Isothermal vapor-liquid equilibrium data have been measured for the binary system SO2 + R227ea (1,1,1,2,3,3,3-heptafluoropropane) at 10 temperatures between 288.07 and 403.19 K, and at pressures in the range 0.276-5.38 MPa. The peculiarity of this system is the existence of an azeotrope. The experimental method used in this work is of the static-analytic type, taking advantage of two pneumatic capillary samplers (Rolsi(TM), Armines' patent) developed in the Cenerg/TEP laboratory. The data were obtained with uncertainties within +/-0.02 K, +/-0.0015 MPa and +/-1% for molar compositions. The isothermal P, x, y data are well represented with the Peng-Robinson equation of state using the Mathias Copernan alpha function and the Wong-Sandler mixing rules involving the NRTL model. (C) 2004 Elsevier B.V. All rights reserved.