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PC controlled Interfacial tensiometer

PC controlled Interfacial tensiometer

Model: TEN201/TEN202, ASTM D1590, ISO 304, ISO 6295

TEN203 PC Controlled Fully Automatic Surface Tensiometer/Interfacial Tensiometer uses micro-control technology, offering simple operation and high intelligence. It features automatic zero adjustment, real-time display of force values and curves, and peak value hold functionality. Test results are automatically corrected and averaged. Results can be conveniently displayed, stored, and printed. In the hydropower sector, it is used to test the interfacial tension of electrical oils to enhance supervision of insulating oil quality. In the petroleum, chemical, and research sectors, it can measure the surface tension of various liquids to facilitate analysis of different liquids.


Using the ring method under non-equilibrium conditions, it measures the surface tension of various liquids as well as the interfacial tension between mineral oil and water, reliably indicating the presence of hydrophilic oxides. With digital processing technology, the Du Nouy Ring Surface Interfacial Tensiometer offers faster response and improved anti-interference capabilities. 

General Introduction

TEN203 PC Controlled Fully Automatic Surface Tensiometer/Interfacial Tensiometer uses micro-control technology, offering simple operation and high intelligence. It features automatic zero adjustment, real-time display of force values and curves, and peak value hold functionality. Test results are automatically corrected and averaged. Results can be conveniently displayed, stored, and printed. In the hydropower sector, it is used to test the interfacial tension of electrical oils to enhance supervision of insulating oil quality. In the petroleum, chemical, and research sectors, it can measure the surface tension of various liquids to facilitate analysis of different liquids.


Using the ring method under non-equilibrium conditions, it measures the surface tension of various liquids as well as the interfacial tension between mineral oil and water, reliably indicating the presence of hydrophilic oxides. With digital processing technology, the Du Nouy Ring Surface Interfacial Tensiometer offers faster response and improved anti-interference capabilities. 

PC controlled Interfacial tensiometer

Key Features

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

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


★ Mainly consist in platinum ring, platinum torsional wire, differential sensor and data processing system etc.,

★ Easy to operate, high accuracy, auto measuring; 

★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;

★ With peak load function.   

★ Automatic stop when the liquid film break;

★ With function of automatic stop after immerse into liquid;  

★ Electronic automatic zeroing, and zeroing indication;  

★ Automatic calculate liquid surface, interface tension value;

★ Automatic calculate average value of actual tension value;

★ 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.

PC controlled Interfacial tensiometer
Main Test Display Window
PC controlled Interfacial tensiometer
Test Parameter setting


Main Technical Specification

ModelTEN203
Measuring methodMotorized automatic
Display typeLCD screen + PC software
PrinterA4 printer
Measuring range0~200mN/m
Min. dial scale0.01mN/m
Platinum ring radius9.55mm
Platinum torsion wire0.3mm
Platinum ring perimeter length60mm
Sample tray stroke25mm
Glass cup volume60ml
Sample   tray speed15 mm/min±2 mm/min
Dimensions400*250*350mm
Weight22kg
Power220V, 50HZ / 110V,60Hz


Main Accessories

ItemQuantity
Frame1   set
Platinum ring1 pc
Torsion wire1   pc
Pothook1   pc
Glass cup1   pc
500mg weight for calibration5   pcs
Computer1   set
English version software1   set
Power cord1   set
Documents   (Manual, packing list, certificate)


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Beijing United Test Co., Ltd.