Thermocouple Alloy Wire

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Introduction
Thermocouple alloy is a material that uses the feature of thermoelectrical potential changing with temperature difference to measure temperature.

Performance demands on metal thermocouple are as following

This alloy should has high thermoelectrical potential and temperature coefficient of thermoelectrical potential to ensure high sensitivity. And it is required that the variation of thermoelectrical potential with temperature is single-valued, preferably in a linear relationship.
Good oxidation resistance at high temperature and corrosion resistance to environmental medium are needed.
Good stability and repeatability during the use, being easy to process and low cost are also required.

It is difficult for alloy to meet these requirements, and the thermocouple materials also have their own advantages and disadvantages. So thermocouple material is selected by operating temperature.

Specifications
Conventional alloy made thermocouple wire has a size of 0.2mm, 0.5mm, 0.8mm, 1.2mm, 1.5mm, 2.0mm or 3.2mm. And we can customize the size based on customers' requirements, ranging from 0.05mm to 10mm.
The precious metal made thermocouple wire has a finest size of 0.03mm.

OHMALLOY produced thermocouple alloys include the following products

Variety	Index	Cathode material		Anode material		Max. operating temperature/℃		Temperature range of reference table/℃	Standard No.
Variety	Index	Code name	Component	Code name	Component	Long term	Short term	Temperature range of reference table/℃	Standard No.
PtRh30-PtRh6	B	BP	PtRh30	BN	PtRh6	1600	1800	0~1820	GB 290*2-82
PtRh13-Pt	R	RP	PtRh13	RN	Pt	1400	1600	-50~1769	GB 1598-86
PtRh10-Pt	S	SP	PtRh10	SN	Pt	1300	1600	-50~1769	GB 3772-83
NiCr-NiSi	K	KP	NiCr10	KN	NiSi3	1200	1300	-270~1373	GB 2614-85
NiCr-Constantane	E	EP	NiCr10	EN	NiCu55	750	900	-270~1000	GB 4993-85
Fe-constantane	J	JP	Fe	JN	NiCu55	600	750	-210~1200	GB 4993-85
Cu-constantane	T	TP	Cu	TN	NiCu55	350	400	-270~400	GB 2903-82
NiCr-gold-iron	NiCr-AuFe	NiCr	NiCr10	AuFe	AuFe0.07 (mole fraction, %)	0	-	-273.15~0	GB 2904-82
Copper - gold-rion	Cr-AufF	Cr	Cu	AuFe	AuFe0.07 (mole fraction, %)	0	-	-270~0	GB 2904-82
NiCrSi - NiSi	N	NP	NiCr14.5Si1.5	NN	NiSi4.5MgO0.1	1200	1300	-270~1300	ZBN05004-88
Tungsten rhenium 3-Tungsten rhenium 25	WRe3-WRe25	WRe3	WRe3	WRe25	WRe25	2300	-	-0~2315	ZBN05003-88
Tungsten rhenium 5-Tungsten rhenium 26	wRe5-WRe26	WRe5	WRe5	WRe26	WRe26	2300	-	-0~2315	ZBN05003-88

Index
alloy wire, metal alloy