The Bottom Line: Which Should You Choose? Choose Monel when your environment involves seawater, hydrofluoric acid, or highly reducing conditions. Choose stainless steel when oxid...
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NiCrSi-NiSiMgthermocouple is the latest base metal thermocouple, developed to improve the drawbacks that the 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 can also be used in 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 thermocouples as it hasa long life and stable thermal EMF.
| Type | Chemical composition (%) | |||||
| Ni | Cr | Mn | Si | Mg | ||
| NP (NicrSi, Positive) | Bal | 13.7–14.7 | / | 1.2–1.6 | 0.01 | |
| NN (NiSiMg, Negative) | Bal | 0.02 | / | 4.2–4.6 | 0.5–1.5 | |
| Standard: IEC60584-1 | ||||||
| Type | EMFVersus 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 | 41.12–41.432 |
| Physical property | ||||||
| Type | Density at 20℃ (g/cm³) | Melting point (℃) | Tensile Strength (Mpsa, Soft annealed condition in 20℃) | 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 | |
The Bottom Line: Which Should You Choose? Choose Monel when your environment involves seawater, hydrofluoric acid, or highly reducing conditions. Choose stainless steel when oxid...
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