Method for measuring a temperature of a molten metal bath

A method for feeding a cored wire into molten metal contained in a vessel comprises positioning the cored wire at a first position wherein a leading tip of the cored wire is proximate an entry point of the vessel, the entry point being above a surface of the molten metal, the cored wire comprising an optical fiber and a cover laterally surrounding the optical fiber; feeding the cored wire at a first speed for a first duration from the first position to a second position wherein the leading tip of the cored wire is immersed within the molten metal and lies within a measuring plane, such that a leading tip of the optical fiber projects from the cover and is exposed to the molten metal; and subsequently feeding the cored wire at a second speed for a second duration to take a first measurement of the molten metal.