RF Admittance measuring method and apparatus for determining the level of a conductive liquid
US4166388A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1977 |
| Grant date | Sep 4, 1979 |
| Priority date | — |
| Expiry date | Dec 12, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/263
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Various probes which are adapted to measure the liquid level in a vessel including the flow rate through a channel comprise a conductive probe electrode and guard electrode means including a rear portion located between the wall of the vessel and the probe electrode and a lateral portion extending outwardly from the lateral extremities of the probe electrode. The probe electrode and the guard electrode means are separated by interior solid insulation and an exterior solid insulation covers the probe so as to separate the guard electrode means and the probe electrode from the conductive liquid. By driving the guard electrode means at substantially the same potential as the probe electrode, the portion of a conductive coating which has accumulated at the lateral portions of the guard electrode means may be capacitively coupled to the potential of the guard electrode means thereby reducing the adverse effect of a conductive coating which has accumulated at the probe electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.