How to Correctly Deal with Inaccurate Display in the Use of Magnetic Column Level Meter

Because of its unique product structure, the magnetic level gauge is a very intuitive and easy-to-use level instrument. Under normal circumstances, the magnetic level gauge can achieve accurate liquid level and interface detection, but during use, many magnetic level gauges still have inaccurate display, level jump changes or straight line drawing, etc. One of the main reasons is that the float is dirty, and the other is that the medium is viscous and crystallized. Yes, this is the most common and most likely cause of failure in the use of magnetic level gauges, accounting for the vast majority of magnetic level gauge failures.

Because the float in the measuring tube of the instrument contains permanent magnets, and the measured medium contains more or less impurities, the impurities will be adsorbed on the surface of the magnetic float in the long-term non-flowing state of the medium. As the use time increases, the impurities will accumulate more and more, which can easily cause the mass of the float to increase and sink, and lose the detection function. Even if the attachment of dirty impurities will not cause the float to sink, its attachment to the surface of the float will cause the float to move up and down in the measuring tube, and there will be a phenomenon of blocking or jamming. If impurities are also attached to the inner wall of the measuring tube, it will further hinder the floating of the float, causing the liquid level to jump or jam.

In addition, the viscosity of the medium itself is relatively large under normal circumstances, which can

easily cause the float to move slowly. In addition, some media crystallize at room temperature, which can easily cause the above phenomenon of the float. 

When the float is stuck, we usually remove the flange under the float level gauge, take out the float and clean it manually. This maintenance work is very dirty. When measuring corrosive media, such as various alkali solutions, acids, acid gas separators, gas or various corrosive industrial media, people are often injured by corrosive media during maintenance, and the volatilization of toxic gases is also harmful to the human body. For this maintenance, disassembly and cleaning of the float is a relatively dangerous job, and protective work should be done in advance. 
 
In addition to manual disassembly and cleaning, we can also modify the magnetic column level gauge to achieve a disassembly-free method, that is, to modify the wire plug on the upper part of the magnetic flap measuring tube, install a flushing pipeline, and use steam and tap water to switch. When the float is blocked, just close the side or upper and lower connecting equipment valves of the magnetic column level gauge, open the drain valve, and then open the upper flushing valve. Use steam and tap water to flush in turn to remove the dirt and impurities adsorbed on the magnetic float, and also remove the impurities on the inner wall of the measuring tube. It will not cause corrosive damage to the human body and also reduce labor intensity.
 
Since the magnetic column level gauge uses the principle of communicating vessels, the medium in its measuring tube is outside the equipment and is at the ambient temperature for a long time. When the measured medium is easy to condense or freeze at below zero degrees, insulation and heating should be considered. When heat preservation, be sure not to use easily magnetic iron wire to fix the insulation material to prevent it from being magnetized and affecting the panel display and remote magnetic sensitive elements. For the opening of steam heating, the flow rate should also be controlled to prevent the temperature from being too high and causing the magnetism to weaken. 
 
For the phenomenon of the float being blocked or stuck due to the viscosity and crystallization of the medium, we recommend adding a heating pipe or heating tape, and then choosing a jacketed magnetic column level gauge. In this way, the viscosity of the medium is reduced by steam heating, and the crystallization problem of the medium that is easy to crystallize can be solved moderately. If the effect is not ideal, then other instruments such as flange differential pressure transmitters should be selected to solve this problem. The 
 
failure of the drain valve of the magnetic column level gauge should also be paid special attention. If it is necessary to replace it, it should be replaced in time. At present, because the price of needle valves is relatively low, instrument manufacturers generally choose needle valves, so in daily maintenance and repair, needle valves are very likely to be blocked, and when discharging corrosive and toxic media, it is required that they should not be discharged directly, but it is impossible to take over the guide. For example, the replaceable gate valve has a longer service life and is easy to operate. When discharging media that are easy to pollute the environment, you can screw on a short circuit to guide it to the drain line, making the operation more convenient.