International Thermocouple Colour Codes —
Thermocouple and Extension Grade Wires

ANSI Code

Alloy Combination

Colour Coding

Maximum Temperature Useful Range

EMF (mV) Over Max. Temperature Range

Limits of Error**
(Whichever is Greater)

+Lead

-Lead

Thermocouple Grade

Extension Grade

Standard

Special

CHROMEGA NICKEL- CHROMIUM
Ni-Cr

CONSTANTAN COPPER- NICKEL
Cu-Ni

-200 to 900°C
(-328 to 1652°F)
Therm. Grade
0 to 200°C
(32 to 392°F)
Ext. Grade

-9.835 to 76.373

-200 to 900°C (-328 to 1652°F)

1.7°C or 0.5%
Above 0°C
1.7°C or 1.0%
Below 0°C

1.0°C or 0.4%

OMEGA-P NICROSIL
Ni-Cr-Si

OMEGA-N NISIL
Ni-Si-Mg

-270 to 1300°C
(-450 to 2372°F)
Therm. Grade
0 to 200°C
(32 to 392°F)
Ext. Grade

-4.345 to 47.513

2.2°C or 0.75%
Above 0°C
2.2°C or 2.0%
Below 0°C

1.1°C or 0.4%

PLATINUM
13% RHODIUM
Pt-13% Rh

PLATINUM
PT

NONE ESTABLISHED

0 to 1450°C
(32 to 2642°F)
Therm. Grade
0 to 150°C
(32 to 300°F)
Ext. Grade

-0.226 to 21.101

0 to 1450°C (32 to 2642°F)

1.5°C or 0.25% 0.6°C or 0.1%

PLATINUM
10% RHODIUM
Pt-10% Rh

PLATINUM
PT

NONE ESTABLISHED

0 to 1450°C
(32 to 2642°F)
Therm. Grade
0 to 150°C
(32 to 300°F)
Ext. Grade

-0.236 to 18.693

0 to 1450°C (32 to 2642°F)

1.5°C or 0.25% 0.6°C or 0.1%

ANSI CODE	NETHERLANDS GERMAN to DIN 43710	Comments Environment - Bare Wire

E		Oxidising or Inert. Limited Use in Vacuum or Reducing. Highest EMF Change per Degree
N	No Standard Use American Colour Codes	Alternative To Type K More Stable at High Temps
R		Oxidising or Inert. Do Not Insert in Metal Tubes. Beware of Contamination. High Temperature
S		Oxidising or Inert. Do Not Insert in Metal Tubes. Beware of Contamination. High Temperature