The five aspects of electromagnetic flow meter scale special testing

Abstract: the five aspects of electromagnetic flow meter scale special detection information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. A, electrode contact resistance measuring electrode contact resistance, can be not discharged from the pipe flow sensor and indirect estimation and the lining layer electrode surface general situation, help to analysis the cause of the problem. This is especially for large diameter electromagnetic flow juice check bring extremely. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the five aspects of electromagnetic flow meter scale special testing article details. A, electrode contact resistance measuring electrode contact resistance, can be not discharged from the pipe flow sensor and indirect estimation and the lining layer electrode surface general situation, help to analysis the cause of the problem. This is especially for large diameter electromagnetic flow juice brings very much convenience to check. Estimate flow sensor measurement of tube surface condition such as electrode and the lining layer of sediment, sediment is conductivity or insulation properties, electrode surface pollution condition. Electrodes to measure the contact resistance compared with the original measurements have different trends: 1. Two electrode resistance unbalance increase ( The difference value increases) ； 2. Resistance increased; 3. Resistance decreases. The three signs can respectively determine the following may be the cause of the problem: 1. Electromagnetic flow juice electrode parts have a electrode insulation have larger decline; 2. Electrode surface insulation cover; 3. Adhered on the surface of the electrode surface and lining conductive deposits. Above, several kinds of failure probability can be as forecast malfunction of precursors. When using a multimeter to measure pay attention to the following points: 1. Resistance value should be at the instant of the measuring rod contact terminal read pointer deflection zui big value, measured values the proceeds zui the first time shall prevail. As to measurement by polarization measurement value is inconsistent; 2. And two electrode resistance when the grounding end rod must be the same polarity, which USES electric meter measuring poles, the same anode rod electrode, cathode grounding. 3. Measure to use the same model multimeter, and use the same range, commonly used 1. 5 v battery working range measurement. Second, the polarization of electrode voltage measuring electrode polarization voltage between the liquid and 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 flow juice 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 depends on the electrode materials & other; Electrode potential & throughout; 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. Three measurement signal cable, signal cable interference from electrostatic induction and electromagnetic induction interference can make the electromagnetic flow juice 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. Four, determination of presence of grounding potential electromagnetic flow juice during normal use, such as sensors, near motor state changes ( Such as leakage) , grounding potential changes caused by zero change. Check whether have the influence, the converter can be work terminal short circuit, grounding C terminal and protection of G to zero ( Or instruction value) Changes in judgment for ground potential. Five, the pipeline stray current flow to the discriminant sometimes for pipeline stray interference sources in the flow sensor of the upstream or downstream, in order to narrow your search, try to reduce or eliminate stray current interference effects. And pipeline electrical insulation jumper wires and grounding line upstream and downstream from the flow sensor of A and B two points, respectively connected to the ammeter. In A point measured current for 60 maac, point B current is zero, upstream of interference sources in the flow sensor. Electromagnetic flow juice sensor electrode contact resistance should be immediately after the new instrument debugging good, measure and record, every maintenance measure once, after analyzing and comparing these data will help determine instrument the cause of the problem in the future. Electrode contact with the liquid resistance mainly depends on the electrode measured liquid contact with the liquid surface area and conductivity. General structure of the electrodes in measuring conductivity & 5 times; 10 - 6 s/cm distilled water resistance of 350 k ~ Q, conductivity & 150 times; 10 - 6 s/cm's life and industrial water for about 15 ko, conductivity & 1 times; 10 - 2 s/cm brine is about 200 n. When using a multimeter in a liquid measured the resistance between each terminal electrode and ground, experience shows that the contact resistance between the difference should be less than 10% - 20%, otherwise it is faulty. Electrode contact resistance is measured with a multimeter is not correct measuring method of resistance value accurately is to determine the overall value. Accurate measurement must use the bridge, such as & other Kohlraush bridge & throughout; And so on. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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