Type K Thermocouple Wire

Type K Thermocouple Wire
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Type K thermocouple alloy wire (Chromel vs. Alumel) is designed for use in oxidizing, inert, or dry reducing atmospheres. It can withstand short-term exposure to vacuum conditions, ensuring stable and precise temperature measurements. However, it should be protected from sulfur-containing environments and mildly oxidizing conditions, as these can affect its performance. Type K thermocouples offer high reliability and accuracy at elevated temperatures, making them a preferred choice for various industrial applications.

Chemical composition (%)
Material Chemical composition (%)
Ni Cr Si Mn Al
KP(Chromel) 90 10      
KN(Alumel) 95   1-2 0.5-1.5 1-1.5
Physical and mechanical properties
Material Density (g/cm3) Melting point (℃) Tensile strength (Mpa) Volume resistivity (μΩNaN) Elongation rate (%)
KP (Chromel) 8.5 1427 >490 70.6(20℃) >10
KN (Alumel) 8.6 1399 >390 29.4(20℃) >15
EMF value range at different temperatures
Material EMF value Vs Pt(μV)
100℃ 200℃ 300℃ 400℃ 500℃ 600℃
KP (Chromel) 2816~2896 5938~6018 9298~9378 12729~12821 16156~16266 19532~19676
KN (Alumel) 1218~1262 2140~2180 2849~2893 3600~3644 4403~4463 5271~5331
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