Circuit arrangement for determining the temperature difference between two temperature sensors (MS1, MS2), having - a switch arrangement, to which input temperature signals (ZA, ZB) of the temperature sensors (MS1, MS2) are transferred, - an A/D converter, to which the signal levels of the temperature sensors (MS1, MS2) are alternately supplied by the switch arrangement, which A/D converter digitizes the signal levels and transfers the digitized signals to a downstream digital computer for processing, - the digital computer, which determines a temperature difference signal from the digitized signals and provides the temperature difference signal to a first output of the digital computer, and - at least one D/A converter, which converts the temperature difference signal into an analogue temperature difference signal, or at least one digital interface, which provides the temperature difference signal as digital information for further processing, characterized in that - the circuit arrangement is arranged on a multilayer printed circuit board having an internal copper layer, and - at least two mutually corresponding, symmetrically constructed and symmetrically operating input stages for disturbance voltage suppression and for overvoltage protection are connected upstream of the switch arrangement for connecting the temperature sensors (MS1, MS2) to the switch arrangement, wherein the input stages are configured to be electrically and mechanically symmetrical and the symmetrical construction is achieved by a symmetrical arrangement of the components and the connection points for feeding in the input stages on the printed circuit board. - a switch arrangement, to which input temperature signals (ZA, ZB) of the temperature sensors (MS1, MS2) are transferred, - an A/D converter, to which the signal levels of the temperature sensors (MS1, MS2) are alternately supplied by the switch arrangement, which A/D converter digitizes the signal levels and transfers the digitized signals to a downstream digital computer for processing, - the digital computer, which determines a temperature difference signal from the digitized signals and provides the temperature difference signal to a first output of the digital computer, and - at least one D/A converter, which converts the temperature difference signal into an analogue temperature difference signal, or at least one digital interface, which provides the temperature difference signal as digital information for further processing, characterized in that - the circuit arrangement is arranged on a multilayer printed circuit board having an internal copper layer, and - at least two mutually corresponding, symmetrically constructed and symmetrically operating input stages for disturbance voltage suppression and for overvoltage protection are connected upstream of the switch arrangement for connecting the temperature sensors (MS1, MS2) to the switch arrangement, wherein the input stages are configured to be electrically and mechanically symmetrical and the symmetrical construction is achieved by a symmetrical arrangement of the components and the connection points for feeding in the input stages on the printed circuit board.