Attension Sigma 702/ ET
The Attension Sigma 702/ET is a standalone force tensiometer used to measure the static surface tension and interfacial tension of liquids.





Attension Sigma 702/ ET
The Attension Sigma 702/ET is a standalone force tensiometer used to measure the static surface tension and interfacial tension of liquids.
Manufacturer | Attension |
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Product Series | Sigma Force Tensiometer |
Measurement principle | Force tensiometry |
Application | Surface Tension - Contact Angle |
Sample type | Chemicals, pharmaceuticals, surfactants, energy, foods, biomaterials, oil & gas |
Measurements | Surface/ interfacial tension, Critical Micelle Concentration, Dynamic contact angle, surface free energy, powder wettability, density, sedimentation |
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.
- Demonstration video
- Benefits
- Applications
- Sigma range comparison
Demonstration video
Benefits
- High precision microbalance and motorised sample stage.
- Open design making it quick and convenient to use.
- Stand-alone operation without the need for an external computer.
- Temperature control with an integrated thermostatic vessel
Applications
- Influence of Contact Angles and Surface Free Energies on Biocompatibility of Biomaterials
- Critical Micelle Concentration Measurement in Aggregation Behaviour Studies
- Wettability of Pharmaceutical Powders
- ASTM D971 Standard Test Method for Interfacial Tension of Oil Against Water by the Ring Method
Sigma range comparison
SIGMA 700 | SIGMA 701 | SIGMA 702 | SIGMA 702ET | SIGMA 703D | |
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Surface tension | √ | √ | √ | √ | √ |
Interfacial tension | √ | √ | √ | √ | √ |
Critical Micelle Concentration | Automatic | Automatic | Manual | Manual | Manual |
Dynamic contact angle | Automatic | Automatic | Manual | Manual | Manual |
Interfacial tension | √ | √ | – | – | – |
Surface free energy | √ | √ | – | – | – |
Powder wettability | √ | √ | – | – | – |
Density | √ | √ | √ | √ | √ |
Sedimentation | √ | √ | – | – | – |
Balance range | 1-2000 mN/m | 1-1000 mN/m | 1-1000 mN/m | 1-1000 mN/m | 1-1000 mN/m |
Balance max load | 210 grams | 5 grams | 5 grams | 5 grams | 5 grams |
Sample stage | Motorized | Motorized | Motorized | Motorized | Manual |
Temperature control mechanism | Range of water bath accessories | Range of water bath accessories | Built-in thermostatic vessel for water bath | Thermostatic vessel for water bath | Range of water bath accessories |
Stirrer | √ | √ | – | – | – |
Provided software | OneAttension | OneAttension | Data receiver | Data receiver | Data receiver |
Product Enquiry
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