Method of measuring flow rate and flow meter for use in said met

Details Method of measuring flow rate and flow meter for use in said met Method of measuring flow rate and flow meter for use in said met

1989-04-14

1990-08-14

Cohan, Alan

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

7320416, G05D 912

Patent

active

049478893

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 measurment 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: 3142170 (1964-07-01), Calhoun
patent: 4016759 (1977-04-01), Baker
patent: 4487213 (1984-12-01), Gates
patent: 4679585 (1987-07-01), Ewing
patent: 4685331 (1987-08-01), Renken
patent: 4831876 (1989-05-01), Porth

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