Advantages and disadvantages of electromagnetic flowmeter

1. Advantages
(1) The measuring channel of the electromagnetic flowmeter is a smooth straight pipe with no obstruction. Because it is not easy to be blocked, it is suitable for measuring liquid-solid two-phase fluids containing solid particles or fibers, such as paper pulp, coal water slurry, mineral slurry, mud and Sewage etc.
(2) The electromagnetic flowmeter does not produce pressure loss due to the detected flow. The resistance of the instrument is only the resistance along the pipeline of uniform length, which has obvious energy-saving effects. It is most suitable for large-diameter water supply pipelines that require low resistance loss.
(3) The volume flow measured by the electromagnetic flowmeter is actually not significantly affected by changes in fluid density, viscosity, temperature, pressure, and conductivity (as long as it is above a certain threshold).
(4) Compared with most other flow meters, the requirement for front straight pipe section is lower.
(5) The measuring range is large, usually 20:1～50:1, and the optional flow range is wide. The liquid velocity of the full scale value can be selected within 0.5～10m/s.
(6) The caliber range of the electromagnetic flowmeter is wider than other types of flow meters, from a few millimeters to 3m. It can measure positive and negative bidirectional flow, and also can measure pulsating flow, as long as the pulsating frequency is much lower than the excitation frequency. The meter output is linear in nature.
(7) It is easy to select the material variety of the parts in contact with the fluid, and can be applied to corrosive fluids.
2.Disadvantages
(1) The electromagnetic flowmeter cannot measure liquids with very low conductivity, such as petroleum products and organic solvents. Cannot measure gas, steam and liquid with more and larger bubbles.
(2) General electromagnetic flowmeters cannot be used for high temperature liquids above 200 degrees due to the limitation of lining materials and electrical insulation materials; at the same time, they cannot be used for mediums with too low temperature, which are damaged by condensation (or frost) outside the measuring tube. insulation.