Drop by Drop More Precise:
The LAUDA Drop Volume Tensiometer TVT 2
Technical data:
Measuring range | mN/m | 0.1...100 |
Resolution | ||
- Resolution | µm | ± 0.1 |
- Volume | µl | ± 0.01 |
- Surface/interfacial tension | mN/m | ± 0.01 |
- Drop formation time | s | ± 0.1 |
Reproducibility of individual drops for pure liquids (mechanical tolerances): | ||
- Stroke | µm | < 2.5 |
- Volume (based on syringe volume) | ‰ µl | 0.07 |
- Surface tension | mN/m | ± 0.08 x syringe volume [ml] (1) |
- Interfacial tension | The above value must be multiplied by &Delta (density difference) | |
- Drop formation time for t | s | ± 0.1 ... 0.5 |
Reproducibility of mean value over 5 drops | ||
- Surface tension (depending on syringe and needle type) | mN/m | ± 0.01 ... 0.05 |
Absolute accuracy | approx. 0.5% of end value of surface tension | |
Drop times | s/µl | 0.04 (at 5 ml) 170 (at up to 0.25 ml) |
Speed control | < 1 % | |
Temperature range | °C | 5...90 (with special thermostating block) |
Interfaces | RS 232 | |
Dimensions of TVT 2 measuring desk (WxDxH) | mm | 220 x 240 x 555 |
Dimensions of TVT 2 control unit (WxDxH) | mm | 340 x 270 x 105 |
Weight of TVT 2 measuring desk | kg | 8.0 |
Weight of TVT 2 control unit | kg | 4.2 |
Power consumption | W | 0.1 |
Power supply | V; Hz | 80...230; 50/60 |
(1) this means, for instance:
Syringe volume [ml] | 0.25 | 0.5 | 1 | 2.5 | 5 |
Ds[mN/m] | ± 0.02 | ± 0.04 | ± 0.08 | ± 0.16 | ± 0.32 |
(2) depending on drop size and discharge speed
Standard accessories
- Software
- RS 232 cable
- Mains cable
- Connecting cable for measurement desk/control unit
- Light barrier cable (transmitter and receiver)
- Syringe 2.5 ml
- Standard needle SK1
- Cell
- Thermostating block(60 °C or 90 °C model)
- Allen key
- Cell handling tool
Optional accessories
- Syringe with various volumes
- Thermostating block (max. 60 °C or alternatively 90 °C)
- Spare screw cap for needles
- Temperature probe
- Cell handling tool
- Adapter
- RS 232 cable
- Steel needles
- Reverse needles
- Glass needles
- Cell (heat-proof glass)
- Reverse measuring set
Metrological Standards
- ISO 9101
- ASTM D2285