- Products
- Attension
- Force Tensiometers
- Sigma 702ET
Force Tensiometer
Sigma Transformer Oil
Designed for measurements of interfacial tension of transformer oil according to relevant standards.
Measurements
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Surface and interfacial tension measurement Du Noüy ring method
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Density For liquid density measurements.

Quality control of transformer oil
Key features
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Quick measurements
Get results in minutes -
Results as .pdf files
Transfer results from the instrument to your computer or phone through USB-C connection -
High precision
Highly sensitive balance combined with super accurate samples stage movement guarantee reliable measurements -
Multiple correction methods for Du Nouy ring
Huh-Mason, Zuidema-Waters and Harkin-Jordan corrections available -
Several probe options for surface tension
Use Platinum Du Nouy ring or Wilhelmy plate, platinum rod or paper plates -
Additional capabilities
Add advanced sample stage for temperature, pH or stirrer. Include ionizer to remove static discharge
Applications
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Energy
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Chemicals
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Coatings
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Food & beverages
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Pharmaceutical
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Environment
Easy operation without PC
Sigma Transformer Oil features an intuitive touch display with a guided interface, making transformer oil quality control to ASTM D971 and IEC 62961 standards straightforward — minimal training required, from measurement to report.
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Measurement Capabilities
| Surface tension with Du Noüy ring | √ |
| Surface tension with Wilhelmy plate |
√ |
| Surface tension with rod |
√ |
| Interfacial tension with Du Noüy ring | √ |
| Density of liquid | √ |
Measurement performance
| Surface tension | 1....2000 mN/m |
| Displayed resolution |
0.01 mN/m |
| ST resolution - ring |
0.01 mN/m |
| ST resolution - plate | 0.02 mN/m |
| Density range | 0...2.2 g/cm3 |
| Density resolution |
Balance and force sensing
| Max. load |
5 g |
| Weight resolution |
0.01 mg |
| Force resolution |
10 μg |
| Measurement rate | 50 Hz |
| Taring | Automatic |
| Calibration & Locking | Manual |
Sample stage & Motion
| Travel distance |
125 mm |
| Sample stage |
Automatic |
| Sample stage speed |
0.001 - 800 mm / min |
| Stage position resolution | 16 nm |
Instrument - Physical & Electrical
| Dimensions (L x W x H) |
265 x 300 x 500 mm |
| Weight |
15 kg |
| Power supply |
100 ... 240 VAC |
| Frequency | 50 - 60 Hz |
| Power consumption | 20 W |
| Connectivity | USB-C |
| Standalone | Yes |
| PC-controlled mode | No |
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
| Software | Integrated |
| Result output |
Integrated Software
Sigma Transformer Oil comes with a powerful embedded software that guides the user in the measurements according to the relevant standards and shows the results on the integrated screen. Data can be also stored in PC with Data Receiver software for additional data storage and reporting.
Integrated Software
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Operation via touch display
Embedded software allowing full instrument operation via touch display. -
Surface and interfacial tension made easy
Surface and interfacial tension as well as liquid density measurements can be performed with ease. -
No training needed
Intuitive user interface with guidance provides a platform that can be used by anyone with minimum training needed.
Intuitive UI for surface and interfacial tension
Standalone mode has intuitive user interface allowing measurements of surface and interfacial tension with Du Noüy ring, surface tension with Wilhelmy plate, and density.
Default settings and guided measurements
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
Simplify your work and explore more with these selected extras for Sigma Transformer Oil. You can find the full range 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.

Thermostatic vessel
Chamber made from Teflon and Aluminum 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 (T102ME or T102USB). Fits glass sample vessel 70 mm in diameter (T104). Operable temperature range from -20 to +200°C .

RS232-compatible printer
For printing results directly from instrument into paper.
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 our Sigma Instruments.

Researcher at Riken, Japan
“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.
Learn more
We have gathered all our in-depth knowledge associated with Sigma 702 ET. Browse around amongst webinars, overviews and white papers to find a topic of interest.
- Attension
How to Measure Quality of Transformer Oils
- Attension
Surface and Interfacial Tension
- Attension
Surface Tension and Surfactants in Industrial Processes
- Attension
Surface and Interfacial Tension
- Attension
Comparison of ASTM D971 and IEC 62961 Standards
- Attension
Using Contact Angle Measurements in Surface Research and Quality Control
- Attension
