Analysis of Failure Causes of Magnetic Flap Liquid Level Meter Measurement

What should I do if the magnetic flap level gauge is inaccurate? The solution to the inaccurate measurement results of the magnetic flap level gauge. During the use of the magnetic flap level gauge, there will be measurement failures of different phenomena, resulting in the failure of normal production. The following mainly introduces the characteristics of the magnetic flap level gauge itself, and analyzes the failure phenomenon encountered in the field application process. The magnetic flap liquid level gauge is a device that combines the principle of communication device, the principle of buoyancy and the principle of magnetic coupling to display or detect the change of liquid level. First, the height of the liquid level inside the tank is consistent with the height of the main body of the magnetic flap through the principle of the communicating device, and then the position of the magnetic steel in the float ball is ensured to be flush with the liquid level through the principle of buoyancy, and then the rotation of the column on the panel is driven by the principle of magnetic coupling to make the Its color changes to indicate the height of the liquid level inside the tank. Some magnetic flap level gauges cannot be used normally due to unreasonable design or improper operation during installation and use, and even bring danger to safety production. 1 Measurement failure caused by the use environment The magnetic flap level gauge mainly uses buoyancy and magnetic coupling to complete the indication process. When the liquid level rises, the floating ball moves from bottom to top under the action of buoyancy, the flip column is turned 180° by the magnetic induction force in the float ball, the color changes from white to red, and the boundary position of the red and white flip column on the panel is The actual liquid level in the tank (as shown in Figure 1), when the liquid level drops, the floating ball moves from top to bottom, driving the column to turn over, and the color changes from red to white. Therefore, if there is strong magnetic interference in the on-site use environment, it may cause the flipping column to fail to flip normally, affecting the display of the real liquid level. In addition, during the installation process, the main pipe of the magnetic flap shall not be fixed with iron wire or with magnetic material itself, so as to avoid the influence of the iron wire or the magnetic material when the floating ball floats up and down. 2. Measurement failure caused by improper installation The installation position of the magnetic flap must be perpendicular to the ground. The position of the floating ball is mainly affected by buoyancy and its own gravity. Therefore, if the overall installation position of the magnetic flap is inclined, the friction between the floating ball and the pipe wall will increase, which will affect the normal floating of the floating ball. In addition, due to the large overall weight of the magnetic flap level gauge during the installation process, the drainage pipe connected to the side of the tank is subjected to large force, so it must be installed in the middle when the range is large (generally more than 3M). Auxiliary support device to reduce the force on the drainage tube. Due to the presence of some metal impurities in some of the liquids to be measured, the impurities will be deposited on the bottom of the main pipe or adsorbed on the surface of the floating ball after long-term use, and the interior needs to be cleaned regularly. When cleaning, first close the valve connected to the drainage pipe, and then open the drain valve for sewage discharge. If necessary, the bottom flange can be removed for cleaning. After cleaning, install it in the original way, with the heavy side of the float facing up, and tighten the flange bolts. 3 Failure caused by temperature and pressure The normal use temperature and pressure of the magnetic flap level gauge should be within the allowable range of the design technical parameters. Magnetic flap level gauges often fail due to pressure or temperature changes resulting in deformation of the float, weakening of magnetism or leakage during working conditions. In most working conditions, the temperature and pressure can be maintained within a certain range during use, and this range is the design parameter range of the magnetic flap level gauge. In some special conditions, the instantaneous temperature or pressure may exceed the maximum design temperature or pressure of the float, resulting in a weakening of the magnetic induction or the deformation of the float under compression. When the floating ball is subjected to overload pressure, the volume of irreversible deformation will change, and the buoyancy in the liquid will also change, but its own quality does not change. G=m·g, F=ρ·v·g where: G is the gravity of the floating ball, m is the mass of the floating ball, F is the buoyant force on the floating ball, ρ is the density of the liquid, v is the volume of the liquid displaced by the floating ball, g is the acceleration of gravity. In normal use, the gravity of the float must be equal to the buoyancy in the water. When the volume v decreases after compression and deformation, the buoyancy decreases, and the float will sink. When the floating ball is completely submerged in the water, the buoyant force it receives is also large. At this time, if G=F, the actual liquid level will be higher than the displayed liquid level; if G>F, the floating ball will continue to sink under the action of gravity , until the bottom of the float. 4. High and low temperature environment causes failure The use environment of the magnetic flap level gauge is mostly outdoors, and the low ambient temperature in some areas is also one of the reasons for the failure of the magnetic flap. For example, in some working conditions, the temperature of the measured liquid in the tank must be kept constant. At this time, an external constant temperature device (such as electric heating type, water or steam circulation type) needs to be added to the magnetic flap level gauge. Equipment problems or excessive pressure of the jacket leads to leakage of circulating water or steam, which can also cause it to fail. In winter in northern regions, if the material is affected by the low temperature environment, the waterproof performance of the entire panel will deteriorate. Once water vapor or rainwater penetrates into the panel, it will cause the column to freeze or the surface of the panel glass to frost.The operator cannot correctly judge the correct position of the liquid in the tank at this time.

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