About this item

The instrument has the following notable features:

1) The tailor-made high-precision electromagnetic force sensor is the basis for ensuring the good performance of the instrument.

2) The machine adopts a 7-inch touch screen, and all operations and information are completed or displayed on the screen.

3) It has a password management function to ensure data traceability and prevent data modification and accidental deletion.

4) Users can calibrate the data with standard samples (distilled water and pure ethanol) to ensure the accuracy of the measurement.

5) Display real-time measurement curves, can save multiple sets of data, support external printers(Printer is optional), and support Chinese/English interchange operations.

Surface Tension Definition

It is well known that we can explain the properties of liquids in terms of the mutual attraction between molecules. This intermolecular attraction is called molecular cohesion or van der Waals force. Surface tension, interfacial tension and similar phenomena are the basic physical phenomena used to explain molecular cohesion.
Specifically, the molecules that make up the liquid experience different forces on the surface than in the bulk. The forces on the molecules in the bulk are symmetrical and balanced. The molecules on the surface, on the other hand, are attracted by the molecules in the bulk without the opposite balancing force. That is to say, it is subjected to a force that is pulled into the body. That is to say, try to reduce the surface area, so that this unbalanced state tends to the equilibrium state. The thermodynamic statement is: To minimize the surface energy of the system, this force is called "surface tension", which is also the free energy per unit area (J/m2), that is, the interface that forms or expands per unit area. Minimum energy required. Its value is consistent with the surface tension (N/m). Due to habit, surface tension is commonly used to express surface free energy, which plays a crucial role in the physical and chemical phenomena of liquid surfaces. In daily life, the dew on the lotus leaf in the morning and the curved water surface in the cup are all surface tension phenomena.

Flexible and versatile surface/interfacial tension measurement methods

This serie tensiometer provides many expansion modules to expand the application scope of the instrument, which is used to measure various characteristics of surfaces and interfaces, which greatly improves the flexibility of its use. The main measurement principle is to accurately obtain the force between the measurement accessory or the sample to be measured when it is wetted by liquid. The instrument uses standard methods including the Du Nouy ring method. to measure the surface and interfacial tension of liquids. In addition, the instrument can be used to accurately measure the density of liquids with the necessary optional accessories.

The spacious sample room is equipped with a transparent glass sliding door, which can protect the room from disturbed airflow. A built-in electronic level aids in precise adjustment of the sample stage for precise force measurement.

The built-in measurement program can control the sample stage to ensure that there is no human interference in the measurement process. The running speed can be adjusted according to the experimental requirements and can be accurately repeated. The use of a dynamic, smooth-running drive eliminates negative vibrations. In addition, the long-term drift of the mechanical sensor is minimized.

Through the 7-inch touch screen, simple and intuitive operation is realized. Intuitive operation on the touch screen is a feature of the new generation of tensiometers, allowing easy control of the sample stage and other components before and during a measurement.

Built-in measurement data management menu, easy to view data and support external printer(Optional accessories) operation. All measurement data files can be transferred through a USB flash drive to convert to Excel files for easy management, recording and organization of measurement data.

The machine program has a password management function to ensure that the data can be traced and prevent data modification and accidental deletion.

Application field

Evaluation of surfactant effectiveness and efficiency by measuring critical micelle concentration

Wetting properties of tablets, active pharmaceutical ingredients and excipients

Wetting of paints and coatingsOil aging degree detection

Coating Wetting and Adhesion

Cosmetics Development

Study on Wetting Characteristics of Ink

Transparent measurement and data management software ST Flash

The simple operation of this Serie Tensiometers is tightly coupled with the software's clear user guidance. Our ST Flash software supports simple results management with automatic summary charts, comprehensive measurement reports and transparent data organization, as well as CMC analysis and calculations.

1.Support data collection, and label the data for easy viewing and comparison.

2.The collected data is saved in the form of a TXT file, which is convenient for viewing and conversion, and a graphic document is generated in the form of PDF when printing.(Please note that the printer is optional,not included in the package.)

3.Supports simultaneous comparison of up to 8 sets of data.

4.ST Flash software provides a toolkit for analyzing CMC concentration.

5.The software supports Chinese and English operation and display.

We attach great importance to the repeatability and standardization of measurement results, and this serie tensiometers are designed to comply with all GB/T, EU, ISO, DIN and ASTM standards for surface and interfacial tension.

Satisfies partially valid norms and standards

ASTM D971 Standard Test Method for Oil-Water Interfacial Tension Using the Lifting Ring Method

ASTM D1331 Standard Test Method for Surface and Interfacial Tension of Surfactant Solutions

ASTM D1417 Standard Method for Testing Synthetic Rubber Latex

DIN EN 14210 Surfactants - Determination of the interfacial tension of surfactant solutions by the stirrup or ring method

DIN EN 14370 Surfactants - Determination of surface tension

ISO 6889 Surfactants - Determination of surface tension by the pull-film method

ISO 304 Surfactants - Determination of Surface Tension by the Pull-Film Method

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

Technical Specifications:

Test method：Du Nouy Ring Method

Surface Tension Test Range：0－2000mN/m

Surface Tension Accuracy：0.1mN/m

Operation method：Automatic lifting and lowering of sample stage Automatic measurement 

Lifting speed：0－300mm/min Arbitrarily Adjustable

Temperature Measurement Range ：-40℃－250℃(Optional temperature sensor is required)

Display method：7-inch touch screen, data read directly

Data method：Support data storage/view/print(Printer is optional)

Measure time：Normally within 60 seconds

Data output：RS232(Printer is optional) or U disk

Data software：Includes ST Flash software

Size：    47*24.5*47.5cm L*W*H

Level way：Electronic level adjustment

Net Weight：18kg

Power：110V or220V、50W