Why choose a Karl Fischer volumetric titrator? Volumetric is ideal when working with samples containing higher levels of moisture (generally over 1% or 2%) but also when samples may contain ketones and or aldehydes. In a volumetric system the reagents will be either a composite or a titrant. The reagent is introduced into the titration vessel by way of a piston burette where a precise amount of dosed reagent travels through tubing and out of a titration nozzle. The amount of composite or titrant delivered is based upon the amount of detected moisture found in the sample.