The automatic changing and positioning system developed by KRÜSS allows up to three dosing units simultaneously in wetting analyses.
KRÜSS has recently disclosed Dosing Hub, a new system for contact angle measurements specifically designed for automatic dosing sequences with up to three different dosing units. Thanks to high speed and precise positioning, the system enables reliable wetting analyses with up to four liquids and masters challenging measurement tasks with special dosing units.
The success and quality of the coating and the bonding depends on wettability. The relevant parameters are the contact angle and the surface free energy (SFE), that are measured with drops of one or more liquids dispensed onto the material. However, the often-cumbersome change of liquids and slow positioning and dosing could lead to time losses.
The Dosing Hub simplifies and speeds up these procedures by quickly changing the dosing liquid and transporting it to the programmed dosing height. In addition, the system works together with the exclusive Liquid Needle double-dosing unit, that enables measurements of the SFE with two liquids in a matter of seconds. By combining this system with up to two syringe dosing units, even fully automatic SFE determinations with four liquids can be carried out in short time. Furthermore, the direct dosing without hose lines prevents disturbing air bubbles and reduces the material contact of the substances.
The Dosing Hub is designed to position dosing solutions with pinpoint accuracy. A great deal of flexibility is provided when combining it with a syringe dosing unit or the liquid needle, enabling to alternately carry out routine and special measuring tasks without changing the instrument setup.