Fe-CuNi thermocouple (Type J)

Fe-CuNi thermocouple (type J) is also named Fe- Constantan thermocouple. The positive leg Fe(JP) is made by pure Iron, and the main chemical composition of negative leg Constantan (JN) is Cu: Ni≈ 55%: 45%. Although they are all called Constantan, JN does not give the same EMF output curve as EN and TN, it cannot be instead by other Constantan.

Category:

Thermocouple Wire

Key word:

Thermocouple Wire

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Product Details

The operating temperature range of type J thermocouple is -210~1200℃, but it is usually used in the temperature range 0~750℃ due to embrittlement of Iron.

Type J thermocouple has good resistance to oxidation and high EMF output against Platinum 67, with good temperature accuracy, sensitivity and stability. It is recommended for vacuum, oxidizing, reducing or inert atmospheres, but it can not be used in sulphurous atmosphere above 500℃.

TYPE	Chemical Composition%
TYPE	Ni	Cu	Mn	Si	Fe
JP	/	/	/	/	100
JN	45	55	/	/	/

Standard：IEC60584-1

TYPE	EMF Versus Pt.67(mV)
TYPE	100℃	200℃	300℃	400℃	600℃
JP-JN	5.207-5.331	10.717-10.841	16.244-16.410	21.760-21.936	32.956~33.236

Physical Properties:

Type	Density at 20℃ （g/cm³）	Melting point （℃）	Tensile Strength(Soft annealed condition in 20℃)（Mpa）	Elongation(Soft annealed condition in 20℃)（%）	Resistivity at 20℃ (μΩ.m)
JP	7.8	1402	≥240	≥20	0.12
JN	8.8	1220	≥390	≥25	0.49