Thermocouple Type

ANSI Color Code

Initial Calibration Tolerances

Wire Alloys

Calibration

+/- Conductor

Overall

Temperature Range

Standard Limits

Special Limits

Iron(+) vs. Constantan(-)

J

White/Red

Brown

0°C to +285°C 285°C to +750°C

±2. 2°C ± . 75%

±1. 1°C ± . 4%

CHROMEL(+) vs. ALUMEL(-)

K

Yellow/Red

Brown

-200°C to -110°C -110°C to 0°C 0°C to +285°C 285°C to +1250°C

± 2% ±2. 2°C ±2. 2°C ± . 75%

±1. 1°C ± . 4%

Copper(+) vs. Constantan(-)

T

Blue/Red

Brown

-200°C to -65°C -65°C to +130°C 130°C to +350°C

± 1. 5% ±1°C ± . 75%

± . 8% ± . 5°C ± . 4%

CHROMEL(+) vs. Constantan(-)

E

Purple/Red

Brown

-200°C to -170°C -170°C to +250°C 250°C to +340°C 340°C+900°C

± 1% ±1. 7°C ±1. 7°C ± . 5%

±1°C ±1°C ± . 4% ± . 4%