Product Overview

The Attension Sigma 702 force tensiometer measures the static surface tension and interfacial tension of liquids. The integrated screen and keyboard means it does not require an external computer. The system includes data collection software and can be connected to a printer or computer for additional data storage. Temperature control is provided by an integrated water-jacketed vessel holder mounted on the motorised sample stage.

Measurements are obtained by suspending a platinum Du Noüy ring, platinum Wilhelmy Plate or platinum rod from a microbalance. A vessel containing the liquid sample is raised until the ring or plate touches the surface of the liquid. The liquid is drawn up in a meniscus on the solid surface and creates a force due to surface tension. The force is measured by the microbalance and from this the surface and interfacial tensions are calculated.

The information provided includes properties such as dynamic contact angle, surface free energy and wettability. A common application is Critical Micelle Concentration (CMC) which is the concentration of surfactants in which micelles are spontaneously formed.

The Sigma 702ET version is specifically designed for oil-water interfacial tension measurements. The software enables oil-water measurements of transformer oils and fuels in accordance with ASTM D971 and IEC 60422.

Sigma 701 has a more sensitive microbalance with a narrower weight range and a maximum load of 5g. The high sensitivity it ideal for dynamic contact angle measurements of fibers.