Type N Thermocouple Wire

This type of thermocouple wire is used for manufacturing N-type thermocouples, which are temperature sensors designed to measure high temperatures. It consists of two different metal alloy wires that provide excellent stability and strong oxidation resistance, making it well-suited for high-temperature and oxidizing environments.

The N-type thermocouple is composed of:

  • NP (positive leg): Made from a nickel-chromium-silicon (Ni-Cr-Si) alloy, offering strong resistance to oxidation.
  • NN (negative leg): Made from a nickel-silicon-magnesium (Ni-Si-Mg) alloy, ensuring stable performance over extended use.
Chemical composition (%)
Material Chemical composition (%)
Ni Cr Si Mg Al
NP(NiCrSi) bal 13.7-14.7 1.2-1.6 < 0.01  
NN(NiCrMg) bal < 0.02 4.2-4.6 0.5~1.5  
Physical and mechanical properties
Material Density (g/cm3) Melting point℃ Tensile strength (Mpa) Volume resistivity (μΩNaN) Elongation rate (%)
NP (NiCrSi) 8.5 1410 >620 100.0 (20℃) >30
NN (NiCrMg) 8.6 1340 >550 33.0(20℃) >35
EMF value range at different temperatures
Material EMF value Vs Pt(μV)
100℃ 200℃ 300℃ 400℃ 500℃ 600℃
NP (NiCrSi) 1755~ 1813 3910~ 3976 6313~ 6383 8880~ 8959 11552~ 11654 14307~ 14433
NN (NiCrMg) 975~ 1005 1954~ 1986 2975~ 3011 4035~ 4075 5120~ 5170 6212~ 6274
EMF value Vs Pt(μV)
700℃ 800℃ 900℃ 1000℃ 1100℃
17129~17275 20010~20178 22951~23139 25943~26149 28972~29194
7288~7362 8318~8402 9281~9373 10159~10261 10948~11060
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