Reasons for demagnetization of magnetic flap level gauges and treatment methods

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Specifically, the structural principle of the magnetic flip-top level gauge is based on the principles of buoyancy and magnetic coupling. As the liquid level in the container being measured changes, the magnetic float inside the gauge’s tube rises or falls accordingly. The permanent magnet located within the float transmits magnetic force to the magnetic flip columns, causing the red and white flip columns to rotate 180°. When the liquid level drops, the flip columns change from red to white; when the liquid level rises, they change from white to red. The point where the red and white flip columns meet on the panel indicates the actual height of the liquid level inside the container. We know that in a magnetic flap level gauge, the magnetism arises because certain small circuits within the material are arranged in a particular way for some reason; as a result, the total magnetic field strength in one direction is greater than that in other directions, which gives rise to magnetism. High temperatures increase the movement of molecules within the magnet, disrupting their arrangement and causing the magnet to lose its magnetic properties. This demagnetization point is a very important concept in the manufacturing and use of magnetic flip plates. Due to the existence of this demagnetization point, magnetism does not persist indefinitely in all magnetic materials; it is closely related to temperature. Regarding how to deal with the demagnetization phenomenon of magnetic flap level gauges, attention can be paid to the following aspects: First, in high-temperature magnetic flap level gauges, the magnetic float experiences demagnetization over time, and this demagnetization leads to the failure of the gauge. Secondly, from a production perspective, the following points should be considered when processing magnetic floats: 1. During the product manufacturing process, it is necessary to take cooling measures during welding (TIG welding) in order to prevent the temperature of the magnetic material in the float from exceeding its Curie temperature. 2. Fill the magnetic float inside the instrument’s measuring tube with an inert gas (such as argon).