Reasons and Treatments of Degaussing of Magnetic Flap Level Gauge

As we all know, all instrumentation products are manufactured according to the relevant scientific principles. As the name suggests, the magnetic flip level gauge uses the magnetic principle of metal to measure the liquid level.

Specifically, the structural principle of the magnetic flip liquid level gauge is based on the buoyancy principle and magnetic coupling. When the liquid level in the tested container rises and falls, the magnetic float in the body tube of the liquid level gauge also rises and falls. The permanent magnet inside is transmitted to the magnetic column indicator through magnetic coupling, and the red and white columns are driven to flip 180°. When the liquid level drops, the column turns from red to white, and when the liquid level rises, the column changes from white to white. Red, the intersection of red and white magnetic flaps on the panel is the actual height of the internal liquid level.

We know that the magnetism of the magnetic flip level gauge is due to the fact that some of the internal microcircuits of the object are arranged for a certain reason (such as long-term placement of non-magnetic iron pieces in a constant magnetic field) in one direction. The total magnetic field strength is greater than other directions, so it exhibits magnetic properties. The high temperature causes the internal molecular motion of the magnet to increase, disrupting the arrangement of internal molecules and demagnetizing the magnet. This was discovered by Madame Curie, so the high-temperature demagnetization point of the magnet is called the Curie temperature of the magnet. This demagnetization point is a very important concept in the manufacture and use of magnetic deflectors. Because of the presence of demagnetization points, magnetic properties do not always exist for all magnetic materials. It is closely related to temperature.

In general, magnetic materials have a critical temperature Tc above which the arrangement of atomic magnetic moments is disorderly due to the intense thermal motion of atoms at high temperatures. Below this temperature, the atomic magnetic moments are arranged neatly, spontaneous magnetization occurs, and the object becomes ferromagnetic. If the temperature is too high, the magnetic force in the float or the column can be demagnetized. For the user to purchase the product, it is necessary to provide the instrument manufacturer with a clear medium temperature to determine the high temperature float to be used.

With regard to how to deal with the phenomenon of demagnetization of magnetic level gauges, we should focus on the following aspects:

First, the magnetic float of the high-temperature type magnetic flip liquid level gauge will have a degaussing phenomenon during use, and the degaussing will lead to the failure of the magnetic flip liquid level gauge. The high temperature type magnetic flap level gauge (especially the high temperature and high pressure type magnetic flap level gauge) generally has a working temperature exceeding 180 degrees Celsius. Therefore, from the design point of view, we must choose the right hard magnetic material. For example, use a magnetic material whose Curie temperature is higher than 20% of the use temperature and guarantees that the residual magnet exceeds the critical value after five years (the magnetic flap level gauge designed by me requires the critical value of coupling to be around 1400 Gauss);

Secondly, from the production point of view, the following points should be noted when machining magnetic floats:

1, in the production and processing of the product must pay attention to the welding (argon arc welding) need to take measures to reduce the temperature, in order to avoid the temperature of the magnetic material of the magnetic float exceeds the Curie temperature of the magnetic material.

2. Fill the magnetic float inside the instrument measuring tube with inert gas (such as argon);

Third, from the user's point of view, the following points need to be done:

1, when ordering use the appropriate model, to achieve the use of temperature does not exceed the nominal temperature of the magnetic flap level gauge;

2, in use, we must always observe the use of the level gauge (can 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, The person who designed the parameter list may have overlooked certain factors).

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