Method and apparatus for measuring a fluid
US6125695A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1997 |
| Grant date | Oct 3, 2000 |
| Priority date | — |
| Expiry date | Oct 13, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/6847
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A flow sensor including a symmetrical sensor tube for carrying the fluid, first and second heaters symmetrically disposed at the sensor tube, and a first temperature sensor in thermal communication with the fluid. A flow meter including a flow sensor having a sensor tube, a first heater disposed at the sensor tube, a second heater disposed at the sensor tube, and a first temperature sensor in thermal communication with the fluid. The meter also includes a circuit for selectively applying power to the first and second heaters to maintain a temperature difference between a temperature of the first and second heaters and the temperature of the fluid, and for determining a difference in power supplied to the first and second heaters. A method including providing first and second heaters at a temperature a fixed amount above a temperature of the fluid; determining a difference in power supplied to the first and second heaters; and determining a measurement of the fluid from the difference in power supplied to the first and second heaters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.