Abstract: the precession vortex flowmeter scale and scale vortex flowmeter fundamental difference information produced by excellent flow meter, flow meter manufacturer to offer you the quotation.

First of all, though, these two kinds of flowmeter is the use of fluid oscillation of the principle of flow meter, but separately using two different works.

Vortex flowmeter is by using the theory of karman vortex flowmeter: when fluid through a cylindrical object, in this.

More flow meter manufacturers choose model price quote you are welcome to inquire, here is a type of precession vortex flowmeter scale and vortex flow meter scale the fundamental difference between article details.

First of all, though, these two kinds of flowmeter is the use of fluid oscillation of the principle of flow meter, but separately using two different works.

Vortex flowmeter is by using the theory of karman vortex flowmeter: fluid after a cylindrical objects, and can produce vortices on either side of the object back to fluid, depressed when side vortex happens on the other side of the spiral, when on one side of the vortex development to a certain extent from columnar objects follow fluid and to produce new vortex in situ, at the same time, on the other side of the vortex loss of repression and happen, and stressed the new vortex, alternately on each side of pillars above process, the frequency of associated with the flow velocity of fluid, detecting the frequency velocity can be obtained, and then flow value is obtained.

Due to release of vortex behind alternately fluid as the road on both sides of the object in the general arrangement, so this kind of phenomenon is also called the vortex.

According to the principle of the work of the flowmeter is called vortex street flowmeter or karman vortex flowmeter.

Precession vortex flowmeter is the use of precession model: principle of vortex flowmeter in the pipeline is set a group of twisted blade vortex generator, rotating in the fluid passes, and form vortex near the center line of the pipeline, the vortex at the center of the side revolve around the center line of the pipeline, along with the fluid forward while expanding radius of turn, makes the vortex center into a similar precession of conical spiral movement.

At this time in the vortex generator on the rear wall of a point, it will happen through the fluid velocity of a cyclical change, its frequency associated with the flow velocity of fluid, detecting the frequency velocity can be obtained, and then flow value is obtained.

According to the principle of the work of the flowmeter is called vortex precession flowmeter or type of vortex flowmeter vortex flowmeter is generally refers to the vortex flowmeter.
Measuring gas, steam and liquid medium.

It is to use the principle of karman vortex street flowmeter.

Main structures include circular measuring tube, vortex occurred (
Triangle, cylindrical, etc. )
, sensing head, temperature and pressure components, etc.

Precession vortex flowmeter is a kind of special measuring gas of a meter.

Mainly consists of a venturi sounding pipe body, on the front and rear rectifier, sensing head, and the temperature and pressure components.

The above information is provided by golden lake dahua automation instrument and hope will be helpful to you.

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 selection principle of flow meter is provided by the excellent flow meter and flow meter production and quotation manufacturers. Flowmeter selection refers to considering the safety, accuracy and economy of measurement in a comprehensive manner according to the production requirements, starting from the actual situation of instrument product supply, and determining the method and measuring instrument of the flow sampling device according to the nature and flow of the fluid to be measured. type. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the article on the selection principles of flowmeters. Flowmeter selection refers to considering the safety, accuracy and economy of measurement in a comprehensive manner according to the production requirements, starting from the actual situation of instrument product supply, and determining the method and measuring instrument of the flow sampling device according to the nature and flow of the fluid to be measured. type and specifications. The safety and reliability of flow measurement, first of all, the measurement method is reliable, that is, the sampling device will not cause an accident due to mechanical strength or electrical circuit failure during operation; the second is that the measuring instrument will not affect the safety of the production system regardless of normal production or failure. . For example, for the measurement of high-temperature and high-pressure main steam flow in a power plant, the primary measuring element installed in the pipeline must be firm to ensure that no mechanical damage will occur under high-speed steam erosion. Therefore, standard throttling devices are generally preferred instead of non-standard speed measuring devices such as cantilever beam double horn tubes or insertion flowmeters, as well as target type and turbine flowmeters with low structural strength. For fuel-fired power plants and occasions with flammable gas, explosion-proof instruments should be used. Flowmeter selection refers to considering the safety, accuracy and economy of measurement in a comprehensive manner according to the production requirements, starting from the actual situation of instrument product supply, and determining the method and measuring instrument of the flow sampling device according to the nature and flow of the fluid to be measured. type and specifications. The safety and reliability of flow measurement, first of all, the measurement method is reliable, that is, the sampling device will not cause an accident due to mechanical strength or electrical circuit failure during operation; the second is that the measuring instrument will not affect the safety of the production system regardless of normal production or failure. . For example, for the measurement of high-temperature and high-pressure main steam flow in a power plant, the primary measuring element installed in the pipeline must be firm to ensure that no mechanical damage will occur under high-speed steam erosion. Therefore, standard throttling devices are generally preferred instead of non-standard speed measuring devices such as cantilever beam double horn tubes or insertion flowmeters, as well as target type and turbine flowmeters with low structural strength. For fuel-fired power plants and occasions with flammable gas, explosion-proof instruments should be used. On the basis of ensuring the safe operation of the instrument, we strive to improve the accuracy and energy saving of the instrument. To this end, not only the display instrument that meets the accuracy requirements should be selected, but also a reasonable measurement method should be selected according to the characteristics of the measured medium. The main steam flow measurement of power plants, because it is very important to the safety and economy of the power plant, generally adopts mature standard throttling capacity and differential pressure flow meters. The sewage and fuel oil treated by chemical water treatment belong to dirty flow and low Reynolds respectively. For several viscous flows, standard throttling is not applicable. For dirty flow, non-standard throttling parts such as circular orifice plate are generally used with differential pressure gauge or ultrasonic Doppler flowmeter, while for viscous flow, volumetric flowmeter, target type or wedge flowmeter can be used respectively. The water volume of the turbine population, the circulating water volume of the condenser and the regenerative steam of the regenerative unit are all flow measurement parameters of large pipe diameter (above 400mm). Due to the difficulty in processing and large pressure loss, standard throttling devices are generally not used. According to the characteristics of the medium to be measured and the requirements of measurement accuracy, the flow rate is measured by using plug-in flowmeter, differential pressure gauge with speed measuring element, ultrasonic flowmeter, or non-destructive methods such as marking method and simulation method. In order to ensure the service life and accuracy of the flowmeter, the anti-vibration requirements of the instrument should also be paid attention to when selecting the model. In humid and hot areas, damp and hot meters should be selected. Correctly selecting the specifications of the instrument is also an important part of ensuring the service life and accuracy of the instrument. Special attention should be paid to the selection of static pressure and temperature resistance. The static pressure of the instrument is the pressure resistance degree, which should be slightly larger than the working pressure of the measured medium, generally 1.25 times, to ensure that no leakage or accident occurs. The selection of the measuring range is mainly the selection of the upper limit of the scale of the instrument. If it is too small, it is easy to overload and damage the instrument; if it is too large, it will hinder the accuracy of the measurement. Generally selected as 1.2 to 1.3 times the maximum flow value in actual operation. For long-term contact meters installed on production pipelines, the energy loss caused by the flow measuring element should also be considered. In general, multiple measuring elements with large pressure loss, such as throttling elements, should not be used in the same production pipeline. In short, there is no measurement method or flowmeter that can adapt to various fluids and flow conditions. Different measurement methods and structures require different measurement operations, usage methods and usage conditions. Each type has its own unique advantages and disadvantages. therefore,On the basis of a comprehensive comparison of various measurement methods and instrument characteristics, the best type that is suitable for production requirements and is both safe and reliable, economical and durable should be selected. On the basis of ensuring the safe operation of the instrument, the electromagnetic flowmeter strives to improve the accuracy and energy saving of the instrument. To this end, not only the display instrument that meets the accuracy requirements should be selected, but also a reasonable measurement method should be selected according to the characteristics of the measured medium. The main steam flow measurement of power plants, because it is very important to the safety and economy of the power plant, generally adopts mature standard throttling capacity and differential pressure flow meters. The sewage and fuel oil treated by chemical water treatment belong to dirty flow and low Reynolds respectively. For several viscous flows, standard throttling is not applicable. For dirty flow, non-standard throttling parts such as circular orifice plate are generally used with differential pressure gauge or ultrasonic Doppler flowmeter, while for viscous flow, volumetric flowmeter, target type or wedge flowmeter can be used respectively.
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Abstract: The latest application information of the new flow meter in the cement industry is provided by the excellent flow meter and flow meter production and quotation manufacturers. 1. New flowmeters are used in the cement industry. Various flowmeters are widely used in chemical, petrochemical steel, electric power, heating and water treatment industries to measure the flow of various liquids and gases. With the continuous demand for flow measurement in the industrial field. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the new application of new flowmeters in the cement industry. 1. The new type of flowmeter has been used in the cement industry. Various flowmeters are widely used in chemical, petrochemical steel, electric power, heating and water treatment industries, and are used to measure the flow of various liquids and gases. With the continuous improvement of the requirements for flow measurement in the industrial field, various new flowmeters have appeared in the market, and they are named with different modified terms according to the measurement mechanism, such as Coriolis, ultrasonic, electromagnetic, vortex flowmeters, etc. , Compared with the traditional positive displacement, Venturi and mechanical orifice flowmeters, the new flowmeters have more novel features and are significantly better than the old flowmeters in terms of accuracy, reliability, repeatability and maintainability. In these devices, there are few or no moving parts that are prone to wear; most flowmeters are non-intrusive elements, with less pressure drop and better safety; many meters are equipped with micro The processor, which can perform self-diagnosis and other functions, can provide users with real-time feedback and historical data collection. Compared with other industries, various flowmeters are less used in the cement industry. This is because the main media in the production process are material flow and air flow, while powder and particles are the main medium in the material flow. In the main process flow, liquid materials are used. There is almost no flow, and the airflow also contains a certain amount of dust and passes through a large pipe, which brings great difficulty to flow measurement. Although in some process points, such as the air volume of each chamber of the cooler, because the high-pressure air flow is measured, the diameter of the pipe is not large, and the traditional Venturi tube is generally used, which can be measured by differential pressure, but due to the low measurement accuracy, The flow value can only be used as a reference, and it is also difficult to use it to adjust the opening of the damper. It is also difficult to maintain a constant air volume. At present, some production lines with a daily output of 5,000 tons have not measured the flow of high-pressure air, but estimated by measuring the electrical power output by the high-pressure roots blower. flow. Therefore, flow measurement was almost a blank in the cement industry in the past, and automation technicians often only know measurement sensors such as temperature, pressure, and material level. As the scale of cement production increases and the technological process is constantly updated, flow measurement and new flow meters have also begun to be applied in the cement industry. 1. Measurement of gas flow in large pipelines, some dry cement production lines introduced in the early days, foreign companies proposed to detect gas flow at the outlet of the kiln and in the large pipeline for waste gas treatment and adjust the relevant valves accordingly. Even velocity tube flowmeter, etc., but it is too difficult to use. Since the flow measurement does not affect the production of cement, it has not been used since then. With the continuous update of cement technology and scale, large-scale vertical mills have been widely used. In the process of vertical mills, it is required to measure the inlet and outlet air volume of the mill and keep the circulating air volume constant. For example, the 3300-ton cement production line exported from my country to Oman, The vertical mill of Feifan is used, which is required in the list of measuring points. The diameter of the outlet air duct of the raw mill of the 3,000-ton cement production line per day is generally about 800 mm. In the flow measurement specification, the pipe diameter greater than 200 mm belongs to the large-diameter flow measurement. For example, with a traditional orifice flowmeter, during operation, due to the sharp edge of the orifice of the orifice being worn, the plate surface is stained, and the pipeline accumulates and condenses. ash, it needs to be replaced after wear; the orifice flowmeter also has the disadvantages of small range ratio, low precision, and large irreversible pressure loss; for large-diameter pipelines, large flanges are required, and its price, installation cost and maintenance are also one. Issues worthy of attention. In addition, the gas flow measurement is affected by changes in temperature and pressure, which will have a serious impact on the gas flow measurement, mainly in terms of accuracy and repeatability; in the cement industry, the measured process gas mostly contains dust, and the measurement sensor Generally, there are small holes in the middle, and the dust will easily cause the blockage of the measuring sensor. Therefore, it is difficult to measure the gas flow of the large pipeline in the cement industry, and there are many problems to be solved. With the emergence of a new type of differential pressure equalizing velocity tube flowmeter in the market, it has solved the problem of measuring gas flow in large pipelines. It has the characteristics of large range ratio, high precision, and small irreversible pressure loss. To prevent dust in the gas from clogging the measuring sensor. This article will focus on the working principle, basic structure, performance characteristics and applications of the new differential pressure equalizing velocity tube flowmeter.
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Gas mass flow meters are suitable for precise measurement of gas mass. It converts the measured gas mass flow into the corresponding gas volume flow under standard conditions or gas mass flow under standard conditions. Gas mass flowmeter has the characteristics of high precision, long life, good repeatability, wide flow range, stable and reliable, etc. The method of testing gas quality to measure the flow of gas is currently in the leading position in China. Working principle The gas mass flowmeter is composed of a gas flow quality sensor and a digital display integrator. The gas mass flowmeter adopts the American Microbridge gas flow mass sensor and pressure sensor. The airflow quality sensor is based on the heat transfer principle that the heat taken away by the airflow quality flowing through the sensor is proportional to its output voltage. The pressure sensor is that the pressure of the gas is proportional to the output voltage, that is, the gas mass flow and gas pressure are simultaneously converted into analog signal output. The function of the digital display integrator is to convert the airflow quality analog electrical signal output by the airflow quality sensor into a digital signal through the A/D inside the single-chip microcomputer. After calculation and processing, the mass flow rate of the gas is converted into the corresponding volume flow rate under the standard state or the mass flow rate under the standard state. After data processing and calculation, the real-time flow and cumulative flow are calculated respectively, and sent to four-digit and eight-digit digital tubes for display. The digital display integrator can also convert the gas pressure analog electrical signal output by the pressure sensor into A/D through the single chip microcomputer, and send the gas pressure value to the three-digit digital tube for display. In addition, the single-chip microcomputer can store various constants and coefficients related to the calculation process, and the data information such as the upper and lower limits of the real-time flow and the pressure upper and lower limits set manually in the EEPROM of the single-chip microcomputer for permanent storage. The microcontroller can also store the accumulated flow value into the EEPROM memory. The above data information can be automatically saved after a power failure, and can be automatically restored after the power supply is restarted.
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1. Self-diagnosis technology Self-diagnosis technology is to judge whether the equipment status is normal, the cause, location, degree and life prediction of the abnormality or failure through various detection and analysis without stopping the machine or basically not disassembling the machine. The main function of self-diagnosis technology is to obtain the result state information of the equipment, that is, to identify the state and abnormality of the product according to the comprehensive analysis of all state information such as the accuracy of the equipment under various working conditions, zero drift, and internal leakage. The nature of the type and severity of anomalies is a process that includes signal acquisition, information extraction, information synthesis, fault identification, and information utilization. The goal of self-diagnosis is to ensure the stable operation of the product in terms of function, accuracy, efficiency and reliability. Figure 1 The goal of self-diagnosis 2. The application of self-diagnosis technology in gas mass flow controllers Semiconductor equipment requires high precision for gas mass flow controllers. After a period of use of traditional gas mass flow controllers, Due to environmental temperature, gas pollution and other reasons, the accuracy may be out of tolerance, but due to the limitation of detection conditions, the user cannot test the accuracy of the gas mass flow controller. Therefore, it is necessary to study a self-diagnosis technology, through which the user can check the accuracy of the gas mass flow controller at any time. To increase the self-diagnosis function of the gas mass flow controller, the flow rate needs to be obtained through the primary flow measurement principle. If Qm is the mass flow rate of gas, the change curve of pressure with time can be established according to the change equation of pressure, temperature and gas flow, as shown in Figure 2: Figure 2 The change curve of pressure with time Through this figure, a gas mass flow controller can be established The accuracy corresponding table, in the process of self-diagnosis, compare with the information in this table, and judge whether the accuracy of the system is within the required range through the similarity of the two curves. The self-diagnosis technology greatly improves the reliability of the gas mass flow control system and improves the system functions. 3 Advantages of self-diagnosis technology Using the intelligent analysis of self-diagnosis technology, the mass flow controller can make intelligent detection, predict the possible failure of the equipment, and automatically eliminate it or make an alarm response based on the prediction , this process can achieve better economic benefits for the maintenance of the product itself, not only the workload of the staff can be effectively reduced, the self-diagnosis results can also be provided comprehensively, and the maintenance personnel can also respond to A more complete and effective maintenance plan will be formulated, and the maintenance and implementation will be more ideal.