Industrial & Engineering Chemistry Research, Vol.39, No.10, 3640-3645, 2000
High-temperature conductivity measurements for industrial applications. 1. A new cell
A novel conductivity cell, suitable for high-temperature industrial applications, was developed. The cell body was made of Pyrex glass, and the electrodes were made of pure platinum. It was mounted in a 2 L titanium pressure vessel. The effects of the platinization of the electrodes and the level of conductance on the cell constant were extensively studied. It was found that the cell with the platinized electrodes has a very stable cell constant at 19.97 +/- 0.06 cm(-1), for conductivity levels ranging from 1000 to 100 000 mu S/cm. The change in the cell constant when the temperature changes from 25 to 250 degrees C is less than 0.1%. The cell is operable at the equilibrium vapor pressure from low to high acidities. To assess the overall performance of the new cell, the conductivities of 0.05 m H2SO4 solutions at temperatures from 15 to 250 degrees C were measured. These measurements were in excellent agreement with literature values with a difference of less than 1%.