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:
Jun. 26, 1990
Filed:
May. 31, 1989
Charles E Goetzinger, Bloomington, MN (US);
Rosemount Inc., Eden Prairie, MN (US);
Abstract
A transmitter generates an output signal, which represents temperature, based on potential across thermocouple leads from a main thermocouple. A housing has first and second terminals extending through a wall which separates first and second cavities in the housing. The terminals are connected to the thermocouple leads in the first cavity to form terminal cold junctions. A converter has converter leads which are connected to the terminals in the second cavity. The converter senses a combined signal which represents main thermocouple potential and terminal cold junction potential. The converter also provides the output signal. A conductor has a first end coupled to the first terminal and a second end coupled to the converter forming a correction thermocouple. The correction thermocouple provides a first correction signal representing a difference between a terminal temperature and a converter temperature. A sensor on the converter provides a converter temperature signal which represents the converter temperature. The converter provides the output signal as a function of the converter temperature signal, the first correction signal, and the combined signal.