MATCHING THERMOCOUPLE TYPES TO THE COLOR CODES

Each type of thermocouple has multiple colors associated with it. Standard grade and extension grade wire have their own respective colors, while the positive and negative leads also have associated colors. Here’s a quick rundown of ANSI color specifications.

Type K



Thermocouple Grade Jacket: Brown
Extension Grade Jacket: Yellow
Positive Lead: Yellow
Negative Lead: Red



Type J



Thermocouple Grade Jacket: Brown
Extension Grade Jacket: Black
Positive Lead: White
Negative Lead: Red



Type N



Thermocouple Grade Jacket: Brown
Extension Grade Jacket: Orange
Positive Lead: Orange
Negative Lead: Red



Type R & S



Thermocouple Grade Jacket: No color specified
Extension Grade Jacket: Green
Positive Lead: Black
Negative Lead: Red



Type T



Thermocouple Grade Jacket: Brown
Extension Grade Jacket: Blue
Positive Lead: Blue
Negative Lead: Red



Type E



Thermocouple Grade Jacket: Brown
Extension Grade Jacket: Purple
Positive Lead: Purple
Negative Lead: Red