Physical science defines surface tension as shrinking and minimizing the surface area of a liquid. If the surface is enlarged by the formation of a liquid sheet, it means that the surface/interfacial tension is exerted by a measurable tensile force when the test body (such as a Wilhelmy plate or a Du Nouy ring) is in contact with the liquid. Inside the machine, this force is measured by a high-precision load cell system, so the surface/interfacial tension of the liquid can be calculated.
Surface-active compounds such as surfactants consist of a hydrophilic part and a hydrophobic part, so they preferably adsorb at the interface. They reduce the surface or interfacial tension, respectively, which is crucial for good washing performance or foam stability.There is a limit to the number of surfactant molecules that can be accommodated on a given surface area. The only possibility for "excess" surfactant molecules to protect their hydrophobic moieties from water is to form micelles. The specific surfactant concentration reached to initiate micelle formation is called the "critical micelle concentration" (CMC). This can be easily determined by varying the measurement of surfactant concentration: below the CMC, the surface tension decreases with increasing concentration as more and more surfactant molecules are adsorbed on the surface. Above the CMC basis, further added surfactants are only used to form micelles and the surface tension remains constant.
| Model |
IT-800P-2000 |
IT-800P-1000 |
IT-800P-500 |
| Test method* |
Plate method & Ring method |
| Surface Tension Test Range |
0-2000mN/m |
0-1000mN/m |
0-500mN/m |
| Surface Tension Accuracy |
0.1mN/m |
0.01mN/m |
0.001mN/m |
| Density range** |
0-3.000g/cm3 |
N/A |
| Density Accuracy** |
0.001g/cm3 |
N/A |
| Operation method |
Automatic lifting and lowering of sample stage Automatic measurement |
| Lifting speed |
0-300mm/min Arbitrarily Adjustable |
| Temperature measurement |
-40ºC-250ºC(Optional PT100 temperature sensor) |
| Display method |
7-inch touch screen, data read directly |
| Data method |
Support data storage/view/print |
| Measure time |
Normally within 60 seconds |
| Data output** |
RS232 (printer) 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 |
Pre-sale service:
Professional pre-sale model/configuration selection advise and technical support -- offered by experienced technician.
Free on-site installation, debugging and technical training -- offered by strictly trained technology application engineers.
After-sale service:
The warranty period is 24 months from commissioning acceptance date on. After the warranty period is over we provide lifelong maintenance and technical service.
We guarantee the maintenance time no more than 3 working days and response time within 1 hour.
We build instrument service profile for our clients to record the product service and maintenance conditions.
After instruments start service, we will pay follow-ups to collect the service conditions.
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