Termokopel Tipe J kerep digunakake amarga regane murah lan EMF sing dhuwur. Bisa digunakake ing kondisi oksidasi nganti 760°C. Kanggo suhu sing luwih dhuwur, disaranake nggunakake diameter kawat sing gedhe.
Termokopel tipe J cocok kanggo oksidasi, reduksi atmosfer inert, utawa vakum.
| Produk | Komposisi Kimia/% | Kapadhetan (g/cm3) | Titik leleh (ºC) | Resistivitas (μΩ.cm) | Kekuwatan Tarik (Mpa) | |||
| Fe | Cu | Ni | ||||||
| Wesi Murni JP(+) | 100 | - | - | 7.8 | 1402 | 12 | ≥240 | |
| JN(-) Tembaga Nikel | - | 55 | 45 | 8.8 | 1220 | 49 | ≥390 | |
2. Suhu operasi maksimal
| Kawat paduan Diameter/mm | Operasi jangka panjang sing suhu/°C | Operasi jangka pendek kasebut suhu/°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 |
| Operasi suhu/°C | Nilai nominal saka EMF termoelektrik | Tingkat I | |
| Toleransi | Rentang 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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