Sulfur is one of the most aggressive agents in high temperature process atmospheres. To study the reaction of up-to-date high temperature materials, such as intermetallics, in sulfur, a new apparatus has been built at the LRRS in Dijon. The partial pressure of sulfur is controlled by the temperature of a sulfur bath and, thus, the reaction is not influenced by the presence of hydrogen, as occurs in standard equipment employing H-2/H2S mixtures. Helium is used as carrier gas and also protects the measuring unit of the thermobalance. Hence, high resolution thermogravimetric experiments can be carried out. The experimental set-up and some calibration measurements in the temperature range from 800 degreesC to 1000 degreesC are presented. Pure manganese has been chosen as reference material because its behaviour in pure sulfur atmospheres is well known.