TN291 – TG and DTA signals stability Private content

The TAG provides the investigator with a symmetrical TGA-DTA system which means with two furnaces. Deviation on the thermogravimetric signal is equivalent to 1.5 mg at 1000°C with a monofurnace system. That is only due to the combined resulting form the buoyancy effect which vary with the density of the gas, combined with the driving force produced by flowing gases and other disturbing effects.
These perturbations are physically compensated with a second furnace. Moreover, thanks to homogeneity in the furnaces, the DTA signal is stable.

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