Patent 7046180 was granted and assigned to Rosemount Inc. on May, 2006 by the United States Patent and Trademark Office.
A circuit includes a multiplexer, an analog-to-digital converter, and a processor that compares a sequence of digital outputs from the analog-to-digital converter to a sequence of normal ranges that correspond with the digital outputs in order to provide an error output when one of the digital outputs is outside its normal range.