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Conductivity Measuring Cells

Measurement and checking of the specific electrical conductivity is of utmost importance in almost all processes of chemical synthesis, of food processing or of medical engineering. This is due to the fact that even the most minute deviations in conductivity can lead to the inversion of a system and, hence, to its failure. The range of executions of conductivity measuring cells is almost as big as the range of the liquids in which they are used. For example, the measuring cells do not only have to work reliably in absolutely different conductivity ranges from just a few millisiemens to up to several hundred siemens and with a more or less high resolution, but they also have to have a sufficient chemical stability in very diverse aggressive media. Depending on the load of particles in the liquid and on their concentration and size different measuring cells have to be used.

However, they all have one thing in common – namely that an adjusted system consisting of an electrolyte solution and electrodes is used to generate the measured values. For the purpose of use under critical conditions, such as e.g. in the case of concentrated acids and bases, synthetic-resin bound graphites which are characterized by highly constant electrical properties (no drift) and a good long-term stability in addition to their chemical resistance and inertness, are well suited in addition to platinum. Moreover, this material is physiologically safe which is why these conductivity measuring cells can also be used in dialysis devices.

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