Txoj kab uas hla 0.2 hli hom K Thermocouple Hlau TC hlau KP KN (Hom K / N)
Cov xov hlau thermocouple tso cai rau ntsuas qhov kub thiab txias hauv hluav taws xob.
Ib qho kev tsim kho thermocouple ib txwm muaj ib khub hlau sib txawv uas tau sib txuas ua ke ntawm qhov chaw sensing thiab txuas nrog lub cuab yeej ntsuas voltage ntawm qhov kawg.
Thaum ib qho kev sib tshuam kub dua li lwm qhov, lub zog thermal "electromotive" (hauv millivolts) raug tsim tawm uas yog kwv yees li sib npaug rau qhov sib txawv ntawm qhov kub ntawm qhov kub thiab txias sib tshuam.
NiCr-Ni (Hom K) thermocouple hlau pom tias siv dav tshaj plaws hauv txhua lub thermocouple basemetal, ntawm qhov kub siab tshaj 500 ° C.
Hom K thermocouple hlau muaj zog tiv taus oxidation dua li lwm cov thermocouples hlau. Nws muaj EMF siab tiv thaiv Platinum 67, qhov kub zoo heev, rhiab heev thiab ruaj khov, nrog rau tus nqi qis. Nws raug pom zoo rau oxidizing lossis inert atmospheres, tab sis tsis tuaj yeem siv ncaj qha rau hauv cov xwm txheej hauv qab no:
(1) Lwm txoj hauv kev oxidizing thiab txo cov huab cua.
(2) Huab cua nrog cov pa roj sulfur.
(3) Lub sijhawm ntev hauv lub tshuab nqus tsev.
(4) Huab cua tsis muaj oxidizing xws li huab cua hydrogen thiab carbon monoxide.
Cov Txheej Txheem Nthuav Dav
| Cov Tshuaj Muaj Peev Xwm rau cov xaim thermocouple | |||||
| Lub Npe Tus Neeg Coj | Polarity | Cov Cai | Cov Tshuaj Lom Zem Nominal /% | ||
| Ni | Cr | Si | |||
| Ni-Cr | Zoo | KP | 90 | 10 | – |
| Ni- Si | Tsis zoo | KN | 97 | – | 3 |
| Kub Ua Haujlwm ntawm cov xov hlau thermocouple | ||
| Txoj kab uas hla/hli | Kub ua haujlwm ntev / ºC | Lub sijhawm luv luv ua haujlwm kub / ºC |
| 0.3 | 700 | 800 |
| 0.5 | 800 | 900 |
| 0.8,1.0 | 900 | 1000 |
| 1.2,1.6 | 1000 | 1100 |
| 2.0,2.5 | 1100 | 1200 |
| 3.2 | 1200 | 1300 |
Daim ntawv thov ntawm thermocouple hlau:
1. Kev Ua Kub - Cov roj hlawv rau qhov cub
2. Kev Txias - Cov Tub Yees
3. Kev tiv thaiv cav - Kub thiab kub ntawm qhov chaw
4. Kev tswj kub siab - Hlau casting

