Termojuft turi K Alumel / Chromel tayoqchasi / tayoqchasi / novdasi 6mm 8mm 9mm 10mm 12mm
Termojuft turi K Alumel /Chromel tayoqchasi/ Tayoqcha / Bar 6mm 8mm 9mm 10mm 12mm
K TYPE (CHROMEL va ALUMEL) oksidlovchi, inert yoki quruq qaytaruvchi atmosferalarda qo'llaniladi. U oltingugurtli va ozgina oksidlovchi atmosferalardan himoyalangan bo'lishi kerak. U ishonchli va yuqori haroratlarda yuqori aniqlikka ega.
1.KimyoviyTarkibi
| Materiallar | Kimyoviy tarkibi (%) | ||||
| Ni | Cr | Si | Mn | Al | |
| KP (Xrom) | 90 | 10 | |||
| KN (Alumel) | 95 | 1-2 | 0,5-1,5 | 1-1.5 | |
2.Fizik xususiyatlar va mexanik xususiyatlar
| Materiallar |
Zichlik (g/sm3)3) | Erish nuqtasi ℃) | Cho'zilish kuchi (Mpa) | Hajm qarshiligi (μΩ.cm) | Uzayish tezligi (%) |
| KP (Xrom) | 8.5 | 1427-yil | >490 | 70.6 (20℃) | >10 |
| KN (Alumel) | 8.6 | 1399-yil | >390 | 29.4 (20℃) | >15 |
3.Turli haroratlarda EMF qiymat diapazoni
| Materiallar | EMF qiymati Vs Pt(μV) | |||||
| 100℃ | 200℃ | 300℃ | 400℃ | 500℃ | 600℃ | |
| KP (Xrom) | 2816~2896 | 5938~6018 | 9298~9378 | 12729~12821 | 16156~16266 | 19532~19676 yillar |
| KN (Alumel) | 1218~1262 | 2140~2180 | 2849~2893 | 3600~3644 | 4403~4463 | 5271~5331 |
| EMF qiymati Vs Pt(μV) | ||||
| 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-tumanlik | Turi | O'lchov oralig'i (°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 Type K Rod Ilovasi
K turining o'ziga xos xususiyati shundaki, u kuchli antioksidlanish xususiyatiga ega va oksidlovchi va inert atmosferada doimiy ravishda ishlatilishi kerak. Uzoq muddatli foydalanish harorati 1000 ℃ va qisqa muddatli foydalanish harorati 1200 ℃. Bu barcha termojuftlar orasida eng keng qo'llaniladigan hisoblanadi; (gaz atmosferasini kamaytirish uchun ishlatilishi mumkin emas).
Termojuftning ishlash va o'lchash harorati oralig'i:
| Termojuft materiali | Ish harorati oralig'i va bardoshlik | |||||
| I sinf | II sinf | |||||
| Indeks | Anod | Katod | Haroratni o'lchash | Bag'rikenglik | Haroratni o'lchash | Bag'rikenglik |
| 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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