Abstract: A electrochemical sensor for the detection of traces of HF and/or other acid gases in air, comprising a measuring electrode of an electrochemically active metal oxide powder, a reference electrode for fixing the potential of the measuring electrode close to the equilibrium potential of the oxidation/reduction system of MeOn/Mem+, and a counter electrode. The electrodes are in communicative contact with a hygroscopic electrolyte. The measured gas component changes the pH of the electrolyte, and thus the electrochemical equilibrium of the measuring electrode, to produce a measurable electrical current that is proportional to the concentration of the detected acid gas.

Abstract: The chemical reactor is based on a cylindrical vessel with a stirring device. The stirring device consists of a magnetic stirrer 3, 5, 11a, 11b, 12 with magnetic coils which are disposed around the outside of the cylindrical vessel 1 in the form of a star and produce a magnetic field and of a rotor 3 which is mounted in the region of the rotating field in the vessel 1 such that it can rotate about the cylinder axis. The rotor is provided with stirring blades 11a, 11b, 12 and comprises permanent magnets 5 co-operating with the rotating field.

Abstract: A reference electrode for an electrochemical three-electrode sensor, including a shaft, a platinum electrode embedded in the shaft, a platinum oxide coat at least partially covering the platinum electrode, and a polyhydantoin coat completely covering the platinum oxide coat and any exposed surface of the electrode not coated with platinum oxide.

Abstract: An electrochemical sensor having at least two electrodes that communicate with a liquid measurement cell electrolyte and a housing that encloses the electrodes and the electrolyte. The surfaces of the electrodes facing the electrolyte bridge web connecting the electrodes are covered with a semipermeable membrane.

Abstract: The device for the simultaneous detection of dissimilar gas components contains a number of electrochemical, three-electrode measuring cells with a common electrolyte, that are formed from a number of working electrodes with a common counter-electrode and a common reference electrode. Measured values are generated with the aid of a potentiostatic evaluation circuit that also adjusts and sets the potentials at the working electrodes. The current signals correlated with the gas concentrations to be measured are displayed with the aid of current-measuring instruments 11.sub.1 . . . 11.sub.n in the lines to the working electrodes 5.sub.1 . . . 5.sub.n. At the same time it is important that all three-electrode measuring cells have a common counter-electrode 3 and a common reference electrode 4, and that the potentiostatic evaluation circuit 6 contains control loops 7.sub.1 . . . 7.sub.n which maintain the potentials of the working electrodes 5.sub.1 . . . 5.sub.