High temperature measurement methods in steel industry are presented. Items on contact temperature measurement are temperature measurement error of R and K thermocouples, characteristics of a new Nickel-based thermocouple material (Nicrosil-Nisil thermocouple), a shunt error of a sheathed thermocouple and a heat resistant data logger.
For non-contact temperature measurement methods, basic equations which can be applied to nearly all radiation pyrometer are presented. Concepts on how to select an optimum wavelength of a radiation pyrometer and emissivity of steel material are also described. Various applications of the radiation pyrometry in steel industry, such as temperature distribution measurement by a linear array, applications of an optical fiber, temperature measurement by using specular reflection characteristic of a material, temperature measurement of steel in a reheat furnace are presented. Finally, a new traceability system for the radiation pyrometer is described.