A method for manufacturing a layer system, in particular for a sensor element for determining a physical variable of a gas to be measured, preferably for determining the concentration of a gas component or the temperature in an exhaust gas of an internal combustion engine. According to the preferred embodiment, the press includes a filter. The protection circuit further includes a gating signal generation circuit configured to generate a turn ON signal for a respective outer switching device that is adjacent to the failed inner switching device or the clamping diode. A current regulation circuit is coupled to sense an output current of the power supply regulator. The shielding plate is a structurally separate part provided with fastening means and is attached only to one of the contact elements of a column of contacts by means of the fastening means.