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Wire Color Codes and Limits of Error

View the printable version (Printable version also contains international color codes)
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- LeadThermocouple
Grade		Extension
Grade
JIRON
Fe
(magnetic)		CONSTANTAN
COPPER-NICKEL
Cu-Ni		Thermocouple Color CodesThermocouple 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
KCHROMEGA®
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
TCOPPER
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
ECHROMEGA®
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
NOMEGA-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
RPLATINUM-
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
SPLATINUM-
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
UCOPPER
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
BPLATINUM-
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 13.8200.5% over 800°CNOT
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 38.564greater 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 37.066greater 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 39.506greater 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)

++ 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 DwyerOmega's sales Department for a CAL-4 calibration report.

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