The Automatic Interfacial Tension Tester is the gold standard for modern surface/interfacial tension measurement. By integrating automation (precision sensors, robotics, self-cleaning) and intelligent software, it overcomes the limitations of manual methods-delivering unmatched accuracy, repeatability, efficiency, and ease of use. It is indispensable for fundamental research and industrial applications (e.g., chemicals, pharma, energy, materials, food), enabling deeper insights into liquid behavior, product optimization, and rigorous quality control.

 

 

 

1,Intuitive Color Touchscreen Interface
Equipped with a color touchscreen display and non-marked buttons, the instrument provides full Chinese menu prompts for clear, step-by-step guidance. This design ensures effortless operation without the need for memorizing procedures.

2,High Automation & Reliable Performance
With a high degree of automation, the tester delivers consistent, repeatable results with minimal operator intervention. Its robust design ensures reliable performance across a wide range of testing conditions.

3,One-Touch Full Test Process
After power-on, all tests can be completed by simply following the on-screen menu prompts. The fully automated measurement sequence reduces human error and improves testing efficiency.

4,Dynamic Measurement Capability
The Automatic Interfacial Tension Tester supplier supports dynamic surface tension measurement, capturing changes in surface tension over time. This is particularly useful for studying aging behavior, surfactant kinetics, and emulsification processes.

5,Precise Temperature Control Integration
Integrated temperature measurement and control ensure tests are conducted at controlled temperatures, providing accurate and reproducible results under defined conditions.

6,Versatile Calculation Modes
The system supports multiple calculation methods, including the Wilhelmy plate and Du Noüy ring methods, making it suitable for a wide variety of liquid types and testing standards.

 

 

1. What does this instrument measure and why is it important?

Interfacial Tension (IFT) measures the surface tension at the interface between transformer oil and water (mN/m).

Key significance:

Indicates polar contaminants in oil (oxidation products, acids)

Reflects the aging condition of transformer oil

Supports evaluation of remaining dielectric life

📌 According to ASTM D971, a decrease in IFT is a clear indicator of oil degradation and contamination increase.

2. Which international standards does it comply with?

Typical compliance includes:

ASTM D971 (core standard)

IEC 62961 (electrical insulating liquids testing related standard)

ISO 6295

GB/T 6541 (Chinese equivalent standard)

👉 UHV instruments are designed to:

Fully comply with ASTM D971 Du Noüy ring method

Automatically apply correction factors (Harkins / Zuidema / Huh-Mason)

3. What is the testing principle? Why use the platinum ring method?

Main method:
✔ Du Noüy Platinum Ring Method

Test procedure:

The platinum ring contacts the oil-water interface

The ring is gradually pulled upward

Maximum force is recorded

Converted into mN/m value

📌 Features:

High accuracy

Recommended in ASTM standards

Widely used for transformer oil testing

4. Measurement range and accuracy

Typical UHV configuration:

Measuring range: 0–200 mN/m

Resolution: 0.1 mN/m

Accuracy: ±0.1 mN/m or ±0.1%

5. What IFT values are considered normal?

Industry reference:

Oil condition	IFT (mN/m)	Description
New oil	40–50	Good condition
In service (good)	30–40	Acceptable
Aging	22–30	Warning range
Severe degradation	<22	Replace or treat oil

6. Why can IFT indicate transformer oil aging?

Mechanism:

Oxidation produces polar compounds

Polar compounds accumulate at the oil-water interface

This reduces interfacial tension

7. Manual or automatic? Which one should be chosen?

UHV typically offers two types:

✔ Automatic IFT tester (recommended)

Automatic stage lifting

Automatic peak force detection

Automatic temperature compensation

Automatic calculation of results

✔ Semi-automatic / manual type

Lower cost

Operator-dependent

Lower repeatability

👉 Power utilities and third-party labs generally prefer fully automatic models.

 

Wuhan UHV Power Technology Co., Ltd. is a professional manufacturer and supplier of high-voltage power testing equipment in China. With our own factory and over 10 years of manufacturing experience, We specialize in a wide range of high-voltage testing equipment.As a direct manufacturer, we provide high-quality products, competitive factory-direct prices, and professional technical support. OEM and customized solutions are also available to meet different customer requirements. We offer a one-year warranty and reliable after-sales service, and are committed to building long-term partnerships with customers worldwide.