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Spinning Drop Interfacial Tensiometer
Spinning drop interfacial tensiometer model TX500D is standard interface chemical analysis system based on spinning drop shape analysis,which can be used for low/ultra-low interface tension analysis

Spinning drop interfacial tensiometer model TX500D is research-based type from USA KINO, which adopts such technologies as removable and both-ends-fixed sample tube sampling mode (RBSM), full-self-sealed quartz glass tube (FSGT)gas-thermal temperature control mode (GTCM)and build-in heating system. The instrument can be used to measure interface tension down to 10-6mN/m for analysis of dynamic interface tension, interface rheology and interface viscosity (oscillating drop method), surface elasticity, relaxation study, etc. It can be applied in fields of personal care product, tertiary oil recovery, micro emulsion, surfactant and more.

spinning drop interfacial tensiometer interface tension meter


Spinning Drop Method Used For Ultra-low Interfacial Tension Measurement

Under conditions of constant temperature and constant pressure, interface energy increases as interface area increases. The increment of interface energy per unit area is referred to as interface tension, which is formed for the different attractive forces of molecules on both sides of interface to molecules on the interface. Spinning drop interfacial tensiometer can accurately analyze low / ultra-low interface tension, while normal methods such as Wilhelmy plate method and Du Nouy ring method are incapable of measuring such low values.

In general, interface tension of 10-2-10-1mN/m is referred to as low interface tension, and that of below 10-3mN/m as ultra-low interface tension.

To measure ultra-low interface tension, the original balance between gravity and interface tension should be artificially altered to enable the shape of balanced droplet can be easily measured. Making system rotate to increase action of centrifugal force field is the measurement principle of spinning drop method. As shown below.


Spinning drop interface tensiometer


Tertiary oil recovery

Emulsion and polymer

Pharmaceutical, pesticide, paint and coating

Cosmetics and food industry

Surfactant, soap & detergent

It’s recommended to purchase full auto surface / interfacial tensiometer A601 / A101 for higher accuracy when the interface tension is above 1mN/m.

Interfacial tensiometer TX500 Series, upgraded from original microscope observation based meter such as model Texas 500 to drop shape analysis based spinning drop interfacial tensiometer. TX500D, with more functions and more application fields, can be able to complete more convenient, more accurate and sophisticated measurements. TX500TM, as one of classic brands from USA KINO, provides clients comprehensive solutions for interface chemical analysis with our most professional technologies.

 Full-automatic interface tension measurement, for measurement of dynamic interface tension.

World-leading full-automatic interface tension measurement technology: software will implement capture, image storage, calculation and displaying measured interface tension automatically at the touch of your finger, effectively avoiding errors caused by human. Furthermore, interface tension values varying with time, rotation speed, and temperature can also be measured, real-time displayed and exported.

 Quiet, high accuracy and high-speed brushless DC motor and its servo control system

Series TX500K uses high-speed brushless DC motor, which guarantees long lifetime, large power, little noise, and accurate of centrifugal control. The control accurate of speed by software can be up to 3 RPM when speed reaches 15000RPM. CVT system enables control of 1RPM, with which USA KINO provides clients a well functional contrifugal control system. Reading of rotation speed is by raster encoder up to 500 lines, far higher accuracy than that of control modes with one or several raster points.

 Heating and cooling system made of new longevity material and high-precision digital semiconductor temperature sensor from U.S.A. for more precise temperature control.

(1) Water circulator or Peltier temperature control system is optional to control temperature lower than room temperature.

(2) Digital semiconductor temperature sensor has self-calibration function with resolution of up to 0.01  and measurement error of 0.2 .

(3) Heating system adopts full-surface heating radiator for well-distributed heating to sample tube, avoiding ruptures due to partial heating.

(4) Our system successfully reduce the impact of temperature control to interface tension analysis.

 Innovative removable sampling system

Newly-developed sample system with both sample tube ends fixed and sample tube removable comprehensively solves a series of problems, such as horizontality preservation of sample tube, convenience of dosing, as well as all kinds of unexpected problems during process of sample tube plugging.

 Innovative gas-thermal temperature control mode

TX500K can effectively control temperature of sample tube, enhance heating efficiency and offer a solution for such defects in Texas500 and TX500C as when air temperature surrounding sample tube is actually 38, it will be displayed 45 on TX500C, while if that is 65-70, it will be displayed 85.

Heating tube and temperature sensor are installed on the same heating aluminum alloy in TX500C&Texas500, so it means the sample tube is heated by heating source with constant temperature, which results heating inefficient and inconformity between control temperature and actual temperature.

spinning drop interface tensiometer

In heating system of TX500D, temperature sensor is mounted on the air that surrounds sample tube and the tube is heated via air, which improves heating efficiency and coincidence between control temperature and actual temperature.

 Brand-new method of seal and fixation for sample tube made of quartz glass

The sample tube is self-sealed, both ends opening, and more convenient to dosing and easier to exhaust. Combining professional PTFE needle of 10cm length from USA KINO, it enables more easily to feed liquids sample (e.g. kerosene, gas oil crude oil) without oil drop moving out when needle is pulled out. TX500G is a kind of interfacial tensiometer from USA KINO with dynamic seal technology, which can automatically inject surfactant - polymer (oil drive) and crude oil. And it can be upgraded to dosing different samples at the same time with accuracy of up to 0.02uL, as well as complete automatic sample mixture and critical micelle concentration (CMC) measurement simultaneously.

spinning drop interface tensiometer

 Illumination-adjustable cold LED background light source with high-illumination, enhancing the capture effect of drop shape

USA KINO’s exclusive illumination-adjustable cold LED background light source can solve the problem of edge distortion of images with single brightness so as to get sharper drop shape and more accurate measuring result. It also can be illumination-adjustable for better edge detecting resolution; meanwhile coaxial light source is available for clearer imaging and extensive applications.

 Alternative camera systems

Cameras with higher resolution (e.g. 130M pixels) and higher speed (e.g.100FPS) are optional available.

 Professional focus and lens control system

System made of aviation aluminum alloy and 4-axes positioning stage for lens positioning (XYZ and rotation) enables control of field of view and focus distance more easily.

 High-precision rotation stage mechanical system and levelness adjustments of up to three unit

It can control levelness of sample tube, facilitate process of controlling movement of oil droplet (gas phase) and reduce distance of movement.

 Modularized design makes better after-sales service

TX500 series are modularity designed, which means

(1) Different modules are available for option: gas-thermal module, water circulator module, dynamic sealing module, or module with contact angle analysis, and also different light source systems, such as stroboscopic light source (automatic flashing like general camera when taking pictures) or coaxial light source, etc.

(2) Better after-sales service: independent modularized design can enable you simple maintenance, and local first-grade agents all stock main parts, so only 24-hour is needed for once maintenance.

(3) More convenient to upgrade: you can purchase part or all of analytical functions, all can be upgraded on demand.

 Brand-new communication port of USB 2.0 with better compatibility and higher speed.

In new variants of TX500 series, motor control, temperature control and video system all adopt USB2.0 port, which effectively avoid the port compatibility problems due to computer upgrade. Some existing newly designed computer and laptop do not have RS232 serial port and PCI port at all, TX500K have no problem to compatible with them.

 Humanized software design and database management

(1) Wizard design of standard windows is designed for various measurement operators.

(2) Database management: one-to-one correspondence between measured value and image; query and modifying of historical data at anytime

(3) Measured data is Excel exportable for you to create your measurement report conveniently.

(4) Secondary modification of eigenvalue. The software will record all your operation traces for you to check measured data, effectively avoiding errors caused by human.

(5) Comfortable language interface designed by unicode enables more convenient and compatible for you to operate.

 Interface tension calculation method that based on distance between two drop boundary lines rather than two points improves measuring accuracy.

 A variety of models available:

CAST 4.0 for control of oscillating drop; interfacial tensiometer of TX500H for contact angle measurement of rock core; interfacial tensiometer of TX500G for precise temperature control and automatic dosing.

 Technical Specifications

Measuring process: image capture of spinning drop , recording of motor speed, measuring the geometric dimensions of droplet, calculation of interface tension by proper method



1.General Specifications

Measuring Range


2.Hardware Specifications

Zoom Range of Lens

0.7-4.5X / optional with 9X18X


WVGA752*480 /cameras with 130M300M500M resolutions are available; Speed: 25 FPS; USB 2.0

Video device of PCI video capture card and camera with 1394 port are optional available60FPS, 100FPS and 300FPS are optional available

Lens Control

X Axis: software-controlled drop image finding and FOV tracing

Y Axis: Focus adjustment

Z Axis: Drop imaging position adjustment

R Axis: High-precision integral rotation positioning stage with lock function; Drop movement controlling

Tilt control of camera lens

Communication Port

USB 2.0

Levelness Control

Four-foot levelness control, sample chamber rotation, and horizontal control of lens

Motor Speed

0-14000 RPM

Motor Type

Servo control system, CVT down to 1RPM

Control Accuracy of Motor


Control Mode of Motor

Encoder with 500 control lines

Heating System

Gas-thermal temperature control mode

Control Range of Temp.

Ambient Temp.+5 - 100

Control Accuracy of Temp.


Heating Mode

Full-surface heating by electrical bar or PTC ceramicoptional

Temperature Probe

Digital semiconductor temperature sensor with self-calibration from USA; accuracy0.0625


Temperature Control Range if with Water Circulator


Sample Tube

Sample tube made of quartz glass with inner diameter(ID) of φ6mmφ4mmφ2mm

Self-sealed Sample Tube

ID of 2mm, both ends opening

Standard Wire

Two-directional (horizontal and vertical) calibration (measurement ruler is optional

Fixation Method of Sample Tube

Both ends fixing

3. Software Specifications

Calculation of Interface Tension

1. Automatically measuring upper and bottom boundary lines, calculating distance between them, then calculating IFT, and finally exporting all data into database for management.

2. The measured data can be manually adjusted, and the operation traces will be saved.

Calculation Method

Full-automatic and secondary manual adjustment with its trace recorded

Magnification Calibration

Calibrations of horizontal and vertical directions

Database Management

Historical data can be regularly saved and managed by database: one-to-one correspondence between data and image; query, adjustment, operation traces recording, as well as Excel and BMP exporting.

Software Control Function

Temperature, high speed motor, X axes (tracking images of drop)

Camera Capture Method

Single capture, continuous capture, capture with 25-60 pictures per second or timing capture, such as 20-minute capture interval and 2-hour total measurement time



 TX500-Spinning Drop Interfacial Tensiometer of 500E/F/G







Temp. controlled by water circulator

Dynamic seal and automatic dosing

Functions & Accessories


1X 10 zoom

Mode of temperature control:

Gas-thermal temperature control system

Dosing system:

Automatic syringe pump

3-channel for water single-channel for oil


Angle of sample stage rotation


Range of temperature control:


Temperature under room temp. can be controlled

System of temperature control

Heat system used conduction oil by thermostat oil bath

Dynamic seal technology

Port of USB2.0

Laptop connected

Heating mode surrounded tube

Four-surface heating


Higher temperatures and lower temperatures are both optional




Special Statements

1.The above production pictures and technical specifications are subject to change without noticeand the latest confirmed product information shall prevail.

2. All rights reserved by USA KINO Industry Co.Ltd. 


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