Electronic flowmeter system and method

Details Electronic flowmeter system and method Electronic flowmeter system and method

1988-05-11

1989-12-12

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Using rotating member with particular electrical output or...

7386189, 364510, G01F 112

Patent

active

048859435

ABSTRACT:
An electronic flowmeter system including a turbine flowmeter and a digital controller for making highly accurate flow measurements over a wide range of fluid flows and pressures. The flowmeter preferably includes a housing or body having a cylindrical bore in which is mounted a turbine having multiple vanes, and which preferably rotates transversely to the direction of fluid flow. The clearance between the bore and outer edge of the vanes is selected for minimum resistance to extremely low flow rates. Rotation of the turbine vanes is detected by use of a proximity sensor or an optical sensor employing an artificial light source and a photodetector. Fiber optics may be used to locate the light source and photodetector at a location remote from the flowmeter for high temperature or intrinsically safe applications. Flow measurements are made by digitally measuring the time periods between successive input generated by detection of the rotating vanes of the turbine. The microprocessor-based controller compensates for nonlinearities between turbine rotation rate and the actual flow rates by applying correction factors in the form of range-dependent linear approximation values. A preferred method for operating such a flowmeter system is also disclosed.

REFERENCES:
patent: 3936663 (1976-02-01), Taylor et al.
patent: 3965341 (1976-06-01), Honey et al.
patent: 4306457 (1981-12-01), Fukui et al.
patent: 4458539 (1984-07-01), Bilstad
patent: 4581946 (1986-04-01), Kanayama
patent: 4593365 (1986-06-01), Haley, Jr. et al.

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