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Solve electromagnetic flowmeter failure to detect the five aspects of the test

by:KAIDI     2020-07-15
Electromagnetic flowmeter in use process will produce some faults affect the normal work of the instrument, how in the back of a failure to find reasons is a very important work, we need through a variety of different types of testing methods to identify, in general, our regular testing for electromagnetic flowmeter, usually including electrode contact resistance, polarization of electrode voltage, signal cable interference, to determine whether grounding potential and pipeline stray current flow to the five aspects, the five aspects can be independently and are interconnected, none of these factors changes are likely to cause changes in other vendor, this remind you should pay special attention: when testing a, electrode measuring contact resistance, electrode contact with the liquid resistance, can be not discharged from the pipe flow sensor and indirect estimation juice electrode and the lining layer surface general situation, help to analysis the cause of the problem. Measuring electrode contact with the liquid resistance, can be not discharged from the pipe flow sensor and indirect assessment of electrode and lining layer surface conditions generally, help to analysis the cause of the problem. Especially for large diameter electromagnetic flowmeter brings very much convenience to check. This method can estimate the flow sensor measurement of tube surface condition, such as the electrodes and the lining layer of sediment, sediment is the electrical conductivity or insulation properties, electrode surface pollution condition. 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 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 depends on the electrode materials & quot; Electrode potential & quot; 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 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. Four, determination of presence of grounding potential electromagnetic flow juice during normal use, such as sensors electricity (near Force) Machine status 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 discriminant sometimes for pipeline stray current flow pipelines stray interference sources in the flow sensor also in downstream, upstream to narrow your search, try to reduce or eliminate stray current interference effects. ( Instrument science and technology in this paper by embellish release, if you encounter any problems in the process of using the instrument, can call our domestic sales service hotline: 0517 - 86917118, we have * * personnel unriddling for you)
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