During the process of sulfuric acid production, process engineers are often faced with a challenge:
Numerous measuring methods, with which the concentration or density of the sulfuric acid is to be measured, work only insufficiently at a concentration of 85m% - 99m%. These problems occur especially when the underlying physical value of the concentration or density meter does not change when the concentration changes.
For example, the diagram shows that conductivity sensors provide only poor measuring results for a concentration range of sulfuric acid of 80m% - 97m%, because the conductivity of the liquid hardly changes in this concentration range. For this reason, conductivity sensors have extremely low measuring accuracy if sulfuric acid is to be analyzed in this measuring range.
The situation is similar with density meters, where the density of the liquid itself is to be evaluated. Here it can be seen that especially in measuring ranges above 90m% the density of the liquid hardly changes. Therefore, many simple density meters show high problems if they are to be used to measure the concentration of sulfuric acid in this measuring range.