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 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) |
CLOSE
