The principles of an automated ebulliometer for fast binary vapour-liquid equilibrium data measurement are presented. The system is made of a thermostated 0.51 tank equipped wtb a hollow shaft and a self-inducing turbine to ensure fast equilibration, sampling and analysis systems, and a microcomputer for commanding the different valves and sensors, recording and analysing experimental data. The automated feed system allows one to introduce successively in the tank, mixtures with known global compositions. A given mixture is subjected to a temperature program consisting of symmetrical upward and downward temperature paths. With a parameter estimation minimising a pressure criterion, the (P, T, x) technique associated with a mass balance leads to liquid-vapour equilibrium modelling. The tests were performed with acetone-methanol and isopropanol-methanol mixtures. Good equilibrium data over the full range of composition in broad P and T domains can be gathered in a short period of time.