Analysis of industrial production are often faced with unstable electromagnetic flow meter to zero

In industrial production are often faced with electromagnetic flowmeter zero unstable condition, there are many types of analysis of causes of this problem, according to han, the technical staff years of experience of science and technology, mainly has the following several factors: 1, pipes, inert liquid or liquid containing bubbles objectively think there is no activity within a flow sensor and practice there is a trace. 2, apply day long or liquid dirty make the valve sealing is not complete and can lead to zero unstable phenomenon to appear. 3, liquid conductivity changes or not average, in rest will make zero change, shook the output activities. 4, due to the lining of appearance of scaling and electrode filthy level impossible to complete the same and symmetrical, destroy the balance of the initial zero setting. 5, the change of flow sensor full power equipment state ( Such as leakage current increase) A grounding potential change, also can make up the intelligent electromagnetic flowmeter zero change. A first ruled out inspection: inspection program check zero intelligent electromagnetic flowmeter unstable process. Press process fully consider first makes a preliminary research and judgment, and then detailed item by item check and test troubleshooting. The process to inspect items listed in the order of successively principle is: ( 1) By observing or ask understand without large operations in the former, namely after the first difficult; （ 2) According to the on-site maintenance experience in the past, the higher the frequency is higher and the future possible probability in the former; （ 3) Check itself needed successively. If several failure after preliminary investigation team indeed sufficient reason, also a detailed inspection in advance. Second, electromagnetic flowmeter sensor according to the incomplete by the stray current interference, such as pipeline stray current interference effects such as main intelligent electromagnetic flowmeter good grounding protection, usually requires grounding resistance less than 1000, don't and he Shared grounding electric machines and appliances. Sometimes better environmental conditions, intelligent electromagnetic flowmeter grounding can not 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 the intelligent electromagnetic flowmeter zero change. Three, the electromagnetic flowmeter liquid ( Such as liquid conductivity uniformity, electrode pollution, etc. ) The reason; 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, the upstream flow sensor is installed in these places. 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. Four, electromagnetic flowmeter signal circuit insulation. 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. Five, the 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 & quot; A/electrode contact resistance measurement & quot; There will be 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. In general, through the above five steps of inspection and operation, basic can solve zero unstable situation.

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