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NiCr-NiSi thermocouple wire (Type K)

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NiCr-NiSi (Type K) thermocouple finds the widest use in all basemetal thermocouple, at temperature above 500℃。The main chemical composition of positive leg NiCr (KP) are Ni≈90% and Cr≈10%; negative leg NiSi (KN) are Ni≈97% and Cr≈3%. The operating temperature range is - 200~1300℃(for short term) and 0~1100℃( for long term)。

Type K thermocouple has strong resistance to oxidation than other base metal thermocouples. It has high EMF against Platinum 67, excellent temperature accuracy, sensitivity and stability, with a low cost. It is recommended for oxidizing or inert atmospheres, but cannot be used directly in the following cases:

(1) Alternatively oxidizing and reducing atmosphere,

(2) Atmosphere with sulphur gases

(3) Long time in vacuum

(4) Low oxidizing atmosphere such as hydrogen and carbon monoxide atmosphere

 

TYPE

Chemical Composition%
Ni Cr Mn Si Al
KP 90 10 / / /
KN 97 / / 3 /

Standard: IEC60584-1

TYPE EMF Versus Pt.67(mV)
100℃ 200℃ 400℃ 600℃ 800℃
KP 2.826~2.886 5.937~6.017 12.729~12.821 19.532~19.676 26.064~26.246
KN 1.224~1.256 2.140~2.180 3.600~3.644 5.271~5.331 7.080~7.160
KP-KN 4.050~4.187 8.077~8.197 16.329~16.465 24.803~25.007 33.144~33.46

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)
KP 8.6 1427 ≥490 ≥10 0.71
KN 8.6 1360 ≥390 ≥15 0.30

 

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