Enhancing thermocouple temperature measurement accuracy with local RTDs to compensate terminal temperature difference
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United States of America Patent
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Mar 31, 2015
Grant Date -
Jul 12, 2012
app pub date -
Jan 11, 2012
filing date -
Jan 12, 2011
priority date (Note) -
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Abstract
An I/O circuit for measuring temperatures uses multiple cold-junction compensation sensors permanently affixed near the terminals of the terminal block in order to compensate significant temperature variation across the terminals of the I/O module (up to 3° C.) that can substantially affect the accuracy of thermocouple measurements. The use of these multiple sensors is enabled by a compensation system that corrects for the distance between the built-in sensors and the terminals, a multiplexer that accommodates the additional signal burden produced by the sensors, and a compensation system that allows low-cost sensors to be used and calibrated to as little as a single high accuracy sensor. In one embodiment, a third temperature sensor with relatively higher accuracy is used to compensate for lower accuracy of permanently affixed sensors.
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