Thermocouple Wire Color Reference Chart Type K, J and N USA and International IEC 584-3
Thermocouple Lead Wire Color Reference Chart Type K, J and N for USA and International IEC 584-3. Click on the title to go to the chart.
ANSI
Code
J
K
N
Alloy
Combination
+ Lead
IRON
Fe
(magnetic)
NICKEL-CHROMIUM
Ni-Cr
NICROSIL
Ni-Cr-Si
- Lead
CONSTANTAN
COPPER-NICKEL
Cu-Ni
NICKEL-ALUMINUM
Ni-AI
(magnetic)
NISIL
Ni-Si-Mg
Color Coding
USA & Canada
Thermocouple Grade
Extension Grade
Maximum Useful
Temperature
Range ++
Thermocouple Grade
32 to 1382°F
0 to 750°C
–328 to 2282°F
–200 to 1250°C
–450 to 2372°F
–270 to 1300°C
Extension Grade
32 to 392°F
0 to 200°C
32 to 392°F
0 to 200°C
32 to 392°F
0 to 200°C
Maximum Thermocouple Grade
Temperature Range
–346 to 2193°F
–210 to 1200°C
–454 to 2501°F
–270 to 1372°C
–450 to 2372°F
–270 to 1300°C
EMF (mV) Over Max.
Temperature Range
–8.095 to
69.553
–6.458 to
54.886
–4.345
to 47.513
Standard Limits of Error**
(above O°C)
greater of
2.2°C or 0.75%
greater of
2.2°C or 0.75%
greater of
2.2°C or 0.75%
Special Limits of Error**
(above O°C)
greater of
1.1°C or 0.4%
greater of
1.1°C or 0.4%
greater of
1.1°C or 0.4%
International IEC 584-3
Comments Environment — Bare Wire
Reducing, Vacuum, Inert.
Limited Use in Oxidizing
at High Temperatures.
Not Recommended for
Low Temperatures.
Clean Oxidizing and Inert.
Limited Use in Vacuum or
Reducing. Wide Temperature
Range, Most Popular Calibration
Alternative to Type K.
More Stable
at High Temps
++ 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 sales department
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