A circuit arrangement in whose operational range a system parameter or an ambient parameter lies within a first range. The arrangement includes a node configured to receive a misadjustment signal and a sensor configured to detect the system parameter or the ambient parameter. The sensor is coupled to the node and is configured to detect whether the system parameter or the ambient parameter lies in a predetermined second range. The sensor outputs an alarm signal if the system parameter or the ambient parameter does not lie in the second range, within which the first range lies. The sensor is further configured to permanently adjust the second range in reaction to the misadjustment signal such that the second range does not encompass the first range.