Abstract: A method of operating an electrolyzer system, including an alkali lye circulating in the system, whereby a lye-related property is determined and further process control is subject to possible change in dependency of an evaluation of the determined property. The property includes the lye concentration which is in particular automatically detected and a lye refilling operation is in particular effected automatically in dependency of the detected concentration, and/or the property includes at least one visually inspectable parameter of the lye and/or lye flow, which is, in particular automatically and in particular during operation of the electrolyzer, detected by visual inspection of the lye/lye flow. An operation condition of the electrolyzer system is determined on the basis of the evaluation.

Abstract: A method of operating an electrolyzer of the cell-stack type, wherein the respective cell voltage of at least two different cells of the cell-stack is measured, wherein the at least two cells are fixedly wired such as to allow automated measuring and wherein measuring signals from the wiring allocated for measurement of at least two different cells are, by an in particular automatic switching, channeled time-shifted with respect to each other via a common wiring path segment.

Abstract: A roller system for flattening irregularly shaped pieces of scrap sheet metal comprises a pair of parallel, horizontally arranged large rollers forming a downwardly converging nip between them. Each roller is formed of curved steel sheets bent to form a cylindrical shape for the rollers. A series of curved, steel liner plates overlay and cover the surfaces of the cylinders. The plates are made of a harder material than the steel sheets. The liner plates on each cylinder are arranged end-to-end and are mechanically fastened to their respective rollers so that the opposite ends of the plates provide a leading edge and a trailing edge. The trailing edge of each plate is chamfered and is arranged against a generally radially directed, blunt edge surface of the leading end of the next plate to form a roughly triangularly shaped in cross-section groove extending longitudinally of the exterior surface of the rollers.