Isothermal vapour-liquid equilibrium data have been measured for the binary system R134a + DME at five temperatures between 293.18 and 358.15 K, and pressures between 0.4899 and 2.9442 MPa. The peculiarity of this system is the existence of an azeotrope with a minimum pressure, which disappears at 358.15 K. The experimental method used in this work is of the static-analytic type, taking advantage of two pneumatic capillary samplers (RolSi™, Armines' patent) developed in the CENERG/TEP Laboratory. The data were obtained with uncertainties within ± 0.02 K, ± 0.0001 MPa and ± 1% for molar compositions. The isothermal P, x, y data are well represented with the Redlich and Kwong equation of state using the Mathias-Copeman alpha function and the Huron-Vidal mixing rules involving the NRTL model. © 2005 Elsevier B.V. All rights reserved.