Device for measuring the flow in a fluid channel

Details Device for measuring the flow in a fluid channel Device for measuring the flow in a fluid channel

1995-11-30

1997-10-14

Chilcot, Richard

Measuring and testing

Volume or rate of flow

Thermal type

7320417, 7317012, G01F 168

Patent

active

056774842

ABSTRACT:
A device for measuring the flow of a fluid in a fluid channel, with at least one thermocouple, whose thermojunctions are arranged one behind the other in the direction of flow of the fluid and are maintained at a working temperature higher than the fluid temperature by means of an ac power source 9. The thermocouple is connected to a measuring circuit evaluating the thermocouple voltage U.sub.T. Continuous measurement with high accuracy is possible with a measuring circuit having a switching network, by which the ac power source is connected to the thermocouple at least during the measurement phase, and by which the ac voltage components superimposed to the thermocouple voltage are eliminated by subtraction.

REFERENCES:
patent: 3580074 (1971-05-01), Wescott
patent: 4782708 (1988-11-01), Harrington et al.
patent: 4807151 (1989-02-01), Citron
patent: 4821700 (1989-04-01), Weibler et al.
patent: 5119674 (1992-06-01), Nielsen
patent: 5313831 (1994-05-01), Beckamn
patent: 5493906 (1996-02-01), Sen-Zhi

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