Differential pressure capillary viscometer for measuring viscosity independent of flow rate and temperature fluctuations
US4627271A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1985 |
| Grant date | Dec 9, 1986 |
| Priority date | — |
| Expiry date | Oct 31, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2030/625
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A means for measuring either the intrinsic or inherent viscosity of a solute in solution with a solvent which is independent of flow rate and temperature fluctuations. The solution is passed through one capillary tube and the solvent through a second capillary, and the pressure drop across each is measured. Signals corresponding to each pressure drop measurement are fed to an amplification means such as a logarithmic amplifier where they are processed to determine either the intrinsic or inherent viscosity of the solute independent of flow rate and temperature fluctuations. The viscosity measuring means may also be used together with size exclusion chromatrography to determine the molecular weight distribution of polymer materials. It may also be used to measure the relative viscosity of a sample liquid and a reference liquid, and to determine the viscosity of the sample liquid independent of flow rate and temperature fluctuations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.