A fluid-pressure regulator for regulating the pressure of a fluid. The base portion has walls defining an inner space. Multiple buffer descriptors are stored in a system memory of a network device. An algorithm then employs these parameters to automatically create an optimized layout of multiple wireless access points for the WLAN. The evaluation unit monitors the electric potential of the counter electrode and generates a malfunction signal when said potential is outside a specified reference range. A reference variable which characterizes the operating behavior of the electromagnetic actuator is ascertained, the auxiliary variable is modified as a function of the reference variable to obtain a modified auxiliary variable, and the modified auxiliary variable is checked for the presence of the predefinable characteristic.