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:
Apr. 05, 2011
Filed:
Oct. 06, 2008
Robert C. Hedtke, Young America, MN (US);
Charles R. Willcox, Eden Prairie, MN (US);
David A. Broden, Andover, MN (US);
Andrew Juri Klosinski, Waconia, MN (US);
John P. Schulte, Eden Prairie, MN (US);
Robert C. Hedtke, Young America, MN (US);
Charles R. Willcox, Eden Prairie, MN (US);
David A. Broden, Andover, MN (US);
Andrew Juri Klosinski, Waconia, MN (US);
John P. Schulte, Eden Prairie, MN (US);
Rosemount Inc., Eden Prairie, MN (US);
Abstract
A process transmitter for measuring a process variable in an industrial process comprises a sensor module, a heating device and transmitter circuitry. The sensor module has a sensor for sensing a process variable of an industrial process and generating a sensor signal. The heating device is connected to the sensor module for generating a heat pulse to influence generation of the sensor signal. The transmitter circuitry is connected to the sensor and the heating device. The transmitter circuitry verifies operation of the sensor by measuring a change in the sensor signal due to the heat pulse. In one embodiment of the invention, the heat pulse thermally expands a volume of a fill fluid within the process transmitter. In another embodiment, the heat pulse changes a physical property, such as dielectric, of a fill fluid within the process transmitter.