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
