Attension Sigma 700/ 701

The Attension Sigma 700/ 701 is an automated force tensiometer used to measure the static surface tension and interfacial tension of liquids.

Attension Sigma 700/ 701

The Attension Sigma 700/ 701 is an automated force tensiometer used to measure the static surface tension and interfacial tension of liquids.

Manufacturer Attension
Product SeriesSigma Force Tensiometer
Measurement principleForce tensiometry
ApplicationSurface Tension - Contact Angle
Sample typeChemicals, pharmaceuticals, surfactants, energy, foods, biomaterials, oil & gas
MeasurementsSurface/ interfacial tension, Critical Micelle Concentration, Dynamic contact angle, surface free energy, powder wettability, density, sedimentation.

Product Overview

The Attension Sigma 700/701 force tensiometer measures the static surface tension and interfacial tension of liquids. A platinum Du Noüy ring, platinum Wilhelmy Plate or platinum rod is suspended 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 700/701 force tensiometers are computer controlled. The OneAttension software provides a high level of automation with live analysis and multiple measurement options. It includes automated measurement of CMC.

Sigma 700 is the most versatile tensiometer with an auto-calibrating microbalance that measures up to 210g. The wide measurement range makes it suitable for heavy solids and powder samples.

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


  • High precision microbalance and motorised sample stage.
  • Instrument operation and data storage is fully computer controlled.
  • OneAttension software automates measurements and results presentation.
  • Widest range of measurement modes.
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  • 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
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Sigma range comparison

Surface tension
Interfacial tension
Critical Micelle ConcentrationAutomaticAutomaticManualManualManual
Dynamic contact angleAutomaticAutomaticManualManualManual
Interfacial tension
Surface free energy
Powder wettability
Balance range1-2000 mN/m1-1000 mN/m1-1000 mN/m1-1000 mN/m1-1000 mN/m
Balance max load210 grams5 grams5 grams5 grams5 grams
Sample stageMotorizedMotorizedMotorizedMotorizedManual
Temperature control mechanismRange of water bath accessoriesRange of water bath accessoriesBuilt-in thermostatic vessel for water bathThermostatic vessel for water bathRange of water bath accessories
Provided softwareOneAttensionOneAttensionData receiverData receiverData receiver
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