising by driving circuit control field coil by single-chip microcomputer, thereby strengthen the interior magnetic field of measuring tube, perhaps weakens the magnetic field in the measuring tube.An electrode of choked flow piece back is connected to the ground wire of differential amplifier circuit by lead, and two electrodes of choked flow piece side are connected to the input end of differential amplifier circuit by lead, and the output terminal of differential amplifier circuit is connected to comparator circuit, single chip circuit successively.Single chip circuit also provides circuit such as LCD display, button input.Entire circuit saves 3.6V or 3.0V powered battery with one.
The course of work of fluidic flowmeter is after water flows into measuring tube, to form vibration at feedback channel 6; When water flow through magnetic field, cutting magnetic line induced electromotive force; The current of vibration induce the cycle electromotive force of vibration; Be drawn out to amplifying circuit with the electrode handle induction electromotive force; For the ease of detecting faint electric signal, adopt 3 electrodes, second electrode, 2 signal ground wires wherein, first electrode 1 and third electrode 3 adopt differential amplifier circuit that electromotive force faint, the cycle variation is amplified out as signal wire; Measure the period frequency of amplifying signal, calculate water flow velocity according to Strouhal equation Sr=f * d/v, wherein Sr is the Strouhal coefficient, and f is an oscillation frequency, and v is the equal flow velocity of level, and d is a coefficient relevant with the measuring tube physical dimension.In view of this, the gordian technique of design fluidic flowmeter is: signal detecting method.In order to make jet flow in respect of wider application scenario, more particularly there is not the place of externally fed, the present invention designs the fluidic flowmeter of low-power consumption, can adopt batteries power supply, so another gordian technique is the testing circuit of design low-power consumption.
As shown in Figure 1, 2, electromagnetic jat-flow flowmeter comprises jet base table, testing circuit, a rectangle choked flow piece 4 is installed in the measuring tube of jet base table, a U type electromagnetic structure 5 is installed on measuring tube, below U type electromagnetic structure in the measuring tube, install rectangle choked flow piece one side and first electrode 1, the third electrode 3 of measuring the tube wall insulation, install and second electrode 2 of measuring the tube wall insulation rectangle choked flow piece another side; The two ends of U type electromagnetic structure are installed the N utmost point, S utmost point permanent magnet respectively, field coil of wrapping in the middle of the U type electromagnetic structure; The annexation of testing circuit is: single-chip microcomputer is connected with driving circuit, LCD display, button input, comparator circuit respectively, driving circuit is connected with field coil in the U type electromagnetic structure, comparator circuit is connected with differential amplifier circuit, and differential amplifier circuit is connected with first electrode, second electrode, third electrode.Whether switch on and positive and negative energising by driving circuit control field coil by single-chip microcomputer, thereby strengthen the interior magnetic field of measuring tube, perhaps weaken the magnetic field in the measuring tube.Entire circuit is by a powered battery.
As shown in Figure 3, the annexation of driving circuit is: BC0, two signal wires of BC1 are connected to two pins of single-chip microcomputer, BC0 is connected to an end of resistance R 30 and resistance R 31, BC1 is connected to an end of resistance R 32 and resistance R 33, the other end of resistance R 30 and resistance R 31 is connected respectively to triode Q4, the base stage of triode Q3, the other end of resistance R 32 and resistance R 33 is connected respectively to triode Q2, the base stage of triode Q1, triode Q4, the emitter of triode Q2 is linked power supply together, triode Q4, the collector of triode Q2 is connected respectively to triode Q3, the collector of triode Q1, triode Q3, the emitter of triode Q1 is linked ground wire together, triode Q4, the collector of triode Q3 is connected to an end D+ of field coil, triode Q2 together, the collector of triode Q1 is connected to the other end D-of field coil together.
Benefit with the electromagnetic structure of controlled coil is: the magnetic field in can the control survey pipe.During no power, whole fluidic flowmeter is in the in service of low-power consumption; During the forward energising, strengthen magnetic field, thereby the intensifier electrode signal intensity reduces measurement lower limit; When oppositely switching on, weaken magnetic field, thereby weaken the absorption affinity in magnetic field, so that current wash away the foreign material that adsorbed by magnetic field.
The present invention adopts electromechanical detection method, testing process is, water moves in magnetic field, cutting magnetic line, because glassware for drinking water has faint electric conductivity, produce electric potential difference on electrode, this is the voltage signal of an alternation, and this signal is connected to differential amplifier circuit, comparator circuit, single chip circuit successively.
As shown in Figure 4, the annexation of differential amplifier circuit is: second electrode is connected to the ground wire of differential amplifier circuit, first electrode, third electrode is connected with capacitance C1 one end with the capacitance C0 of differential amplifier circuit respectively, the other end of capacitance C0 and capacitance C1 is connected with resistance R 1 one ends with resistance R 0 respectively, the other end of resistance R 0 and resistance R 1 is connected with the positive input of amplifier U0B with amplifier U2B respectively, the positive input of amplifier U2B and amplifier U0B is connected with an end of resistance R 2 and resistance R 3 respectively, the other end of resistance R 2 and resistance R 3 is connected with reference voltage REF, reference voltage REF is connected with the single-chip microcomputer pin, the reverse input end of amplifier U2B and amplifier U0B is connected respectively to an end of resistance R 4 and resistance R 5, the two ends of resistance R m, the other end of resistance R 4 and resistance R 5 is connected respectively to the output terminal of amplifier U2B and amplifier U0B, one end of resistance R 8 and resistance R 9, the other end of resistance R 8 and resistance R 9 is connected respectively to an end of amplifier resistance R 10 and resistance R 11, the forward of amplifier U1B, reverse input end, the other end of resistance R 10 is connected to reference voltage REF2, REF2=VCC/2 wherein, the other end of resistance R 11 is connected to the output terminal of amplifier U1B.
In fact, this differential amplifier circuit requires R0=R1, R2=R3, R4=R5, R8=R9=R10=R11; Then output voltage VO UT=VREF2+ (vs1-vs3) * (2 * R4/Rm+1), wherein vs1, vs3 are the signal intensity of two electrodes.Adopt the benefit of differential amplifier circuit to be, the input impedance height, gain is big, and antijamming capability is strong.
The case of an enforcement is VCC=3.6V, REF2=1.8V, R4=510K Ω, Rm=1K Ω, R0=R1=10K Ω, R2=R3=5.1M Ω, R8=R9=R10=R11=510K Ω, C0=C1=10uF.1000 times of the gains of differential amplifier circuit=2 * 510/1+1 ≈.
Above circuit all is connected to single chip circuit, single chip circuit as shown in Figure 5, the present invention adopts the MSP430F4XX series monolithic of American TI Company, is example with MSP430F449, and the realization of micropower circuit is described.In cmos device, power consumption P is directly proportional with system clock frequency f, P ∝ V
2F, wherein V is a supply voltage.The operating voltage of general single-chip microcomputer is constant, so will reduce system clock frequency f as much as possible.Therefore, MSP430F449 only meets low frequency crystal oscillator LFXT1=32.768KHz, does not meet high frequency crystal oscillator XT2.When MSP430F449 needed high-speed cruising, the FLL+ by MSP430F449 provided the radio frequency system clock.The BP0 of MSP430F449, BP1, BP2, BP3, S0, S1, S2 ..., S19 links to each other with segment code type liquid crystal LCD, power consumption only needs several uA.The BC0 of MSP430F449, BC1 link to each other with coil driver.The KEY1 of MSP430F449, KEY2, KEY3, KEY4 link to each other with button.The REF of MSP430F449 links to each other with differential amplifier circuit.
Like this, the course of work of whole fluidic flowmeter is as follows: when water flows through measuring tube, produce vibration.Electromagnetic structure produces a magnetic field that is parallel to electrode, and the water cutting magnetic line because glassware for drinking water has faint electric conductivity, produces an electromotive force on electrode.The water of periodic oscillation will produce an alternating electromotive force E.The frequency F of electromotive force equals oscillation frequency, measures the frequency of electromotive force, also just measured the oscillation frequency F of water, and the mean flow rate V of water is proportional to the oscillation frequency V=KF of water, and wherein K is an instrument coefficient, has so also just measured water flow velocity.Because induction electromotive force is directly proportional with water flow velocity, E=BVd, wherein B is a magnetic field intensity, d is the length of water cutting magnetic line.When water flow velocity V reduced, signal intensity E also reduced, and d fixes, so improve E as long as improve B, promptly single-chip microcomputer forward conduction coil strengthens magnetic field intensity, helps to improve signal intensity.When water flow velocity uprises, even reduce B, can exceedingly not reduce E yet, at this moment, weaken magnetic field, help water to wash away the foreign material such as iron rust that adsorbed by magnetic field.
Claims (4)
1. electromagnetic jat-flow flowmeter, it is characterized in that comprising jet base table, testing circuit, a rectangle choked flow piece (4) is installed in the measuring tube of jet base table, a U type electromagnetic structure (5) is installed on measuring tube, below U type electromagnetic structure in the measuring tube, install rectangle choked flow piece one side and first electrode (1), the third electrode (3) of measuring the tube wall insulation, install and second electrode (2) of measuring the tube wall insulation rectangle choked flow piece another side; The two ends of U type electromagnetic structure are installed the N utmost point, S utmost point permanent magnet respectively, field coil of wrapping in the middle of the U type electromagnetic structure; The annexation of testing circuit is: single-chip microcomputer is connected with driving circuit, LCD display, button input, comparator circuit respectively, driving circuit is connected with field coil in the U type electromagnetic structure, comparator circuit is connected with differential amplifier circuit, and differential amplifier circuit is connected with first electrode, second electrode, third electrode.
2. a kind of tool electromagnetic jat-flow flowmeter according to claim 1, the annexation that it is characterized in that described driving circuit is: BC0, two signal wires of BC1 are connected to two pins of single-chip microcomputer, BC0 is connected to an end of resistance R 30 and resistance R 31, BC1 is connected to an end of resistance R 32 and resistance R 33, the other end of resistance R 30 and resistance R 31 is connected respectively to triode Q4, the base stage of triode Q3, the other end of resistance R 32 and resistance R 33 is connected respectively to triode Q2, the base stage of triode Q1, triode Q4, the emitter of triode Q2 is linked power supply together, triode Q4, the collector of triode Q2 is connected respectively to triode Q3, the collector of triode Q1, triode Q3, the emitter of triode Q1 is linked ground wire together, triode Q4, the collector of triode Q3 is connected to an end D+ of field coil, triode Q2 together, the collector of triode Q1 is connected to the other end D-of field coil together.
3. a kind of electromagnetic jat-flow flowmeter according to claim 1, the annexation that it is characterized in that described differential amplifier circuit is: second electrode is connected to the ground wire of differential amplifier circuit, first electrode, third electrode is connected with capacitance C1 one end with the capacitance C0 of differential amplifier circuit respectively, the other end of capacitance C0 and capacitance C1 is connected with resistance R 1 one ends with resistance R 0 respectively, the other end of resistance R 0 and resistance R 1 is connected with the positive input of amplifier U0B with amplifier U2B respectively, the positive input of amplifier U2B and amplifier U0B is connected with an end of resistance R 2 and resistance R 3 respectively, the other end of resistance R 2 and resistance R 3 is connected with reference voltage REF, reference voltage REF is connected with the single-chip microcomputer pin, the reverse input end of amplifier U2B and amplifier U0B is connected respectively to an end of resistance R 4 and resistance R 5, the two ends of resistance R m, the other end of resistance R 4 and resistance R 5 is connected respectively to the output terminal of amplifier U2B and amplifier U0B, one end of resistance R 8 and resistance R 9, the other end of resistance R 8 and resistance R 9 is connected respectively to an end of amplifier resistance R 10 and resistance R 11, the forward of amplifier U1B, reverse input end, the other end of resistance R 10 is connected to reference voltage REF2, REF2=VCC/2 wherein, the other end of resistance R 11 is connected to the output terminal of amplifier U1B.
4. a kind of electromagnetic jat-flow flowmeter according to claim 1, it is characterized in that the circular electrode that described first electrode, second electrode, third electrode adopt same conductive to make, be installed in measuring tube top, permanent magnet under, in measuring tube, expose 1～2mm.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922953A (en) * | 2010-09-06 | 2010-12-22 | 宁波水表股份有限公司 | Jet flow sensor based on capacitance jet oscillation signal detection method |
| CN102322981A (en) * | 2011-06-08 | 2012-01-18 | 鹤壁市京申科技实业有限公司 | Alternative type electromagnetic jet-flow heat meter and detecting method of same |
| CN105091962A (en) * | 2014-05-20 | 2015-11-25 | 上海怿普仪表有限公司 | Low-power-consumption electromagnetic flow converter |
| CN109443462A (en) * | 2018-12-07 | 2019-03-08 | 杭州为峰智能科技有限公司 | A kind of antimagnetic measuring and testing device |
| CN111623505A (en) * | 2020-05-25 | 2020-09-04 | 太原理工大学 | Self-oscillation jet flow type mixing-increasing heat exchange air outlet device |
| CN111879367A (en) * | 2020-08-03 | 2020-11-03 | 江苏工程职业技术学院 | Electromagnetic flowmeter system and control circuit based on Internet of things |
| CN113551724A (en) * | 2021-06-04 | 2021-10-26 | 宁波水表(集团)股份有限公司 | Flow detection device |
| CN114235063A (en) * | 2021-12-30 | 2022-03-25 | 江苏迅创科技股份有限公司 | Wide-range high-precision electromagnetic flowmeter |
| CN113551724B (en) * | 2021-06-04 | 2024-04-26 | 宁波水表(集团)股份有限公司 | Flow detection device |
-
2007
- 2007-05-31 CN CN 200710069152 patent/CN101067564A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922953A (en) * | 2010-09-06 | 2010-12-22 | 宁波水表股份有限公司 | Jet flow sensor based on capacitance jet oscillation signal detection method |
| CN102322981A (en) * | 2011-06-08 | 2012-01-18 | 鹤壁市京申科技实业有限公司 | Alternative type electromagnetic jet-flow heat meter and detecting method of same |
| CN102322981B (en) * | 2011-06-08 | 2013-08-14 | 鹤壁市京申科技实业有限公司 | Alternative type electromagnetic jet-flow heat meter and detecting method of same |
| CN105091962A (en) * | 2014-05-20 | 2015-11-25 | 上海怿普仪表有限公司 | Low-power-consumption electromagnetic flow converter |
| CN109443462A (en) * | 2018-12-07 | 2019-03-08 | 杭州为峰智能科技有限公司 | A kind of antimagnetic measuring and testing device |
| CN111623505A (en) * | 2020-05-25 | 2020-09-04 | 太原理工大学 | Self-oscillation jet flow type mixing-increasing heat exchange air outlet device |
| CN111623505B (en) * | 2020-05-25 | 2022-03-15 | 太原理工大学 | Self-oscillation jet flow type mixing-increasing heat exchange air outlet device |
| CN111879367A (en) * | 2020-08-03 | 2020-11-03 | 江苏工程职业技术学院 | Electromagnetic flowmeter system and control circuit based on Internet of things |
| CN113551724A (en) * | 2021-06-04 | 2021-10-26 | 宁波水表(集团)股份有限公司 | Flow detection device |
| CN113551724B (en) * | 2021-06-04 | 2024-04-26 | 宁波水表(集团)股份有限公司 | Flow detection device |
| CN114235063A (en) * | 2021-12-30 | 2022-03-25 | 江苏迅创科技股份有限公司 | Wide-range high-precision electromagnetic flowmeter |
| CN114235063B (en) * | 2021-12-30 | 2022-08-05 | 江苏迅创科技股份有限公司 | Wide-range high-precision electromagnetic flowmeter |
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