A centrifugal pump includes a C-shaped sealing assembly including an annular spring disposed between opposing legs of a base member. A combined prefabricated liner and matrix system with defined properties for fast and simple well andor reservoir completion, monitoring and control is provided. Furthermore, installation from the outside means that the window may be fitted independently of the position of the vehicle on the assembly line, since whether the interior fittings have been fitted or not is of no importance. Within the framework of the method, the terminal device checks an authentication parameter associated with the data carrier and different from the data-carrier keys. The sealing element is translucent.