高压磁翻板液位计原理及故障分析

  高压磁翻板液位计可用于各种塔、罐、罐、球罐、锅炉的介质液位检测。高压磁翻板液位计可实现高密封、防漏,适用于高温、高压、耐腐蚀的场合。玻璃液位计测量范围宽,显示范围宽,测量范围宽。



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  与其他类型的液位仪表相比,高压磁翻板液位计的安全性更具优势,因为它是液位的就地显示,无需依赖其他电子设备即可实现,稳定可靠,波动小。目前已广泛应用于火力发电厂的压力容器中:高低压除氧器、原水加热器、热网加热器、加热器、凝汽器等单元换热器的高、低压均设有液位计。


  换热器工作介质为易汽化液体,压力从真空状态到2.5MPa,温度从40℃到390℃。因此,液位计日常维护和指示的准确性对压力容器的安全运行起着至关重要的作用。


  本文整理了高压磁翻板液位计的相关知识,让我们一起来看看,希望能对您有所帮助!


  1、不锈钢磁性物位计的工作原理


  高压磁翻板液位计(又称磁浮子液位计)根据浮力和磁耦合原理工作。当被测容器中的液位上升或下降时,液位计主管中的浮子也会上升或下降。浮子中的永磁钢通过磁力联轴器传递到磁场指示器上,当液位上升时,驱动红、白柱旋转180°,当液位下降时,转向柱由白色变为红色,指示器的红白边界是容器内介质液位的实际高度,实现液位指示。


  2、选择时要考虑的因素


  1测量对象,如被测介质的理化性质、工作压力和温度、安装条件、液位变化速度等。


  2测量和控制要求,如测量范围、测量(或控制)精度、显示方式、现场指示、远程指示、与计算机的接口、安全和防腐、可靠性和施工方便性。


  三。还应考虑磁性材料的退磁。消磁导致液位计不能正常工作,测量结果可能不准确。


  3、不锈钢磁性物位计的特性


  1测量范围大,不受容器高度的限制。


  2适应症新颖,阅读直观,醒目。指示器的方向可以根据用户的需要改变。


  三。适用于容器内液位和界面的测量。除现场指示外,还可配备远程变送器、报警开关和完整的检测功能。


  4结构简单,安装方便,维护方便,耐腐蚀,无电源,防爆。


  4、不锈钢磁力液位计指示不准


  &1。判断方法


  (1)容器一直在运行,但容器的液位总是在某一点停止。


  (2)当容器的负荷增加或减少时,容器的液位保持不变。


  (3)就地液位计与室内显示屏上的压差液位计不匹配。


  ≫>>>2。原因


  (1)容器内的水上升或下降过快,也就是说浮子上升或下降过快,磁翻板没有时间转动。


  (2)磁翻板的重心不在中心点。当磁悬浮列车上升时,它会随着磁悬浮列车而翻转。当磁悬浮列车再次升起时,翻板会回到原来的位置,并且没有水位。


  (3)集装箱内的水中杂质过多,吸附在磁悬浮表面。其结果是,当磁悬浮上升时,它不能驱动翻板旋转。


  (4)水的液相管堵塞不同,使容器内实际水位上升。磁浮列车不会随之上升。


  ≫>>>3。解决方案


  (1)尽量使容器内的水位上升或下降过快。


  (2)水位计磁翻板,分


  The stainless steel magnetic flap level gauge can be used to detect the medium liquid level of various tower,tank,tank,spherical vessel and boiler.Stainless steel magnetic flap level gauge can achieve high sealing,leakage proof and suitable for high temperature,high pressure,corrosion-resistant occasions.It makes up for the defects of glass plate(tube)liquid level gauge,such as poor clarity,easy to crack,and has no blind area in the whole process measurement,with clear display and wide measurement range.


  Compared with other types of liquid level instruments,the safety of stainless steel magnetic flap level gauge has more advantages,because it is the local display of liquid level,which can be realized without relying on other electronic devices,and is stable and reliable with small fluctuation.Now it has been widely used in pressure vessels of thermal power plants:high and low pressure deaerator,raw water heater,heating network heater,high and low pressure of unit Heat exchangers such as heaters and condensers are equipped with such level meters.


  The working medium of heat exchanger is easily vaporized liquid,the pressure is from vacuum state to 2.5MPa,and the temperature is from 40℃to 390℃.Therefore,the accuracy of daily maintenance and indication of level gauge plays an important role in the safe operation of pressure vessel.


  This paper sorted out the stainless steel magnetic flap level meter related knowledge,let's have a look,hope to help you!


  1、Working principle of stainless steel magnetic level gauge


  The stainless steel magnetic flap level gauge(also known as magnetic float level gauge)works according to the principle of buoyancy and magnetic coupling.When the liquid level in the measured vessel rises or falls,the float in the main tube of the liquid level gauge also rises and falls.The permanent magnetic steel in the float is transmitted to the field indicator through magnetic coupling,which drives the red and white column to turn 180°when the liquid level rises,the turning column changes from white to red when the liquid level drops,and the red and white boundary of the indicator is the actual high of the medium liquid level in the container So as to realize the liquid level indication.


  2、Factors to be considered in selection


  1.The measurement object,such as the physical and chemical properties of the measured medium,as well as the working pressure and temperature,installation conditions,the speed of liquid level change,etc.


  2.Measurement and control requirements,such as measurement range,measurement(or control)accuracy,display mode,on-site indication,remote indication,interface with computer,safety and corrosion protection,reliability and construction convenience.


  3.The demagnetization of magnetic materials should also be considered.Demagnetization causes the level gauge not to work normally and the measurement results may be inaccurate.


  3、Characteristics of stainless steel magnetic level gauge


  1.The measurement range is large,not limited by the height of the container.


  2.The indication is novel,the reading is intuitive and eye-catching.The direction of the indicator can be changed according to the user's needs.


  3.Suitable for the measurement of liquid level and interface in the container.In addition to on-site indication,it can also be equipped with remote transmitter,alarm switch and complete detection function.


  4.Simple structure,convenient installation,convenient maintenance,corrosion resistance,no power supply and explosion-proof.


  4、Inaccurate indication of stainless steel magnetic level gauge


  &1.Judgment method


  (1)The container is always running,but the liquid level of the container always stops at a certain point.


  (2)When the load of the container increases or decreases,the liquid level of the container remains unchanged.


  (3)The local level gauge does not match the pressure difference level gauge on the indoor display screen.


  ≫>>>2.Reasons


  (1)The water in the container rises or falls too fast,that is to say,the float rises or falls too fast,and the magnetic flap has no time to turn.


  (2)The center of gravity of the magnetic flap is not at the central point.When the maglev rises,it will turn over with the maglev.When the maglev rises again,the flap will return to its original position,and there is no water level.


  (3)There are too many impurities in the water in the container,which are adsorbed on the surface of maglev.As a result,the magnetic levitation decreases,and when the maglev rises,it can not drive the turnover plate to rotate.


  (4)The blockage of the liquid phase pipe of water is different,which makes the actual water level in the container rise.Maglev does not rise with it.


  ≫>>>3.Solution


  (1)Try to make the water level in the container rise or fall too fast.


  (2)Magnetic flap of water level gauge,the center of gravity is not in the center point.If the manufacturing quality does not meet the standard,it should be replaced.


  (3)If the water quality is unqualified,it should be washed regularly.


  ≫>>>4.Maintenance


  (1)There should be no solid impurities and magnetic impurities in the cylinder of the liquid level meter,so as to avoid jamming the float and weakening the buoyancy.


  (2)According to the medium condition,the main pipe can be cleaned regularly to remove the sediment impurities in the pipe.


  (3)After cleaning the level gauge or changing the float,open the drain flange.When installing the magnetic float,pay attention to the heavy end with magnetic end upward,and do not install upside down.


  (4)For low-temperature and special LPG products,the main body of the liquid level gauge is insulated by vacuum jacket.Pay attention not to damage the jacket during installation and use,so as to avoid affecting the product quality.


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