Termojuft K turi Alumel / Chromel Rod / Stik / Bar 6mm 8mm 9mm 10mm 12mm
Termojuft K turi Alumel /Xrom tayoq/ Stick / Bar 6mm 8mm 9mm 10mm 12mm
TYPE K (CHROMEL vs ALUMEL) oksidlovchi, inert yoki quruq qaytaruvchi atmosferalarda qo'llaniladi. U oltingugurtli va marginal oksidlovchi atmosferalardan himoyalangan bo'lishi kerak. Bu ishonchli va yuqori haroratlarda yuqori aniqlikka ega.
1.KimyoviyTarkibi
| Material | Kimyoviy tarkibi (%) | ||||
| Ni | Cr | Si | Mn | Al | |
| KP (Chromel) | 90 | 10 | |||
| KN (Alumel) | 95 | 1-2 | 0,5-1,5 | 1-1,5 | |
2.Fizik xususiyatlari va mexanik xususiyatlari
| Material |
Zichlik (g/sm3) | Erish nuqtasi ℃) | Kuchlanish kuchi (Mpa) | Ovoz qarshiligi (mŌ.sm) | Uzayish darajasi (%) |
| KP (Chromel) | 8.5 | 1427 | >490 | 70,6(20℃) | >10 |
| KN (Alumel) | 8.6 | 1399 | >390 | 29,4(20℃) | >15 |
3.Har xil haroratda EMF qiymat diapazoni
| Material | EMF qiymati Vs Pt(mkV) | |||||
| 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 |
| EMF qiymati Vs Pt(mkV) | ||||
| 700 ℃ | 800 ℃ | 900 ℃ | 1000 ℃ | 1100 ℃ |
| 22845~22999 | 26064~26246 | 29223~29411 | 32313~32525 | 35336~35548 |
| 6167~6247 | 7080~7160 | 7959~8059 | 8807 ~ 8907 | 9617~9737 |
| Termojuftning xilma-xilligi va indeksi | ||
| Turli xillik | Turi | O'lchov diapazoni (°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 |
0,5 ″ 12,7 mm KP Chromel KN Alumel termojuft K tipidagi rod ilovasi
K tipining o'ziga xos xususiyati shundaki, u kuchli oksidlanishga qarshi ko'rsatkichga ega va doimiy ravishda oksidlovchi va inert atmosferada ishlatilishi kerak. Uzoq muddatli foydalanish harorati 1000 ℃ va qisqa muddatli 1200 ℃. Bu barcha termojuftlar orasida eng ko'p qo'llaniladi; (uni gaz atmosferasini kamaytirish uchun ishlatish mumkin emas).
Termojuftning ishlash va o'lchash harorati diapazoni:
| Termojuft materiali | Ishlash harorati oralig'i va bardoshlik | |||||
| I sinf | II sinf | |||||
| indeks | Anod | katod | Haroratni o'lchash | Tolerantlik | Haroratni o'lchash | Tolerantlik |
| K | NiCr10 | NiAl2 | -40℃-1000℃ | ±1,5℃ yoki ±0,4%*T | 40℃-1200℃ | ± 2,5 ℃ yoki 0,75% * T |
| T | Cu | CuNi40 | -40℃-350℃ | 40℃-350℃ | ±1℃ yoki 0,75%*T | |
| J | Fe | CuNi40 | -40℃-750℃ | 40℃-750℃ | ± 2,5 ℃ yoki 0,75% * T | |
| E | NiCr10 | CuNi45 | -40℃-800℃ | 40℃-900℃ | ||
| N | NiCr14Si | NiSi4Mg | -40℃-1000℃ | 40℃-1200℃ | ± 2,5 ℃ yoki 0,75% * T | |
| R | Pt-13% Rh | Pt | 0℃-1000℃ | 0℃-600℃ | ±1,5 ℃ | |
| S | Pt-10% Rh | 1000 ℃ - 1600 ℃ | ±(1+0,003) | 600 ℃ - 1600 ℃ | 0,25%*T | |
| B | Pt-30% Rh | Pt-6% Rh | - | - | 600 ℃ - 1700 ℃ | ±1,5 ℃ yoki 0,25% * T |
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