A problem in the past was that recording H2O2 posed considerable meteorological difficulties and as a result process control was often correspondingly intricate. This problem is now solved by a measuring system, in which the H2O2 sensor still makes use of a long-known measuring principle yet achieves long-term stability of the measurement by means of a new activation process.
The sensor consists of a small- area, diaphragm-coated platinum electrodes that serves as the „working electrode“ as well as a large-area stainless steel „counterelectrode“ which, at the same time assumes the function of the current-carrying counterelectrode and the function of the reference electrode with constant potential within the potentiostatic circuit.
In contrast to other amperometric diaphragm-coated sensors, no special inner electrolyte is required with this sensor. The main task of the diaphragm is to achieve a certain selectivity and independence of flow characteristics. The main feature of the H2O2 process sensor is its continuous electrode activation. This takes place with the aid of potential jump technology in order to avoid ageing of the working electrode. The pulsed amperometric protection process maintains the surface of the measuring electrode in a defined status important for the long-term stability.
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