"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: Nia 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 J. The operating temperature range of type E thermocouple is-200~900 C. 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 C, 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 AND MAIN CHEMICAL COMPOSITION(%) Type CHEMICAL COMPOSITION Ni Cr Cu Si Al NiCr EP 90 10 / / CuNi 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.