G20 Instruments for titration-conductivity measurement-colorimetry-voltammetry but close to the production line and not in the laboratory (at-line). Special valves are opened in regular periods of time and the sample is transferred from the line to the analysis vessel. There it is automatically analysed with every available technique (titration, voltammetry, colorimetry, pH, conductivity, etc). The result is transferred automatically to a database which gives to the users information about the procedure of production and gives an alarm if any of the parameters is out of limits. With the experience of so many years of Metrohm Applikon.