KEM offers a range of Karl Fischer moisture analysis systems, which are available from John Morris Scientific.
All models are capable of interfacing with balances to streamline the process of sample measurement and to minimise translation errors.
KEM offers two types of KF units.
In the volumetric unit, the sample is dissolved or dispersed in a solvent and titrated with KF reagent, which provides the source of the iodine for the KF reaction.
The titration end point is determined amperometrically, with a platinum electrode, which senses a sharp change in cell resistance when the iodine is reduced by sulphur dioxide in the presence of water.
The KEM volumetric KF instruments include the MKS-500 and MKS-520, which are used to study samples containing sediments and solid residues.
The MKS-500 and MKS-520 autotitrators have detection limits of 10ppm - 100 per cent water (0.1mg - 500mg H2O).
In the coulometric unit, iodine is electrolytically generated in situ - unlike the volumetric method where the KF reagent introduces the iodine.
The current consumed during electrolysis is directly proportional to the amount of water present.
Coulometric KF instruments include the MKC-501 and MKC-520, which are suitable for analysing virgin chemical samples, as there is less likelihood for residue to form on the instruments iodine generator.
These coulometric units range in sensitivity from 10ug - 100mg.
