Accurate thermocouple measurement requires correct type selection, matched extension wire, and reliable cold junction compensation. This guide covers IEC 60584 type codes and application ranges, extension wire and compensating cable selection, Phoenix Contact WTOP CJC terminal blocks, Yokogawa YTA110 CJC configuration, and systematic fault diagnosis for open circuit, short circuit, and calibration drift.
Cold junction compensation failure causes ambient-temperature-dependent thermocouple errors that most technicians attribute to instrument drift. This article shows how to identify CJC resistor faults on Allen-Bradley 1756-IT6I2 thermocouple modules and Foxboro FBM04 I/A Series cards, including the compensation formula, multiplexing scan-order errors, and a six-step field verification procedure with calibration tolerances.
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