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ANSI/ISA Thermocouple Color Codes

Type Material Color Code Overall Jacket
Extension Grade Positive Wire Negative Wire Positive Wire Negative Wire Extension Grade
JX J Iron Constantan White Red Black Brown
KX K Chromel Alumel Yellow Red Yellow Brown
TX T Copper Constantan Blue Red Blue Brown
EX E Chromel Constantan Purple Red Purple Brown
RX, SX --- Copper Copper Alloy #11 Black Red Green N/A

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