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ANSI and IEC color Codes and limits of error for Thermocouples, Wire and Connectors

View the printable Thermocouple colorcode chart
(Printable version also contains international color codes)

All Omega Thermocouple Wire, Probes and Connectors are available with either ANSI or IEC color Codes. Please contact sales for instructions on how to order color-Coded products. More information about thermocouple wire.

ANSI
Code
Alloy Combination
Color Coding    
Maximum Useful
Temperature
Range ++
Maximum
Thermocouple Grade
Temperature
Range
EMF (mV)
Over Max.
Temperature
Range
Standard Limits
of Error**
(above O°C)
Special
Limits of Error**
(above O°C)
International
IEC 584-3
Comments
Environment —
Bare Wire
IEC
Code
+ Lead - Lead Thermocouple
Grade
Extension
Grade
J IRON
Fe
(magnetic)
CONSTANTAN
COPPER-NICKEL
Cu-Ni
Thermocouple Color Codes Thermocouple Grade:
32 to 1382°F
0 to 750°C
Extension Grade:
32 to 392°F
0 to 200°C
–346 to 2193°F
–210 to 1200°C
–8.095 to
69.553
greater of
2.2°C or 0.75%
greater of
1.1°C or 0.4%
Reducing, Vacuum, Inert.
Limited Use in Oxidizing
at High Temperatures.
Not Recommended for
Low Temperatures.
J
K CHROMEGA®
NICKELCHROMIUM
Ni-Cr
ALOMEGA®
NICKEL-ALUMINUM
Ni-AI
(magnetic)
Thermocouple Grade:
–328 to 2282°F
–200 to 1250°C
Extension Grade:
32 to 392°F
0 to 200°C
–454 to 2501°F
–270 to 1372°C
–6.458 to
54.886
greater of
2.2°C or 0.75%
greater of
1.1°C or 0.4%
Clean Oxidizing and Inert.
Limited Use in Vacuum or
Reducing. Wide Temperature
Range, Most Popular Calibration
K
T COPPER
Cu
CONSTANTAN
COPPER-NICKEL
Cu–Ni
Thermocouple Grade:
–328 to 662°F
–250 to 350°C
Extension Grade:
–76 to 212°F
–60 to 100°C
–454 to 752°F
–270 to 400°C
–6.258 to
20.872
greater of
1.0°C or 0.75%
greater of
0.5°C or 0.4%
Mild Oxidizing,
Reducing Vacuum or Inert. Good
Where Moisture Is
Present. Low Temperature and
Cryogenic Applications
T
E CHROMEGA®
NICKELCHROMIUM
Ni-Cr
CONSTANTAN
COPPER-NICKEL
Cu-Ni
Thermocouple Grade:
–328 to 1652°F
–200 to 900°C
Extension Grade:
32 to 392°F
0 to 200°C
–454 to 1832°F
–270 to 1000°C
–9.835 to
76.373
greater of
1.7°C or 0.5%
greater of
1.0°C or 0.4%
Oxidizing or Inert.
Limited Use in Vacuum
or Reducing.
Highest EMF Change
Per Degree
E
N OMEGA-P®
NICROSIL
Ni-Cr-Si
OMEGA-N®
NISIL
Ni-Si-Mg
Thermocouple Grade:
–450 to 2372°F
–270 to 1300°C
Extension Grade:
32 to 392°F
0 to 200°C
–450 to 2372°F
–270 to 1300°C
–4.345
to 47.513
greater of
2.2°C or 0.75%
greater of
1.1°C or 0.4%
Alternative to Type K.
More Stable
at High Temps
N
R PLATINUM-
13% RHODIUM
Pt-13% Rh
PLATINUM
Pt
NONE
ESTABLISHED
Thermocouple Grade:
32 to 2642°F
0 to 1450°C
Extension Grade:
32 to 300°F
0 to 150°C
–58 to 3214°F
–50 to 1768°C
–0.226
to 21.101
greater of
1.5°C or 0.25%
greater of
0.6°C or 0.1%
Oxidizing or Inert.
Do Not Insert in Metal Tubes.
Beware of Contamination.
High Temperature
R
S PLATINUM-
10% RHODIUM
Pt-10% Rh
PLATINUM
Pt
NONE
ESTABLISHED
Thermocouple Grade:
32 to 2642°F
0 to 1400°C
Extension Grade:
32 to 300°F
0 to 150°C
–58 to 3214°F
–50 to 1768°C
–0.236
to 18.693
greater of
1.5°C or 0.25%
greater of
0.6°C or 0.1%
Oxidizing or Inert.
Do Not Insert in Metal Tubes.
Beware of Contamination.
High Temperature
S
U COPPER
Cu
COPPER-LOW
NICKEL
Cu-Ni
NONE
ESTABLISHED
Extension Grade:
32 to 122°F
0 to 50°C
        Extension Grade
Connecting Wire for
R and S Thermocouples,
Also Known as RX and SX
Extension Wire.
U
B PLATINUM-
30% RHODIUM
Pt-30% Rh
PLATINUM-
6% RHODIUM
Pt-6% Rh
NONE
ESTABLISHED
Thermocouple Grade:
32 to 3092°F
0 to 1700°C
Extension Grade:
32 to 212°F
0 to 100°C
32 to 3308°F
0 to 1820°C
0 to 13.820 0.5% over 800°C NOT
ESTABLISHED
  Oxidizing or Inert.
Do Not Insert in Metal Tubes.
Beware of Contamination.
High Temperature. Common Use
in Glass Industry
B
G*
(W)
TUNGSTEN
W
TUNGSTEN-
26% RHENIUM
W-26% Re
NONE
ESTABLISHED
Thermocouple Grade:
32 to 4208°F
0 to 2320°C
Extension Grade:
32 to 500°F
0 to 260°C
32 to 4208°F
0 to 2320°C
0 to 38.564 greater of
4.5°C or 1.0%
NOT
ESTABLISHED
  Vacuum, Inert, Hydrogen.
Beware of Embrittlement.
Not Practical Below
399°C (750°F).
Not for Oxidizing Atmosphere
G
(W)
C*
(W5)
TUNGSTEN-
5% RHENIUM
W-5% Re
TUNGSTEN-
26% RHENIUM
W-26% Re
NONE
ESTABLISHED
Thermocouple Grade:
32 to 4208°F
0 to 2320°C
Extension Grade:
32 to 1600°F
0 to 870°C
32 to 4208°F
0 to 2320°C
0 to 37.066 greater of
4.5°C or 1.0%
NOT
ESTABLISHED
  Vacuum, Inert, Hydrogen.
Beware of Embrittlement.
Not Practical Below
399°C (750°F)
Not for Oxidizing Atmosphere
C
(W5)
D*
(W3)
TUNGSTEN-
3% RHENIUM
W-3% Re
TUNGSTEN-
25% RHENIUM
W-25% Re
NONE
ESTABLISHED
Thermocouple Grade:
32 to 4208°F
0 to 2320°C
Extension Grade:
32 to 500°F
0 to 260°C
32 to 4208°F
0 to 2320°C
0 to 39.506 greater of
4.5°C or 1.0%
NOT
ESTABLISHED
  Vacuum, Inert, Hydrogen.
Beware of Embrittlement.
Not Practical Below
399°C (750°F)–Not for
Oxidizing Atmosphere
D
(W3)
++ Except as further restricted by temperature limits for T/C diameter and insulation tables that follow.
* Not official symbol or standard designation.
** For controlled initial accuracy below 0°C, ask OMEGA's sales Department for a CAL-4 calibration report.

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