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Fe/CuNi Type J Wire Products Thermocouple Alloy Bare Wire
Product Description
Fe/CuNi Type J Thermocouple Alloy Bare Wire
Product Description
Type J Thermocouple is frequently used for its low cost and high EMF It can be used in oxidizing conditions up to 760°C. For higher temperatures, it is recommended to use large wire diameters.
Type J thermocouple is suitable for oxidizing, reducing inert atmosphere or vacuum.
Product Parameters
1.Chemical composition and mechanical properties
| Product | Chemical Composition/% | Density (g/cm3) | Melting point (ºC) |
Resistivity (μΩ.cm) |
Tensile Strength (Mpa) |
|||
| Fe | Cu | Ni | ||||||
| JP(+) Pure Iron | 100 | - | - | 7.8 | 1402 | 12 | ≥240 | |
| JN(-) Copper Nickel |
- | 55 | 45 | 8.8 | 1220 | 49 | ≥390 | |
2.Maximum operating temperatures
| Alloy wire Dia/mm |
The long-term operating temperatures/°C |
The short-term operating temperatures/°C |
| 0.3,0.5 | 300 | 400 |
| 0.8,1.0,1.2 | 400 | 500 |
| 1.6,2.0 | 500 | 600 |
| 2.5,3.2 | 600 | 750 |
3.Couple JP/JN EMF reference table (μV)
| Operating temperatures/°C |
Nominal value of thermoelectric EMF |
Level I | |
| Tolerance | Range of EMF | ||
| 100 | 5 269 | ±82 | 5 187-5 351 |
| 200 | 10 779 | ±83 | 10 696-10 862 |
| 300 | 16 327 | ±83 | 16 244-16 410 |
| 400 | 21 848 | ±88 | 21 760-21 936 |
| 500 | 27 393 | ±112 | 27 281-27 505 |
| 600 | 33 102 | ±140 | 32 962-33 242 |
| 700 | 39 132 | ±174 | 38 958-39 306 |
| 750 | 42 281 | ±192 | 42 089-42 437 |
| 760 | 42 919 | ±194 | 42 725-43 113 |
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