Type L Thermocouple Wire

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 (%)
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)
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