Robust dynamical method and device for detecting the level of a liquid using resistance temperature detectors
US9810566B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 2015 |
| Grant date | Nov 7, 2017 |
| Priority date | — |
| Expiry date | Feb 29, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/248
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for indicating the level of a liquefied gas in a cryogenic tank having a resistance temperature detector (1). The controller applies a heating pulse to the detector and performs a single resistance measurement after the heating pulse. The overheating of the sensor and the time interval for the measurement are found in a separate set of test experiment. As a result, for temperature sensors with negative temperature coefficient, the resistance of the sensor in gas is below some unique characteristic value, which can be used like a threshold criterion to distinguish between the liquid and the gas in a wide temperature range. For sensors with positive temperature coefficient, the resistance of the sensor in gas is larger than some unique characteristic value, which can be used like a threshold criterion to distinguish between the liquid and the gas in a wide temperature range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.