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:
Nov. 26, 2013
Filed:
Dec. 02, 2010
Axel Kramer, Wettingen, CH;
Daniel Schrag, Lufingen, CH;
Detlef Pape, Nussbaumen, CH;
Kai Hencken, Loerrach, DE;
Julio Danin Lobo, Baden, CH;
Axel Kramer, Wettingen, CH;
Daniel Schrag, Lufingen, CH;
Detlef Pape, Nussbaumen, CH;
Kai Hencken, Loerrach, DE;
Julio Danin Lobo, Baden, CH;
ABB Research Ltd., Zurich, CH;
Abstract
A method and an apparatus for diagnosis of a flowmeter are disclosed. The method includes thermally coupling a first sensor unit of the flowmeter to a fluid and thermally coupling a second sensor unit of the flowmeter to the fluid. The method also includes actively heating or cooling the first sensor unit by applying power to the first sensor unit such that its temperature is different from the temperature of the fluid, and simultaneously actively heating or cooling the second sensor unit by applying power to the second sensor unit such that its temperature is different from the temperature of the fluid, and typically from the temperature of the first sensor. The method can include determining a temperature TMof the fluid, and determining at least two independent quantities related to the heat transfer of the sensor units, each of the at least two independent heat transfer related quantities being determined from at least one element selected from the group including TM, TM, TM, PM, and PM, and determining a diagnosis result by setting into relation the at least two independent heat transfer related quantities.