Advantages and disadvantages of electromagnetic flowmeter

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Advantages and disadvantages of electromagnetic flowmeter




Electromagnetic flowmeter is a new type of flow measuring instrument developed rapidly with the development of electronic technology in the 1950s and 1960s. The electromagnetic flowmeter is a meter that is based on Faraday's law of electromagnetic induction and is used to measure the volumetric flow of conductive liquid. Due to its unique advantages, it has been widely used in the flow measurement of various conductive liquids in industrial processes, such as corrosive media such as various acids, alkalis, salts, etc.; various slurry flow measurement has formed a unique application field.


Structurally, the electromagnetic flowmeter consists of an electromagnetic flow sensor and a converter. The sensor is mounted on an industrial process pipe. Its function is to linearly convert the liquid volume flow value flowing into the pipe into an induced potential signal and send this signal to the converter through the transmission line. The converter is mounted not far from the sensor, it amplifies the flow signal sent by the sensor and converts it into a standard electrical signal output proportional to the flow signal for display, accumulation and regulation control.


The main advantages of electromagnetic flowmeters are as follows:


1) The sensor of the electromagnetic flowmeter has a simple structure, and there are no movable parts in the measuring tube, and there are no throttling parts that hinder the flow of the fluid. Therefore, when the fluid passes through the flowmeter, it does not cause any additional pressure loss, and is one of the flowmeters with the lowest energy consumption in the flowmeter.


2) The flow rate of the smear medium, the corrosive medium and the suspended liquid-solid two-phase flow can be measured. This is due to the fact that there is no obstructed flow component inside the metering tube. Only the measuring tube lining and the electrode are in contact with the fluid to be measured, and the material can be selected according to the nature of the fluid to be measured. For example, polytrifluoroethylene or polytetrafluoroethylene can be used as a lining to measure corrosive media such as various acids, alkalis, and salts. The use of wear-resistant rubber as the inner liner is particularly suitable for measuring wear with solid particles. Larger slurry, cement slurry and other liquid-solid two-phase flow and various suspended liquids such as fiber liquid and pulp.


3) Electromagnetic flowmeter is a volume flow measuring instrument. During the measurement process, it is not affected by the temperature, viscosity and density of the measured medium (in a certain range). Therefore, the electromagnetic flowmeter can be used to measure the flow rate of other conductive liquids only after being calibrated by water.


4) The output of the electromagnetic flowmeter is only proportional to the average flow velocity of the measured medium, and is independent of the flow state (laminar or turbulent flow) under a symmetric distribution. Therefore, the electromagnetic flowmeter has an extremely wide measuring range, and its measuring range can reach 100:1, and some even reach a running flow range of 1000:1.


5) The electromagnetic flowmeter has no mechanical inertia and is sensitive to the reaction. It can measure the instantaneous pulsating flow rate and also measure the flow in both the positive and negative directions.


6) Industrial electromagnetic flowmeters have a wide range of diameters from a few millimeters up to several meters, and there are existing flow calibration devices with a diameter of 3m in China, which lays a foundation for the application and development of electromagnetic flowmeters.


The main shortcomings of electromagnetic flowmeters still exist as follows:


1) Cannot be used to measure gases, vapors, and liquids containing large amounts of gas.


2) It cannot be used to measure liquid media with low conductivity. For example, for petroleum products or organic solvents, electromagnetic flowmeters are currently unable to do anything.


3) Ordinary industrial electromagnetic flowmeters cannot be used to measure high temperature media due to the limitations of measuring tube lining materials and electrical insulating materials; if they are not specially treated, they cannot be used for the measurement of low temperature media to prevent condensation on the outside of the measuring tube. (Frost) destroys insulation.


4) The electromagnetic flowmeter is susceptible to external electromagnetic interference.






Tips: Bo Rui Instrument is a professional manufacturer and seller of instrumentation, which can provide you with electromagnetic flowmeter, vortex flowmeter, turbine flowmeter, throttling device and other flow meters; ultrasonic level gauge, magnetic flap level Meters, radar level gauges and other liquid level meters; pressure transmitters, differential pressure transmitters and other pressure instruments; thermocouples, thermal resistance and other temperature instruments and other products production and sales, international brand instrumentation agents, automation control engineering, etc. Products, welcome new and old customers to visit, Henan Bo Rui Instrument Co., Ltd. with the highest quality and most comprehensive after-sales service, welcome you.
For more exciting information, please see the electromagnetic flowmeter news information of this site. Keywords: vortex flowmeter; electromagnetic flowmeter; turbine flowmeter.
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