How to found by measuring the electrode contact resistance of electromagnetic flow meter

by:Kaidi Sensors     2020-09-28
Electromagnetic flowmeter has many aspects need to be aware of when using, such as electromagnetic flowmeter product selection, installation position and installation requirements, operation parameter Settings, and so on many aspects of knowledge. Every instrument operators only fully mastered the knowledge and skills, to do at work, in case of failure will be in an orderly way, deliberately to find the cause. We know that electromagnetic flowmeter is high precision, high reliability and long service life of flow meter, so in the design of product structure, material selection, process, production assembly and the factory testing of every link in the process of we are all very careful exquisite. The determination of electromagnetic flowmeter signal cable interference signal cable 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. Electromagnetic flowmeter is its measuring range than spake, than the vortex street flowmeter and the differential pressure type flowmeter are higher, but it is also limited, users in the selection stage, and it often water meter, for its very low velocity of the medium is no problem, actually otherwise, electromagnetic flowmeter for flow velocity or have certain requirements, in general, it can only measure 0. 1m/s. , if less than that are difficult to correctly measure the velocity of electromagnetic flow meter, so the user at the beginning of the product selection and product orders will need to have a correct understanding on this. With order good don't want to order according to the original pipe size, proposal according to your actual flow meter diameter. We know that the electromagnetic flowmeter is a very good performance of flow meter, play a role in many fields of industrial measurement. The flow measurement of large and medium-sized site if lack of electromagnetic flowmeter is almost impossible, so it is necessary to understand the product performance and technical parameters, application for proper operation after there must be a great help. Electromagnetic flowmeter problem found by measuring the electrode contact resistance: electrode is the core parts of the meter is used to measure the signals produced by liquid medium, the electrode contact resistance measuring electrode spoon liquid contact 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. Electrode polarization voltage measurement of 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 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. Only grasp the knowledge, can we do for the instrument to find the cause of the problem. Here we again for you about how to found the instrument by measuring the dislocated ground potential problems, 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. Pipeline stray current flow to the discriminant sometimes for 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. Electromagnetic flowmeter while reliability is better, in general will not damage, but because of its principle, the sensor electrode has been contact with the liquid surface, the time is long, easy to contaminated electrode surface. So the electromagnetic flowmeter in general, customers are conditions under the condition of open, suggest a year to once a year and a half off cleaning between electrodes to ensure flowmeter measurement precision of the machine. Any instrument is need & other; Maintenance & throughout; Electromagnetic flowmeter is no exception. ( 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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