International Thermocouple Colour Codes —
Thermocouple and Extension Grade Wires

ANSI Code	Alloy Combination		Colour Coding		Maximum Temperature Useful Range	EMF (mV) Over Max. Temperature Range	Limits of Error** (Whichever is Greater)
	+Lead	-Lead	Thermocouple Grade	Extension Grade
							Standard	Special
U*	COPPER Cu	COPPER-LOW NICKEL Cu-Ni	NONE ESTABLISHED		0 to 50°C (32 to 122°F) Ext. Grade
B	PLATINUM 30% RHODIUM Pt-30% Rh	PLATINUM 6% RHODIUM Pt-6% Rh	NONE ESTABLISHED		0 to 1700°C (32 to 3092°F) Therm. Grade 0 to 100°C (32 to 212°F) Ext. Grade	0 to 13.820	0 to 1700°C (32 to 3092°F)   0.5% over 800°C Not Established
G* (W)	TUNGSTEN W	TUNGSTEN- 26% RHENIUM W-26% Re	NONE ESTABLISHED		0 to 2320°C (32 to 4208°F) Therm. Grade 0 to 260°C (32 to 500°F) Ext. Grade	0 to 38.564	4.5°C to 425°C 1.0% to 2320°C	Not Established
C* (W5)	TUNGSTEN- 5% RHENIUM W-5% Re	TUNGSTEN- 26% RHENIUM W-26% Re	NONE ESTABLISHED		0 to 2320°C (32 to 4208°F) Therm. Grade 0 to 870°C (32 to 1600°F) Ext. Grade	0 to 37.066	4.5°C to 425°C 1.0% to 2320°C	Not Established
D* (W3)	TUNGSTEN- 3% RHENIUM W-3% Re	TUNGSTEN- 25% RHENIUM W-25% Re	NONE ESTABLISHED		0 to 2320°C (32 to 4208°F) Therm. Grade 0 to 260°C (32 to 500°F) Ext. Grade	0 to 39.506	4.5°C to 425°C 1.0% to 2320°C	Not Established

*Not Official Symbol or Standard   ‡Extension Grade   **ASTM Standard E230-87, 1992 Annual Book of ASTM Standards

ANSI CODE	International IEC 584-3	International IEC 584-3 Intrinsically Safe	CZECH BRITISH to BS 1843	NETHERLANDS GERMAN to DIN 43710	JAPANESE to JIS C 1610-1981	FRENCH to NFC 42-324	Comments Environment - Bare Wire
U*							Extension Grade Connecting Wire for R & S Thermocouples; Also Known as RX and SX Extension Wire
B			No Standard Use Copper Wire			No Standard Use Copper Wire	Oxidising or Inert. Do Not Insert in Metal Tubes. Beware of Contamination. High Temperature. Common Use in Glass Industry
G* (W)				No Standard Use American Colour Codes			Vacuum, Inert, Hydrogen. Beware of Embrittlement. Not Practical Below 399°C (750°F). Not for Oxidising Atmosphere
C* (W5)				No Standard Use American Colour Codes			Vacuum, Inert, Hydrogen. Beware of Embrittlement. Not Practical Below 399°C (750°F). Not for Oxidising Atmosphere
D* (W3)				No Standard Use American Colour Codes			Vacuum, Inert, Hydrogen. Beware of Embrittlement. Not Practical Below 399°C (750°F). Not for Oxidising Atmosphere

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