Metrohm 774 Oven Sample Processor - Manual (Page 48)

4 Oven control and gas flow
774 Oven Sample Processor, Instructions for use 42
Evaluation
The water determination as such can be carried out with a Coulometer or
Karl Fischer titrator.
If a Coulometer is used care must be taken that gas flow and oven tem-
perature are selected so that the sample moisture is not driven off too
quickly. Otherwise a moisture excess may not be absorbed by the solvent
in the Coulometer cell, but condense in the upper part of the cell or even be
blown out of the cell. Moisture depots lead significant increase of the
measured value drift. Reduced reproducibility of results may occur.
Please note: The measured value of the Coulometer must not exceed
100 mV.