Selection and application of flow meter

Abstract: The selection and application information of flow meters are provided by excellent flow meter and flow meter manufacturers. 1 Types and characteristics of flow meters Fluids exist widely in nature, and common air, water and blood are all fluids. The amount of fluid flowing through a cross-section of a pipe or device per unit time is called flow. Flow measurement is an extremely complex job. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the selection and application of flowmeters. 1 Types and characteristics of flow meters Fluids exist widely in nature, and common air, water and blood are all fluids. The amount of fluid flowing through a cross-section of a pipe or device per unit time is called flow. Flow measurement is an extremely complex job, and in terms of fluid objects, there are various liquids, gases and multiphase fluids. The measurement conditions are also very different. The fluid temperature range for flow measurement can be from high temperature to low temperature or even extremely low temperature; the pressure range can be from ultra-high pressure to low pressure; the flow range can be from large flow to small flow; the viscosity range can be from low viscosity to high Viscosity; the flow regime ranges from laminar flow, turbulent flow, pulsating flow and various multiphase flow patterns. Therefore, according to the measurement object and various measurement conditions, the corresponding flow measurement method should be used in the specific measurement. Instruments that measure fluid flow are collectively referred to as flow meters. There are many kinds of flow measurement methods and instruments, and their measurement principles, structure, characteristics, scope of application and use methods are different. So far, there are more than 60 types of flow meters available for industrial use. The reason why there are so many varieties is that a flow meter that is suitable for any fluid, any range, any flow state and any use conditions has not yet been found. There are many classification methods of flowmeters, which can be roughly divided into differential pressure flowmeters, positive displacement flowmeters, velocity flowmeters, and mass flowmeters in principle. This article will choose differential pressure flowmeter, positive displacement flowmeter, float flowmeter, turbine flowmeter, electromagnetic flowmeter, vortex flowmeter, etc. to describe their principles and characteristics respectively. 1.1 Differential pressure flowmeter Differential pressure flowmeter is a kind of flowmeter that uses the static pressure difference generated by the fluid flowing through the throttling device to measure the flow. Differential pressure flowmeter is composed of detection element (primary device), differential pressure signal pipeline and differential pressure gauge (secondary device), also known as throttle flowmeter, which is the most widely used type of flowmeter at present. Differential pressure flowmeters are usually classified by throttling devices, such as orifice flowmeters, Venturi tube flowmeters and nozzles. The throttling devices have been standardized and are called standard throttling devices. The secondary devices are various mechanical, electronic and electromechanical integrated differential pressure gauges, differential pressure transmitters and flow display instruments. It has been developed into a large class of instruments with a high degree of three-dimensionalization (serialization, generalization, standardization) and a large variety of specifications. It can measure both flow parameters and other parameters, such as pressure, level, density, etc. . The detection parts of differential pressure flowmeter can be divided into six categories according to their working principle: throttling device, hydraulic resistance type, centrifugal type, dynamic pressure head type, dynamic pressure head gain type and jet type. Differential pressure flowmeter is the most widely used flowmeter, and its usage occupies the first place in all kinds of flowmeters. In recent years, due to the advent of various new flowmeters, its usage has gradually declined, but it is still the most important type of flowmeter. It is suitable for the measurement of high-temperature fluid flow and can be used to measure high-temperature liquids, steam and gases. The steel and structure it is used to manufacture must be compatible with the temperature and pressure of the high-temperature fluid to be measured. The advantages of differential pressure flowmeter are: the most widely used orifice plate flowmeter, simple and firm structure, stable and reliable performance, long service life; wide application range, so far no other type of flowmeter can be compared with it; The transmitter and the display instrument are produced by different manufacturers respectively, which is convenient for the production of economies of scale. The disadvantages of differential pressure flowmeters are: the measurement accuracy is generally low; the measurement range is narrow, generally only 3:1-4:1; the on-site installation conditions are high (sufficient straight pipe length for upstream and downstream, etc.); large pressure loss (referring to orifice plates, nozzles, etc.). Application overview of differential pressure flowmeter: Differential pressure flowmeter has a wide range of applications. In the flow measurement of closed pipelines, various objects have applications. In terms of fluid, there are single-phase, mixed-phase, clean, dirty, viscous flow, etc.; in terms of working conditions, there are normal pressure, high pressure, vacuum, normal temperature, high temperature, low temperature, etc.; in terms of pipe diameter, it can range from several millimeters (mm) to several meters (m ); flow conditions include subsonic, sonic, pulsating flow, etc. Its usage in various industrial sectors accounts for about 1/4-1/3 of the total usage of flowmeters.

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