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Thermocouple Color Codes

Select the right
type of thermocouple


Thermocouple types, often referred to as calibrations, determine sensitivity, optimal temperature range and indicate the materials used in a thermocouple composition. T/C types are represented by different colors.

Use this tool to choose the right type of thermocouple calibration for a temperature range. You can also download the reference table, or chat with one of our engineers.



THERMOCOUPLE SELECTOR
Enter the temperature range
Leave blank to see all ranges or if temp. unknown
°F
UNIT
°C
ANSI
COLOR CODE
IEC
REFRESH VIEW RESULTS
RESULTS
J Type J Thermocouples
Reducing, Vacuum, Inert. Limited Use in Oxidizing at High Temperatures. Not Recommended for Low Temperatures.
Useful Temperature Range
32
1385
Grade Temperature Range
32
392
Maximum Thermocouple
Grade Temp.Range

-346
2193
EMF (mV) Over Max.
Temperature Range

-8095
69553
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
IRON Fe (magnetic)

LEAD -
CONSTANTAN COPPER-NICKEL Cu-Ni
Standard Limits of Error**(above O°C)

greater of 2.2°C or 0.75%
Special Limits of Error** (above O°C)

greater of 1.1°C or 0.4%
K Type K Thermocouples
Clean Oxidizing and Inert. Limited Use in Vacuum or Reducing. Wide Temperature Range, Most Popular Calibration
Useful Temperature Range
-328
2282
Grade Temperature Range
32
392
Maximum Thermocouple
Grade Temp.Range

-454
2501
EMF (mV) Over Max.
Temperature Range

-6458
54886
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
CHROMEGA® NICKEL CHROMIUM Ni-Cr

LEAD -
ALOMEGA® NICKEL-ALUMINUM Ni-AI (magnetic)
Standard Limits of Error**(above O°C)

greater of 2.2°C or 0.75%
Special Limits of Error** (above O°C)

greater of 1.1°C or 0.4%
T Type T Thermocouples
Mild Oxidizing, Reducing Vacuum or Inert. Good Where Moisture Is Present. Low Temperature and Cryogenic Applications
Useful Temperature Range
-328
662
Grade Temperature Range
-76
212
Maximum Thermocouple
Grade Temp.Range

-454
752
EMF (mV) Over Max.
Temperature Range

-6258
20872
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
COPPER Cu

LEAD -
CONSTANTAN COPPER-NICKEL Cu–Ni
Standard Limits of Error**(above O°C)

greater of 1°C or 0.75%
Special Limits of Error** (above O°C)

greater of 0.5°C or 0.4%
E Type E Thermocouples
Oxidizing or Inert. Limited Use in Vacuum or Reducing. Highest EMF Change Per Degree
Useful Temperature Range
-328
1652
Grade Temperature Range
32
392
Maximum Thermocouple
Grade Temp.Range

-450
2372
EMF (mV) Over Max.
Temperature Range

-9835
76373
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
CHROMEGA® NICKEL CHROMIUM Ni-Cr

LEAD -
CONSTANTAN COPPER-NICKEL Cu-Ni
Standard Limits of Error**(above O°C)

greater of 1.7°C or 0.5%
Special Limits of Error** (above O°C)

greater of 1°C or 0.4%
N Type N Thermocouples
Alternative to Type K. More Stable at High Temps
Useful Temperature Range
-450
2372
Grade Temperature Range
32
392
Maximum Thermocouple
Grade Temp.Range

-450
2372
EMF (mV) Over Max.
Temperature Range

-4345
47513
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
OMEGA-P® NICROSIL Ni-Cr-Si

LEAD -
OMEGA-N® NISIL Ni-Si-Mg
Standard Limits of Error**(above O°C)

greater of 2.2°C or 0.75%
Special Limits of Error** (above O°C)

greater of 1.1°C or 0.4%
R Type R Thermocouples
Oxidizing or Inert. Do Not Insert in Metal Tubes. Beware of Contamination. High Temperature
Useful Temperature Range
32
2642
Grade Temperature Range
32
300
Maximum Thermocouple
Grade Temp.Range

-58
3214
EMF (mV) Over Max.
Temperature Range

-0.226
21101
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
PLATINUM- 13% RHODIUM Pt-13% Rh

LEAD -
PLATINUM Pt
Standard Limits of Error**(above O°C)

greater of 1.5°C or 0.25%
Special Limits of Error** (above O°C)

greater of 0.6°C or 0.1%
S Type S Thermocouples
Oxidizing or Inert. Do Not Insert in Metal Tubes. Beware of Contamination. High Temperature
Useful Temperature Range
32
2642
Grade Temperature Range
32
300
Maximum Thermocouple
Grade Temp.Range

-58
3214
EMF (mV) Over Max.
Temperature Range

-0.236
18.693
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
PLATINUM- 10% RHODIUM Pt-10% Rh

LEAD -
PLATINUM Pt
Standard Limits of Error**(above O°C)

greater of 1.5°C or 0.25%
Special Limits of Error** (above O°C)

greater of 0.6°C or 0.1%
U Type U Thermocouples
Extension Grade Connecting Wire for R and S Thermocouples, Also Known as RX and SX Extension Wire.
Useful Temperature Range
Grade Temperature Range
32
122
Maximum Thermocouple
Grade Temp.Range

EMF (mV) Over Max.
Temperature Range

Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
COPPER Cu

LEAD -
COPPER-LOW NICKEL Cu-Ni
Standard Limits of Error**(above O°C)


Special Limits of Error** (above O°C)


B Type B Thermocouples
Oxidizing or Inert. Do Not Insert in Metal Tubes. Beware of Contamination. High Temperature. Common Use in Glass Industry
Useful Temperature Range
32
3092
Grade Temperature Range
32
212
Maximum Thermocouple
Grade Temp.Range

32
3308
EMF (mV) Over Max.
Temperature Range

0
13820
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
PLATINUM- 30% RHODIUM Pt-30% Rh

LEAD -
PLATINUM- 6% RHODIUM Pt-6% Rh
Standard Limits of Error**(above O°C)

greater of 0.005°C or 800%
Special Limits of Error** (above O°C)

NOT ESTABLISHED
G Type G Thermocouples
Vacuum, Inert, Hydrogen. Beware of Embrittlement. Not Practical Below 399°C (750°F). Not for Oxidizing Atmosphere
Useful Temperature Range
32
4208
Grade Temperature Range
32
500
Maximum Thermocouple
Grade Temp.Range

32
4208
EMF (mV) Over Max.
Temperature Range

0
38564
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
TUNGSTEN W

LEAD -
TUNGSTEN- 26% RHENIUM W-26% Re
Standard Limits of Error**(above O°C)

greater of 4.5°C or 1%
Special Limits of Error** (above O°C)

NOT ESTABLISHED
C Type C Thermocouples
Vacuum, Inert, Hydrogen. Beware of Embrittlement. Not Practical Below 399°C (750°F). Not for Oxidizing Atmosphere
Useful Temperature Range
32
4208
Grade Temperature Range
32
1600
Maximum Thermocouple
Grade Temp.Range

32
4208
EMF (mV) Over Max.
Temperature Range

0
37066
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
TUNGSTEN- 5% RHENIUM W-5% Re

LEAD -
TUNGSTEN- 26% RHENIUM W-26% Re
Standard Limits of Error**(above O°C)

greater of 4.5°C or 1%
Special Limits of Error** (above O°C)

NOT ESTABLISHED
D Type D Thermocouples
Vacuum, Inert, Hydrogen. Beware of Embrittlement. Not Practical Below 399°C (750°F)–Not for Oxidizing Atmosphere
Useful Temperature Range
32
4208
Grade Temperature Range
32
500
Maximum Thermocouple
Grade Temp.Range

32
4208
EMF (mV) Over Max.
Temperature Range

0
39506
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
TUNGSTEN- 3% RHENIUM W-3% Re

LEAD -
TUNGSTEN- 25% RHENIUM W-25% Re
Standard Limits of Error**(above O°C)

greater of 4.5°C or 1%
Special Limits of Error** (above O°C)

NOT ESTABLISHED
J Type J Thermocouples
Reducing, Vacuum, Inert. Limited Use in Oxidizing at High Temperatures. Not Recommended for Low Temperatures.
Useful Temperature Range
0
750
Grade Temperature Range
0
200
Maximum Thermocouple
Grade Temp.Range

-210
1200
EMF (mV) Over Max.
Temperature Range

-8095
69553
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
IRON Fe (magnetic)

LEAD -
CONSTANTAN COPPER-NICKEL Cu-Ni
Standard Limits of Error**(above O°C)

greater of 2.2°C or 0.75%
Special Limits of Error** (above O°C)

greater of 1.1°C or 0.4%
K Type K Thermocouples
Clean Oxidizing and Inert. Limited Use in Vacuum or Reducing. Wide Temperature Range, Most Popular Calibration
Useful Temperature Range
-200
1250
Grade Temperature Range
0
200
Maximum Thermocouple
Grade Temp.Range

-270
1372
EMF (mV) Over Max.
Temperature Range

-6458
54886
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
CHROMEGA® NICKEL CHROMIUM Ni-Cr

LEAD -
ALOMEGA® NICKEL-ALUMINUM Ni-AI (magnetic)
Standard Limits of Error**(above O°C)

greater of 2.2°C or 0.75%
Special Limits of Error** (above O°C)

greater of 1.1°C or 0.4%
T Type T Thermocouples
Mild Oxidizing, Reducing Vacuum or Inert. Good Where Moisture Is Present. Low Temperature and Cryogenic Applications
Useful Temperature Range
-250
350
Grade Temperature Range
-60
100
Maximum Thermocouple
Grade Temp.Range

-270
400
EMF (mV) Over Max.
Temperature Range

-6258
20872
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
COPPER Cu

LEAD -
CONSTANTAN COPPER-NICKEL Cu–Ni
Standard Limits of Error**(above O°C)

greater of 1°C or 0.75%
Special Limits of Error** (above O°C)

greater of 0.5°C or 0.4%
E Type E Thermocouples
Oxidizing or Inert. Limited Use in Vacuum or Reducing. Highest EMF Change Per Degree
Useful Temperature Range
-200
900
Grade Temperature Range
0
200
Maximum Thermocouple
Grade Temp.Range

-270
1000
EMF (mV) Over Max.
Temperature Range

-9835
76373
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
CHROMEGA® NICKEL CHROMIUM Ni-Cr

LEAD -
CONSTANTAN COPPER-NICKEL Cu-Ni
Standard Limits of Error**(above O°C)

greater of 1.7°C or 0.5%
Special Limits of Error** (above O°C)

greater of 1°C or 0.4%
N Type N Thermocouples
Alternative to Type K. More Stable at High Temps
Useful Temperature Range
-270
1300
Grade Temperature Range
0
200
Maximum Thermocouple
Grade Temp.Range

-270
1300
EMF (mV) Over Max.
Temperature Range

-4345
47513
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
OMEGA-P® NICROSIL Ni-Cr-Si

LEAD -
OMEGA-N® NISIL Ni-Si-Mg
Standard Limits of Error**(above O°C)

greater of 2.2°C or 0.75%
Special Limits of Error** (above O°C)

greater of 1.1°C or 0.4%
R Type R Thermocouples
Oxidizing or Inert. Do Not Insert in Metal Tubes. Beware of Contamination. High Temperature
Useful Temperature Range
0
1450
Grade Temperature Range
-50
1768
Maximum Thermocouple
Grade Temp.Range

-50
1768
EMF (mV) Over Max.
Temperature Range

-0.226
21101
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
PLATINUM- 13% RHODIUM Pt-13% Rh

LEAD -
PLATINUM Pt
Standard Limits of Error**(above O°C)

greater of 1.5°C or 0.25%
Special Limits of Error** (above O°C)

greater of 0.6°C or 0.1%
S Type S Thermocouples
Oxidizing or Inert. Do Not Insert in Metal Tubes. Beware of Contamination. High Temperature
Useful Temperature Range
0
1400
Grade Temperature Range
0
150
Maximum Thermocouple
Grade Temp.Range

-50
1768
EMF (mV) Over Max.
Temperature Range

-0.236
18.693
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
PLATINUM- 10% RHODIUM Pt-10% Rh

LEAD -
PLATINUM Pt
Standard Limits of Error**(above O°C)

greater of 1.5°C or 0.25%
Special Limits of Error** (above O°C)

greater of 0.6°C or 0.1%
U Type U Thermocouples
Extension Grade Connecting Wire for R and S Thermocouples, Also Known as RX and SX Extension Wire.
Useful Temperature Range
Grade Temperature Range
0
50
Maximum Thermocouple
Grade Temp.Range

-50
1768
EMF (mV) Over Max.
Temperature Range

Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
COPPER Cu

LEAD -
COPPER-LOW NICKEL Cu-Ni
Standard Limits of Error**(above O°C)


Special Limits of Error** (above O°C)


B Type B Thermocouples
Oxidizing or Inert. Do Not Insert in Metal Tubes. Beware of Contamination. High Temperature. Common Use in Glass Industry
Useful Temperature Range
0
1700
Grade Temperature Range
0
100
Maximum Thermocouple
Grade Temp.Range

0
1820
EMF (mV) Over Max.
Temperature Range

0
13820
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
PLATINUM- 30% RHODIUM Pt-30% Rh

LEAD -
PLATINUM- 6% RHODIUM Pt-6% Rh
Standard Limits of Error**(above O°C)

greater of 0.005°C or 800%
Special Limits of Error** (above O°C)

NOT ESTABLISHED
G Type G Thermocouples
Vacuum, Inert, Hydrogen. Beware of Embrittlement. Not Practical Below 399°C (750°F). Not for Oxidizing Atmosphere
Useful Temperature Range
0
2320
Grade Temperature Range
0
260
Maximum Thermocouple
Grade Temp.Range

0
2320
EMF (mV) Over Max.
Temperature Range

0
38564
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
TUNGSTEN W

LEAD -
TUNGSTEN- 26% RHENIUM W-26% Re
Standard Limits of Error**(above O°C)

greater of 4.5°C or 1%
Special Limits of Error** (above O°C)

NOT ESTABLISHED
C Type C Thermocouples
Vacuum, Inert, Hydrogen. Beware of Embrittlement. Not Practical Below 399°C (750°F). Not for Oxidizing Atmosphere
Useful Temperature Range
0
2320
Grade Temperature Range
0
870
Maximum Thermocouple
Grade Temp.Range

0
2320
EMF (mV) Over Max.
Temperature Range

0
37066
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
TUNGSTEN- 5% RHENIUM W-5% Re

LEAD -
TUNGSTEN- 26% RHENIUM W-26% Re
Standard Limits of Error**(above O°C)

greater of 4.5°C or 1%
Special Limits of Error** (above O°C)

NOT ESTABLISHED
D Type D Thermocouples
Vacuum, Inert, Hydrogen. Beware of Embrittlement. Not Practical Below 399°C (750°F)–Not for Oxidizing Atmosphere
Useful Temperature Range
0
2320
Grade Temperature Range
0
260
Maximum Thermocouple
Grade Temp.Range

0
2320
EMF (mV) Over Max.
Temperature Range

0
39506
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
TUNGSTEN- 3% RHENIUM W-3% Re

LEAD -
TUNGSTEN- 25% RHENIUM W-25% Re
Standard Limits of Error**(above O°C)

greater of 4.5°C or 1%
Special Limits of Error** (above O°C)

NOT ESTABLISHED
J Type J Thermocouples
Reducing, Vacuum, Inert. Limited Use in Oxidizing at High Temperatures. Not Recommended for Low Temperatures.
Useful Temperature Range
32
1385
Grade Temperature Range
32
392
Maximum Thermocouple
Grade Temp.Range

-346
2193
EMF (mV) Over Max.
Temperature Range

-8095
69553
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
IRON Fe (magnetic)

LEAD -
CONSTANTAN COPPER-NICKEL Cu-Ni
Standard Limits of Error**(above O°C)

greater of 2.2°C or 0.75%
Special Limits of Error** (above O°C)

greater of 1.1°C or 0.4%
K Type K Thermocouples
Clean Oxidizing and Inert. Limited Use in Vacuum or Reducing. Wide Temperature Range, Most Popular Calibration
Useful Temperature Range
-328
2282
Grade Temperature Range
32
392
Maximum Thermocouple
Grade Temp.Range

-454
2501
EMF (mV) Over Max.
Temperature Range

-6458
54886
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
CHROMEGA® NICKEL CHROMIUM Ni-Cr

LEAD -
ALOMEGA® NICKEL-ALUMINUM Ni-AI (magnetic)
Standard Limits of Error**(above O°C)

greater of 2.2°C or 0.75%
Special Limits of Error** (above O°C)

greater of 1.1°C or 0.4%
T Type T Thermocouples
Mild Oxidizing, Reducing Vacuum or Inert. Good Where Moisture Is Present. Low Temperature and Cryogenic Applications
Useful Temperature Range
-328
662
Grade Temperature Range
-76
212
Maximum Thermocouple
Grade Temp.Range

-454
752
EMF (mV) Over Max.
Temperature Range

-6258
20872
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
COPPER Cu

LEAD -
CONSTANTAN COPPER-NICKEL Cu–Ni
Standard Limits of Error**(above O°C)

greater of 1°C or 0.75%
Special Limits of Error** (above O°C)

greater of 0.5°C or 0.4%
E Type E Thermocouples
Oxidizing or Inert. Limited Use in Vacuum or Reducing. Highest EMF Change Per Degree
Useful Temperature Range
-328
1652
Grade Temperature Range
32
392
Maximum Thermocouple
Grade Temp.Range

-450
2372
EMF (mV) Over Max.
Temperature Range

-9835
76373
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
CHROMEGA® NICKEL CHROMIUM Ni-Cr

LEAD -
CONSTANTAN COPPER-NICKEL Cu-Ni
Standard Limits of Error**(above O°C)

greater of 1.7°C or 0.5%
Special Limits of Error** (above O°C)

greater of 1°C or 0.4%
N Type N Thermocouples
Alternative to Type K. More Stable at High Temps
Useful Temperature Range
-450
2372
Grade Temperature Range
32
392
Maximum Thermocouple
Grade Temp.Range

-450
2372
EMF (mV) Over Max.
Temperature Range

-4345
47513
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
OMEGA-P® NICROSIL Ni-Cr-Si

LEAD -
OMEGA-N® NISIL Ni-Si-Mg
Standard Limits of Error**(above O°C)

greater of 2.2°C or 0.75%
Special Limits of Error** (above O°C)

greater of 1.1°C or 0.4%
R Type R Thermocouples
Oxidizing or Inert. Do Not Insert in Metal Tubes. Beware of Contamination. High Temperature
Useful Temperature Range
32
2642
Grade Temperature Range
32
300
Maximum Thermocouple
Grade Temp.Range

-58
3214
EMF (mV) Over Max.
Temperature Range

-0.226
21101
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
PLATINUM- 13% RHODIUM Pt-13% Rh

LEAD -
PLATINUM Pt
Standard Limits of Error**(above O°C)

greater of 1.5°C or 0.25%
Special Limits of Error** (above O°C)

greater of 0.6°C or 0.1%
S Type S Thermocouples
Oxidizing or Inert. Do Not Insert in Metal Tubes. Beware of Contamination. High Temperature
Useful Temperature Range
32
2642
Grade Temperature Range
32
300
Maximum Thermocouple
Grade Temp.Range

-58
3214
EMF (mV) Over Max.
Temperature Range

-0.236
18.693
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
PLATINUM- 10% RHODIUM Pt-10% Rh

LEAD -
PLATINUM Pt
Standard Limits of Error**(above O°C)

greater of 1.5°C or 0.25%
Special Limits of Error** (above O°C)

greater of 0.6°C or 0.1%
U Type U Thermocouples
Extension Grade Connecting Wire for R and S Thermocouples, Also Known as RX and SX Extension Wire.
Useful Temperature Range
Grade Temperature Range
32
122
Maximum Thermocouple
Grade Temp.Range

EMF (mV) Over Max.
Temperature Range

Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
COPPER Cu

LEAD -
COPPER-LOW NICKEL Cu-Ni
Standard Limits of Error**(above O°C)


Special Limits of Error** (above O°C)


B Type B Thermocouples
Oxidizing or Inert. Do Not Insert in Metal Tubes. Beware of Contamination. High Temperature. Common Use in Glass Industry
Useful Temperature Range
32
3092
Grade Temperature Range
32
212
Maximum Thermocouple
Grade Temp.Range

32
3308
EMF (mV) Over Max.
Temperature Range

0
13820
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
PLATINUM- 30% RHODIUM Pt-30% Rh

LEAD -
PLATINUM- 6% RHODIUM Pt-6% Rh
Standard Limits of Error**(above O°C)

greater of 0.005°C or 800%
Special Limits of Error** (above O°C)

NOT ESTABLISHED
G Type G Thermocouples
Vacuum, Inert, Hydrogen. Beware of Embrittlement. Not Practical Below 399°C (750°F). Not for Oxidizing Atmosphere
Useful Temperature Range
32
4208
Grade Temperature Range
32
500
Maximum Thermocouple
Grade Temp.Range

32
4208
EMF (mV) Over Max.
Temperature Range

0
38564
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
TUNGSTEN W

LEAD -
TUNGSTEN- 26% RHENIUM W-26% Re
Standard Limits of Error**(above O°C)

greater of 4.5°C or 1%
Special Limits of Error** (above O°C)

NOT ESTABLISHED
C Type C Thermocouples
Vacuum, Inert, Hydrogen. Beware of Embrittlement. Not Practical Below 399°C (750°F). Not for Oxidizing Atmosphere
Useful Temperature Range
32
4208
Grade Temperature Range
32
1600
Maximum Thermocouple
Grade Temp.Range

32
4208
EMF (mV) Over Max.
Temperature Range

0
37066
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
TUNGSTEN- 5% RHENIUM W-5% Re

LEAD -
TUNGSTEN- 26% RHENIUM W-26% Re
Standard Limits of Error**(above O°C)

greater of 4.5°C or 1%
Special Limits of Error** (above O°C)

NOT ESTABLISHED
D Type D Thermocouples
Vacuum, Inert, Hydrogen. Beware of Embrittlement. Not Practical Below 399°C (750°F)–Not for Oxidizing Atmosphere
Useful Temperature Range
32
4208
Grade Temperature Range
32
500
Maximum Thermocouple
Grade Temp.Range

32
4208
EMF (mV) Over Max.
Temperature Range

0
39506
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
TUNGSTEN- 3% RHENIUM W-3% Re

LEAD -
TUNGSTEN- 25% RHENIUM W-25% Re
Standard Limits of Error**(above O°C)

greater of 4.5°C or 1%
Special Limits of Error** (above O°C)

NOT ESTABLISHED
J Type J Thermocouples
Reducing, Vacuum, Inert. Limited Use in Oxidizing at High Temperatures. Not Recommended for Low Temperatures.
Useful Temperature Range
0
750
Grade Temperature Range
0
200
Maximum Thermocouple
Grade Temp.Range

-210
1200
EMF (mV) Over Max.
Temperature Range

-8095
69553
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
IRON Fe (magnetic)

LEAD -
CONSTANTAN COPPER-NICKEL Cu-Ni
Standard Limits of Error**(above O°C)

greater of 2.2°C or 0.75%
Special Limits of Error** (above O°C)

greater of 1.1°C or 0.4%
K Type K Thermocouples
Clean Oxidizing and Inert. Limited Use in Vacuum or Reducing. Wide Temperature Range, Most Popular Calibration
Useful Temperature Range
-200
1250
Grade Temperature Range
0
200
Maximum Thermocouple
Grade Temp.Range

-270
1372
EMF (mV) Over Max.
Temperature Range

-6458
54886
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
CHROMEGA® NICKEL CHROMIUM Ni-Cr

LEAD -
ALOMEGA® NICKEL-ALUMINUM Ni-AI (magnetic)
Standard Limits of Error**(above O°C)

greater of 2.2°C or 0.75%
Special Limits of Error** (above O°C)

greater of 1.1°C or 0.4%
T Type T Thermocouples
Mild Oxidizing, Reducing Vacuum or Inert. Good Where Moisture Is Present. Low Temperature and Cryogenic Applications
Useful Temperature Range
-250
350
Grade Temperature Range
-60
100
Maximum Thermocouple
Grade Temp.Range

-270
400
EMF (mV) Over Max.
Temperature Range

-6258
20872
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
COPPER Cu

LEAD -
CONSTANTAN COPPER-NICKEL Cu–Ni
Standard Limits of Error**(above O°C)

greater of 1°C or 0.75%
Special Limits of Error** (above O°C)

greater of 0.5°C or 0.4%
E Type E Thermocouples
Oxidizing or Inert. Limited Use in Vacuum or Reducing. Highest EMF Change Per Degree
Useful Temperature Range
-200
900
Grade Temperature Range
0
200
Maximum Thermocouple
Grade Temp.Range

-270
1000
EMF (mV) Over Max.
Temperature Range

-9835
76373
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
CHROMEGA® NICKEL CHROMIUM Ni-Cr

LEAD -
CONSTANTAN COPPER-NICKEL Cu-Ni
Standard Limits of Error**(above O°C)

greater of 1.7°C or 0.5%
Special Limits of Error** (above O°C)

greater of 1°C or 0.4%
N Type N Thermocouples
Alternative to Type K. More Stable at High Temps
Useful Temperature Range
-270
1300
Grade Temperature Range
0
200
Maximum Thermocouple
Grade Temp.Range

-270
1300
EMF (mV) Over Max.
Temperature Range

-4345
47513
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
OMEGA-P® NICROSIL Ni-Cr-Si

LEAD -
OMEGA-N® NISIL Ni-Si-Mg
Standard Limits of Error**(above O°C)

greater of 2.2°C or 0.75%
Special Limits of Error** (above O°C)

greater of 1.1°C or 0.4%
R Type R Thermocouples
Oxidizing or Inert. Do Not Insert in Metal Tubes. Beware of Contamination. High Temperature
Useful Temperature Range
0
1450
Grade Temperature Range
-50
1768
Maximum Thermocouple
Grade Temp.Range

-50
1768
EMF (mV) Over Max.
Temperature Range

-0.226
21101
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
PLATINUM- 13% RHODIUM Pt-13% Rh

LEAD -
PLATINUM Pt
Standard Limits of Error**(above O°C)

greater of 1.5°C or 0.25%
Special Limits of Error** (above O°C)

greater of 0.6°C or 0.1%
S Type S Thermocouples
Oxidizing or Inert. Do Not Insert in Metal Tubes. Beware of Contamination. High Temperature
Useful Temperature Range
0
1400
Grade Temperature Range
0
150
Maximum Thermocouple
Grade Temp.Range

-50
1768
EMF (mV) Over Max.
Temperature Range

-0.236
18.693
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
PLATINUM- 10% RHODIUM Pt-10% Rh

LEAD -
PLATINUM Pt
Standard Limits of Error**(above O°C)

greater of 1.5°C or 0.25%
Special Limits of Error** (above O°C)

greater of 0.6°C or 0.1%
U Type U Thermocouples
Extension Grade Connecting Wire for R and S Thermocouples, Also Known as RX and SX Extension Wire.
Useful Temperature Range
Grade Temperature Range
0
50
Maximum Thermocouple
Grade Temp.Range

-50
1768
EMF (mV) Over Max.
Temperature Range

Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
COPPER Cu

LEAD -
COPPER-LOW NICKEL Cu-Ni
Standard Limits of Error**(above O°C)


Special Limits of Error** (above O°C)


B Type B Thermocouples
Oxidizing or Inert. Do Not Insert in Metal Tubes. Beware of Contamination. High Temperature. Common Use in Glass Industry
Useful Temperature Range
0
1700
Grade Temperature Range
0
100
Maximum Thermocouple
Grade Temp.Range

0
1820
EMF (mV) Over Max.
Temperature Range

0
13820
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
PLATINUM- 30% RHODIUM Pt-30% Rh

LEAD -
PLATINUM- 6% RHODIUM Pt-6% Rh
Standard Limits of Error**(above O°C)

greater of 0.005°C or 800%
Special Limits of Error** (above O°C)

NOT ESTABLISHED
G Type G Thermocouples
Vacuum, Inert, Hydrogen. Beware of Embrittlement. Not Practical Below 399°C (750°F). Not for Oxidizing Atmosphere
Useful Temperature Range
0
2320
Grade Temperature Range
0
260
Maximum Thermocouple
Grade Temp.Range

0
2320
EMF (mV) Over Max.
Temperature Range

0
38564
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
TUNGSTEN W

LEAD -
TUNGSTEN- 26% RHENIUM W-26% Re
Standard Limits of Error**(above O°C)

greater of 4.5°C or 1%
Special Limits of Error** (above O°C)

NOT ESTABLISHED
C Type C Thermocouples
Vacuum, Inert, Hydrogen. Beware of Embrittlement. Not Practical Below 399°C (750°F). Not for Oxidizing Atmosphere
Useful Temperature Range
0
2320
Grade Temperature Range
0
870
Maximum Thermocouple
Grade Temp.Range

0
2320
EMF (mV) Over Max.
Temperature Range

0
37066
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
TUNGSTEN- 5% RHENIUM W-5% Re

LEAD -
TUNGSTEN- 26% RHENIUM W-26% Re
Standard Limits of Error**(above O°C)

greater of 4.5°C or 1%
Special Limits of Error** (above O°C)

NOT ESTABLISHED
D Type D Thermocouples
Vacuum, Inert, Hydrogen. Beware of Embrittlement. Not Practical Below 399°C (750°F)–Not for Oxidizing Atmosphere
Useful Temperature Range
0
2320
Grade Temperature Range
0
260
Maximum Thermocouple
Grade Temp.Range

0
2320
EMF (mV) Over Max.
Temperature Range

0
39506
Color Coding

Thermocouple | Extension
Alloy Combinations

LEAD +
TUNGSTEN- 3% RHENIUM W-3% Re

LEAD -
TUNGSTEN- 25% RHENIUM W-25% Re
Standard Limits of Error**(above O°C)

greater of 4.5°C or 1%
Special Limits of Error** (above O°C)

NOT ESTABLISHED
⚠ Thermocouple Type Not Found
No thermocouple types match the specified temperature range. Try one of the options below and find the correct temperature measurement equipment for you application.
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Note: This tool does not consider all factors needed for choosing a thermocouple. Applications, materials being measured, wire insulation and conditions need to be considered to ensure safety and performance.

++ 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.