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Surface Tension Measurement » LAUDA Drop Volume Tensiometer TVT 2

Technical data

Measurement (Units)
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

Measurement (Units)

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