Is a new type of flowmeter, vortex flowmeter can measure closed pipe fluid flow. It at the time of installation of straight pipe has certain requirements, what are the specific requirements? Detailed requirements are as follows: 1, if the upstream flow meter installed point reducer, upstream flow meter shall be not less than 15 d ( D for pipe diameter) The straight pipe sections, such as the downstream straight pipe section should be not less than 5 d. 2, if install point of upstream have divergent tube flowmeter, flow meter should be not less than 18 d (upstream D for pipe diameter) The straight pipe sections, such as the downstream straight pipe section should be not less than 5 d. 3, if the upstream flow meter installed point 90 ° elbow joint or downward, the upstream flow meter shall be not less than 20 d straight pipe sections, such as the downstream straight pipe section should be not less than 5 d. 4, if the upstream flow meter installed point on the same plane with 90 ° elbow, upstream flow meter shall be not less than 25 d straight pipe sections, such as the downstream straight pipe section should be not less than 5 d. 5, flow control valve or pressure regulating valve installed in the downstream of the flow meter 5 d as much as possible to the distance, if must be installed in the upstream of flowmeter. 6, flow meter to avoid the overhead of a very long line installation, after such a long time, because of the flowmeter prolapse is very easy to cause flowmeter Yu Falan seal leak, if necessary when installation, must be set separately in the upstream and downstream of the 2 d flow meters place pipe clamp device. Above is the vortex flow meter installed on the specific requirements of the straight pipe.
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Abstract: the scale of electromagnetic flowmeter sensor is how to correct installation information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Electromagnetic flowmeter is widely used in sewage, fluorine chemical industry, production water, tap water industry and pharmaceutical, steel, and so on many aspects. Because principle determines it can only measure conductive liquid. Although it in terms of reliability and stability are better than other kinds of flowmeter. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a scale of electromagnetic flowmeter sensor article details how to properly installed. Electromagnetic flowmeter is widely used in sewage, fluorine chemical industry, production water, tap water industry and pharmaceutical, steel, and so on many aspects. Because principle determines it can only measure conductive liquid. Although it in terms of reliability and stability are much better than other kinds of flowmeter, but customers in the process of actual use, or will happen some problems, in this paper, the electromagnetic flowmeter detailed said on the selection and installation. Electromagnetic flowmeter sensor installation should pay attention to the following questions: one, the installation place of ordinary electromagnetic flow enclosure protection grade reaches IP65 ( GB4208 rules of dustproof splash water level) To the requirements of the installation site is: 1) When measuring mixed phase flow, should choose the place that does not cause phase separation; 2) Choose the place that there will be no negative pressure measuring tube; 3) Avoid installation near high voltage equipment such as motors, transformers, lest cause electromagnetic interference; 4) Avoid installed around the place that has a strong corrosive gas; 5) The environment temperature should be in commonly - 25 ~ 60 ℃ range, as far as possible, avoid direct sunlight. 6) Installed in no vibration or the place of small vibration. If the vibration is too large, should in the sensor before and after the pipe plus fixed support. 7) Environmental relative humidity shall generally be in the range of 10% ~ 90%; 8) Avoid installed in straight tube can be rain or submerged by water. If the sensor is IP67 protection grade ( Dust-proof and flooding level) Or IP68 ( Dust-proof and diving level) Zui, after two can not make the request. Second, the straight pipe length electromagnetic flowmeter requirement for straight pipe length before table is low. Typically, for 90 & deg; Elbow, tee, tee, reducer, and fully open the valve and flow resistance and attachments from the sensor electrode shaft centerline ( Not sensor import face) Should be a 3 - 5 d straight pipe length; For different opening of the valve and will have 10 d straight pipe length; Commonly after sensor should have a 2 d straight pipe length. When the valve is not fully open, if the direction of the valve closure and sensor electrode axis 45 & deg; Installation, can greatly reduce the additional error. Three, installation position and flow direction of electromagnetic flow sensor can be horizontal, vertical or inclined installation. When mounted horizontally, the sensor electrode shaft must be placed. This will prevent the entrained air bubbles due to fluid and the electrode insulated short time; Also can prevent electrode is covered by fluid in the sediments. Should not install the sensor in zui high, in order to prevent gas buildup, installed in a piping zui high, as the poor installation location, should be avoided. Vertical installation, should make the direction of flow upward, this makes no flow or flow is very small, the entrainment of fluid in the heavier solid particles sinking, and lighter fatty substances rising leave sensor electrode area. Measure the mud, the liquid-solid two phase flow such as pulp, vertical installation can avoid solid phase precipitation and sensor lining uneven wear. The pipeline under always exit, for bad installation location, should be avoided. Back pressure sensor installation area should be, sensor export direct emptying of the measuring tube liquid filled tube, for bad installation location, should be avoided. In order to prevent to produce negative pressure sensor, the sensor should be mounted at the rear of the pump, and should not be installed in the front of the pump. Four, install bypass pipe for liquid flow static check and adjust the zero point, when the medium and small diameter should install bypass pipe as far as possible. Should be considered when measuring sediment containing fluid, easy to clean the sensor installation method. Five, the ground in order to make the measuring accuracy and electrode current corrosion will not occur, electromagnetic flow sensor must be separate grounding, and makes the sensor and the fluid around at the same potential. Separation type electromagnetic flow meter, grounding in principle should be in sensor, converter grounding should be in the same place, in most cases, the sensor of built-in reference electrode or metal tubes can ensure potential balance. Therefore, can be built in ground reference electrode and metal pipe flow, the sensor of the ground lug connected to ground wire. If the sensor is installed on the pipeline with cathodic corrosion protection, in addition to the sensor and grounding ring together, with a thick copper wire around the sensor jumper on two flanges in the pipeline, between the sensor and the cathodic protection current. Electromagnetic flowmeter during installation or operation flow shows negative this is normal phenomenon, reinstall. Sensors according to flow to the logo not installed, resulting in measurement in the opposite direction. The fault will certainly have the solution, so there's no need to worry about. Measuring pipe hollow tubes or not full of pipe, there is a gas. The meter will show a negative number or flow value, big and small. The sensor signal lines, because the electromagnetic flowmeter to the positive and negative function of the flow measurement, shows the reverse flow. Will signal switch. Full of measured medium, make the pipe flowmeter with measuring conditions. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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With the rapid growth of the number of decentralized structure designs in manufacturing automation and process automation, the application of fieldbus is becoming more and more extensive. Profibus is a standardized, open fieldbus standard developed by Siemens and other companies that does not depend on equipment manufacturers. It can be used in occasions with strict time requirements and high-speed data transmission, as well as in large-scale and complex communication occasions. . It is not only suitable for the application of discrete processing in industrial automation, but also suitable for the application of continuous and batch processing in process automation. It has been widely used in manufacturing automation, process industry automation, building automation, transportation, electric power and other automation fields. At present, many automation equipment manufacturers in the world provide Profibus interfaces for their equipment. According to different application characteristics and user needs, Profibus field bus includes three main specification subsets: Profibus-FMS, Profibus-DP and Profibus-PA[ 1]. Gas mass flow controller (Gas Mass Flow ntroller, referred to as MFC) is used for precise measurement and control of gas mass flow, in semiconductor integrated circuit technology, special material discipline, chemical industry, petroleum industry, medicine, environmental protection and vacuum, etc. It has important applications in scientific research and production in various fields. The CS200 Profibus MFC is based on the Profibus-DP protocol to realize its application in the Profibus-DP industrial control network. 2 Hardware circuit design structure As an open, manufacturer-independent, and non-intellectual property protection standard, the Profibus protocol can be implemented on any microprocessor in principle. This design uses“Microcontroller MCU+Profibus communication chip”The solution is that the protocol chip implements the data link layer protocol of Profibus-DP, the MCU basically initializes the protocol chip and performs subsequent data interaction, and the asynchronous serial communication interface completes the physical layer communication [2]. In terms of hardware design structure, MFC mainly includes: MCU control module, Profibus-DP intelligent slave station interface module, slave station address setting module, sensor module, solenoid valve module and power supply module, etc. The product hardware structure block diagram is shown in Figure 1 . Figure 1 Product hardware structure block diagram 2.1 MCU control module The microprocessor of MFC uses Microchip's 16-bit high-performance DSP chip dsPIC30F6012A, which has 8KB of SRAM and 4KB of EEPROM, which meets the requirements of data exchange during Profibus-DP and RS-485 communication The characteristic of relatively large quantity. 144KB Flash program memory with high reliability and stability, which meets the characteristic requirements of the flowmeter with multiple functions. Using low-power high-speed flash memory technology, the maximum working speed can reach 30MIPs. The chip has a complete interface type, supports SPI synchronous serial interface mode, and meets the requirements of fast communication between the microprocessor and the VPC3+S protocol chip. the
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Coriolis flow meters are widely used in various industries to measure the flow of liquids and gases. These flow meters operate on the principle of Coriolis force, which causes a vibrating tube to twist proportional to the mass flow rate. However, calculating the flow through a Coriolis flow meter can be a complex process that requires an understanding of the meter's design and operating principles. In this article, we will explore how to calculate flow through a Coriolis flow meter and discuss the factors that can affect the accuracy of these measurements.

Understanding the Operating Principles of Coriolis Flow Meters

Coriolis flow meters operate based on the principles of fluid dynamics and the Coriolis effect. When a fluid flows through the meter, it causes the meter's tubes to vibrate, and the Coriolis effect causes a phase shift between the input and output vibrations. The amount of phase shift is proportional to the mass flow rate of the fluid, allowing the meter to measure flow. The operating principles of Coriolis flow meters make them highly accurate and precise, making them suitable for a wide range of applications.

To calculate flow through a Coriolis flow meter, it is essential to understand how these operating principles translate into mathematical equations. The equations used to calculate flow through a Coriolis flow meter take into account the phase shift between the input and output vibrations and the physical properties of the fluid, such as density and viscosity. By understanding these equations, engineers can accurately determine the flow rate of the fluid passing through the meter.

Factors Affecting the Accuracy of Flow Measurement

Several factors can affect the accuracy of flow measurement using Coriolis flow meters. One of the most critical factors is the density and viscosity of the fluid being measured. Coriolis flow meters are sensitive to changes in fluid properties, so variations in density and viscosity can lead to inaccuracies in flow measurements. Additionally, external factors such as temperature and pressure can also affect the accuracy of flow measurements. It is essential to account for these factors when calculating flow through a Coriolis flow meter to ensure accurate results.

Another factor that can impact the accuracy of flow measurement is the installation and mounting of the flow meter. Proper installation is crucial for ensuring that the meter operates within its specified parameters and provides accurate measurements. Mounting the meter incorrectly or in an environment with excessive vibration can lead to measurement errors. Engineers must take into account these factors when calculating flow through a Coriolis flow meter to achieve accurate results.

Calculating Flow Through a Coriolis Flow Meter

The process of calculating flow through a Coriolis flow meter involves several steps. First, engineers must understand the operating principles of the meter and the mathematical equations used to determine flow rate. Once they have a grasp of these principles, they can proceed to gather the necessary information, such as the density and viscosity of the fluid, the operating conditions, and the specifications of the flow meter.

Next, engineers can use the mathematical equations provided by the meter manufacturer to calculate the flow rate. These equations take into account the phase shift between the input and output vibrations, the physical properties of the fluid, and the operating conditions. By inputting the relevant data into these equations, engineers can obtain an accurate measurement of the flow rate through the Coriolis flow meter.

It is essential to note that the accuracy of the calculated flow rate depends on the accuracy of the input data and the proper application of the mathematical equations. Engineers must ensure that they have obtained accurate measurements of fluid properties and operating conditions to achieve reliable results. Additionally, they must follow the guidelines provided by the meter manufacturer for using the mathematical equations to calculate flow through the meter accurately.

Challenges and Considerations in Flow Measurement

Despite their precision and accuracy, Coriolis flow meters can present challenges in flow measurement. These challenges stem from factors such as fluid properties, operating conditions, and installation considerations. Engineers must take these challenges into account when calculating flow through a Coriolis flow meter to ensure accurate and reliable results.

One of the primary challenges in flow measurement using Coriolis flow meters is the impact of fluid properties on meter performance. Variations in fluid density and viscosity can lead to measurement errors, so engineers must account for these variations when calculating flow rates. Additionally, changes in temperature and pressure can also affect the performance of the meter, making it essential to consider these factors in flow calculations.

Another consideration in flow measurement is the potential for meter installation and mounting issues to impact measurement accuracy. Improper installation or mounting can lead to measurement errors, so engineers must carefully follow the manufacturer's installation guidelines to achieve accurate results. Additionally, environmental factors such as excessive vibration can also affect meter performance, so engineers must ensure that the meter is installed in a suitable environment.

Summary

In conclusion, calculating flow through a Coriolis flow meter requires an understanding of the meter's operating principles, mathematical equations, and the factors that can affect measurement accuracy. By taking into account the operating principles of the meter, the factors that can impact measurement accuracy, and the challenges and considerations in flow measurement, engineers can accurately determine the flow rate of fluids passing through Coriolis flow meters. It is essential to carefully follow the guidelines provided by the meter manufacturer and ensure that accurate data is input into the mathematical equations to achieve reliable results. With the proper understanding and application of these principles, engineers can make accurate flow measurements using Coriolis flow meters for a wide range of industrial applications.

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