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What is an electromagnetic flow meter and how does it work?

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Electromagnetic flowmeter is a type of flowmeter that measures the flow rate of fluids using a transmitter and a sensor. This type of flowmeter has a sensor inside the pipe that determines the induced voltage created by the fluid as it passes through. The sensor’s voltage is received by the transmitter portion, which turns it into flow rate. The control system is then informed of the measured flow rate. A pair of coils and a pair of electrodes are used in an electromagnetic flowmeter to measure the flow rate. The current produced in the transmitter excites the coils. Between the two coils, an electromagnetic field is produced as soon as the gadget is functional.

 

The force of this electromagnetic field divides the positive and negative components of the moving fluid when the tube is filled with fluid and the fluid starts to flow. An induced voltage results between the electrodes as a result of this activity. The principle of Faraday’s law of induction serves as the foundation for the flow measuring concepts applied to electromagnetic flowmeters. According to this law, the speed of the fluid moving through the electromagnetic field directly affects the induced voltage. Using electrodes, this generated voltage passes on to the transmitter. This voltage is then converted to speed by the transmitter. Two variables—the fluid velocity and the pipe area—are used to calculate the fluid’s volume flow rate. Electrical liquids with conductivities more than 5 S/cm can use this type of flowmeter. The magnetic flowmeter has numerous benefits over ultrasonic and mechanical flowmeters.

Its benefits include the capability to measure two-way flow, extremely high measurement accuracy in comparison to other flowmeters (0.5%), the ability to operate in extreme cold and heat (-40 to +130 °C), the absence of pressure reduction before and after the flowmeter, and its high corrosion resistance and versatility in installation. Electromagnetic flowmeters have high accuracy (±0.5%). Due to the lack of moving parts and consequent lack of influence on liquid flow, this great accuracy is possible. These flowmeters have an entirely open flow route, and because there is no difference in pressure before or after the flowmeter, they are appropriate for applications where pressure reduction is crucial, like energy-saving systems. Electromagnetic flowmeters also offer a strong resistance to corrosion and other chemical conditions because there are no iron pieces in direct contact with the material. Electromagnetic flowmeters can measure fluid flow in both directions, in contrast to other flowmeters that can only measure flow in one direction. This feature is appropriate for locations where the water flow fluctuates, such as oil refineries, where the flow must be reversed for a predetermined amount of time to preserve the system’s health. Electromagnetic flowmeters may function in the -40 to +130 °C temperature range with the right choice of lining materials. Magnetic flowmeters are used in many sectors and have a wide range of applications. They can be used to measure the flow of chemicals in a chemical refinery, water in a pipeline, or chemicals in a municipal water supply system.
* Flow rate: the amount of volume or mass of the passing fluid in relation to time