A new Thermal Analyser was developed for solving environmental problems with TA-MS. The sample volume of 170 mi and the balance capacity of 500 g allow a real upscaling, i.e. representative amount of waste can be tested. The furnace is designed for a homogeneous heating of this large sample Volume and the gas flow system guarantees a direct interaction between the purge gas (up to 1000 ml min(-1)) and the sample. Simultaneous thermogravimetry and differential thermal analysis are possible up to 1200 degrees C. Because of the ecological importance of the evolved volatiles during waste incineration, this Macro-STA 419, is equipped with an on line mass spectrometer coupling by a double orifice system, heatable up to 350 degrees C as well as a GC-MS system. All construction parts which come in contact with the sample and the decomposition products are resistant to corrosion. The new developed system is introduced, some specific technical requirements are discussed together with their solutions, and applications will be presented.