Can electromagnetic flowmeters measure with mixture liquids?

As a general-purpose flowmeter, can the electromagnetic flowmeter be suitable for all liquids? Today, let's find out whether the electromagnetic flowmeter can measure the liquid mixture called? The prerequisite for the mixture liquid is that it must be conductive before use. The following four media related to the mixture liquid are introduced. During block flow, the electrodes are covered by gas, the circuit may be cut off instantaneously, the output will shake, and it will not function properly (Figure 1). Figure 12. Solid-liquid two-phase flow The solid-liquid two-phase fluid containing non-ferromagnetic particles or fibers can also measure the volume flow of the two phases. Figure 2. Fluids with high solids content, such as drilling mud, drilling cement slurry, paper pulp, etc. Since the solid flows together in the carrier liquid, there is a slip between the two and there is a difference in speed. The instrument used for the single-phase liquid inspection for the solid-liquid two-phase fluid will generate additional errors. When large particles in the slurry rub against the surface of the electrode, a low-frequency rectangular-excited electromagnetic flowmeter generates spike-like slurry noise, and the flow signal becomes unstable. Select a high-frequency meter and suppress slurry noise. capable instrument. Figure 13. Liquids containing ferromagnetic substances Fluids containing ferromagnetic substances For a normal electromagnetic flowmeter, the magnetic permeability in the measuring tube changes according to the content of the ferromagnetic substances, resulting in measurement errors, but by placing a magnetic flux in the magnetic circuit to detect The electromagnetic flowmeter emf compensated on the outside of the line can reduce the influence of the mixing of ferromagnetic substances. The test report shows that the water contains iron concentrate with a liquid-solid weight ratio of about 4:1 and the particle size is less than or equal to 0.15mm. The 80mm diameter meter is used for the comparison flow test of clear water and slurry, and the usual meter indicates that the value changes by 7%-10% , The instrument equipped with the magnetic flux detection coil, the indication error is within ±2%Fs. 4. When the slurry liquid is used to measure the slurry containing ore particles, attention should be paid to the wear degree of the sensor lining, and the expansion of the inner diameter of the measuring tube will cause additional errors. In this case, it is proposed to install the sensor on the vertical piping, while selecting the ceramic lining or urethane rubber lining with good wear resistance, so that the wear of the piping can be uniform, and the part of the lower half of the horizontal installation can be eliminated. Severe wear and tear. The above is the article on the use of electromagnetic flowmeters for four mixture liquids, I hope it will help you.

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