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NiCr- CuNi(Constantan) thermocouple (Type E)

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NiCr- CuNi thermocouple (type E) is also named NiCr- Constantan thermocouple. The main chemical composition of positive leg NiCr (EP) is Ni: Cr≈90:10; negative leg Constantan (EN) is Cu: Ni≈ 55%: 45%. Although EN, TN, JN are all called Constantan, EN and TN don not give the same EMF output curve as JN. EN and TN are able to interchange but they are not interchangeable with JN. The operating temperature range of type E thermocouple is -200~900℃。

Type E thermocouple has the largest EMF output and highest sensitivity, so it is ideal for measuring small temperature change. It also has good stability in the low temperature range up to 300℃, and good property of anti-corrosion in humidity atmosphere. It is recommended for oxidizing or inert atmospheres, but cannot be used directly in reducing atmosphere and atmosphere with sulphur gases.

 

TYPE

Chemical Composition%
Ni Cr Cu Si Al
EP 90 10 / / /
EN 45 /

55

/ /

Standard:IEC60584-1

TYPE EMF Versus Pt.67(mV)
100℃ 200℃ 400℃ 600℃ 800℃  
EP 2.784~2.844 5.938~6.002 12.709~12.819 19.537~19.699 26.102~26.308  
EN 3.467~3.543 7.410~7.492 16.109~16.255 25.362~25.588 34.664~34.960  
Ep-EN 6.251~6.387 13.348~13.494 28.818~29.074 44.899~45.287 60.766~61.268  

PhysicalProperties:

Type Density 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)
EP 8.5 1427 ≥490 ≥10 0.71
EN 8.5 1220 ≥390 ≥25 0.50

 

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