Abstract: In a method of testing a function of at least one detector at an inspection station (S) for containers, particularly in an inspection unit (R) for multi-trip bottles, a test gas is fed from a source (10) to the inspection station, or as the case may be to the detector(s), at periodic intervals.

Abstract: Process for producing diacetone-L-ketogulonic acid by passing a solution of diacetone-L-sorbose through a specially constructed electrochemical cell while applying electrical current whereby to bring about oxidation of said diacetone-L-sorbose at the anode of said electrical cell, and recovering the diacetone-L-ketogulonic acid from said electrolyzed solution. The electrochemical cell utilizes an electrode which is characterized by its including at least one electrode roll formed by spiralling a deformable sandwich arrangement of electrode layers and spacing layers for preventing direct electrical contact between them, said electrode layers being made of an electrically conductive material, at least one of the spacing layers being ion-permeable and the electrodes and spacing layers having shapes and material structures which co-operate with each other to enable electrolyte flow through said electrode roll or rolls.

Abstract: Electrode arrangement for electrochemical cells. A deformable sandwich structure (working electrode, insulator, secondary electrode, insulator) forms a primary electrode arrangement. A three-dimensional structure can be formed by rolling up the primary sandwich structure around and axis. The shapes and material structures of electrodes and insulators co-operate with each other to enable axial and/or radial flow of an electrolyte which is pumped through the electrode roll. With such electrode rolls a high ratio of electrode surface to cell volume can be attained. Furthermore, by mounting one or more of the electrode rolls on a hollow axle and pumping the electrolyte through orifices of the axle from its interior into the electrode rolls, the scale-up of current and voltage of a cell is considerably facilitated and advantageously achieved.