I did read in a book that they used Karl fischer method(http://en.wikipedia.org/wiki/Karl_Fischer_titration
) to measure the water content in lube oils. We want to know how much of the water remains in the lube oil after a run in the oil purifier. We expect the content to be from 0,1-0.3%. We use RH% sensors on the outlet on the oil purifier that says there is 0%(no decimals). We dont belive that the water content is actually 0%.
Can we use the Karl Fischer method to measure the water content? The wiki site states that "The major disadvantage is that the water has to be accessible and easily brought into methanol solution. Many common substances, especially foods such as chocolate, release water slowly and with difficulty, and require additional efforts to reliably bring the total water content into contact with the Karl Fischer reagents."