Thermocouple nrog kev ua tau zoo tshaj plaws thiab raug ntawm cov thermocouples uas muaj

Feem ntau siv cov thermocouples muaj xws li hauv qab no:
1. K-hom thermocouple nickel chromium (nickel silicon (nickel aluminium) thermocouple)
K-hom thermocouple yog lub hauv paus hlau thermocouple uas muaj zog oxidation tsis kam, uas tuaj yeem ntsuas qhov nruab nrab kub ntawm 0 mus rau 1300 degree thiab haum rau kev siv oxygen.
Kev siv tsis tu ncua hauv cov tshuaj lom neeg thiab cov roj inert, nrog rau lub sij hawm luv luv siv kub ntawm 1200 degree thiab lub sij hawm ntev siv kub ntawm 1000 degree. Kev sib raug zoo ntawm nws cov thermoelectric peev xwm thiab qhov kub thiab txias yog kwv yees li linear, ua rau nws siv ntau tshaj plaws thermocouple tam sim no. 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 redox cua; Thaum cov pa oxygen ib feem siab qis, cov chromium nyob rau hauv cov nickel chromium electrode yuav nyiam oxidize, ua rau muaj kev hloov pauv tseem ceeb hauv thermoelectric peev xwm. Txawm li cas los xij, qhov cuam tshuam ntawm cov roj hluav taws xob ntawm nws yog qhov me me, yog li cov hlau tiv thaiv cov raj feem ntau siv.
Qhov tsis zoo ntawm K-hom thermocouples:
(1) Kev ruaj khov ntawm qhov kub thiab txias ntawm qhov muaj peev xwm thermal yog qhov phem dua li ntawm N-hom thermocouples thiab cov hlau zoo nkauj thermocouples, thiab ntawm qhov kub siab dua (xws li super
Tshaj 1000 degree) feem ntau puas vim oxidation;
(2) Lub sij hawm luv luv thermal cycling stability tsis zoo nyob rau hauv thaj tsam ntawm 250-500 degree, uas yog, ntawm qhov kub thiab txias, thaum lub sij hawm cua sov thiab cua txias.
Ntawm lawv, qhov ntsuas kub muaj peev xwm nyeem tau sib txawv, nrog qhov sib txawv txog li 2-3 degree ;
(3) Cov electrode tsis zoo tau txais kev sib nqus sib nqus hauv qhov ntau ntawm 150-200 degree, ua rau muaj qhov sib faib ntawm chav tsev kub thiab 230 degree
Feem ntau deviating los ntawm lub rooj kawm tiav, tshwj xeeb tshaj yog thaum siv nyob rau hauv ib tug sib nqus teb, muaj feem ntau lub sij hawm ywj siab thermoelectric cuam tshuam;
(4) Lub sij hawm ntev raug rau high-throughput nruab nrab system irradiation ib puag ncig, vim muaj cov ntsiab lus xws li manganese (Mn) thiab cobalt (Co) hauv qhov tsis zoo electrode
Metamorphosis tshwm sim, ua rau tsis muaj kev ruaj ntseg thiab kev hloov pauv tseem ceeb hauv cov peev txheej thermoelectric.
2. S-hom thermocouple (platinum rhodium 10 platinum thermocouple)
Qhov zoo electrode ntawm lub thermocouple yog ua los ntawm platinum rhodium alloy muaj 10% rhodium, thiab cov electrode tsis zoo yog platinum ntshiab.
Nws cov yam ntxwv yog:
(1) Kev ua haujlwm ruaj khov thermoelectric, muaj zog oxidation tsis kam, haum rau kev siv txuas ntxiv hauv oxidizing cua, thiab tuaj yeem ncav cuag qhov kub thiab txias rau kev siv mus ntev.
Ntawm 1300 degree thiab siab dua 1400 degree, txawm nyob rau hauv huab cua, ntshiab platinum hlau yuav recrystallize, ua rau ntxhib thiab tawg nplej;
(2) High precision, nrog qhov tseeb siab tshaj plaws ntawm tag nrho cov thermocouples, feem ntau siv los ua tus qauv lossis ntsuas qhov kub siab dua;
(3) Kev siv ntau yam, zoo sib xws thiab sib hloov pauv;
(4) Lub ntsiab drawbacks yog: qhov sib txawv thermoelectric peev xwm yog me me, ua rau qis rhiab heev; Tus nqi kuj tseem kim, lub zog txhua yam yog tsawg, thiab nws tsis yog
Tsim nyog siv rau hauv kev txo cov cua los yog nyob rau hauv tej yam kev mob nrog hlau vapor.

3. E-hom thermocouple (nickel chromium tooj liab nickel [constantan] thermocouple)
E-hom thermocouple yog ib yam khoom tshiab, nrog rau qhov zoo electrode ua los ntawm nickel chromium alloy thiab tsis zoo electrode ua los ntawm tooj liab nickel alloy (constantan). Nws loj tshaj feature
Ntawm cov thermocouples uas nquag siv, lub peev xwm thermoelectric yog qhov siab tshaj plaws, qhia txog qhov siab tshaj plaws; Txawm hais tias nws daim ntawv thov ntau yam tsis yog qhov dav li ntawm K-hom khub niam txiv, nws feem ntau xaiv nyob rau hauv cov xwm txheej uas yuav tsum tau muaj siab rhiab heev, tsis tshua muaj thermal conductivity, thiab muaj peev xwm ua rau muaj kev tiv thaiv loj; Cov kev txwv thaum siv yog tib yam li cov K-hom, tab sis lawv tsis tshua muaj kev cuam tshuam rau corrosion hauv ib puag ncig nrog cov av noo siab.
4. N-hom thermocouple (nickel chromium silicon nickel silicon thermocouple)
Cov yam ntxwv tseem ceeb ntawm cov thermocouple no yog cov kev tswj xyuas kub thiab oxidation tsis kam qis dua 1300 degree, ruaj khov mus ntev, thiab luv luv thermal cycling.
Kev ua tau zoo, kev tiv thaiv hluav taws xob nuclear, thiab tsis kub tsis kam. Tsis tas li ntawd, nyob rau hauv qhov ntau ntawm 400-1300 degree , cov kab hluav taws xob cov yam ntxwv ntawm N-hom thermocouples zoo dua li cov K-hom thermocouples; Tab sis nyob rau hauv qhov kub tsis tshua muaj siab (-200~ 400 degree), muaj qhov yuam kev loj uas tsis yog-linear, thiab tib lub sijhawm, cov khoom siv nyuaj thiab nyuaj rau kev ua haujlwm.
5. J-hom thermocouple (hlau constantan thermocouple)
J-hom thermocouple: Qhov zoo electrode ntawm no thermocouple yog cov hlau ntshiab, thiab cov electrode tsis zoo yog constantan (tooj liab nickel alloy), uas yog tus yam ntxwv ntawm nws tus nqi qis thiab tsim nyog.
Siv los txo lossis tsis muaj cua sov rau lub tshuab nqus tsev oxidation, nrog rau qhov kub ntawm -200 txog 800 degree, tab sis feem ntau siv kub tsuas yog qis dua 500 degree vim tias dhau qhov kub no, qhov oxidation tus nqi ntawm ferroelectric electrode accelerates. Yog siv txoj kab uas hla tuab, nws tseem tuaj yeem siv rau qhov kub thiab txias thiab muaj lub neej ntev dua; Cov thermocouple no tiv taus corrosion los ntawm hydrogen (H2) thiab carbon monoxide (CO) gases, tab sis tsis tuaj yeem siv rau hauv qhov kub siab (xws li 500 degree) sulfur-muaj (S) cua.
6. T-hom thermocouple (tooj liab nickel thermocouple)
T-hom thermocouple: Qhov zoo electrode ntawm no thermocouple yog tooj liab ntshiab, thiab qhov tsis zoo electrode yog tooj liab nickel alloy (tseem hu ua constantan). Nws cov yam ntxwv tseem ceeb yog:
Ntawm lub hauv paus hlau thermocouples, nws muaj qhov tseeb tshaj plaws thiab zoo sib xws ntawm thermoelectric electrodes; Nws ua haujlwm kub yog -200 ~ 350 degree . Vim qhov yooj yim oxidation ntawm tooj liab kub electrodes thiab yooj yim detachment ntawm oxide zaj duab xis, nws yog feem ntau tsis pub tshaj 300 degree thaum siv nyob rau hauv ib tug oxidizing cua. Hauv thaj tsam ntawm -200 ~ 300 degree, lawv qhov rhiab heev yog qhov siab. Lwm tus yam ntxwv ntawm tooj liab constantan thermocouples yog lawv cov nqi qis, uas yog pheej yig tshaj ntawm ob peb cov khoom siv feem ntau siv.
7. R-hom thermocouple (platinum rhodium 13-platinum thermocouple)
Qhov zoo electrode ntawm lub thermocouple yog 13% platinum rhodium alloy, thiab cov electrode tsis zoo yog platinum ntshiab. Piv nrog rau S-hom, nws qhov peev xwm tus nqi yog 15% siab dua
Sab laug thiab txoj cai, lwm yam kev ua tau zoo yuav luag tib yam. Hom thermocouple no feem ntau yog siv los ua cov thermocouple siab kub hauv kev lag luam Nyij Pooj, thaum nws tsis tshua siv hauv Suav teb.