The invention relates to a device for determining and/or monitoring a process variable, comprising a sensor element (1) and with at least one electronic unit (2) applying an electric excitation signal (AS1, AS2) for a measurement of the process variable to the sensor element (1). The electronic unit receives an electric measuring signal (MS1, MS2) for the measurement of the process variable from the sensor element (1) and evaluates the measuring signal (MS1, MS2) in relation to the process variable. In the electronic unit (2), an analog-digital-converter (3) is provided. A first excitation signal (AS1) and a second excitation signal (AS2) is applied to the sensor element (1) by the electronic unit (2) for each measurement of the process variable in close temporal succession, such that thefirst excitation signal (AS1) and the second excitation signal (AS2) comprise an adjustable phase (j) to each other.