Measuring and testing – Volume or rate of flow – Thermal type
Patent
1997-10-13
2000-10-03
Fuller, Benjamin R.
Measuring and testing
Volume or rate of flow
Thermal type
G01F 168
Patent
active
061256951
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.
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Alvesteffer William J.
Eget Larry
Huang Yufeng
Fuller Benjamin R.
Pugh R. J.
Teledyne Brown Engineering, Inc.
Thompson Jewel V.
Viccaro P. J.
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