Product Details
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
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TYPE
|
Chemical Composition%
|
Ni
|
Cr
|
Mn
|
Si
|
Al
|
KP
|
90
|
10
|
/
|
/
|
/
|
KN
|
97
|
/
|
/
|
3
|
/
|
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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
|
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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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