Apparatus and method continuous measurement of the electrical conductivity of liquid media in a dynamic cell
US5025219A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 19, 1989 |
| Grant date | Jun 18, 1991 |
| Priority date | — |
| Expiry date | Sep 19, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R27/22
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for providing a precise, continuous, and dynamic measurement of the electrical resistivity of a liquid medium. A dynamic measurement cell is provided with at least one conduit of electrically insulating material in which a conductive electrode slides with a motion of given amplitude. The lower portion of the conduit is calibrated over a length equal to at least the given amplitude, and has a known cross-section. The cell is immersed in a crucible containing the liquid medium for test at constant temperature to monitor various electric parameters. The monitoring system provides devices for controlling, adjusting, and measuring the amplitude and speed of the displacement of the electrode; measuring and adjusting the depth of immersion of the electrodes; and, measuring the variation, in ohmic resistance, of the cell as a function of the displacement of the electrodes. The conductivity is determined by an equation proportional to the ratio of the change in amplitude to the change in resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.