High viscosity transducer for vibratory viscometer
US5317908A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1992 |
| Grant date | Jun 7, 1994 |
| Priority date | — |
| Expiry date | Apr 28, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N11/162
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A transducer for inline process control of highly viscous fluids at high pressure and high temperature having a torsionally oscillating sensor tip supported by a pressure resistant threaded body portion. The sensor tip, which includes a thermocouple to measure fluid temperature, is driven by a crossarm which oscillates with a constant angular amplitude, the power required to maintain that amplitude despite the viscous resistance offered by the fluid being a measure of the viscosity-density product of the fluid. The crossarm driver and detector electromagnetic coils are oriented at right angles to each other to reduce crosstalk and transducer housing diameter. The associated electronic control unit includes means to compensate for the effects of fluid flow rate and fluid pressure which were found to be encountered with the vibratory viscometer method of measurement when inline measurements are made on high viscosity fluids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.