Abstract: the electromagnetic flow meter scale advantages and shortcomings of the information produced by excellent flow meter, flow meter manufacturer to offer you the quotation.

On the structure, electromagnetic flowmeter consists of two parts, electromagnetic flow sensor and converter.

Sensor installed on the industrial process piping, its role is to flow into the pipe of liquid volume flow values into a linear change of induced electric potential signal, and through the transmission line.

More flow meter manufacturers choose model price quote you are welcome to inquire, here is the electromagnetic flowmeter scale advantages and shortcomings of the article details.

On the structure, electromagnetic flowmeter consists of two parts, electromagnetic flow sensor and converter.

Sensor installed on the industrial process piping, its role is to flow into the pipe of liquid volume flow values into a linear change of induced electric potential signal, and through the transmission line will be sending the signal converter.

Converter is installed in place not far away from the sensor, it will flow from sensor signal amplifier, translates into electrical signal proportional to the standard traffic signal output, for display, accumulation and adjustment control.
The main advantage of the electromagnetic flowmeter is as follows: 1)

Electromagnetic flowmeter sensor structure is simple, the measuring tube has no moving parts, no obstacles to fluid flow throttling components.

So when the fluid flow through timing does not cause any additional pressure loss, flow meter is running in one of the flowmeters zui low energy consumption.
2)

Measurable smudges medium, corrosive medium and clouding the liquid-solid two phase flow of traffic.

This is due to internal unimpeded flow meter tube parts, and the measurement of body contact is sounding pipe lining and electrode, the materials can choose according to the nature of the current body.

For example, made from poly three fluoride or ptfe lining, can measure all kinds of acid, alkali, salt and other corrosive medium.

Adopt wear-resisting rubber lining, is especially suitable for measuring with solid particle slurry, water slurry, wear a large liquid-solid two phase flow and various liquid with fiber and pulp suspension.
3)

Electromagnetic flowmeter is a kind of volume flow measuring instrument, in the process of measurement, it is not affected by the temperature of the measured medium, viscosity and density with conductivity (
In a certain range),
The influence of.

Therefore, electromagnetic flowmeter only after water calibration, it can used to measure the conductivity of liquid flow.
4)

The output of the electromagnetic flowmeter is proportional to the average flow velocity of the measured medium only, and with the flow state of symmetrical distribution (
Laminar or turbulent)
Has nothing to do.

So the electromagnetic flowmeter range very wide range, the measurement range can be up to 100:1, some even up to 1000:1 working flow range.
5)
Electromagnetic flowmeter (
）

No mechanical inertia, responsive, can measure the instantaneous pulse flow, also can measure the rate of flow of positive and negative two directions.
6)

Industrial use very wide range of the calibre of the electromagnetic flowmeter, from a few millimeters to a few meters, and the domestic existing diameter up to 3 m's real flow calibration equipment, which laid a foundation for the application and development of electromagnetic flow meter.

Electromagnetic flowmeter is still the main deficiencies are as follows.
1)

Cannot be used to measure the gas, steam, and contains a lot of gas liquid.
2)

Cannot be used to measure the low conductivity of liquid medium, such as the petroleum products or organic solvent such as medium, the electromagnetic flowmeter is powerless.
3)

Ordinary electromagnetic flow meter used in industry due to the measuring tube lined with the limitation of materials and electrical insulation materials, can not be used in measuring high temperature medium;

If without special treatment, also cannot be used for the measurement of low temperature medium, in order to prevent the measuring tube outer condensation (
Frost)
Destruction of insulation.
4)

The influence of electromagnetic interference electromagnetic flowmeter are susceptible to the outside world.

Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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Abstract: The information on the main factors causing the measurement error of the precession vortex flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. Precession vortex flowmeter is a new generation of flowmeter that integrates the functions of flow, temperature and pressure detection, and can perform automatic compensation of temperature, pressure and compression factor. Directly detect the standard volume flow and standard volume total of the gas. . More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the main factors that cause the measurement error of the precession vortex flowmeter. The details of the article. Precession vortex flowmeter is a new generation of flowmeter that integrates flow, temperature and pressure detection functions, and can automatically compensate for temperature, pressure and compression factor. Directly detect the standard volume flow and standard volume total of the gas. Because it has no mechanical rotating parts, is not easy to corrode, has high reliability, good stability, and requires no maintenance for long-term work, it has been widely used in various metering stations of the world's largest natural gas production and sales plants. However, due to the difference in natural gas gas quality in the pipeline, changes in operating conditions and errors caused by other factors, the measurement accuracy of the intelligent precession vortex flowmeter is reduced. Therefore, it is of great significance to find out the cause of the measurement error of the flowmeter, to propose improvement measures, and to make a detailed plan for improving the measurement accuracy of natural gas. 1. Working principle of precession vortex flowmeter The intelligent precession vortex flowmeter belongs to the velocity type measuring instrument. The fluid entering the flowmeter generates a vortex flow through the vortex generator. The vortex flow precesses in the venturi, and the sudden throttling when it reaches the constriction section is the acceleration of the vortex flow. When the vortex flow enters the diffusion section, it is forced to enter the precession secondary rotation due to the action of the backflow. The frequency of the vortex flow is proportional to the medium speed and has a linear relationship. It is detected by the pressure sensor, and the detected weak electrical signal can be converted after processing. is the flow signal. 2. The main factors that cause the measurement error of the flowmeter The factors that cause the error of the flowmeter, and the error caused by the measuring instrument (flow range, pressure change, straight pipe section factors). Errors caused by changes in use conditions (mechanical vibration, impurities in the medium, electromagnetic interference), etc. Therefore, in the process of rotating the vortex flowmeter, it must be considered whether these factors affect the normal operation of the flowmeter. 2.1 Measuring instrument errors such as: the influence of the flow range. Each specification of the flow meter has its flow range. When the medium flow is lower than the lower flow limit of the instrument, if the flow rate of the medium is too low, the flow rate cannot be detected, and the accuracy cannot be guaranteed; and when the flow rate is higher than the upper flow limit of the instrument. The pressure loss of TDS precession flowmeter is too large. Loss of pulses, meter leakage and other phenomena will occur, and the accuracy of the flowmeter cannot be guaranteed. In addition, due to the particularity of gas field development. Generally, in the early stage of development, the gas volume is large and the pressure is high, and in the later stage of development. The gas volume is constantly decreasing and the pressure is decreasing, so the turndown ratio of the flowmeter is a very critical factor. Another example: the impact of pressure changes. The accurate detection of pressure plays a decisive role in the accurate measurement of natural gas, especially to reduce relative errors. For an accuracy of ± 0.5%FS (full scale accuracy). The pressure sensor with a range of 0.5Mpa has a maximum measurement error of 0.5Mpa'x 0,5%=±2.5kPa; and when detecting the medium pressure of 200kPa. Its maximum relative error is±2.5kPa/200×100%=±1.25%. It can be seen that as the detection pressure increases, the relative error becomes smaller and smaller. There will always be errors of one kind or another in operation. Inadequate operation, lax management and other factors will also cause large measurement errors; in the place where the flowmeter is installed, in order to facilitate maintenance, there is generally a bypass process. If the bypass gate is not tightly closed or there is internal leakage, it will It will cause a large measurement error; if the flowmeter is not calibrated on time, the floating of the relevant parameters will also cause a large measurement error. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'The main factors causing the measurement error of the precession vortex flowmeter'
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Selection steps of turbine flowmeter: 1) Confirm the available measurement objects, which must be applicable to the medium of the turbine flowmeter. 2) Select the structure type. According to the selection of fluid physical properties, gas and liquid are respectively selected as gas type and liquid type turbine flowmeters, which cannot be used universally. When the viscosity of the liquid exceeds 5mPa .s under working conditions, high viscosity type should be selected (there is no finalized product yet). Acid-resistant fluid is selected for acid-resistant type (there is no fixed product yet). Choose according to the environmental conditions, choose the appropriate instrument according to the ambient temperature and humidity, if there is an explosive and flammable atmosphere around, you should choose an explosion-proof sensor. According to the choice of pipeline connection, the sensor has two installation methods: horizontal and vertical. When installed horizontally, there are flange connection, thread connection and clamp connection to the pipeline connection. Flange connections are used for medium-caliber pipes, threaded connections are used for small-diameter and high-pressure pipes, and clamp connections are only suitable for low-pressure, medium- and small-diameter pipes. For vertical mounting there is only threaded connection. Insert type turbine flowmeter is used for large diameter. 3) Select Specifications. According to the site use conditions, such as flow range, pipe diameter, fluid pressure and temperature, installation location, etc. and performance requirements, such as accuracy, repeatability, display mode, etc., refer to the manufacturer's selection sample or the instruction manual to select specific specifications and models, and there are also Maybe you can't find a suitable one, so you have to choose another flowmeter. Due to the various types and specifications of turbine flowmeters, especially the differences in the quality of products from different manufacturers, it is necessary to collect as much information as possible from manufacturers and relevant standards to conduct repeated investigations and comparisons before deciding on a choice.
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The use of flow meters must meet the back pressure requirements. When measuring liquefied gases or hot solvents, and media with a tendency to release gas, in order to prevent cavitation, it is necessary to ensure that the sensor installed in the pipeline has sufficient back pressure. Back pressure refers to the pressure of the fluid at the downstream port of the sensor, and is usually measured at the pipe within 3: the length of the sensor from the downstream port of the sensor. The minimum back pressure index is '5^4 厶 In the formula, 厶- is the pressure loss of the flowmeter; it is the saturated vapor pressure of the medium at the highest working temperature; X and 5 are coefficients, depending on the structure of the flow sensor and the nature of the medium , which are generally found experimentally. The goal is to avoid any point in the piping system where the pressure is not lower than the saturated vapor of the liquid in the pipe5 to prevent the liquid from vaporizing. The measuring tube of the straight tube flowmeter has high rigidity and high resonant frequency. Due to the various reasons mentioned above, when the back pressure is insufficient, the vibration stability of the measuring tube will be affected to some extent. Experiments show that when the flow rate is zero, at least 0,02^? should be kept in the flow measuring tube. 3; gauge pressure). To do this, install the sensor in the lower part of the riser, and the height of the riser downstream of the sensor should not be lower than 2:! ! (depending on the medium density), as shown in Figure 3.50.
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Real-Life Case Studies: Mass Flow Meter vs. Magnetic Flow Meter Performance

Introduction:

Flow meters play a crucial role in various industries, providing accurate measurements of fluid flow rates. Mass flow meters and magnetic flow meters are two common types used for different applications. This article will present real-life case studies comparing the performance of mass flow meters and magnetic flow meters. Through these studies, we aim to understand the strengths and limitations of each technology, providing valuable insights for selecting the most suitable flow meter for specific applications.

Case Study 1: Industrial Chemical Processing

In an industrial chemical processing plant, mass flow meters and magnetic flow meters were tested to measure the flow rate of a corrosive liquid. The mass flow meter, based on thermal dispersion technology, demonstrated excellent performance in accurately measuring the flow rate, regardless of temperature and pressure changes. Meanwhile, the magnetic flow meter struggled to provide reliable measurements due to the corrosive nature of the liquid, which caused the lining material to deteriorate rapidly. Thus, in such applications involving corrosive liquids, choosing a mass flow meter would be the ideal solution.

Case Study 2: Water Treatment Plant

A water treatment plant evaluated both mass flow meters and magnetic flow meters to measure the flow rate of clean water. In this case, the magnetic flow meter outperformed the mass flow meter due to its ability to measure conductive fluids accurately. The magnetic flow meter recorded higher accuracy in measuring the flow rate, even when dealing with varying water compositions and impurities. This case study highlights the importance of considering the fluid properties before selecting a flow meter for optimal performance.

Case Study 3: Food Processing Industry

A food processing factory conducted a comparative study to evaluate the accuracy and reliability of mass flow meters and magnetic flow meters for measuring the flow rate of food products. During the experiment, it was observed that both types of flow meters offered consistent accuracy. However, the mass flow meter had an advantage over the magnetic flow meter as it did not require any intrusive sensors that could contaminate the food. Therefore, in industries requiring utmost hygiene and cleanliness, mass flow meters can offer a reliable solution.

Case Study 4: Gas Distribution Network

A gas distribution company examined the performance of mass flow meters and magnetic flow meters in their distribution network. The mass flow meter, being independent of the gas composition and varying temperature and pressure conditions, provided accurate readings throughout the operations. On the other hand, the magnetic flow meter experienced challenges in measuring gas flow rates accurately, especially with varying gas compositions. This study suggests that, for gas applications, mass flow meters are better suited to ensure precise measurements and maintain the integrity of the distribution system.

Case Study 5: Petrochemical Refineries

Petrochemical refineries often deal with high-pressure and high-temperature fluids. Therefore, accurate and reliable flow measurement is crucial for optimal operations. In a petrochemical refinery, both mass flow meters and magnetic flow meters were tested to determine their performance. The mass flow meter, based on thermal dispersion, demonstrated excellent accuracy even under extreme conditions, such as high temperatures and pressures. However, the magnetic flow meter faced limitations due to inaccuracies caused by changes in electrical conductivity and temperature. This study emphasizes the significance of selecting the appropriate flow meter technology for critical applications in petrochemical refineries.

Conclusion:

Through these real-life case studies, it becomes evident that both mass flow meters and magnetic flow meters have their unique strengths and limitations. The choice between the two depends heavily on the specific application requirements, fluid properties, and environmental conditions. Engineers and professionals must carefully assess these factors to select the most suitable flow meter for accurate and reliable flow rate measurements.

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