Sigma 700 / 701 Force Tensiometer

About Sigma 700 / 701 Force Tensiometer

UK based Dyne Testing offer Sigma 700 and 701 force tensiometers which are powerful and accurate instruments for measuring static surface and interfacial tension of liquids.

These direct measurements allow determination of a number of material and surface properties, such as dynamic contact angle, surface free energy, critical micelle concentration (CMC) and wettability.

This information can be used to determine adhesion, absorption, adsorption, cleanliness, surface heterogeneity, density, spreading, porosity, powder or sedimentation wettability, material solubility, biocompatibility and lubricity of solid surfaces, to name but a few.

Density force tensiometry has become the method of choice for many industrial standards related to characterization of liquids.  It is also the most widely used technique for measuring critical micelle concentration (CMC) of surfactants. In addition, it is the only method to determine the absorption and contact angle of a packed powder or of fibre beds using the Washburn method. The wetting of textiles and individual fibres can also be studied with Sigma force tensiometers.

Measurement principle
When a liquid touches the surface of a solid, the liquid tends to be drawn up in a meniscus. The force exerted by the meniscus is measured and analyzed to determine surface tension. Using high surface free energy probes such as a platinum Du Noüy ring or Wilhelmy plate allow precise measurement of these forces. All Sigma force tensiometers measure surface and interfacial tension using plates or push and pull modes by ring. Correction calculations for rings are made using models from Huh and Mason (Harkins and Jordan, Zuidema & Waters and others also available).

Software and Accessory Modules

OneAttension is an all-inclusive software enabling immediate access to all measurement capabilities with no need to purchase and install separate software modules. It features an intuitive user interface, live analysis, configurable user groups and accounts and a preset liquid database. Any datapoints or groups of datapoints can be selected, transformed, plotted and analyzed. Data can easily be exported. In-depth analysis is now just a matter of seconds. Accessory modules for dispensers and temperature or pH control can be easily mounted into the measuring unit. In addition, special probes are available for density, wettability and tensiometry measurements as well as holders for fiber and plate studies. Two dispensers can be used simultaneously for critical micelle concentration (CMC) measurements, allowing a full CMC curve to be obtained in one measurement.

Features & Benefits

Sigma 700 and the Sigma 701 force tensiometers come with the OneAttension software for unparalleled performance and usability:

• Fully automatic measurements avoids user dependent variation and saves time
• Select readymade experiment recipes or create custom programs for quick and repeatable operations
• Programmable probe and sample immersion and withdrawal cycle(s)
• Step by step powder protocol for simple powder wettability measurement
• Fully automatic CMC measurement

Applications

Sigma force tensiometers are widely used in research, quality control and process control for the determination of:

• Surface tension
• Interfacial tension
• Critical micelle concentration
• Powder wettability
• Dynamic contact angle
• Sedimentation
• Surface free energy
• Adhesion force
• Density

Specifications

Sigma 700

The Sigma 700 has a wide weight range and microbalance maximum load of 210g, which makes it  well suited for dynamic contact angle measurements of large and heavy solid and powder samples.

Sigma 701

Sigma 701 is also a multipurpose tensiometer but equipped with a different microbalance  – 5g optimized for a different range of applications. Sigma 701 can measure in a much more narrow weight range but with improved sensitivity, optimized for fiber measurements.

Software modules for both models are independent and can be acquired separately, giving you the flexibility to customize the instrument to your needs. Modules are available for the following measurements: surface and interfacial tension, dynamic contact angle, CMC, density, powder wettability and sedimentation.

Recommended system requirements

• 1GHz processor, 1GB MB RAM, 40 GB hard disk drive (20GB free), 1 USB port
• Accessories such as water bath and liquid dispenser may require a free RS-232 port

Operating system requirements

• Windows 7 & 8 (32 or 64 bit), Windows Vista (32 bit), Windows XP SP3 (32 bit)

All Downloads

Filename	Size	Download
Sigma Force Tensiometers Brochure	1.06MB
Sigma Force Tensiometers Technical Specifications	0.37MB
Sigma 700-701 Force Tensiometer Accessory List	0.87MB

Ordering Information

Accessories

For further information about Accessories, see the Sigma 700 & 701 Force Tensiometers Accessories Brochure.

01543411460	[email protected]