Specific gravity independent gauging of liquid filled tanks
US4446730A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 1982 |
| Grant date | May 8, 1984 |
| Priority date | — |
| Expiry date | Apr 26, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/806
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A liquid sensing and gauging method and apparatus employing a differential pressure sensing device located near the bottom of the tank and an absolute pressure sensing device located at the same level as one of the differential pressure sensing device elements. The differential sensing device is connected for driving the arm of a potentiometer included in an electronic circuit to develop an intermediate voltage exponentially proportional to the reciprocal of the specific gravity of the tank liquid. Similarly, the absolute pressure sensing device is connected for driving the arm of a potentiometer which is biased by the intermediate voltage. The output on this arm is then indicative of the height of the tank liquid only, regardless of the specific gravity of the liquid. The height level output can be multiplied by an area voltage to indicate tank volume. This tank volume voltage can be added to other similar outputs to indicate total system volume of a system comprising a plurality of tanks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.