Surface Tension Measurement » LAUDA Drop Volume Tensiometer TVT 2

Technical data

• Applications
• Advantages
• Method
• Software
• 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 δ (density difference)
- Drop formation time for t <100 s (2)	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