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:
Feb. 24, 2009
Filed:
Dec. 28, 2006
Terrance F. Krouth, Eden Prairie, MN (US);
Rongtai Wang, Eden Prairie, MN (US);
Kris Allen Wendorf, Bloomington, MN (US);
Terrance F. Krouth, Eden Prairie, MN (US);
Rongtai Wang, Eden Prairie, MN (US);
Kris Allen Wendorf, Bloomington, MN (US);
Rosemount Inc., Eden Prairie, MN (US);
Abstract
A field device detects the presence of terminal leakage between a first terminal and a second terminal in the terminal block area of the field device using a voltage variation ratio that is based on variations in a terminal voltage located across output terminals of a field device and variations in a current regulation voltage located within a current regulation circuit. Preferable, the field device measures an initial voltage variation ratio κand a subsequent voltage variation ratio κ. Based on the initial voltage variation ratio κand the subsequent voltage variation ratio κ, the terminal leakage existing between the first terminal and the second terminal can be calculated.