What are the aspects of electromagnetic flow meter routine inspection?
Electromagnetic flowmeters usually include electrode contact resistance, polarization voltage of the electrode, signal cable interference, determination of the ground potential, and the stray current flow in the pipe.
First, the electrode contact resistance measurement Measuring electrode spoon liquid contact resistance value, can not indirectly discharge the flow sensor from the pipe and indirectly estimate the surface of the juice electrode and the lining layer, help to analyze the cause of the fault.
Second, the polarization of the electrode voltage measurement Polarization voltage between the electrode and the liquid will help determine whether the zero point instability or output sloshing caused by the electrode is contaminated or covered. With the digital multimeter 2V DC gear, measure the polarization voltage between the two electrodes and the ground (the electromagnetic flowmeter can be measured without interruption or blackout ) . 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 nature of the liquid. The measured value may be between a few mV and a few hundred mV . Because the two electrodes are actually contaminated during operation, it is not possible to be completely symmetrical, so the voltage across the two electrodes forms an asymmetric common-mode voltage. The asymmetric common-mode voltage becomes a differential mode signal, causing a zero offset.
Third, the determination of signal cable interference Signal cable by the external electrostatic induction and electromagnetic induction interference will make electromagnetic flowmeter zero changes. To determine whether the zero point change is due to signal cable interference potential influences, it is necessary to determine the general scope of the interference and the degree of influence on the electromagnetic flowmeter.
Fourth, determine whether there is ground potential electromagnetic flow juice in the normal use of the process, such as sensor near the electric ( force ) machine status changes ( such as leakage ) , ground potential will change and cause zero changes. Check if there is any influence in this way. Short circuit the converter's working ground C terminal and protective grounding G terminal, and judge whether there is a grounding potential by changing the zero point ( or indication value ) .
V. Distinguishing the stray current flow of the pipeline Sometimes the disturbance source for finding the spurious of the pipeline is still at the downstream of the flow sensor to narrow down the search range and try to reduce or eliminate the influence of stray current interference. 
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