LDE-65 electromagnetic flowmeter mixed into a bubble flow of tiny bubbles can still work normally, but the measured volume of mixed volume flow containing bubbles.
LDE-65 electromagnetic flowmeter mixed into a bubble flow of tiny bubbles can still work normally, but the measured volume of mixed volume flow containing bubbles; such as gas content increased to form a bullet (block) flow, because the electrodes may be covered by the gas so that the circuit is instantly disconnected, presenting the output wobble even can not work properly. Such as drilling mud, drilling cementing mud, pulp, etc. is actually a non-Newtonian fluid. Because of the solid in the carrier fluid in China, containing non-ferromagnetic particles or fibres of solid-liquid two-phase fluid can also be measured in two-phase volume flow. Fluids with a higher solid content. There is sliding between the two, there is a difference in speed, single-phase liquid calibration of the instrument for solid-liquid two-phase fluids will produce additional errors. Although not yet seen EMF applied to solid-liquid two-phase fluids in the effect of solids in the system experimental speech, but there are reports from abroad that the solids content of 14% error in the range of 3%; Yellow River Conservancy Commission, Institute of Water Resources Science experiments, said that the measurement of the sand content of the flow of water, the volume of sand than the value of 17% of the sand in the value of the particle size of 0.35mm instrument measurement error is less than 3% The frequency of the rectangle excitation of a low frequency EMF will produce spike-like noise in the slurry, slurry within the larger particles rubbing the electrode surface.
So that the flow signal is unstable, it is necessary to choose a higher frequency instrument or a stronger ability to suppress the noise of the slurry of the instrument, you can also use the AC excitation of the instrument or dual-frequency excitation of the instrument. Will produce measurement error. But in the magnetic circuit with a flux detection coil compensation EMF can reduce the effect of mixed ferromagnets. supmea instrumentation factory in the AC excitation instrumentation of the experimental speech that contains ferromagnetic substances in the fluid to the usual EMF due to the measurement of the magnetic permeability of the pipe by the ferromagnet of the different contents of the change. Water containing liquid-solid weight ratio of about 41 particles ≤ 0.15mm iron ore concentrate slurry, 80mm calibre instrument for water and slurry comparison flow test, the usual instrument value change 7% equipped with magnetic flux detection coil instrument, the display value error within ± 2% FS. Attention should be paid to the level of wear and tear on the sensor lining, the slurry containing ore particles application. The expansion of the inner diameter of the measuring tube will produce additional errors. Such places should be selected with better abrasion resistance of ceramic lining or polyurethane rubber lining, while it is recommended that the sensor device in the vertical pipeline, so that the pipe wear uniformity, eliminating the shortcomings of the lower half of the horizontal device of the serious local wear and tear, but also in the sensor inlet end of the addition of nozzle-shaped sheaths, the relative prolongation of the use of the period of time. lde-65 electromagnetic flowmeter adhesion and sedimentation If attached than the conductivity of the liquid conductivity of the conductive material, the measuring Easily in the pipe wall attachment and precipitation of substances when the fluid.
Signal potential will be short-circuited and can not work control engineering network all rights reserved, if the non-conductive layer should first pay attention to the electrode contamination, such as the choice of not easily attached to the tip-shaped or hemispherical protruding electrodes, interchangeable electrodes, scraper-type scale electrodes and so on. Scraper-type electrode can be outside the sensor to manually scrape out the scale on a regular basis. Foreign products have been installed on the electrode ultrasonic transducer to remove the surface layer of scale, but now rare. There are also temporarily disconnect the measurement circuit, the electrode intermittent time flow through the low-voltage current, incineration to remove the adhesion of grease adhesion layer. Easily attached to the site can increase the flow rate to achieve the purpose of self-cleaning can also take a more convenient and easy to clean the pipeline connection, can not be assembled to clean the sensor. Instrumentation can still work, non-contact electrode EMF attached non-conductive film layer. But if the conductive layer is the same can not work.
Hangzhou Economic Development Area，Hangzhou 310018，China
