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Fe-CuNi thermocouple (type J) is also named Fe- Constantan thermocouple. The positive legFe(JP) is made by pure iron, and the main chemical composition of the negative leg Constantan (JN) is Cu: Ni= 55%: 45%. Although they are all called Constantan, JN does not give the same EMF output curve as EN and TN; it cannot be instead by other Constantan.
The operating temperature range of type Jthermocouple is-210-1200℃, but it is usually used in the temperature range 0-750℃ due to embrittlement of Iron.
| Type | Chemical composition (%) | ||||
| Ni | Cu | Mn | Si | Fe | |
| JP (Fe, Positive) | / | / | / | / | 100 |
| JN (CuNi, Negative) | 45 | 55 | / | / | / |
| Standard | IEC60584-1 | ||||
| Type | EMF Versus Pt.67(mV) | ||||
| 100℃ | 200℃ | 300℃ | 400℃ | 600℃ | |
| JP-JN | 5.207–5.331 | 10.717–10.841 | 16.244–16.410 | 21.760–21.936 | 32.956–33.236 |
| Physical property | |||||
| Type | Density at 20℃ (g/cm³) | Melting point (℃) | Tensile Strength (Mpa, Soft annealed condition in 20℃) | Elongation (%) (Soft annealed condition in 20℃) | Resistivity at 20℃ (μΩ·m) |
| JP | 7.8 | 1407 | ≥240 | ≥20 | 0.12 |
| JN | 8.9 | 1220 | ≥390 | ≥25 | 0.49 |
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