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. 10, 2015
Filed:
Jul. 08, 2010
David L. Wehrs, Eden Prairie, MN (US);
Gregory J. Lecuyer, Eden Prairie, MN (US);
Jessica Lo, Robbinsdale, MN (US);
Steven J. Mccoy, Eden Prairie, MN (US);
Brian L. Westfield, Victoria, MN (US);
David L. Wehrs, Eden Prairie, MN (US);
Gregory J. LeCuyer, Eden Prairie, MN (US);
Jessica Lo, Robbinsdale, MN (US);
Steven J. McCoy, Eden Prairie, MN (US);
Brian L. Westfield, Victoria, MN (US);
Rosemount Inc., Eden Prairie, MN (US);
Abstract
A two-wire process variable transmitter for use in an industrial process, including a process variable sensor configured to sense a process variable of a fluid of the industrial process. Output circuitry is configured to provide an output on a two-wire process control loop which is related to the sensed process variable. Loop current measurement circuitry measures a loop current flowing through the two-wire process control loop and terminal voltage measurement circuitry measures a voltage related to a terminal voltage of the process variable transmitter. The terminal voltage can be a voltage measured across an electrical connection of the two-wire process variable transmitter to the two-wire process control loop. Input circuitry is configured to receive a diagnostic command from the two-wire process control loop. A microprocessor configured to perform loop diagnostics on the two-wire process control loop based upon the measured loop current and terminal voltage in response to receipt of a diagnostic command from the two-wire process control loop.