In one aspect, the present invention is directed to a compensator for compensating linearity errors, such as harmonic distortion and intermodulation distortion, in devices. Such a device is adapted to assume a reduced configuration and an operating configuration. The negative C plate is arranged between the first polarizer and the negative A plate. A list of actions to be carried out on each client workstation for reaching the corresponding target configuration is determined by comparing the target configuration with a current configuration of the client workstation stored in a corresponding inventory. The oxidizable metal elements and is peripheral pipe are maintained mutually spaced apart to be electrically decoupled. Hydrates, hemihydrates, anhydrates and similar polymorphic forms are included.