Measuring and testing – Volume or rate of flow – By measuring transit time of tracer or tag
Patent
1984-09-06
1985-12-24
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring transit time of tracer or tag
7386108, G01F 1708
Patent
active
045598312
ABSTRACT:
The invention relates to a method and a device for flow measurements of small liquid volumes through a thin tube. The measurement of small liquid volumes on the order of e.g. 1-500 .mu.l/h is important, especially for medication dispensers. Gas bubbles are fed into the tube, the diameter of the gas bubbles being essentially the same size as the inside diameter of the tube. The liquid flow pushes the gas bubble forward. The flow time of the gas bubble is determined at pre-set measuring points which are located at a predetermined distance from each other along the tube. A control signal may be emitted according to the flow time and may be used to control the flow rate. The method and the device are suitable for electrically conductive liquids, in which variations in the electrical resistance is determined in the direction of the flow when the bubbles enter the measuring section.
REFERENCES:
patent: 1616481 (1927-02-01), Allen
patent: 2683986 (1954-07-01), Bartlett et al.
patent: 3500366 (1970-03-01), Chesney
patent: 3621715 (1971-11-01), Soederkvist et al.
patent: 3739636 (1973-06-01), Versaci et al.
patent: 3898637 (1975-08-01), Wolstenholme
Goldstein Herbert
Jay Mark H.
Siemens Aktiengesellschaft
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