Flow meters and flow instruments are widely used. Whether at home or abroad, they are developing very rapidly and cover almost most industrial markets.
Flow meters and flow instruments are widely used. Whether at home or abroad, they are developing very rapidly and cover almost most industrial markets. Flow meters are used in food, medical, steel, chemical industry, pharmaceuticals, etc. . Intelligent electromagnetic flowmeter is a flow measurement instrument that is manufactured according to the law of electromagnetic induction and is used to measure the volume flow of conductive liquids in pipelines, such as water, sewage, mud, mineral slurry, acid, alkali, salt liquids and food slurries. It is widely used in petrochemical, coal, drainage, sewage treatment and other industries.
We all know that when measuring gas or liquid media doped with a large amount of gas, we will not choose an electromagnetic flowmeter, but a vortex flowmeter or turbine flowmeter.
Electromagnetic flowmeter is a volume flow measurement instrument. During the measurement process, it is not affected by the temperature, viscosity, density and conductivity (a certain range) of the measured medium. Therefore, the electromagnetic flowmeter can be used to measure the flow of other conductive liquids only after being calibrated with water.
The output of the electromagnetic flowmeter is only proportional to the average flow velocity of the measured medium, and has nothing to do with the flow state (laminar flow or turbulent flow) under symmetrical distribution. Therefore, the electromagnetic flowmeter has a wide range and its measurement range is The range can be up to 100:1 or even 150:1. The electromagnetic flowmeter mainly measures the flow of conductive media with a conductivity greater than 5 μs/cm. Gas is not conductive, so it cannot be measured.
This situation is mainly due to the inherent shortcomings of the electromagnetic flowmeter itself. Electromagnetic flow meters cannot be used to measure gases, steam, and liquids containing a large amount of gas; they cannot be used to measure liquid media with very low conductivity, such as petroleum products or organic solvents.
The working characteristics of electromagnetic flowmeter measurement:
1. The electromagnetic flowmeter has no mechanical inertia and is sensitive in response. It can measure instantaneous dynamic flow, and can also measure flow in both forward and reverse directions. . Industrial electromagnetic flowmeters have a wide diameter range, from a few millimeters to several meters, and have built-in real-flow calibration equipment, which lays the foundation for the application and development of electromagnetic flowmeters.
2. The sensor structure of the electromagnetic flowmeter is simple. There are no movable parts in the measuring tube, and there are no throttling parts that hinder the flow of fluid. Therefore, when the fluid passes through the flow meter, it will not cause any additional pressure loss. It is the most energy-consuming flow meter in the flow meter. It can measure the flow rate of dirty media, corrosive media and suspended liquid-solid two-phase flow. This is because there are no flow-impeding parts inside the measuring tube of the instrument. What is in contact with the measured fluid is the lining of the measuring tube, and its material can be selected according to the properties of the measured fluid. For example, using polytrifluoroethylene or polytetrafluoroethylene as the lining can measure various acids, alkalis, salts and other corrosive media; using wear-resistant rubber as the lining, it is suitable for measuring materials with solid particles and large wear. Liquid-solid two-phase flow such as mineral slurry and cement slurry, as well as various fibrous liquids and suspended liquids such as paper pulp.
Hangzhou Economic Development Area，Hangzhou 310018，China
