The BP-D5 is a fully automatic bubble pressure tensiometer for measurement of the dynamic surface tension of aqueous surfactant solutions in a time function or at a fixed surface age. For monitoring the bubble formation, the pressure voltage waveform is displayed in real-time and bubble formation is made visible by a synchronized built-in stroboscope.
Temperature-dependent measurements can also be carried out with the built-in jacket type stage and thermometer.
Pressure Voltage Waveform
To obtain valid measurement data, the air bubbles generated by the submerged glass probe must be clearly separated from one another. The real-time waveform display helps monitor the lifetime condition and allows appropriate adjustment of the airflow rate. The graph below shows the difference between a measurement with excessive airflow and disturbed bubble generation on the left and an appropriate setup on the right with an ideal waveform for accurate and reliable results.
Extrapolation according to Hua & Rosen
Based on the recorded surface age raw data, the average values will be calculated and displayed in a graph. Data of up to 11 measurements can be directly compared if they share the same surface age range
Using the fitting method of Hua & Rosen, the surface tension is extrapolated immediately after bubble generation and at equilibrium.
■ Main Features
- "One-click" fully automated operation
- Surface tension against surface age (from 20 to 5.000 ms) chart is computed and plotted automatically
- Measurement of the dynamic surface tension at a specific surface age from 20 to 1.000 ms.
- Real-time display of the bubble pressure waveform to monitor the conditions of the bubble generation
- Extrapolation of the averaged raw data according to a method suggested by Hua & Rosen
- The bubble generation from the capillary is made visible by a synchronized built-in stroboscopic lamp
- Built-in jacket-type stage and platinum resistance thermometer for measurements in the range of +10 to 70 ℃
- Ultrasonic cleaner for cleaning the glass probes
■ Optional Hardware Accessories
- Air tank for a surface age range from 20 to 15.000 ms.
■ Key Application Areas
- Determination of the characteristics of surfactants, such as concentration, lifetime, and dynamic surface tension
- Dynamic surface tension and instant wettability of inks and coating fluids
- Determination of the absorbing rate of surfactants to control the dynamic surface tension
- Instant forming of microdroplets with regard to aerosols and emulsifiers
- Determination of instant foaming of detergents and fire extinguishing fluids
| BP-D5 | ||
| Measuring methods | Maximum bubble pressure method | |
| Measuring range | 10 to 100 mN/m | |
| Resolution | 0.01 mN/m | |
| Accuracy1) | 0.5 mN/m | |
| Surface age range of dynamic surface tension | in a time function: 20 to 5.000 ms, optional: 20 to 15.000 ms at a fixed surface age: 20 to 1.000 ms |
|
| Sample volume | about 80 mL | |
| Sample viscosity range | 0.5 to 10 mPa・s | |
| Sample stage operation | by software-controlled pneumatic cylinder | |
| Air supply pressure | 0.4 to 0.7 Mpa | |
| External dimensions (WxDxH) |
320 x 315 x 475 mm | |
| Approximately weight | 18.5 kg | |
| Electric power: Voltage Frequency Power consumption |
AC 100-240 V 50/60 Hz 50 W 80 VA |
|
| Operating environment |
temperature: +10 to +35 ℃, humidity: 30 to 80 %RH (non-condensing) positioned away from sources of electrical noise and vibration |
|
1) Accuracy is the repeatability in terms of standard deviation based on the manufacturer’s prescribed conditions
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DY-700/500
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