Liquid level gauge
US4891980A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 1988 |
| Grant date | Jan 9, 1990 |
| Priority date | — |
| Expiry date | May 26, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/102
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A liquid level gauge comprising a core disposed inside a liquid container that has a cross sectional configuration that varies in the direction of its height, the core extending in the vertical direction and isolated from the liquid, a coil wound around the core in the direction of the length of the core, the coil comprising a densely wound portion formed at one end of the core and a thinly wound portion wound around the remaining part of the core, a conductor ring disposed around the outer circumference of the coil and is movable in the direction of the length of the coil according to the liquid level inside the container, a detecting portion that detects the change in the inductance of the coil according to the displacement of the conductor ring, a transforming portion that transforms the change in the inductance of the coil to a change in an electric signal, and a display portion that displays the quantity of the liquid inside te container, corresponding to the electric signal, the thinly wound portion having a winding density that varies in steps along the length of the core and the display portion displaying a value proportional to the quantity of the liquid inside the contain…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.