The principle of the system

The eddy current type molten steel level gauge is the key to the system. The system operates reliably and has excellent performance: high temperature resistance, strong anti-interference ability, fast dynamic response (lag time <0.10s), high detection accuracy (<±05mm), and large measurement range (0-150mm). The selected electromagnetic field frequency ensures that the level detection probe only detects the level change of the mold and does not detect the mold flux or steel slag layer. The system has the advantages of simple operation and no radiation protection problems. The system is insensitive to argon blowing, and its sensors can be mounted on the tundish car or on the platform.

The sensor is cooled by compressed air during use.

The principle is shown in the figure

A high-frequency exciting winding is installed above the molten steel surface of the mold. The magnetic fieldproduced by exciting winding make induced eddy current appear. Themagnetic field generated by the induced eddy current is in the opposite direction to the magnetic field generated by the high-frequency exciting winding, which changes the impedance of the high-frequency exciting winding. Under the condition that the winding material and structure, steel grade, temperatureremain unchanged, the coil impedance change only has a single-value function relationship with the height of the molten steellevel. As long as the impedancechange of the high-frequency winding is detected, the change of the molten steel level in the mold can be converted.