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(1) Normal installation of electromagnetic flow sensors, such as piping systems, is not properly installed. Common flow sensors, for example, are installed on a network of natural gas pipelines that are easy to accumulate and retain; the flow sensors do not have any pressure, and the liquid directly drains the atmosphere to form a complete atmosphere. The measuring tube; mounted in the empty due to the vertical line may appear empty, the installation of the flow meter is special because of the potential underwater to ensure that there is no float.
(2) Spurious current interference in the main pipeline of the environment, electromagnetic interference from space, large-scale magnetic field disturbances, etc. Normally, good ground protection can be used to obtain satisfactory individual measurements, but there is strong stray current in the case tube. (such as the electrolysis workshop assembly line) can not be overcome, should take the unique measures of the flow sensor and piping edge. Introduction of electromagnetic wave-space signal cable, usually single or multiple shielded protection, but also encountered shielding protection can not be overcome. Split-type electromagnetic flowmeters (3) Liquid fluids containing microbubbles are generally evenly distributed and do not affect normal measurements. Only volumetric flow combines liquid with gas; air bubbles increase output signal fluctuations if large bubbles cover the entire flow through the electrode surface , Make the signal of the electrode break the circuit instantaneously, the output signal will produce greater fluctuations.
Low-frequency (50/16hz-50/6 Hz) rectangular-wave excitation split magnetic flowmeters produce noise when the liquid contains solids exceeding a certain amount of slurry, and the output signal also has a certain degree of fluctuation.
Analysis of Fault during Commissioning of Split Electromagnetic Flowmeter
Split-type electromagnetic flowmeter is a very commonly used measuring flow element in industrial production, which has important significance for industrial production. At present, split electromagnetic flowmeters are widely used in various industrial productions, and the effect of measuring the flow rate is very significant. This article will briefly describe the failure analysis of Huaning split electromagnetic flowmeter during commissioning.