Karl Fischer Volumetric Titrator 100 ppm to 100%
The HI903 Karl Fischer Volumetric Titrator combines an ultra-high precision titrant delivery system with optically-regulated magnetic stirring, sophisticated endpoint determination, dynamic dosing and background drift correction algorithms.
The HI 903 dispenses the titrant, detects the endpoint and performs all necessary calculations automatically.
The HI903 comes equipped with a solvent-handling system to reduce cell conditioning time and can be connected directly to a laboratory analytical balance via RS232 serial interface.
The HI903’s powerful software and intuitive menus are easily navigated on the large, color LCD display, making it simple to view results. Choose from included methods or develop a custom method for almost any application or sample type. Methods (standard or user) can be created, stored or edited with the PC software and then transferred to the titrator by USB flash drive. Software updates can also be performed using a USB flash drive as well.
Karl Fischer Coulometric Titrator 1 ppm to 5%
The HI904 Karl Fischer Coulometric Titrator for moisture analysis combines an ultra-high electrolytically generated iodine dynamic dosing system with optically-regulated magnetic stirring, sophisticated endpoint determination, and background drift correction algorithms.
The HI 904 applies a pulsed DC current for titrant generation, detects the endpoint and performs all necessary calculations automatically.
The HI904 comes equipped with a solvent handling system to reduce cell conditioning time and can be connected directly to a laboratory analytical balance via RS232 serial interface.
The HI904’s powerful software and intuitive menus are easily navigated on the large LCD colour display, making it simple to view results. Choose from included methods or develop a custom method for almost any application or sample type. Methods (standard or user) can be created, stored or edited with the PC software and then transferred to the titrator by USB flash drive.
The Karl Fischer Titration is a classic method in analytical chemistry for the determination of low amount of water in various products such as cosmetics, chemicals, oils, pharmaceuticals, food etc …
The titration is based on the chemical reaction of sulfur dioxide oxidation by iodine
SO2 + I2 + H2O —-> H2SO4 + HI
As long as the iodine added to the system reacts with water, there is no free molecular iodine in the solution, and a high voltage is needed to keep the polarization current specific to the electrode. Once all the water in the sample has reacted, there is free molecular iodine in the solution, and the voltage required to maintain the polarization current decreases.
This voltage drop is used to determine the endpoint of the titration.
The titration can be performed by the volumetric method or by the coulometric method.
In the case of the volumetric method, a Karl Fischer solution containing iodine is added.
In the case of the coulometric method, iodine is made ”in situ” by electrolysis.
