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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

IRON
Fe
(magnetic)

CONSTANTAN
COPPER-NICKEL
Cu-Ni

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.

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

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

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

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

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

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

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.

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

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)

Wire Color Codes and Limits of Error