There are several reasons for the demagnetization of the magnetic float in the high-temperature magnetic flip level gauge. 1. The use temperature is higher than the Curie temperature of the hard magnetic material;
2. The remanence of the hard magnetic material changes with time and is affected by its own factors. With the passage of time, the remanence is less than the critical value of the coupling;
3, high-performance hard magnetic materials have hydrogen embrittlement phenomenon.
The solution can be divided into the following aspects:
A. From the design point of view, choose the right hard magnetic material. For example, use a magnetic material whose Curie temperature is higher than the use temperature by more than 20% to ensure that the residual magnetization exceeds the critical value after five years;
B. From the production point of view, the following points should be noted when machining magnetic floats: 1. When welding (arc welding), measures should be taken to reduce the temperature, so as to avoid that the temperature of the magnetic material at the magnetic float exceeds the Curie temperature of the magnetic material. . 2. The magnetic float is filled with inert gas (such as argon);
C. From the use point of view, the user must make the following points:
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 this 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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