How to correctly handle the display in the use of magnetic column level gauge
Because of the unique product configuration of the magnetic column level gauge, it is a very intuitive and convenient level gauge. Under normal circumstances, magnetic column level gauge can achieve accurate liquid level, boundary detection, but in the course of use, many magnetic column level gauges are still showing inaccurate, there is the phenomenon of liquid level jump change or draw a straight line One of the main reasons is that the floater is dirty, and the second is that the medium is more viscous and crystallized. It is true that this is the most common and most likely cause of failure in the use of magnetic column level gauges, accounting for the vast majority of magnetic column level gauge failures.
Because the float in the meter's measuring tube itself contains a permanent magnet, and the measured medium contains more or less impurities, its impurities will be absorbed by the magnetic float on the surface in the state of non-flow of the medium for a long time. The more proliferated, the more likely it is that the mass of the float is likely to increase, resulting in a loss of submersion. Even if the adhesion of contaminants does not cause the submerged float, it adheres to the surface of the float causing the float to move up and down in the measuring cylinder. The phenomenon of resistance or jamming, if the inner wall of the measuring cylinder also adheres to impurities, it further hinders the float from floating up and down, causing a phenomenon of jump or stuck in the change of liquid level.
Then, the viscosity of the medium itself is relatively large under normal conditions, which can easily cause the float to move slowly.
In addition, some media crystallize at room temperature, and it is very easy to cause the above phenomena in the float.
The failure of the float to jam, we usually do is disassemble the flange below the float level gauge, take out the float for manual cleaning and decontamination, this maintenance work is dirty, when measuring some corrosive media, such as a variety of alkali Liquids, acids, acid gas separator tanks, gas, or various corrosive industrial media are often injured by corrosive media during maintenance, and the volatilization of toxic gases can also harm humans. The maintenance of demolition float cleaning is a more dangerous job, and protection work should be done in advance.
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With regard to the method of float cleaning, in addition to the manual disassembly and cleaning, we can also implement a method of dismantling the magnetic column level gauge, which is to transform the magnetic block by measuring the plug of the upper part of the cylinder and install a flushing pipeline. Use steam and tap water to switch. When there is a float jam, just connect the side of the magnetic column level meter or the upper and lower connection equipment valves, open the drain valve, then open the upper flush valve, and use steam and tap water to rinse. The dirt impurities adsorbed on the magnetic float can be removed, the impurities on the inner wall of the measuring cylinder can also be removed, and the corrosive damage to the human body can be eliminated, and the labor intensity can also be reduced.
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Since the magnetic column level meter uses the principle of a communicator, the medium in the measuring cylinder is outside the device and is exposed to ambient temperature for a long period of time. When the measured medium is a medium that is easy to condense or freezes below freezing, thermal insulation is considered. With heat tracing, it must be careful not to use magnetic wire with easy-to-magnetic conductive material for insulation to prevent it from being magnetized and cause the panel display and remote magnetic sensor to be affected. For the opening of steam tracing, it is also necessary to control the flow rate so as to prevent magnetic weakening caused by excessive temperature.
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For the phenomenon that the float is jammed or stuck due to the viscosity and crystallization of the medium, we recommend adding a heat tracing tube or adding a tropical heat, and then selecting a magnetic column level gauge with a jacket. In this way, the viscosity of the steam heating medium is reduced, and at the same time, the problem of crystallization of the easily crystallizable medium can be appropriately solved. If the effect is not ideal, then other instruments such as flanged differential pressure transmitters should be selected to solve this problem.
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The fault of the drain valve of the magnetic column level gauge should also be given special attention. If it is necessary to replace it, it must be promptly replaced. Currently, because the needle valve is relatively inexpensive, the instrument manufacturer is generally equipped with a needle valve, so In the daily maintenance and repair, the phenomenon of clogging of the needle valve is easy to occur, and in the discharge of corrosive toxic media, it is required that it should not be directly discharged, but it cannot be taken over and guided. For example, the gate valve can be replaced and installed, its service life is prolonged, and its operation is convenient. When discharging the medium that easily pollutes the environment, it can be screwed onto the discharge line to make the operation more convenient.
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