Gravimetric Capillary Viscometer / Houillon semi-automatic
Houillon viscometer models are further developments of manual glass capillaries. They use Z-shaped capillaries which are referred to as 'tubes'. These tubes are specially designed for small sample volume and fast flow times. On the other hand, Houillon viscometers are less precise than classic glass capillary viscometers and the measuring range of one specific capillary is even smaller than of one e.g. Ubbelohde type tube. Precise filling with an exactly defined volume needs to be done manually. Depending on the model, measuring as well as cleaning and drying are performed automatically. Some systems can be configured for up to 16 simultaneous test runs.
Temperature control is done with thermostat baths. Precise temperature equilibration takes typically several hours.
According to ASTM D7279 each Houillon capillary is specified for a measuring range based on the so-called most practical flow time of 30 to 200 s for this capillary. So each Houillon capillary can cover a range defined by its minimum viscosity times a factor of approximately 3. For example, the range for one capillary is 15 mm2/s to 50 mm2/s.
- Viscosity measuring range - with 16 capillaries: 2 mm2/s to 2,000 mm2/s
- Repeatability: approx. 2 %
- Temperature measuring range: +20°C (68°F) to +120°C (248°F)
Sample throughput - max./hour for manual operation:
- up to 75
Temperature control is done with a liquid bath thermostat.
- Typical sample volume: < 1 mL
- Houillon viscometers are suitable for transparent and opaque samples.
Standards and Norms
|Viscometer type||Houillon Viscometer|
|Measuring principle||Gravimetric Capillary Viscometer|
|Calculated quantity||kinematic viscosity|
|Viscosity range - min||2 mm²/s|
|Viscosity range - max||2000 mm²/s|
|Temperature - min||+20°C|
|Temperature - max||+120°C|
|Liquid bath thermostat required||yes|
|Temperature change with same filling||no|
|Sample volume - typical||< 1 mL|
|Solvent volume - typical||< 10 mL|
|Sample throughput - max / h||up to 75|
|Measuring accuracy||approx. 2 %|
|Shear rate control||no|
|Shear rate calculation||no|
|Lab space||approx. 0.5 m²|
|Standards and norms||ASTM D7279|
We offer typical values which are based on the values in brochures and standards but are not related to specific instruments.