| Customization: | Available |
|---|---|
| Product Type: | Rod |
| Material: | Chromel Alumel |
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TYPE K (CHROMEL vs ALUMEL ) is used in oxidizing, inert or dry reducing atmospheres. It must be protected from sulfurous and marginally oxidizing atmospheres. It is reliable and has high accurate at high temperatures.
1. 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 | |
2. Physical Properties and Mechnical Properties
| Material |
Density(g/cm3) |
Melting pointºC) |
Tensile Strength(Mpa) |
Volume resistivity(μΩ.cm) |
Elongation rate (%) |
| KP(Chromel) | 8.5 | 1427 | >490 | 70.6(20ºC) | >10 |
| KN(Alumel) | 8.6 | 1399 | >390 | 29.4(20ºC) | >15 |
3. EMF Value Range at Different Temperature
| Material | EMF value Vs Pt(μV) | |||||
| 100ºC | 200ºC | 300ºC | 400ºC | 500ºC | 600ºC | |
| 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 |
| EMF value Vs Pt(μV) | ||||
| 700ºC | 800ºC | 900ºC | 1000ºC | 1100ºC |
| 22845~22999 | 26064~26246 | 29223~29411 | 32313~32525 | 35336~35548 |
| 6167~6247 | 7080~7160 | 7959~8059 | 8807~8907 | 9617~9737 |
| Thermocouple Variety and Index | ||
| Variety | Type | Measurement Range(°C) |
| NiCr-NiSi | K | -200-1300 |
| NiCr-CuNi | E | -200-900 |
| Fe-CuNi | J | -40-750 |
| Cu-CuNi | T | -200-350 |
| NiCrSi-NiSi | N | -200-1300 |
| NiCr-AuFe0.07 | NiCr-AuFe0.07 | -270-0 |
The characteristic of Type K is that it has strong anti-oxidation performance, and should be used continuously in an oxidizing and inert atmosphere. The long-term use temperature is 1000ºC and the short-term 1200 ºC. It is the most widely used among all thermocouples; (it cannot be used reducing gas atmosphere).
Thermocouple Working and Measuring Temperature Range:
| Thermocouple Material | Working temperature Range and Tolerence | |||||
| Class I | Class II | |||||
| Index | Anode | Cathode | Measuring termperature | Tolerence | Measuring termperature | Tolerence |
| K | NiCr10 | NiAl2 | -40ºC-1000ºC | ±1.5ºC or ±0.4%*T | 40ºC-1200ºC | ±2.5ºC or 0.75%*T |
| T | Cu | CuNi40 | -40ºC-350ºC | 40ºC-350ºC | ±1ºC or 0.75%*T | |
| J | Fe | CuNi40 | -40ºC-750ºC | 40ºC-750ºC | ±2.5ºC or 0.75%*T | |
| E | NiCr10 | CuNi45 | -40ºC-800ºC | 40ºC-900ºC | ||
| N | NiCr14Si | NiSi4Mg | -40ºC-1000ºC | 40ºC-1200ºC | ±2.5ºC or 0.75%*T | |
| R | Pt-13%Rh | Pt | 0ºC-1000ºC | 0ºC-600ºC | ±1.5ºC | |
| S | Pt-10%Rh | 1000ºC-1600ºC | ±(1+0.003) | 600ºC-1600ºC | 0.25%*T | |
| B | Pt-30%Rh | Pt-6%Rh | - | - | 600ºC-1700ºC | ±1.5ºC or 0.25%*T |
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