The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 20, 2003
Filed:
Dec. 19, 2001
Hartmut Stark, Stockelsdorf, DE;
Abstract
A device for measuring the flow of a fluid located in a fluid channel heats the fluid channel without additional components. A metallic tube ( ) with predetermined thermoelectric potential is provided as a fluid channel. An a.c. power source ( ) is connected to a partial section ( ) of the tube ( ) in such a manner that the partial section ( ) is heated as a resistor element to an increased working temperature compared with the temperature of the fluid. At least one thermocouple ( ) is provided with junction points formed along the partial section ( ) in such a manner that at least two wires ( ) with another thermoelectric potential are connected to the tube ( ) in the area of the partial section ( ). A measuring circuit ( ) evaluates the thermocouple voltage of the thermocouple ( ) and has a circuit ( ) which eliminates the a.c. voltage component superimposed to the thermocouple voltage as a consequence of the a.c. heating. The thermocouple voltage yields the measured variable corresponding to the flow.