www.omega.com * TC Color Codes

ANSI Code Alloy Combination Color 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

E CHROMEGA NICKEL- CHROMIUM
Ni-Cr CONSTANTAN COPPER- NICKEL
Cu-Ni P R B Plug P R P Plug -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%

N OMEGA-P NICROSIL
Ni-Cr-Si OMEGA-N NISIL
Ni-Si-Mg O R B Plug O R O Plug -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%

R PLATINUM
13% RHODIUM
Pt-13% Rh PLATINUM
PT NONE ESTABLISHED K R G Plug 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%

S 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 International
IEC 584-3 International
IEC 584-3
Intrinsically Safe CZECH
BRITISH
to
BS 1843 NETHERLANDS
GERMAN
to DIN 43710 JAPANESE
to
JIS C
1610-1981 FRENCH
to
NFC 42-324 Comments
Environment -
Bare Wire

E P W P Plug P W Bl Plug B Bl B Plug R K K Plug R W P Plug Y P P Plug Oxidising or Inert. Limited Use in Vacuum or Reducing. Highest EMF Change per Degree

N Pk W Pk Plug Pk W Bl Plug O Bl O Plug No Standard
Use American Color Codes Alternative To Type K
More Stable at High Temps

R O W O Plug O W Bl Plug W Bl G Plug R W W Plug R W K Plug Y G G Plug 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

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 Color 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

International Thermocouple Color Codes — Thermocouple and Extension Grade Wires

International Thermocouple Color Codes —
Thermocouple and Extension Grade Wires