The selection and application of flow meter scale

Abstract: the selection and application of meter scale information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. 1 meter types and characteristics of the fluid exists widely in the nature of common all belong to the fluid such as air, water and blood. Per unit time, the fluid flows through a pipe or equipment somewhere in the number of cross section is called flow. The flow measurement is a very complicated work,. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the selection and application of meter scale article details. 1 meter types and characteristics of the fluid exists widely in the nature of common all belong to the fluid such as air, water and blood. Per unit time, the fluid flows through a pipe or equipment somewhere in the number of cross section is called flow. Flow measurement is a very complicated work, as for a fluid object, there are all kinds of liquid, gas, and multiphase flow. When measuring condition difference is very big also, the flow measurement of fluid temperature range can be from high to low temperatures and extremely low temperature; Pressure range can be from ultra-high pressure to low pressure; Flow range can be arrogant flow to small flow; Viscosity range can be from low viscosity to high viscosity; With laminar and turbulent flow range, pulsating flow and multiphase flow pattern. As measured in the concrete, therefore, should be based on objects and all kinds of measurement conditions, adopt corresponding flow measurement method. Measurement of fluid flow meter are collectively referred to as flowmeter. A wide range of flow measurement method and instrument, its measurement principle, structure characteristics, applicable scope and method of use is different. So far, for up to 60 varieties in industrial flow meter. Varieties because so many have yet to find a kind of any fluid, any range, any flow state and any conditions of use are applicable flow meter. There are many means the classification of the flowmeter, in principle can be divided into differential pressure flowmeter, the volumetric flowmeter, the speed type flowmeter and mass flowmeter, etc. This article will choose differential pressure flowmeter, displacement meter, flow meter, turbine flowmeter, electromagnetic flowmeter, vortex flowmeter to respectively in this paper, the principle and characteristics. 1. 1 differential pressure flowmeter differential pressure flowmeter is static pressure difference generated by the application of fluid flow through the throttle device to measure the flow rate of a meter. By testing a differential pressure type flowmeter ( A device) Line and the differential pressure gauge, differential pressure signal ( Secondary device) Composition, also called orifice flowmeter, it is currently zui widely used type of flowmeter. Usually use classification of differential pressure flowmeter throttle device, such as orifice meter, venturi tube flowmeter and nozzle, etc. , throttling device has been standardized, known as the standard throttle device. Secondary device for a variety of mechanical, electronic, mechanical and electrical one-piece differential pressure gauge, differential pressure transmitter and flow display instrument. It has developed into three ( Seriation, generalization and standardization) Degree is high, type specification of confused one kinds of instrument, it can measure flow parameters, also can measure other parameters, such as pressure, level, density, etc. Differential pressure type flowmeter test according to the principle can be divided into: the throttle device, hydraulic resistance type, centrifugal, dynamic head type, type and fluidic dynamic pressure head gain six categories. Differential pressure flowmeter is a kind of flow meter, zui widely applied in all kinds of flow meters in its usage occupy the first place. In recent years, due to various kinds of new type flowmeter, its usage is falling, but it is still an important class of flowmeter zui, suitable for high temperature measurement of fluid flow, can be used to measure the high temperature liquid, steam and gas, but the manufacturing of steel and structure must be and adapt to high temperature and pressure of the fluid being measured. Differential pressure flowmeter advantages as follows: application zui orifice plate flowmeter, simple structure and firm, stable and reliable performance, long service life; Broad application range, so far there is no any kind of flowmeter, which can be compared to; Test pieces with transducer and display instrument respectively produced by different manufacturers, is advantageous for the economy of scale production. Differential pressure type flowmeter for disadvantage: measurement accuracy is generally low; Narrow measuring range, general 3-1 - only 4-1. On site installation requirements ( Length of straight pipe upstream and downstream should be long enough, etc. ) ； The pressure loss ( Refers to the orifice, nozzle, etc. ) 。 Differential pressure type flowmeter application: application scope is widespread, differential pressure type flowmeter in flow measurement in a closed pipe, all kinds of objects are used. Has single-phase fluid, miscible, clean, dirt and viscous flow, etc. ; Working condition with normal pressure and high pressure, vacuum, normal temperature, high temperature, low temperature, etc. ; Can range from a few millimeters in diameter, mm） To a few meters ( m） ； Has subsonic flow conditions, the speed of sound, pulsating flow and so on. In the amount of each industrial sector accounted for about a quarter of the dosage of flowmeter all - A third. 1. 2 volumetric flowmeter volumetric flowmeter is also called fixed displacement meter, referred to as 'PD flowmeter, the flow meter is of high precision zui. Volumetric flowmeter principle is to use mechanical measuring element to divide fluid continuously into the volume of a single known part, according to the measuring chamber of successive repeatedly the number of full of emissions and the volume of fluid to measure the total fluid volume. Volumetric flowmeter, numerous forms should be based on the current body of flow range, temperature, pressure, selection of pipe diameter used, corrosion resistance and viscosity.

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