Thermal box-barrier for a direct measurement in high temperature environment

Thermal box-barriers (TBB) are used for the thermal protection of measuring systems during exposure in a high temperature environment of various furnaces. This paper deals with problems of TBB design. TBB characteristics and limitations are discussed. The four-layer TBB structure is proposed for the high temperature application. The computer simulation results are presented to show the typical time evolution and spatial distribution of temperature in TBB. Problems of optimum proposal of individual layers thickness are mentioned. Temperatures in the manufactured TBB measured by thermocouples during tests and applications in industrial reheating furnaces are introduced in order to verify the computational results and to show its real thermal insulation capabilities.