Hom hom thiab cov yam ntxwv tseem ceeb ntawm thermocouples

Cov lej kawm tiav ntawm cov thermocouples feem ntau suav nrog K, T, E, J, N, S, R, B, thiab lwm yam. Ntawm lawv, K, T, E, J, N yog cov khoom siv hluav taws xob pheej yig, thiab S, R, B. belongs rau precious hlau thermocouples.
K-qib thermocouple (tseem hu ua K-hom thermocouple), tseem hu ua nickel chromium nickel silicon (nickel aluminium) thermocouple, muaj qhov zoo electrode ua los ntawm nickel chromium alloy thiab tsis zoo electrode ua los ntawm nickel silicon (nickel aluminium) alloy. Nws cov yam ntxwv yog muaj zog oxidation tsis kam, thiab nws yog haum rau kev siv tas li nyob rau hauv oxidizing ib puag ncig. Lub sijhawm siv sijhawm ntev yog 1000 degree, thiab siv sijhawm luv luv yog 1200 degree. Kev sib raug zoo ntawm nws cov thermal muaj peev xwm thiab qhov kub thiab txias yog kwv yees li linear, thiab tam sim no nws yog cov thermocouple feem ntau siv. Txawm li cas los xij, nws tsis tsim nyog rau kev siv cov hlau liab qab hauv lub tshuab nqus tsev, muaj cov sulfur, carbon uas muaj cov cua sov, thiab hloov pauv cov cua sov. Tsis tas li ntawd, nws muaj qhov yuam kev tseem ceeb hauv qab 0 degree.
T-qib thermocouples (tseem hu ua T-hom thermocouples), tseem hu ua tooj liab nickel (constantan) thermocouples, muaj cov tooj liab zoo electrode thiab tooj liab nickel (constantan) alloy tsis zoo electrode. Lawv yog tus cwj pwm los ntawm qhov ntsuas kub thiab qhov zoo sib xws ntawm cov thermoelectric electrode ntawm txhua qhov pheej yig hlau thermocouples. Lawv feem ntau yog siv los ntsuas qhov kub thiab txias ntawm -200 thiab 350 degree, thiab lawv qhov tseeb thiab rhiab heev yog qhov siab nyob rau hauv qhov ntau. Txawm li cas los xij, vim qhov yooj yim oxidation ntawm tooj liab thiab yooj yim detachment ntawm oxide zaj duab xis, nws feem ntau tsis pub tshaj 300 degree thaum siv nyob rau hauv ib qho chaw oxidizing.
E-qib thermocouple (tseem hu ua E-hom thermocouple), tseem hu ua npib tsib xee chromium tooj liab nickel (constantan) thermocouple, muaj qhov zoo electrode ua los ntawm nickel chromium alloy thiab tsis zoo electrode ua los ntawm tooj liab nickel (constantan) alloy. Nws tus yam ntxwv yog hais tias nyob rau hauv feem ntau siv thermocouples, nws muaj ib tug siab thermoelectric electromotive quab yuam, piv txwv li siab rhiab heev, thiab yog haum rau kev siv tas li nyob rau hauv oxidizing thiab inert ib puag ncig ntawm qhov kub ntawm 0-800 degree . Nws daim ntawv thov ntau tsis dav li K-couple, tab sis nws yog feem ntau siv nyob rau hauv tej yam kev mob uas yuav tsum tau siab rhiab heev, tsis tshua muaj thermal conductivity, thiab muaj peev xwm tiv taus loj. Zoo corrosion kuj rau ib puag ncig nrog high humidity.
J-qib thermocouple (tseem hu ua J-hom thermocouple), tseem hu ua hlau-constantan thermocouple, muaj cov hlau ntshiab zoo electrode thiab ib qho tsis zoo ntawm cov hlau tsis zoo electrode. Nws cov yam ntxwv yog tias nws pheej yig, nrog rau qhov kub thiab txias ntawm -200 txog 800 degree . Txawm li cas los xij, qhov kub uas siv tau tsuas yog qis dua 500 degree, vim tias dhau qhov ntsuas kub no, oxidation tus nqi ntawm ferroelectric electrode accelerates. Txawm li cas los xij, nws tiv taus H2 thiab CO roj corrosion thiab feem ntau siv hauv cov roj refining thiab tshuaj industries, Tab sis nws tsis tuaj yeem siv nyob rau hauv ib puag ncig uas kub siab (xws li 500 degree) uas muaj leej faj (S).
N qib thermocouple (tseem hu ua N-hom thermocouple), tseem hu ua npib tsib xee chromium silicon nickel silicon thermocouple, muaj qhov zoo electrode ua los ntawm nickel chromium silicon alloy thiab tsis zoo electrode ua los ntawm nickel silicon alloy. Nws cov yam ntxwv yog muaj zog kub oxidation tsis kam ntawm 1300 degree, zoo ruaj khov nyob rau hauv lub sij hawm ntev ntawm thermoelectric muaj peev xwm thiab reproducibility ntawm lub sij hawm luv luv thermal cycles, zoo tsis kam mus rau nuclear hluav taws xob thiab tsis kub kub, thiab ib feem hloov S qib thermocouple. Tsis tas li ntawd, nyob rau hauv thaj tsam ntawm 400-1300 degree , nws cov khoom siv hluav taws xob muaj qhov sib txawv zoo dua li cov khub niam txiv K-hom, tab sis nws qhov kev ua yuam kev tsis yog qhov loj ntawm -200-400 degree .
S-qib thermocouple (tseem hu ua S-type thermocouple), tseem hu ua platinum rhodium 10 platinum thermocouple, muaj qhov zoo electrode ua los ntawm platinum rhodium 10 alloy thiab tsis zoo electrode ua los ntawm cov platinum ntshiab. Nws cov yam ntxwv yog muaj zog oxidation tsis kam, thiab nws yog haum rau kev siv tas li nyob rau hauv oxidizing ib puag ncig. Lub sijhawm siv sijhawm ntev yog 1400 degree, thiab siv sijhawm luv luv yog 1600 degree. Ntawm tag nrho cov thermocouples, nws muaj qib * * qib hauv txhua lub thermocouples