Type L Thermocouple Wire

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Reliable in oxidizing, inert, and dry reducing atmospheres, Ni-Cr vs. Cu-Ni thermocouple wires ensures stable temperature measurement and can endure short-term vacuum exposure. To maintain performance, it should be shielded from sulfur-containing and highly oxidizing environments. Among standardized thermocouples, it delivers the highest electromotive force (EMF) per degree, making it ideal for precise thermal sensing applications.

Chemical properties (%)

Material	Chemical composition (%)
Material	Ni	Cr	Cu	Mn	Al
LP(Chromel)	90	10
LN(Copel)	44		Bal	0.5-1

Physical and mechanical properties

Material	Density(g/cm3)	Melting point℃)	Tensile strength(Mpa)	Volume resistivity (μΩNaN)	Elongation rate (%)
LP(Chromel)	8.5	1427	>490	70.6(20℃)	>25
LN(Copel)	8.8	1220	>390	49.0(20℃)	>25

EMF Value range at different temperatures

Material	EMF value vs. Platinum (μV)
	100℃	200℃	300℃	400℃	500℃	600℃	700℃	800℃	1000℃	1100℃
LP(Chromel)	6.750~6.970	14.436~14.678	22.711~22.967	31.348~31.628	40.116~40.468	48.887~49.309	57.612~58.100	66.200~66.738	-	-
LN(Copel)