Force Tensiometer

Sigma Peak

The most versatile force tensiometer in the market.

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Measurements

Measure surface tension of liquid, interfacial tension between two immiscible liquids or interactions between liquid and solid through dynamic contact angle or adsorption measurements.

Dynamic contact angle For advancing and receding angles
Surface and interfacial tension measurements Surface tension/interfacial tension with Du Noüy ring, Wilhelmy plate or rod
Powder wettability Powder wettability by the Washburn method Sigma 700 is recommended for this measurement.
Density For liquid and solid density measurements
Sedimentation For sedimentation kinetics
Adhesion Force For adhesion studies
CMC CMC for critical micelle concentration measurement Requires additional dispensers

Two ways to operate

Use with OneAttension software

For research and development

Operate as stand-alone

For quick ST and IFT checks

Key features

Free-hang and Fixed hook

Hang your probe on the hook for perfect alignment or fix in place when measuring viscous liquids.
Fully automated

Insert your sample and probe, set your recipe. Instrument will take care of the rest.
Multiple probe options

Probes for surface and interfacial tension measurements, density, dynamic contact angle, sedimentation, adhesion force and adsorption studies.
High precision sample stage with large movement range

Up to 125 mm movement range to allow measurements with large samples. Superior movement accuracy for most sensitive measurements.
Advanced sample stage

Use integrated stirrer or connect temperature or pH probe to monitor your sample.
Ionizer

Remove static discharge with the optional ionizer.

All-inclusive system

Software made with you in Mind

Experience the seamless combination of intuitive interface and powerful functionality with OneAttension. It provides live analysis, complete automation, and flexible measurement settings. Simplifying analysis with straightforward data management and industrial-grade reporting.

Learn more about possibility to use as a stand alone or as PC controled option for routine measurements!

Applications

Chemicals
Coatings
Food & beverages
Batteries
Biotechnology & medical devices
Pharmaceutical
Paper & board
Environment
Oil & gas
Electronics

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Most versatile force tensiometer in the market

Attension Sigma Peak brings together premium automation, advanced measurement capabilities and stand-alone convenience to deliver reliable surface and interfacial tension data, day after day. Whether you are optimizing formulations, qualifying raw materials or running method development, Sigma Peak is your central force tensiometer tool.

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Why Sigma Peak?

Ready in 60min

Effortless setup

Sigma Peak is designed to be productive from day one. The instrument arrives pre‑assembled with clear guidance so you can go from unboxing to the first measurement in just a few simple steps. Pre‑defined measurement scripts and automatic probe alignment and operation minimize decision making, so you can focus on your samples.

No recurring costs

Designed for long-term value

With durable hardware, minimal consumable requirements, free software updates, and the ability to serve several teams and applications, Sigma Peak delivers high measurement capacity with a low cost of ownership.

R&D and QC combined

Research and routine QC on one platform

Run advanced R&D studies and routine quality checks on the same platform. With the software, you can perform complex force tensiometry methods, while the standalone mode of the instrument offers fast surface and interfacial tension measurements for everyday QC, all with consistent hardware and data handling.

Touch display with stand-alone functionality

When connected to a PC, Sigma Peak is operated through the OneAttension software, with the touch display offering basic controls for sample stage movement and balance taring. When used as a standalone instrument, measurements of surface and interfacial tension as well as density can be performed directly through the touch display.

Dual operation probe holder

Sigma Peak has a probe holder offering two ways to attach the measurement probe or sample. The first is to hang the probe on a hook, which gives the best alignment thanks to gravity. The second is to fix the probe in place, which can be advantageous when measuring more viscous samples.

Built-in bubble level and ambient temperature monitoring

Sigma Peak has a built-in bubble level indicator close to the balance to ensure levelness where it matters the most. Ambient temperature sensor monitors the environment constantly for better result traceability.

Optional functionalities

Advanced sample stage

Include advanced sample stage to add stirrer, or possibility to connect temperature or pH sensors. Add temperature vessel to control sample temperatures between -20 to +200C.

High resolution balance

Choose the high resolution balance when very small forces need to be measured such as in fiber wettability.

Ionizer

Add built-in ionizer to reduce the static charge of the sample. Especially meaningful when measuring very small forces such as in fiber wettability.

Instrument Selector

Our Instrument Selector will guide you along the way to your new instrument. Answer a few questions and the tool will provide you with the top choices based on your specific needs.

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Applications across science & industry

Determine surfactant effectiveness and efficiency

Surfactants lower surface tension by disrupting interfacial chemical bonds. Their effectiveness is measured by how much they reduce surface tension, while efficiency — evaluated through critical micelle concentration — determines the minimum amount needed, which matters for both cost and environmental impact.

Wettability in Li-ion batteries

Wettability plays an important role in both lithium-ion battery manufacturing as well as performance and safety of the batteries. Studying the wettability at different stages of the manufacturing process is thus crucial and will deepen the understanding needed to produce even better batteries in the future.

Wettability of pharmaceutical powders

Wettability plays an important role in many industrial applications where solid, and liquid interact. In the pharmaceutical industry, the solid is often in the form of a powder. In pharmaceutical powders, wettability plays a pivotal role in formulation, storage, and the performance of dosage forms.

Measurement Capabilities

Surface tension	√
Interfacial tension	√
Critical Micelle Concentration	Automatic (optional)
Dynamic contact angle	√
Surface free energy	√
Powder wettability	√
Density	√
Sedimentation	√
Adhesion force	√

Measurement Performance

Surface tension range	1...2000 mN/m
Displayed resolution	0.001 mN/m
ST resolution – ring (Std / Adv)	0.01 / 0.001 mN/m
ST resolution – plate (Std / Adv)	0.02 / 0.002 mN/m
Contact angle range	0...180°
Contact angle resolution	0.01°
Washburn angle range	0–90°
Density range	0...2.2 g/cm³
Density resolution	0.001 g/cm³

Balance & Force Sensing

Max load – Standard balance	250 g
Max load – Advanced balance	210 g
Weighing resolution (Std / Adv)	0.1 mg / 0.001 mg
Force resolution (Std / Adv)	1 µN / 0.01 µN
Measurement rate	50 Hz
Taring	Automatic
Calibration & locking	Automatic

Sample Stage & Motion

Travel distance	125 mm
Sample stage	Motorized
Sample stage speed	0.001–800 mm/min
Stage positioning resolution	16 nm

Instrument – Physical & Electrical

Dimensions (L×W×H)	265 × 300 x 500 mm
Weight	17 kg
Power supply	100–240 VAC
Frequency	50-60 Hz
Power consumption	20 W
Connectivity	USB-C
Standalone mode	Yes
PC-controlled mode	Yes

Accessories

Ionizer	Optional
pH sensor	Optional
Temperature control range	-20...+200 °C
Stirrer	Optional
Bubble level	Built-in
Ambient temperature sensor	Built-in
Thermostatic vessel	Optional
Temperature probe	Optional

Software & System requirements

Provided software	OneAttension, Standalone
Operating system	Windows 10 / 11

Recommended PC	1 GHz · 1 GB RAM · 40 GB HDD · 1 USB-C
Extra USB ports	For water bath, dispensers

Advanced software. Standalone simplicity.

Sigma Peak is powered by OneAttension, a full PC-based software platform for advanced product development and research. For faster routine work, the built-in standalone mode lets you perform everyday surface and interfacial tension measurements without a computer. One instrument, full flexibility.

OneAttension Software

All-inclusive software

Software is always included in the instrument price with all measurement capabilities.
Free updates

Keep your software up-to-date with free of charge updates and upgrades.
Unlimited licenses

Install to as many computers you want, analyze the data on your personal laptop to save instrument time.

Default recipes and possibility to save your own

OneAttension software comes with default recipes for each measurement type, making it easy to get started. You can also tailor the recipe and save it for future use, ensuring consistent, repeatable measurements.

Live results

Results are displayed live as the measurements are performed. You can monitor both raw data as well as calculated results.

Data handling

OneAttension offers multiple ways to handle the data. You can perform analysis immediately after the measurement or export the data to .bs file to be viewed later on another computer. There is also a possibility to export the data to .xls or .csv files or create a .pdf report.

Integrated Software

Touch display control

Using the standalone mode in Sigma Peak allows for quick surface and interfacial tension as well as density measurements when only routine work is needed.
QC formulation testing

Use Sigma Peak to test your quality control routine. Making the measurements in standalone mode with Sigma Peak ensures that the method works in QC settings.
Material inspection

Use the standalone mode to inspect the incoming material quickly to ensure it meets your quality requirements.

Intuitive UI with several measurement options

Standalone mode has intuitive user interface allowing measurements of surface and interfacial tension with Du Noüy ring, surface tension with Wilhelmy plate, density as well as transformer oil quality following ASTM D971 and IEC 62961 standards.

Default setting and guided measurement

Each measurement type has default settings that can be used in most use cases. If needed, modification of the most important parameters can be done. User interface will guide the operator through the measurement steps.

Results displayed on screen and .pdf

Immediately after the measurement is completed, the results are shown on the instrument screen. Each measurement will automatically create .pdf file, up to 100 of them can be stored in the instrument memory. Connect the instrument to computer or phone via USB-C and store the reports to external drive, quality system or share with the colleagues.

Add more possibilities

What extras do you need in your research? Here are a few of our most common accessories and modules. See them all below.

Platinum Du Nouy ring

Pt-Ir-ring made to fulfill the requirements at least in following standards; ISO 301, ISO 4311, ISO 6889, ASTM D1331 and ASTM D 971. Includes also additional weight for push-mode.

Platinum Wilhelmy plate

Platinum Wilhelmy plate with micro roughened surface.

Powder wettability measuring device, steel

Sample vessel to hold the sample powder. Perforated bottom to support filter paper and to allow liquid penetration into bulk powder, porous solids or fiber bundles. Adjustable packing piston for reproducible packing. Used in measurement of sorption behaviour. Includes one package of filter paper (T112B).

Thermostatic vessel (from -20 to +200°C)

For temperature control of the sample liquid. A heat exchange vessel with fluid jacket type of construction. Heating/cooling of the fluid jacket requires external bath/circulator, not included in T705A. Fits glass sample vessel 70 mm in diameter (T104).

Dispenser, Schott Titronic 20ml

A computer controlled and software operated dispenser for automatic measurements of CMC. Two S101 dispenser are highly recommended for a fully automatic dilution measurement but the measurement can also be performed using only one dispenser by concentrating sample liquid. USB interface to PC.

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What others say

Our instruments are present at many prestigious universities and research facilities world wide. Take a minute to find out what others say about Sigma instruments.

citat8

Researcher at Riken

"We wanted the most accurate force tensiometer on the market for our research on surface tension. Our in-depth testing of the Attension force tensiometer convinced us: it is the one."

Riken, Japan

Riken is a Japanese research institute established in 1917. Its research areas include physics, chemistry, biology, medical science, engineering and computational science.

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