NiCrSi-NiSiMg 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
Products
NiCrSi- NiSiMg thermocouple wire(Type-N)
DETAIL
NiCrSi-NiSiMg 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 AND MAIN CHEMICAL COMPOSITION(%)
Type | Chemical composition(%) | |||||
Ni | Cr | Mn | Si | Mg | ||
NiCrSi NP | 余量 | 13.7~14.7 | / | 1.2~1.6 | 0.01 | |
NiSiMg NN | 余量 | 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℃ | |
NiCrSi 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 |
NiSiMg 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 |
Type | Desity at 20℃ | Melting point | Tensile Strength(Soft annealed condition in 20℃) | Elongation(Soft annealed condition in 20℃) | Resistivity at 20℃ | |
NiCrSi NP | 8.5 | 1410 | ≥620 | ≥25 | 0.97 | |
NiSiMg NN | 8.6 | 1340 | ≥550 | ≥30 | 0.33 | |