A method for determining and/or monitoring at least one process variable of a medium using a vibronic sensor, wherein - a unit that can mechanically oscillate is made to mechanically oscillate in a first oscillation mode by a drive/receiving unit using a first electrical excitation signal, wherein the first electrical excitation signal and, accordingly, the first oscillation mode are selected in such a way that a frequency depends on the physical and/or chemical properties of the medium and is a function of the density (p) and/or viscosity of the medium, - the mechanical oscillations of the unit that can oscillate are received in the first oscillation mode and converted into a first electrical received signal, and - the first electrical excitation signal is generated from the first received signal and the at least one process variable is determined from the first received signal, characterized in that - the unit that can mechanically oscillate is made to mechanically oscillate in a second oscillation mode of the unit that can mechanically oscillate by the drive/receiving unit using a second electrical excitation signal, wherein the second electrical excitation signal and, accordingly, the second oscillation mode are selected in such a way that a frequency of a second received signal is mainly constant depending on the density (p) and/or viscosity of the medium, - the mechanical oscillations of the unit that can oscillate are received in the second oscillating mode and converted into the second electrical received signal, and - the second electrical excitation signal is generated from the second received signal, and an influence of the temperature of the medium on the first received signal is compensated for using the second received signal. - a unit that can mechanically oscillate is made to mechanically oscillate in a first oscillation mode by a drive/receiving unit using a first electrical excitation signal, wherein the first electrical excitation signal and, accordingly, the first oscillation mode are selected in such a way that a frequency depends on the physical and/or chemical properties of the medium and is a function of the density (p) and/or viscosity of the medium, - the mechanical oscillations of the unit that can oscillate are received in the first oscillation mode and converted into a first electrical received signal, and - the first electrical excitation signal is generated from the first received signal and the at least one process variable is determined from the first received signal, characterized in that - the unit that can mechanically oscillate is made to mechanically oscillate in a second oscillation mode of the unit that can mechanically oscillate by the drive/receiving unit using a second electrical excitation signal, wherein the second electrical excitation signal and, accordingly, the second oscillation mode are selected in such a way that a frequency of a second received signal is mainly constant depending on the density (p) and/or viscosity of the medium, - the mechanical oscillations of the unit that can oscillate are received in the second oscillating mode and converted into the second electrical received signal, and - the second electrical excitation signal is generated from the second received signal, and an influence of the temperature of the medium on the first received signal is compensated for using the second received signal.