The determination of the electrode polarization voltage electromagnetic flow meter scales

Abstract: the electromagnetic flow meter scale electrode polarization voltage measurement information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Electromagnetic flowmeter to measure polarization voltage between electrodes and the liquid will help to judge whether the fault of the unstable zero or output shaking caused by electrode is covered by pollution or. With 2 v dc digital multimeter, respectively measure the polarization between the two electrodes and ground voltage ( 。 More flow meter manufacturers choose model price quote you are welcome to inquire, here is the electromagnetic flowmeter scale measurement of polarization of electrode voltage article details. Electromagnetic flowmeter to measure polarization voltage between electrodes and the liquid will help to judge whether the fault of the unstable zero or output shaking caused by electrode is covered by pollution or. With 2 v dc digital multimeter, respectively measure the polarization between the two electrodes and ground voltage ( Electromagnetic flowmeter can not power, power measurement) 。 If two measured values closer to nearly equal, the electrode not contaminated or overwritten, electrode contaminated or otherwise be overwritten. Polarization voltage size is decided by the 'electrode potential of electrode material and the properties of the liquid measurements may be between a few mV to a few hundred mV. Because, in fact, in the operation of the two electrodes contamination situation can't be exactly the same symmetry, then the voltage on the electrode formed asymmetric common-mode voltage. Asymmetry of the common-mode voltage becomes differential mode signal, zero offset. By the determination of signal cable interference signal cable electrostatic induction and electromagnetic interference can make electromagnetic flowmeter zero change. To determine whether changes in zero due to the effect of electric potential signal cable interference, to determine the influence degree of the interference range and the electromagnetic flowmeter. In figure 7 10 and above 'electrode contact resistance measurements of two electrodes can be measured by the gross resistance RA, RR, according to the figure of a and b respectively the difference between the measured by zero access circuit should be the full value or its basic error within 1%. Determine the following points should be paid attention to when: 1, should pay attention to access RA and RB not induced by power supply interference; 2, the determination of the converter zero compared with the original wire connector measurement may change a little ( Usually a rise) , it is commonly believed no more than to change it is ok to around 5%; 3, 7, - 10 only draw again change part of the circuit, the other is still in the same line; 4, determination of sensor environment as much as possible and when a failure occurs, such as motor can be power on and off near test would be even better. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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