Electromagnetic flow meter scale zero unstable inspection and take corresponding measures

Abstract: the electromagnetic flow meter scale unstable zero check and take corresponding measures to the information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. The electromagnetic flowmeter the cause of the problem. Zero instability in the cause of the problem can be summarized as five aspects, they are: 1 according to the electromagnetic flowmeter sensor for imperfect by stray current interference: check the flow chart of item 3. Pipeline stray current interference effects such as main. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the unstable electromagnetic flowmeter scale zero check and take corresponding measures to the article details. The electromagnetic flowmeter the cause of the problem. Zero instability in the cause of the problem can be summarized as five aspects, they are: 1 according to the electromagnetic flowmeter sensor for imperfect by stray current interference: check the flow chart of item 3. In pipeline stray current interference effects such as the main series of electromagnetic flowmeter good grounding protection, usually requires grounding resistance less than 1000, don't and he Shared grounding electric machines and appliances. Environment condition is good, sometimes can not grounding series electromagnetic flowmeter can work normally, but once the good environment does not exist, the instrument will fail, then checked again will bring much trouble. Flow sensor near the state changes of electric power equipment ( Such as leakage current increase) Formed by the ground potential changes, electricity will cause zinc series of electromagnetic flowmeter zero change. Please read section 9 inspection method. Electromagnetic flowmeter liquid (2 Such as liquid conductivity uniformity, electrode pollution, etc. ) The reason; Inspection and flow chart of item 4. In static liquid conductivity changes or uneven make zero changes, shook the output flow. So flowmeter position should be far away from the injection solution point or pipe section downstream of the chemical reaction, good flow sensor zui in upstream of the sites. If the liquid to solid phase, or to measure impurities deposition tube inner surface, or on the inner wall of the measuring tube fouling, or electrode by grease filth and so on, all have zero changes may occur. Because the lining surface scale and degree of filth and electrode can't completely the same and symmetrical, destroy the balance of plant initial die set. Positive measures sufficient remove filth and scale deposit layer; If zero were little changed also can try to zero. 3 electromagnetic flowmeter signal circuit insulation. Check the flow chart of item 5. Unstable signal circuit insulation fall will form the zero. Soil to reason for the declining signal circuit insulation of foot, package parts drop caused by the insulation, but also can't rule out signal cable and terminal decline or insulation damage. Because sometimes the environment is very harsh, slightly one careless negligence meter cover/wire joint sealing, filled with moisture acid mist or powder dust intrusion meter connector or cable protection layer, insulating bligh. Signal circuit insulation resistance check respectively according to the cable side and the flow sensor side two mail points, with a megger test. Because of signal cable can do easily. Flow sensor is divided into two: strider liquid-filled test electrode surface and a tube after measuring contact resistance, U insulation resistance. 4 / inspection electrode and electrode contact resistance insulation resistance in 2 steps. （ 1) Filled with liquid measuring scoop of electrode surface contact resistance flow sensor signal cable wiring, each electrode is measured with a multimeter, respectively, and the ground, resistance between two electrodes of geoelectric elder sister value should be left in the 10% to 20%. Section 9 'a/electrode contact resistance measurements will have further instructions. （ 2) Atc measuring electrode insulation vent pipe, wipe with dry cloth in the inner surface, after being completely dry, use H500VDC megohmmeter measure the resistance between the electrode and ground, resistance must be in the 100 m & Omega; The above. 。 Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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