Advantages and disadvantages of electromagnetic flowmeter

Case introduction

　　Electromagnetic flowmeter is based on Faraday's law of electromagnetic induction to measure the volume flow of conductive media in the pipe inductive instrumentation. Electromagnetic flowmeter in the pipe on both sides of a magnetic field, the measured medium flows through the pipe on the cutting of magnetic lines of force, in the two detecting electrodes on the induced potential, the size of which is proportional to the speed of movement of the fluid.

　　The advantages of electromagnetic flowmeter are:

　　1, electromagnetic flowmeter can be used to measure industrial conductive liquid or slurry.

　　2, no pressure loss.

　　3, large measuring range, electromagnetic flow transmitter calibre from 2.5mm to 2.6m.

　　4, electromagnetic flowmeter measures the volume flow rate of the measured fluid under the working condition, the measurement principle does not involve the influence of the temperature, pressure, density and viscosity of the fluid.

　　The disadvantages of electromagnetic flowmeter are:

　　1, electromagnetic flowmeter applications have certain limitations, it can only measure the liquid flow of conductive media, can not measure the flow of non-conductive media, such as gas and water treatment of better heating water. In addition, its lining needs to be considered under high temperature conditions.

　　2, electromagnetic flowmeter is by measuring the speed of conductive liquids to determine the volume flow rate of the working state. In accordance with the measurement requirements, for liquid media, should measure the mass flow rate, the measurement of media flow rate should be involved in the density of the fluid, different fluid media has a different density, and with the temperature change. If the electromagnetic flowmeter converter does not take into account the fluid density, only to give the volume flow rate at room temperature is not appropriate.