Electromagnetic flow meter scale error generated a couple of reasons

Abstract: the electromagnetic flow meter scale error generated by several reasons why the information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Electromagnetic flowmeter error generated several reasons for electromagnetic flowmeter has many advantages, but improper selection, installation and use, will cause the error increases, the value is not stable, and even the table body damage [ 6, 7] 。 （ 1) Liquid filled because of a shortage of back pressure or flow. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the electromagnetic flowmeter scale error generated by several reasons why the article details. Electromagnetic flowmeter error generated several reasons for electromagnetic flowmeter has many advantages, but improper selection, installation and use, will cause the error increases, the value is not stable, and even the table body damage [ 6, 7] 。 （ 1) Liquid not filled because of a shortage of back pressure or flow sensor installation location, leading to the measuring tube filled with liquid to level of failure phenomenon due to not full and flow conditions have different performance. If a small amount of gas in pipe duct in stratified flow and wave flow, fault phenomenon characterized by error increases, the flow measurement values do not tally with the actual value; If flow is the flow of air bubbles or plug flow, fault phenomenon in addition to the measured values do not tally with the actual value, will be output by gas phase instantaneous covered electrode surface rock; If the gas phase stratified flow in horizontal pipeline flow cross-section part increases, the liquid under the degree of pipe increases, also can appear the output, if the liquid under line situation is serious, so that the electrode surface is below the output will appear super full phenomenon. Example 1 a shipyard has a DN80mm electromagnetic flowmeter measurement of water flow, operation personnel flow to zero after close the valve, the output instead of to achieve full value. Spot checks found that only a short tube, sensor downstream water directly into the atmosphere, the cut-off valve is installed in the upstream of sensor and sensor tube after all water emptying valve is closed. Adapted to the valve position 2, the fault is solved. This kind of the cause of the problem in the case of the factory after-sales service is often encounter, when the error in the engineering design. （ 2) In the liquid to liquid containing solid powder, particles or fibers such as solid, possible fault; 1) slurry noise; (2) electrode surface defiled; (3) insulation sediments or sedimentary cover or lining electrode; (4) the lining by wear or by sediments, narrow flow cross-section. Example 2 conductive deposits short-circuit effect. Electromagnetic flow sensor measurement of pipe insulation lining if deposited conductive material, traffic signals will be short circuit and make the instrument failure. Because of conductive material is sedimentary gradually, this kind of failure usually will not appear in the debugging stage, and to run after a period of time. A diesel engine factory electrolytic process test device, cutting tool workshop with DN80mm instrument measurement and control of saturated salt electrolyte flow for zui better cutting efficiency. At first the meter running, continuous use 2 months later, feel the flow display value more and more small, until the traffic signal is close to zero. On-site inspection, found that the insulation layer deposits a layer of yellow rust, the surface is wiped clean after the meter running. Yellow rust layer is caused by a large number of iron oxide deposition in the electrolyte. This example is a run-time failure, although not see more failures, but if black metal pipeline corrosion is serious, the sedimentary rust layer, also can have the effect of short circuit. Who started running normal, over time, the flow shows more and more small, should be analyzed with the possibility of such failure. （ 3) Possible crystallization liquid, electromagnetic flowmeter should be careful with some easy crystallization chemical material in normal under the condition of normal temperature measurements, as a result of the transmission fluid conduit has good thermal insulation, insulation in work when not crystallization, but difficult to implement electromagnetic flow sensor measurement of tube, thermal insulation, therefore, when the fluid flows through the measuring tube is caused by cooling wall in a layer of solids. Due to switch to other principle of crystallization of the flowmeter measurement also exists, so in the case of no other better way, can choose a kind of measuring tube length is very short & other Ring & throughout; （ oring） Electromagnetic flow sensor, and the flow meter of upstream pipe thermal insulation shall be strengthened. On the pipeline connection methods, considering flow sensor tear open outfit is convenient, when once the crystallization can easily remove the maintenance. Example 3 electromagnetic flowmeter can't work normally caused by liquid crystal examples are not uncommon. Hunan, for example, some smelters to install a batch of electromagnetic flowmeter measurement solution flow rate, because of electromagnetic flow sensor measuring tube is difficult to implement the thermal insulation, the lining after a few weeks and electrode on it with a layer of crystal, leading to the signal source resistance become large, said value disorder. Because this batch of larger diameter electromagnetic flowmeter, frequent unbearable unpick and wash, so after zui or switch to open channel flow meter. （ 4) Electrodes and the problems caused by improper grounding ring material selection for material and does not match the measured medium caused failure of electromagnetic flowmeter with parts in contact with the medium and grounding electrode ring, matching misconduct in addition to the corrosion problem, as long as it is electrode surface effect. Surface effect should be: (1) chemical reaction ( Membrane surface blunt words, etc. ) ； (2) and electrochemical polarization ( Produce potential) ； (3) catalysis ( Electrode surface generating aerosol, etc. ) 。 Grounding ring also have these effects, but the influence degree.

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