A Delay Locked Loop and method for generating multiple equally spaced phases over a wide frequency range is disclosed. The input signal for the controller is generated as a function of the instantaneous flow and the end pressure of the compressor such that the controller responds more slowly to working point shifts in the direction of the surge limit line and more rapidly to working point shifts in the opposite direction. The first storage device stores an exception code excluding operation codes corresponding to an instruction set. An inline CAPTCHA handling mechanism uses the same sensor modality as the authentication process, which not only improves the usability, but also facilitates the authentication process. By integrating the fastening element in the insulation package, the expenditure for separate fasteners can be saved so that the installation time and the different components can be reduced.