Reference measurement system for low electrolytic conductivity values with a flowing solution

In order to answer the needs of the industrial and the clinical sectors, INRiM has undertaken activities to extend the traceability of electrolytic conductivity measurements to pure water values. In this progress report, the new cell and the measurement system with flowing solution are described. Since international documents prescribe the use of a system with flowing solution to reduce CO2 contamination for solutions with conductivity lower than 50 mu S cm(-1), preliminary measurements were carried out on three solutions with conductivity values of 50, 30 and 10 mu S cm(-1). Moreover, a comparison between a system with static solution and one with flowing solution was executed.