What are the special tests for electromagnetic flow meters

Abstract: What information is provided for the special inspection of electromagnetic flowmeters is provided by excellent flowmeters and flowmeter manufacturers and quotation manufacturers. 1. Electrode contact resistance measurement Measuring the liquid contact resistance value of the electrode spoon can indirectly estimate the general condition of the juice electrode and the surface of the lining layer without removing the flow sensor from the pipeline, which is helpful to analyze the cause of the failure. Second, the electrode polarization voltage measurement electrode and liquid. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the articles on the special inspection of electromagnetic flowmeters. 1. Electrode contact resistance measurement Measuring the liquid contact resistance value of the electrode spoon can indirectly estimate the general condition of the juice electrode and the surface of the lining layer without removing the flow sensor from the pipeline, which is helpful to analyze the cause of the failure. 2. The polarization voltage of the electrode Measuring the polarization voltage between the electrode and the liquid will help to judge whether the failure of the zero point instability or the 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 electrode is not contaminated or covered, otherwise the electrode is contaminated or covered. The magnitude of the polarization voltage is determined by the 'electrode potential' of the electrode material and the properties of the liquid, and the measured value may range from a few mV to several hundreds of 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. Determination of signal cable interference The signal cable is disturbed by external electrostatic induction and electromagnetic induction, which will cause the zero point of the 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. 4. Determination of whether there is a ground potential Electromagnetic flow juice During normal use, if the state of the electric (power) machine near the sensor changes (such as leakage), the ground potential will change and cause zero point changes. To check whether there is such an influence, 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). 5. Discrimination of stray current flow in pipelines Sometimes in order to find the source of stray interference in the pipeline, the upstream and downstream of the flow sensor are enough to narrow the search range and try to reduce or eliminate the interference effect of stray current. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'What are the special inspections of electromagnetic flow meters'
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