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, %
| Type | Ni | Cr | Si | Mg |
| NP | Bal | 13.7-14.7 | 1.2-1.6 | <0.01 |
| NN | Bal | <0.02 | 4.2-4.6 | 0.5-1.5 |
Specification (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 |
Physical and Mechanical Properties (RT, Annealed)
| Type | Density, g/cm³ | Melting Point, ℃ | Tensile Strength, MPa | Elongation, % | Resistivity, μΩ.m |
| NP | 8.5 | 1410 | ≥620 | ≥25 | 0.97 |
| NN | 8.6 | 1340 | ≥550 | ≥30 | 0.33 |
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.
