DataPhysics – DCAT – Dynamic Contact Angle Measuring Devices and Tensiometer

Surface tension acts to contract and minimise any liquid surface. If a surface is being enlarged by the formation of a liquid lamella, as a test body, such as a Wilhelmy plate or Du Noüy ring, is in contact with it, the surface tension exerts a tensile force that can be measured. Within a tensiometer this force is measured by a high precision weighing system and, hence, the surface tension of the liquid can be calculated.

Using a tensiometer, also the interfacial tension between two liquids can be measured with the help of a test body. Since tensiometry is based on force measurements it is – in contrast to the optical analysis of pendant drops – not necessary that one of the liquids is transparent or that the refractive index differs between the two liquids. Therefore, tensiometry is in many cases a handy alternative to the optical measurement of surface and interfacial tensions.

Key Features

• Electrodynamic compensation weighing system of highest resolution with automatic and manual calibration function
• Software controlled, motor-driven height positioning of the sample receptacles with variable speed
• Automatic coupling lock for the balance
• Automatic crash protection for measuring probes during measurement
• Closed illuminated sample chamber
• Digital thermometer with connections for two Pt 100 temperature sensors
• Includes a TP 50 control panel with touch screen and precision control wheel
• Compatible with the liquid dosing unit LDU 25
• Compatible with the Langmuir trough module LTMr

Key Industries