PROCESS AND DEVICE FOR CONTINUOUSLY DETECTING AT LEAST ONE SUBSTANCE IN A GASEOUS OR LIQUID MIXTURE BY MEANS OF A SENSOR ELECTRODE

摘要

Processes and devices are disclosed for continuously detecting at least one substance in a gaseous or liquid mixture by means of a sensor electrode (4) to which is applied a variable potential. In an alternative, the substances are concentrated (A) at the surface of the sensor electrode, their concentration (A) is determined by measuring the electrode capacity, the thus obtained measurement value is correlated with the substance and the substance concentrated at the surface of the sensor electrode (4) is then removed. In another alternative, one or several detection cycles are carried out. In each detection cycle, at least one substance is concentrated (A) at the surface of the sensor electrode (4), the potential is brought to at least one potential characteristic of the electrochemical reaction of at least one substance (B, C), the resulting current (C') is measured and the thus obtained measurement values are correlated with the substances.