Thermal system for measuring liquid levels
US4590797A · kind A · utility
34Cited by
6References
6Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Sep 24, 1984 |
| Grant date | May 27, 1986 |
| Priority date | — |
| Expiry date | Sep 24, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7306
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A thermal liquid level measuring system including a heat sensor with a sheathed heating resistor and a measuring resistor. Power is supplied to the heating resistor in a series of pulses. The measuring resistor is connected to two filters which extract the a.c. and d.c. components from the measuring signal. A temperature measuring device determines the difference in temperature of the liquid and the gas above the liquid. A computer receives signals from the filters and the temperature measuring device to determine the level of the liquid and its temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.