Measurement and control of a carburising and/or nitriding atmosphere

摘要

The method concerns measurement and control of the concentration of solid or fluid substances and/or the transfer characteristics of a carburising and/or nitriding furnace atmosphere which serves for treatment of metal workpieces, and is supplied with hydrocarbons, air, O2, CO2,N2O, N2 or NH3. The amount of one or more gases in the atmosphere is determined by an electric variable between the electrodes (1, 5) located respectively in a reference medium and in the atmosphere. The electrode (5) is in contact with a solid, ion-conducting electrolyte (4) surrounded from all sides by the atmosphere. The ion-conducting connection between the electrodes is interrupted by means of at least one separation wall which conducts only electrons. The appts. used for implementing the process incorporates electrodes (1, 5) connected to a measuring unit, solid electrolytes (7, 4) surrounded from all sides respectively by a reference medium and the furnace atmosphere, and metal ion-blocking separation walls in contact with their respective solid electrolytes.