Requirement of Electromagnetic Flow Meter for Liquid Conductivity

Abstract: The information on the requirements of electromagnetic flowmeters for liquid conductivity is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. The premise of using electromagnetic flowmeter is that the liquid to be measured must be conductive and cannot be lower than the threshold (ie lower limit). If the conductivity is lower than the threshold value, it will cause measurement error and cannot be used. If it exceeds the threshold value, it can be measured even if it changes. The indication error does not change much and is universal. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the requirements of electromagnetic flowmeters for liquid conductivity. The premise of using electromagnetic flowmeter is that the liquid to be measured must be conductive and cannot be lower than the threshold (ie lower limit). If the conductivity is lower than the threshold, it will cause measurement error and cannot be used. If it exceeds the threshold, it can be measured even if it changes. The indication error does not change much. The threshold of the universal electromagnetic flowmeter is between 10-4 and× 10-6) between S/CM, depending on the model. The use also depends on the length of the flow signal line between the sensor and the converter and its distributed capacitance. The manufacturer's instruction manual usually specifies the length of the signal line corresponding to the conductivity. Meters with non-contact capacitively coupled large-area electrodes can measure conductivity as low as ( 5× 10 -8 ) S/CM liquid. The conductivity of industrial water and its aqueous solution is greater than 10 -4 s / cm , and the conductivity of acid, alkali and salt solution is 10 - 4 ~ 10 -1 s / cm There is no problem in use , 10 -5 s/cm for low-distilled water is no problem. Petroleum products and organic solvents cannot be used if the electricity rate is too low. It is found from the data that some pure liquids or liquids have low conductivity and are considered unusable. However, in actual work, there will be instances where they can be used because they contain impurities. Impurities are beneficial to increase the conductivity. For the aqueous solution, the conductivity in the data is measured in the laboratory with pure water. The actual aqueous solution may be proportioned with industrial water, and the conductivity will be higher than the one found, which is also beneficial for flow measurement. There is also a liquid that cannot be measured by the electromagnetic flowmeter installed on the pipeline in the absence of ready-made conductivity data, but it is considered usable by taking samples from the field pipeline and going offline to the laboratory to measure its conductivity with a conductivity meter. This is because the liquid measured in the offline process of sampling has been different from that in the pipeline. For example, the liquid has absorbed CO2 or NOx in the atmosphere to generate a trace amount of carbonic acid or nitric acid, which has changed the conductivity. According to experience, the actual liquid conductivity is preferably at least an order of magnitude greater than the threshold specified by the instrument manufacturer. Because the lower limit specified by the manufacturer's instrument specification is the lowest value that can be measured under various conditions of use, it is limited by some conditions of use, such as conductivity uniformity, connecting signal lines, external noise, etc., otherwise it will appear Output shaking and so on. We have encountered many times the measurement of low-distilled or deionized water with conductivity close to the threshold 5× 10 -6 s/cm , the output wobbles when used. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Requirements of Electromagnetic Flow Meters for Liquid Conductivity'

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