Behaviour of the sensor in an industrial environment

In order to use the sensor on an industrial scale, an appropriate housing is needed in which the required electrodes and temperature sensor are positioned in the scientifically and technically most considered and logical way. Additional requirements imply that the system should be robust and offer good protection against blows and/or other possible causes of defects. The system should be easy to handle, electrodes and other components should be straightforward to replace, the calibration of the electrodes should be accomplishable in a quick and particularly simple way, and the system must 

Broadly, the sensor contains, apart from the glassy-carbon working electrode, a reference electrode, a counter electrode, a temperature sensor and a pH glass electrode with associated reference electrode. As to the auxiliary sensor and electrodes, in the experiments on a laboratory scale, described in the previous chapters, types commonly used in research were employed. Here these need to be replaced by types which satisfy the above-mentioned requirements, which are discussed in the next section. 

6 Schematic representation of the sensor housing. (1) Working electrode, (2) reference electrode, (3) counter electrode, (4) glass electrode with incorporated reference electrode and (5) PT100. 

The first tests were performed in machines at two German companies. Chronologically, the first evaluation experiments were carried out in a 

---