Type N (Nicrosil/Nisil)

Type N thermocouple alloys were developed to avoid some of the issues that Type K has in low Oxygen environments. It has the same range and applications as type K.

Chemical Composition, %

TypeNiCrSiMg
NPBal13.7-14.71.2-1.6<0.01
NNBal<0.024.2-4.60.5-1.5

Specification (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 and Mechanical Properties (RT, Annealed)

TypeDensity, g/cm³Melting Point, ℃Tensile Strength, MPaElongation, %Resistivity, μΩ.m
NP8.51410≥620≥250.97
NN8.61340≥550≥300.33

Features

  • Type N Thermocouple improves the EMF drift and short term EMF change compared with Type K
  • Longer life than Type K Thermocouple
  • Stable thermal EMF

Applications

Type N Thermocouples are used in the industries where temperature control and measurement are especially critical.