Measuring and testing – Volume or rate of flow – Thermal type
Patent
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.
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Ishikawa Kouichi
Kimura Noriyuki
Mihira Hiroshi
Yamaguchi Masao
Goldstein Herbert
Price Joseph W.
Stec Inc.
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