Infrared Continuous Temperature Measurement System for Molten Steel in Tundish

In order to detect the liquid with high temperature, a new kind of continuous temperature measuring system for the molten steel in continuous casting tundish was developed, combining infrared measurement with optical fiber conduction technologies. It overcomes the disadvantages of the existing disposable fast thermocouple such as intermittent measurement, frequent replacement, and experiential insertion position and depth, which can provide a favorable guarantee for the closed loop temperature-related control of the continuous casting production. It is demonstrated that the measurement lag is well solved because the unique single-layer compound outer protection tube with inner sighting tube is adopted, and the system has the advantages in long service life and high measurement precision. In addition, the cost is reduced by 20%~50% compared with the other similar products. The main performance indexes of the system are response speed 3~5s, longest continuous measuring time up to 70h, and average error ±3°C.