The water content of many samples is difficult to determine because they are only slightly soluble in alcohols, contaminate the titration cell or undergo side reactions with the Karl Fischer reagents. However, instead of introducing the sample into the oven by means of a sample boat, the vial technique is used, i.e. the sample is weighed directly into the sample vial, sealed and transferred to the oven
The 860 KF Thermoprep is a very compact instrument. Heating block, gas pump, flow meter and flow controller are all integrated, as are the drying flasks.
Featuring :
Strictly reproducible analysis conditions yield results with markedly improved precision
Manual sample preparation is reduced to a minimum
You achieve considerable time savings
There is no contamination of the oven and the titration cell; consequently there are no carryover and memory effects
The reagent consumption diminishes significantly as the titrant has to be exchanged only infrequently
Water release from the sample improves as the carrier gas does not just pass over the sample but directly through it.
Advantages of this method :
Direct determination without any sample preparation
No side reactions
Low detection limits
Analysis time per sample: 3.. 5 min
Temperature range: 50 ... 250°C
Flow control of air or N2
Linked to volumetric or coulometric titrator for low to high level moisture determinations