Magnetic flap level gauge fault and troubleshooting High temperature magnetic flap level gauge magnetic float in the course of the magnetic float degaussing degaussing, degaussing and thus lead to failure of the magnetic flap level gauge. High temperature magnetic flap level gauge (especially the high temperature and high pressure magnetic flap level gauge) its use temperature is generally more than 180 degrees Celsius, the installation can be demounted with a certain degree of danger. Magnetic flap level meter demagnetization phenomenon The solution can be divided into the following areas: A, from the design point of view, to choose the right hard magnetic materials. Such as the use of Curie temperature above the use of temperature above 20%, to ensure that after five years remanence exceeds the critical value of the magnetic material B, from the production point of view, the processing of magnetic float to pay attention to the following points: 1, welding (TIG) cooling measures need to be taken to avoid the temperature of the magnetic material at the magnetic float exceeds the Curie temperature of the magnetic material. 2, the magnetic float filled with inert gas (such as argon); C, from the point of view of use, the user should do the following: 1, when ordering the appropriate selection of models to reach the use of temperature does not exceed the nominal temperature of the magnetic flap level gauge; 2, in use, should always observe the use of level gauge (normal service), but also record the actual temperature of the medium (I have seen such a situation, the actual use of temperature is often higher than the temperature on the parameter table, People who design the parameter list may have overlooked some of the factors). Magnetic float level gauge is a commonly used instrument for measuring liquid level. It has the advantages of simple structure, easy to use, stable performance, long service life, easy installation and maintenance, and is widely used in petroleum processing, food processing, chemical industry, water Liquid level measurement, control and monitoring in the fields of chemical, pharmaceutical, power, paper, metallurgy, shipbuilding and boilers. However, during the testing process, due to interference factors, magnetic float level gauge will occur the following problems, affecting the accuracy of measurement results, so we come to the magnetic float level gauge fault problem to understand something: 1, the liquid level gauge cast for a period of time, showing floats difficult to float and float moving insensitive situation. This is fundamentally due to the presence of iron filings or other contaminants on the magnetic float. You can empty the media, and then remove the float, remove the magnetic float stained with iron or other dirt can be. 2, on-site adjustment will find the float moving up and down not sensitive enough. This is mostly due to improper liquid level gauge caused by the device, this time to pay attention to the center of the flange can be up and down in a line, with the degree of vertical plane. Generally speaking, the best angle with the degree of not less than 87 degrees, if the bias is greater, may affect the smooth movement of the float. 3, the choice of intrinsically safe level meter, with particular attention to the level gauge and the safety fence impedance match. 4, the magnetic float level gauge calibration is normal, cast and found the float in a certain position for a period of time "suction" phenomenon. This is mainly the level gauge through the steel platform device, the gap between the plate and produced. Therefore, special attention should be paid to the clearance between the liquid level gauge pipe wall and the cutting edge of the platform through the steel platform device. 5, the use of liquid level gauge, if the output signal generated frequent disturbance or interference pulse, it is necessary to check the signal cable shield can be firmly grounded, the work of the resistance is to meet the request. 6, when the level gauge cast on the spot, pay special attention to open the upper gate valve, then open the lower gate valve. This is due to the level gauge connected to the bottom of the tube is equipped with a maintenance of the float spring, otherwise, the role of large differential pressure float may cause the float gauge can not be used. 7, if the transport or other reasons caused by the scene instructions for the closed glass tube rupture, you can use domestic glass tube change. But it is best to take a vacuum. Also pay attention to the vertical glass tube, so as not to affect the indicator of the instructions. 8, the magnetic float level gauge should pay special attention to the use, do not use a strong magnet in the connecting tube up and down the float to stop checking, or it will lead to changes in the polarity of the magnetic float magnetization, as well as make the float magnetic weakened, resulting in difficult to normal jobs.
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