THERMOCOUPLE MODULE WITH WIRE RESISTANCE COMPENSATION
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United States of America Patent
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app pub date -
May 7, 2014
filing date -
Mar 27, 2014
priority date (Note) -
Abandoned
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Abstract
An interface circuit is provided for an Input/Output (I/O) module in an industrial controller to compensate for voltage generated by a bias current in a thermocouple. During a calibration routine, the interface circuit supplies two known bias currents to a thermocouple and measures a voltage generated across the thermocouple as a result of each bias current. The measured voltages and known current values are used to determine the resistance value of the thermocouple leads. Using two known bias currents provides for an accurate measurement of the resistance value of the thermocouple leads when the thermocouple is generating a voltage corresponding to the measured temperature. Either the I/O module or the industrial controller may determine a voltage resulting from the bias current applied to the thermocouple during operation as a function of the measured resistance and compensate the voltage measured at the thermocouple leads to accurately determine the measured temperature.
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