Flow meter for measuring fluid flow with multiple temperature se

Details Flow meter for measuring fluid flow with multiple temperature se Flow meter for measuring fluid flow with multiple temperature se

1990-01-05

1991-09-17

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

7320424, G01F 168

Patent

active

050483323

ABSTRACT:
A part of a tube, through which a fluid passes, is cooled by means of an electronic cooling element and a flow rate of the fluid is measured on the basis of a temperature of a surface of the tube cooled. Not only can the flow rate of the liquid flowing through the tube be determined in a noncontacting manner and a very small flow rate of the liquid be determined, but also the tube is cooled so that no bubbles are generated, and thus the measurement of the liquid, which is apt to generate gases, such as low boiling point liquid, is possible. In addition, the measurement is not influenced by the gases dissolved in the liquid and merely the temperature difference resulting from the flow of the fluid, that is, the rise of the temperature of the fluid, is detected to prevent the measurement from being influenced by the installing posture of the flow meter, so that a highly accurate measurement is possible. Consequently, stable and sure controlling flow rate of liquid is possible.

REFERENCES:
patent: 2729976 (1956-01-01), Laub
patent: 3142170 (1964-07-01), Calhoun
patent: 3336804 (1967-08-01), Poppendier et al.
patent: 4016759 (1977-04-01), Baker et al.
patent: 4135396 (1979-01-01), Stanke et al.
patent: 4339949 (1982-07-01), Bahner et al.
patent: 4384578 (1983-05-01), Winkler
patent: 4487213 (1984-12-01), Gates et al.
patent: 4679585 (1987-07-01), Ewing
patent: 4685331 (1987-08-01), Renken et al.
patent: 4831876 (1989-05-01), Porth et al.

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