Basis for Online Calibration of Intelligent Electromagnetic Flow Meter

Abstract: The basis information for the online calibration of the intelligent electromagnetic flowmeter is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. 1. Basis for online calibration of electromagnetic flowmeters Intelligent electromagnetic flowmeters are instruments made by Faraday's law of electromagnetic induction to measure the volume flow of conductive liquids. The whole instrument consists of two parts: sensor and converter, and its measurement principle is shown in Figure 1. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the basis for the online calibration of intelligent electromagnetic flowmeters. 1. Basis for on-line calibration of electromagnetic flowmeters Intelligent electromagnetic flowmeters are instruments made by Faraday's law of electromagnetic induction to measure the volume flow of conductive liquids. The whole instrument consists of a sensor and a converter. The measurement principle is shown in Figure 1. The conductive liquid flows in the non-magnetic measuring tube perpendicular to the magnetic field, and an induced electromotive force proportional to the flow is generated in the direction perpendicular to the flow direction. Its value is as follows: E = kBLe (1) where: E—Induced electromotive force, that is, flow signal; k—coefficient; B—Magnetic induction intensity; Le—measure the distance between electrodes;—average flow rate. In the measuring tube, the volume flow rate of the liquid passing through the cross section is: (2) where: D—Measure the inner diameter of the tube. Combine formulas (1) and (2) to get: (3) where: K—The calibration factor, K, is usually obtained by wet calibration in the factory laboratory. It can be seen from formula (3) that qv and E have a linear relationship. Therefore, only by measuring B, the linear relationship between qv and E can be obtained, that is, the electromagnetic flowmeter can be calibrated online. During the specific calibration, the precision measurement of the electromagnetic flowmeter is obtained by measuring the basic characteristic parameters of the electromagnetic flowmeter. 2. Intelligent electromagnetic flowmeter Online calibration method When the electromagnetic flowmeter leaves the factory, its accuracy is already calibrated by the calibration line. However, in the field of use, due to environmental conditions, fluid characteristics, and the instrument itself, such as damage to components, etc., it is necessary to perform a routine on-site calibration for the flowmeter after long-term use. Since the sensor of the electromagnetic flowmeter is installed on the pipeline, it is difficult to remove it and send it to the calibration line for inspection. At present, within the flow measurement range, the state and local governments do not have regulations and other regulations for online inspection of large-diameter flowmeters under field conditions. document. In order to ensure the accuracy and reliability of the electromagnetic gpi flowmeter after fault repair and long-term use, without affecting daily production, the following online calibration methods are listed below: 1. Conduct a safety insulation test on the electromagnetic flowmeter excitation coil , should be greater than 20MΩ. 2. The copper resistance test of the excitation coil of the electromagnetic flowmeter should be the same as the original factory value (when the ambient temperature is the same). 3. Test the electrode-to-ground resistance of the electromagnetic flowmeter sensor. If the resistance value is between 2 and 20kf, accompanied by charging and discharging, and the resistances of the two electrodes are similar, it is considered good. 4. Test the excitation current of the electromagnetic flowmeter converter, observe the value of its output and the original current of the converter, and the error does not exceed ±0.25mA. 5. Test the analog output and frequency output of the electromagnetic flowmeter converter, observe the linear change, and calculate the maximum linear error, which should not exceed ±0.5%. 6. For electromagnetic flowmeters above DN 1200mm, the push-level NB should be tested, and the current error should not exceed 12mA. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Basis for Online Calibration of Intelligent Electromagnetic Flow Meter'

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