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When two or more liquids are used as the pipeline mixing process, if the conductivity of the two liquids (or their respective electrode chapter potentials) is different, the flow sensor will enter the flow measurement before the mixing is not uniform, and the output signal will also fluctuate.
Low-frequency (50/16~50/6Hz) rectangular excitation electromagnetic flowmeters measuring liquids containing solids above a certain level will produce slurry noise, and the output signal will also fluctuate to some extent.
The poor matching of the electrode material and the measured medium produces chemical actions such as passivation or oxidation. The formation of an insulating film on the surface of the electrode, as well as electrochemical and polarization phenomena, will interfere with normal measurement.
Pipeline systems and installations are usually faults caused by improper installation of electromagnetic flowmeter sensors. Commonly, flow sensors are installed at the high point of pipe network where accumulation of entrapped gas is common; back pressure is applied to the flow sensor and the liquid is discharged directly into the atmosphere. The formation of its non-full pipe inside the measuring tube; mounted on the vertical pipe from top to bottom, there may be emptying and other reasons.
The environmental aspects of the electromagnetic flowmeter are mainly the stray current disturbance of the pipeline, the interference of space electromagnetic waves, and the magnetic interference of large electrical machinery. The stray current interference of the pipeline is usually obtained by taking good individual grounding protection to obtain a satisfactory measurement, but if there is a strong stray current in the pipeline (such as a pipeline in the electrolysis workshop), it may not be overcome, and the measure of insulation between the flow sensor and the pipeline must be adopted. Space electromagnetic interference is usually introduced via signal cables. Usually single-layer shielding is used for protection. However, shielding protection has not yet been overcome.
Electromagnetic Flowmeter
Electromagnetic flowmeters for measuring fluids if the liquid contains evenly distributed fine air bubbles do not normally affect normal measurements. However, when the measured volumetric flow is the sum of both liquid and gas, the output signal fluctuates due to the increase of air bubbles, if the air bubbles are large enough to flow. The over-electrode covers the entire surface of the electrode so that the electrode signal circuit is instantaneously disconnected and the output signal will generate more fluctuations. For two or more liquids mixed working <br> <br> conduit fluidically <br> <br> electromagnetic flowmeter electromagnetic flowmeter in the measuring liquid is generally uniformly distributed fine air bubbles do not affect the normal measurement, but the measured volume When the flow rate is the sum of both liquid and gas, the output signal fluctuates due to the increase of air bubbles. If the air bubble is large enough to flow over the electrode to cover the entire surface of the electrode, the electrode signal loop will be instantaneously disconnected, and the output signal will fluctuate more.