Home >> Products >> Industrial Specialized Testing >> Tensiometer / Goniometer >> Interface, surface Tensiometer
TEN302 Interface/surface tensiometer adopt the Wilhelmy plate /Du Nouy ring method. The instrument can be used for liquid measurement with medium and high viscosity, and achieves surface tension testing in ink, paint, petroleum and other industries.

Interface, surface Tensiometer

Model: TEN302, ASTM D1590, ISO 304, ISO 6295

TEN302 Interface/surface tensiometer adopt the Wilhelmy plate /Du Nouy ring method. Precision electronic analysis balances with high measurement accuracy are built in. The integrated control is carried out by the industrial control machine, the sampling is more accurate, the frequency is higher, and the repeatability error is less. Lifting platform using ball screw transmission, transmission is stable, step-in motor control speed adjustable, drive distance more accurate. WinCE interface, can work for a long time, fully automated data analysis to further reduce errors, one-click fully automatic whole process measurement, the results of automatic calculation display, results can be saved, historical reports readable. The instrument can be used for liquid measurement with medium and high viscosity, and achieves surface tension testing in ink, paint, petroleum and other industries.

General Introduction

TEN302 Interface/surface tensiometer adopt the Wilhelmy plate /Du Nouy ring method. Precision electronic analysis balances with high measurement accuracy are built in. The integrated control is carried out by the industrial control machine, the sampling is more accurate, the frequency is higher, and the repeatability error is less. Lifting platform using ball screw transmission, transmission is stable, step-in motor control speed adjustable, drive distance more accurate. WinCE interface, can work for a long time, fully automated data analysis to further reduce errors, one-click fully automatic whole process measurement, the results of automatic calculation display, results can be saved, historical reports readable. The instrument can be used for liquid measurement with medium and high viscosity, and achieves surface tension testing in ink, paint, petroleum and other industries.

Interface, surface Tensiometer

Key Features

  • ​Working Principle
  • Structural Features
  • Standard
  • Application and Maintenance

The interfacial tension meter mainly measures the surface tension of a liquid based on mechanical principles. It uses a sensor (such as a platinum plate or platinum ring) to come into contact with the liquid surface and then measures the maximum force required to detach the sensor from the liquid surface. This force represents the surface tension of the liquid.

During the measurement process, the interfacial tension meter first immerses the sensor into the liquid and then slowly pulls it out. At the moment the sensor detaches from the liquid surface, the instrument records the maximum force needed to pull out the sensor. The magnitude of this force directly reflects the liquid's surface tension.

Tension value Calculation: 

The interfacial tension meter uses high-precision internal sensors and a data processing system to accurately measure and record this maximum force. Then, using specific physical formulas, it converts this force into the surface tension value of the liquid. This value is usually expressed in milli-Newtons per meter (mN/m).

Manual surface tensiometerManual surface tensiometer
Platinum ringDu Nouy Ring method test


★ Two methods: Wihelmy/Du Nouy. 

★ Built-in precision electronic analysis balance; with high measurement accuracy, more accurate sampling, higher frequency and less repeatability error.

★PC Control,  based on Windows software to display test procedure and result; 

★ Measuring tray auto up and down, and with up , down automatic indication function;

★ Lifting platform using ball screw transmission, transmission is stable, step-in motor control speed adjustable, drive distance more accurate. 

★ Automatic stop when the liquid film break;

★ Can work for a long time, fully automated data analysis to further reduce the error, one-click fully automatic whole process measurement, the results of automatic calculation display, the result curve can be saved, historical curve readable. 

★ Output: RS232;     

★ With one key zeroing function; 

ISO 304 "Surface active agents -- Determination of surface tension by drawing up liquid films”

ISO 1409  " Plastics/rubber -- Polymer dispersions and rubber latices (natural and synthetic) -- Determination of surface tension by the ring method”

ISO 6295  " Petroleum products -- Mineral oils -- Determination of interfacial tension of oil against water -- Ring method “

ASTM D1417  "Standard Test Methods for Rubber Latices—Synthetic”

ASTM D1590  "Surface tension of industrial water and Industrial waste water”

ASTM D1331  "Standard Test Methods for Surface and Interfacial Tension of Solutions of Paints, Solvents, Solutions of Surface-Active Agents, and Related Materials”

ASTM D971  "Standard Test Method for Interfacial Tension of Oil Against Water by the Ring Method”

EN 14370  "Surface active agents. Determination of surface tension”

EN14210, OECD 115, ZB2025, GB/T 2960, GB/T 6541, GB/T 22237, GB/T 6541, GB/T 5549 etc.,

Application Scenarios
This instrument is suitable for testing the tension at liquid-air interfaces (surface tension) or between different liquids (such as oil-water interfaces). In the power industry, it can be used for insulating oil quality monitoring; in the chemical industry, it can analyze solution properties; and in educational settings, it can intuitively demonstrate the forces between liquid molecules. Its purely mechanical structure makes it highly durable and easy to maintain, suitable for long-term use.

Operation and Maintenance
Before use, the level must be adjusted, and the platinum ring should be raised and lowered using the worm gear handle. After measurement, the platinum ring and sample container should be cleaned promptly, and the torsion wire should be stored in a relaxed state. The instrument does not require complex calibration; regular lubrication of the mechanical parts is sufficient to maintain performance. The specially designed lever frame structure effectively reduces operational errors.


Factors Affecting Measurement Accuracy

Although the interfacial tension meter is a high-precision measuring device, the measurement results may still be influenced by certain factors. For example, the liquid's temperature, purity, and the stability of the measurement environment can all affect the results. Therefore, when performing measurements, it is necessary to strictly control these variables to ensure the accuracy of the results.

Main Technical Specification

ModelTEN302
Measuring methodMotorized automatic
Display typePC software
PrinterA4 printer
Measuring range1~1000mN/m
Min. dial scale0.01mN/m
Test Method

Du Nouy (Standard);  Wihelmy plate (Optional)

Platinum ring radius9.55mm
Platinum torsion wire0.3mm
Platinum ring perimeter length60mm
Dimensions400*260*450mm
Weight35kg
Power220V, 50HZ / 110V,60Hz


Main Accessories

ItemQuantity
Frame1   set
Platinum ring1   pc
Wilhelmy plate1   pc
Torsion wire1   pc
Pothook1   pc
Glass cup1   pc
500mg weight for calibration5   pcs
Computer (LENOVO)1   set
English version software1   set
Power cord1   set
Documents (Manual, packing list, certificate)


Require More Customized Solutions?

We offer customization to meet your specific needs. Our expert team will collaborate with you to develop the perfect product for you
Customize Now

Beijing United Test Co., Ltd.