Project Description

Nicrosil-Nisil thermocouple (Type N)

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.

TypeChemical Composition, %
NiCrMnSiMg
NPRest13.7-14.7/1.2-1.6≤0.01
NNRest0.02/4.2-4.60.5-1.5

* Standard: IEC60584-1

TYPEEMF Versus Pt.67(mV)
100℃200℃400℃600℃800℃1000℃
NP1.755~1.8133.910~3.9768.880~8.95914.307~14.43320.012~20.18032.313~32.525
NN0.975~1.0051.954~1.9884.035~4.0756.212~6.2748.318~8.4028.807~8.907
NP-NN2.730~2.8185.864~5.96212.915~13.03320.519~20.70728.330~28.5828.807~8.907

* Physical Properties:

TypeDensity 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)
NP8.51410≥620≥250.97
NN8.61340≥550≥300.33