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Nicrosil-Nisil thermocouple (Type N)

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Nicrosil-Nisil thermocouple is the latest base metal thermocouple, developed to improve the drawbacks that type K thermocouple has. The main chemical composition of positive leg Nicrosil(NP) is Ni: Cr: Si≈84.4: 14.2: 1.4; negative leg Nisil (NN) is Ni: Si: Mg≈95.5: 4.4: 0.1. Type N thermocouple also be used in the similar atmospheres that type K works, and the operating temperature range is -200~1300℃。

Type N thermocouple improves the EMF drift and short term EMF change, compared to type K thermocouple, and has a longer life than type K thermocouple. Therefore, in the industries where temperature control and measurement are especially critical, type N thermocouple has more advantages than other thermocouple as it has long life and stable thermal EMF.

 

TYPE Chemical Composition%
Ni Cr Mn Si Mg
NP rest 13.7~14.7 / 1.2~1.6 0.01
NN rest 0.02  / 4.2~4.6 0.5~1.5

Standard: IEC60584-1

TYPE EMF Versus Pt.67(mv)
100℃ 200℃ 400℃ 600℃ 800℃ 1000℃
NP 1.755~1.813 3.910~3.976 8.880~8.959 14.307~14.433 20.012~20.180 32.313~32.525
NN 0.975~1.005 1.954~1.988 4.035~4.075 6.212~6.274 8.318~8.402 8.807~8.907
NP-NN 2.730~2.818 5.864~5.962 12.915~13.033 20.519~20.707 28.330~28.582 8.807~8.907

PhysicalProperties:

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)
NP 8.5 1410 ≥620 ≥25 0.97
NN 8.6 1340 ≥550 ≥30 0.33

 

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