Special testing method for electromagnetic flow meter

Abstract: The information on special testing methods for electromagnetic flowmeters is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Electromagnetic flowmeters are widely used in petroleum, chemical, metallurgy, textile, food, pharmaceutical, papermaking and other industries as well as environmental protection, municipal management, water conservancy construction and other fields. The main components of the sensor are: measuring tube, electrode, excitation coil, iron core and yoke shell. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the special detection method of electromagnetic flowmeters. Electromagnetic flowmeters are widely used in petroleum, chemical, metallurgy, textile, food, pharmaceutical, papermaking and other industries as well as environmental protection, municipal management, water conservancy construction and other fields. The main components of the sensor are: measuring tube, electrode, excitation coil, iron core and yoke shell. The product is mainly used to measure the volume flow of conductive liquids and slurries in closed pipes, including acids, alkalis, salts and other highly corrosive liquids. Special detection method of electromagnetic flowmeter: 1. Determination of interference of signal cable The interference of signal cable by external electrostatic induction and electromagnetic induction will cause the zero point of electromagnetic flowmeter to change. In order to determine whether the zero point change is affected by the interference potential of the signal cable, it is necessary to determine the general range of the interference and the degree of influence on the electromagnetic flowmeter. 2. Electrode polarization voltage Measuring the polarization voltage between the electrode and the liquid will help to judge whether the fault of zero point instability or output shaking is caused by the electrode being polluted or covered. Use the 2V DC gear of the digital multimeter to measure the polarization voltage between the two electrodes and the ground respectively (the electromagnetic flowmeter can be measured without power failure or without power failure). If the two measurements are nearly equal, the electrodes are not contaminated or covered. The magnitude of the polarization voltage depends on the“electrode potential”Depending on the properties of the liquid, the measurement may be in the range of a few mV to several hundred mV. Because it is impossible for the two electrodes to be polluted completely and symmetrically during operation, the voltages on the two electrodes form an asymmetric common-mode voltage. The asymmetric common-mode voltage becomes a differential-mode signal, resulting in a zero offset. 3. Discrimination of the stray current flow in the pipeline Sometimes, in order to find the source of stray interference in the pipeline, whether it is upstream or downstream of the flow sensor, in order to narrow the search range and try to reduce or eliminate the influence of stray current interference. 4. Electrode contact resistance Measuring the liquid contact resistance value of the electrode spoon can indirectly evaluate the general condition of the surface of the electrode and the lining layer without removing the flow sensor from the pipeline, which is helpful to analyze the cause of the failure. 5. Determine whether there is ground potential During the normal use of electromagnetic flow juice, if the state of the motor (force) near the sensor changes (such as leakage), the ground potential will change and cause the zero point to change. To check whether there is such an effect, short-circuit the working ground C terminal of the converter and the protective ground G terminal, and judge whether there is a ground potential by the change of the zero point (or indicated value). The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Special detection method of electromagnetic flow meter'

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