Attension® Sigma Force Tensiometers
Attension® Sigma 700/701
These highly sensitive instruments offer high precision surface and interfacial tension measurements, fully automated critical micelle concentration (CMC) determination and measurement of dynamic contact angle, surface free energy, powder wettability, sedimentation, and density.
Automated Results
Fully automated measurements are just one click away
Versatility
All measurement modes are supported
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sigma 700
Sigma 700 is a multipurpose tensiometer well suited for dynamic contact angle and wettability measurements of heavy solids and powder samples. It has an auto-calibrating microbalance that measures over a wide range and can take a maximum load of 210 g.
Sigma 701
Sigma 701 is also a multipurpose tensiometer equipped with a different microbalance that measures in a narrower weight range with high sensitivity. It has a maximum load of 5 g. The sensitivity of Sigma 701 makes it optimal for dynamic contact angle measurements of fibers.
Supported measurements
All measurement methods listed are included with OneAttension at no additional cost.
Surface Tension/ Interfacial Tension
Measures forces at a liquid’s surface or at an interface between two dissimilar phases.
Applications:
Detergents, agrochemicals, paints, food science, pharmaceuticals
Critical Micelle Concentration (CMC)
Measures the surfactant concentration where micelles form
Applications:
Pharmacology, contaminants, detergents, sodium dodecyl sulfate (SDS) studies, cosmetics
Surface Free Energy (SFE)
Evaluates how easily liquids spread or stick to a solid surface by measuring surface wettability
Applications:
Surface cleanliness, powder processing, adhesives, paints
Powder Wettability (Washburn)
Capillary-driven liquid rise through packed powder bed
Applications:
Fabrics, soil, carbon fibers, inks, paints, food science
Adhesion Force
Measures the force that is required to detach a liquid droplet from a surface
Applications:
Self-cleaning surfaces, coating durability, ink adhesion, surface treatments, micro-textured surfaces
Sedimentation
Determines sedimentation rate using the mass of collected sediment in a liquid
Applications:
Cosmetics, food science, pharmaceuticals, paints, coatings, environmental science
Density
Determines the density of a liquid using a probe of known weight, or the density of a solid using a liquid of known density
Applications:
Oil, food science, pharmaceuticals, coatings
Attension Sigma 700/701
Product Features
Balance Hook Probes
Balance hook probes for the Sigma 700 and 701 include a range of tools for precise surface and interfacial tension measurements. The Du Noüy ring and Wilhelmy plate, both made from platinum and compliant with international standards, are used in classic tensiometry methods. The platinum rod functions well with small liquid volumes, while the density probe is used to determine liquid density with high accuracy. The steel powder wettability vessel enables Washburn method analysis of powders, porous materials, and fiber bundles. Additional holders are available for securing plates and fibers during dynamic contact angle measurements. These probes expand the range of measurement capabilities for research and quality control tasks.
OneAttension Software
OneAttension is the integrated software platform used across across all Attension tensiometers, including the Sigma 700/701, for managing measurements, data analysis, and instrument control. The interface is designed to be intuitive, with a recipe-based workflow that guides users through each step of the experiment. Live data displays and automatic result calculations streamline complex analyses such as dynamic contact angles, surface free energy, and critical micelle concentration. All features are included without the need for additional modules or licenses. Data can be exported easily for further processing or reporting.
Modularity and Expandability
The Sigma 700 and 701 are built with a modular design that adapts to a wide range of measurement needs. Users can switch between probes, holders, and vessels to handle liquids, powders, fibers, and solid surfaces without reconfiguring the core system. Additional tools such as automated titration pumps, temperature control vessels, and fiber holders can be added at any time. This flexibility makes it easy to expand capabilities as applications evolve.
Motorized Sample Stage
The motorized sample stage moves with high precision, reaching position resolutions down to 0.01 mm and speed control as fine as 0.01 mm/min. This level of control is critical for dynamic measurements, such as advancing and receding contact angles or surface tension over time. Stage movement is fully automated through the OneAttension software, reducing variability and improving repeatability. Manual control is also available via an integrated keypad for quick adjustments.
Versatile Measurement Modes
The Sigma 700 and 701 support a broad range of measurement types beyond traditional surface and interfacial tension. These include dynamic and static contact angle measurements, surface free energy, powder wettability via the Washburn method, adhesion force, sedimentation behavior, and liquid density. This versatility makes the system suitable for a wide range of materials and industries, from coatings and composites to pharmaceuticals and energy.
High-Sensitivity Balance
The Sigma 700 and 701 feature a microbalance with 0.01 mg resolution and a maximum load capacity of 210 g. This level of sensitivity captures even subtle changes in force, which is essential for low-tension systems or small sample volumes. Automatic balance calibration helps maintain consistency across repeated measurements, reducing the need for manual adjustment.
Application Support & Local Service
In the US and Canada, the Attension products are supported and serviced by Nanoscience Instruments. We pride ourselves on providing exceptional application support and field service, ensuring your team of users is well-trained and the instrument is up and running in optimal condition. Whether you are interested in discussing the feasibility of a specific experiment or need help with troubleshooting your Attension system, our Support teams are here for you!
Attension Sigma 700/701
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