Eight reasons for error of electromagnetic flow meter scale

Abstract: the electromagnetic flow meter scale eight reasons for error information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. In electromagnetic flowmeter, everyone should not unfamiliar, but it looks quite simple. A head of a circle, in fact there are many secret, also often there will be a problem! Today we have combined the example to analyze the analysis have a problem. More flow meter manufacturers choose model price quote you are welcome to inquire, here is eight reasons for error of electromagnetic flow meter scale article details. In electromagnetic flowmeter, everyone should not unfamiliar, but it looks quite simple. A head of a circle, in fact there are many secret, also often there will be a problem! Today we have combined the example to analyze the analysis have a problem how to deal with. A, liquid containing bubbles under test. This is a common phenomenon, there are also external suction caused by internal liquid dissolve, but the electromagnetic flowmeter is couldn't distinguish between the liquid and bubbles, so it can produce and calculate the measurement error. Solution: 1. Pictured above, is not easy to install in pipeline zui highs, change the installation location. 2. Such as the installation position is not easy to change, but in the upstream flow meters installed gas collector, exhaust on a regular basis. Second, liquid not full line under test. , so to speak, not the full package is an extreme case, containing bubbles under, the fluid is both tube top and contains a lot of bubbles, if haven't liquid electrode, the measurement results will be discounted. This is the error in the engineering design. Solution: figure 2 main installation drawing for the correct installation of electromagnetic flowmeter, remember it for it. Three, conductive deposits short-circuit effect. As the conductive material is gradually deposit, traffic signals appear short circuit phenomenon. This kind of failure usually will not appear in the debugging stage, and to run after a period of time. Solution: clean flowmeter is removed, the insulating layer, mostly appear yellow rust, which is caused by a large number of iron oxide deposition in the electrolyte. Who started running normal, over time, the flow shows more and more small, should be analyzed with the possibility of such failure. Four, encounter crystallization liquid. In the selection, we often encounter medium is easily crystalline materials. Although most of the material under normal temperature to normal measurement, and catheter has the thermal insulation effect. But the sensor tube of flowmeter do not contain this feature, so frequent fluid flow through the measuring tube caused by cooling wall in a layer of solids. Solution: 1. Try to choose tube small flowmeter measurement. 2. Remove the more complex, choose this kind of flow meter is not recommended. Five, the liquid conductivity exceed the permitted range. Due to the output impedance of the electrode is determined by the measured liquid conductivity and the electrode size, so when the conductivity is lower than the lower limit value, the instrument can't work normally, a value for the shaking phenomenon. Solution: according to the above problems, the factory after the replacement of tantalum electrode electromagnetic flowmeter work 1. Choose other meet the requirements of low conductivity electromagnetic flowmeter, such as capacitive electromagnetic flowmeter 2. Choose other principle of flow meter, such as orifice plate and so on six, space electromagnetic interference. In general, if a longer cable between sensor and converter and surrounded by strong electromagnetic interference, the cable may introduce interference signal, the formation of common-mode interference, cause display, nonlinear distortion or sharp jolt. Solution: 1. As far as possible away from strong magnetic field ( Such as big motor, transformer and power cables near) 。 2. As far as possible to shorten the length of the cable, shielding measures. Seven, stay current asymmetric flow. Under normal circumstances, the requirement for fluid flow in the pipe of axisymmetric distribution, uniform magnetic field. In fact often arise the axisymmetric velocity distribution, when a vortex flow, influence on the output will be produced by error. Solution 1. Straight pipe upstream enough to ensure that velocity according to the distribution of concentric circles. 2. Meter diameter should be and must be within the scope of the upstream and downstream pipe diameter is the same, otherwise it will make the uneven distribution of flow velocity. 3. If the straight pipe upstream is insufficient, can be installed flow regulator, such as only a part of compensation. Eight, mounting point vibration problem. Electromagnetic flowmeter have strict requirements for the vibration of the installation points and must be installed in small vibration, otherwise will produce certain error. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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