What is the measuring principle of an electromagnetic flowmeter?

Here are some of the well-known brands recognized in the flowmeter industry that are widely recognized and have a great reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional institutions or market research data for more detailed and accurate information.

E+H Electromagnetic Flowmeter Measuring Principle.

Advantages and disadvantages of hke electromagnetic flowmeter

There are two sides to everything, there must be advantages and disadvantages, and there must be good and bad. The same goes for the HKE electromagnetic flowmeter. Understanding the advantages and disadvantages of HKE electromagnetic flowmeter helps to fully understand HKE electromagnetic flowmeter, which is very beneficial to its application.

Advantages of hke electromagnetic flowmeter

1) The output of the electromagnetic flowmeter is only proportional to the average flow velocity of the measured medium, and has nothing to do with the flow state (laminar flow or turbulent flow) under the symmetrical distribution, so the range of the electromagnetic flowmeter is extremely wide, and its measurement range can reach 100:1, and some even reach the operating flow range of 1000:1.

2) Compared with most other flow meters, there are no obstructed flow parts in the measuring tube of the electromagnetic flowmeter, and the requirements for the front straight pipe section are relatively low.

3) The sensor structure of the electromagnetic flowmeter is simple, and there are no throttling parts in the measuring tube, nor are there any throttling parts that hinder the flow of fluid. Therefore, when the fluid passes through the flow meter, it does not cause any additional pressure loss and is one of the flow meters with low energy consumption in operation.

4) The electromagnetic flowmeter has no mechanical inertia and has a relatively sensitive responsiveness, which can measure the instantaneous pulsating flow rate, and can also measure the flow rate in both positive and negative directions.

5) It can measure the flow medium of dirty, corrosive and suspended liquid-solid two-phase flow. This is due to the fact that there are no obstructed flow parts inside the measuring tube of the instrument, and only the inner lining and the electrodes of the measuring tube are in contact with the measured flow rate. Because the flow rates measured are different, the materials required also have different performance requirements (see "Selection of Electromagnetic Flowmeter Lining Materials" above).

6) Electromagnetic flowmeter is a kind of volumetric flow measurement instrument, in the measurement process, it is not affected by the temperature, viscosity, density and conductivity (within a certain range) of the measured medium. Therefore, the electromagnetic flowmeter can safely measure the flow rate of other conductive liquids by simply calibrating the water.

Disadvantages of HKE electromagnetic flowmeter

1) Do not measure gases, vapors, or liquids containing large amounts of gas.

2) It cannot be used to measure liquid media with very low conductivity or non-conductivity, such as petroleum products or organic solvents and other media, and the electromagnetic flowmeter is not yet powerless.

3) It will be affected by the strong magnetic field around it.

Through the above summary, we also have a certain understanding of the characteristics of the electromagnetic flowmeter, although the electromagnetic flowmeter is now widely used, but it still has its own disadvantages, there are limitations, Xiamen Hongkong automation instrument **** adhering to the spirit of innovation, with a number of excellent technicians and other staff, I believe that there will be a breakthrough development in the near future.

Electromagnetic flowmeter is a kind of flow measurement instrument, which is mainly used for the measurement of clean water, sewage, domestic water, raw water, various acids, alkalis, salts and other solutions, mud, mineral pulp, pulp and food liquids. Its main features are as follows.

First: the sensor structure of the electromagnetic flowmeter is relatively simple, and it is one of the flow meters with the lowest energy consumption in the flowmeter. There are no moving parts and throttling parts that impede the flow of fluid in the measuring tube, and no additional pressure loss is caused when the fluid passes through the flow meter;

Second, it can measure the flow rate of corrosive media, dirty media and suspended liquid-solid two-phase flow. This is due to the fact that there are no obstructed flow parts inside the measuring tube of the instrument, and only the inner lining and electrode of the measuring tube are in contact with the measured fluid, and the material can be selected according to the properties of the measured fluid;

Third: electromagnetic flowmeter is a kind of volumetric flow measurement instrument, in the measurement process, it is not affected by the temperature, viscosity, density and conductivity of a certain range of the measured medium. The electromagnetic flowmeter only needs to be calibrated by water, and can be used to measure the flow rate of other conductive liquids;

Fourth: The output of the electromagnetic flowmeter is only proportional to the average flow velocity of the measured medium, and has nothing to do with the laminar or turbulent flow state under the symmetrical distribution.

The measurement accuracy of the electromagnetic flowmeter is not affected by the changes in fluid density, viscosity, temperature, pressure and conductivity, and the sensor induces a linear relationship between the voltage signal and the flow rate, so the measurement accuracy is high. The electromagnetic flowmeter measures the pipe without obstruction parts, so there is no pressure loss, and the electromagnetic flowmeter measures that there are no moving parts in the pipe, so it has an extremely long life. Only the inner lining and electrodes of the electromagnetic flowmeter sensor are in contact with the measured liquid, so as long as the electrodes and lining materials are reasonably selected, they can resist corrosion and wear.

The measuring principle of the electromagnetic flowmeter is based on the law of electromagnetic induction. Its sensor part is composed of coil, electrode and insulating lining, the excitation coil in the sensor is energized to produce a magnetic field during measurement, when the conductive body hand branch passes through the magnetic field, due to the force of cutting the magnetic field line, a tiny induced electromotive force is generated, these tiny induced electromotive forces are collected by the electrode, and transported to the converter part of the instrument, the signal is amplified, corrected and other operations, and then converted into the corresponding flow data through the formula, and finally displayed to the instrument or output to the host computer system.

How it works. The electromagnetic flowmeter is a flowmeter that measures the flow rate according to Faraday's law of electromagnetic inductance. The advantage of electromagnetic flowmeters is that the pressure loss is extremely small and the measurable flow range is large.

The ratio of the maximum flow rate to the minimum flow rate is generally more than 20:1, the applicable industrial pipe diameter range is wide, up to 3m, the output signal and the measured flow rate are linear, the accuracy is high, and the fluid flow rate of acid, alkali, salt solution, water, sewage, corrosive liquid, mud, mineral pulp, pulp and so on with a conductivity of 5 s cm can be measured. However, it cannot measure the flow of gases, vapours and purified water.

Hello,Imported electromagnetic flowmeter manufacturer from the United States - Kornke KNKEGlad for your question.

KNKE electromagnetic flowmeter.

The working principle of electromagnetic flowmeters is based on Faraday's law of electromagnetic induction. In an electromagnetic flowmeter, the conductive medium in the measuring tube is equivalent to the conductive metal rod in the Faraday test, and the two electromagnetic coils at the upper and lower ends produce a constant magnetic magnetism, which often generates an induced voltage when a conductive medium flows through. Two electrodes inside the pipe measure the induced voltage generated.

The measuring pipe is electromagnetically isolated from the fluid and the measuring electrode by means of a non-conductive lining (rubber, Teflon, etc.).

Electromagnetic Flowmeter: Measure flow based on Faraday's law of electromagnetic induction.

u=b*l*v

U-Induced EMF B-Magnetic Field Strength L-Conductor Length V-Conductor Velocity.

The coil formed by the copper wire produces an alternating magnetic field b. The controlled current guarantees that the magnetic field strength remains constant throughout the entire measurement process. The length of the conductor l (the distance between the two measuring electrodes in the inner diameter of the measuring tube) is a constant.

The only variable in the equation is the flow velocity v of the fluid. The instrument can directly measure the induced voltage between the electrodes, and the induced voltage is linearly proportional to the fluid shunt velocity u v. The flow rate is then calculated, and the electromagnetic flowmeter measures the flow rate not by volume.

Flow velocity is converted into volumetric flow:

q=v*aq-volume flow rate v-liquid flow rate a-flowmeter cross-sectional area.

This calculates the volumetric flow rate of the liquid in the pipe.

Electromagnetic flowmeter is an instrument that applies the principle of electromagnetic induction to measure the flow rate of conductive fluid according to the electromotive force induced by the conductive body when it passes through an external magnetic field.