The automatic control system of liquid level of molten steel in the crystallizer of billet continuous casting machine: the isotope cesium 137 is used as the radioactive source, and the highly sensitive sensor with scintillation receives the γ rays from the radioactive source. The γ rays passing through the molten steel are inversely proportional to the liquid level of the molten steel. The sensor will be converted into electrical signals, through the sensor to measure the liquid level in the crystallizer steel level height continuously, after the intelligent processing of the secondary instrument, the simulation of voltage or current varying with the height of the liquid level is output to the level regulation system send to PLC, by adjusting the control rod lift control level height, or signal after processing to the tension leveler frequency conversion system, to automatically control the drawing speed to keep the molten steel level at a predetermined height.
