Yuav Ua Li Cas Xaiv Ntawm J, K, thiab N Hom Thermocouples rau Kub Khiav?

Xaiv qhov zoo thermocouple hom (J, K, lossis N) rau daim ntawv thov kev sib tw kub yog qhov kev txiav txim siab tseem ceeb uas cuam tshuam rau qhov raug, lub neej ntev, thiab tus nqi. Txhua hom muaj cov yam ntxwv sib txawv uas ua rau nws haum rau cov xwm txheej sib txawv. Hom J (Iron-Constantan): Qhov no yog hom qub tshaj plaws thiab feem ntau siv rau kev siv qis dua - kub. Nws qhov rhiab heev yog li 50 µV / degree, uas siab dua Hom K, muab lub teeb liab muaj zog. Cov ceg zoo yog hlau, uas muaj qhov cuam tshuam rau oxidation siab tshaj 500 degree, yog li Hom J raug txwv rau qhov kub siab tshaj plaws ntawm 600 degree. Hauv cov ntawv thov kub khiav, nws tsim nyog rau thaj chaw ua haujlwm hauv qab 300 degree, xws li sprue bushings lossis qis-kub nozzles rau polyethylene lossis polypropylene. Nws qhov zoo dua yog tus nqi qis dua thiab muaj txiaj ntsig zoo. Txawm li cas los xij, cov ceg hlau yog hlau nplaum, uas tuaj yeem ua suab nrov hauv cov hlau nplaum. Nws kuj rusts nyob rau hauv ib puag ncig humid. Hom K (Nickel{16}}Chromium/Nickel-Alumel): Qhov no yog lub chaw ua haujlwm ntawm kev lag luam kub khiav, muab qhov kub thiab txias (txog 1200 degree) thiab ruaj khov zoo. Nws rhiab heev yog hais txog 40 µV / degree. Nws yog haum rau feem ntau cov kev siv kub khiav mus txog 400 degree. Txawm li cas los xij, Hom K yog qhov tshwm sim hu ua "ntsuab rot" ntawm 400-600℃, qhov twg cov chrome oxidizes thiab tsim cov nplai ntsuab, ua rau ya raws. Hauv cov ntawv thov khiav kub ua haujlwm ntawm 350-420℃(piv txwv li, rau PEEK), Hom K tuaj yeem nthuav tawm nrawm nrawm dhau sijhawm. Hom N (Nicrosil-Nisil): Qhov no yog qhov kev xaiv niaj hnub rau kev siv qhov kub thiab txias. Nws muaj qhov rhiab heev zoo ib yam li Hom K (txog 38 µV / degree) tab sis muaj kev tiv thaiv zoo tshaj rau oxidation thiab drift. Nws yog qhov ruaj khov mus txog 1200℃thiab tsis raug rau "ntsuab rot" lossis cov teebmeem sib nqus ntawm Hom J. Hauv kev siv kub khiav, Hom N yog qhov pom zoo xaiv rau kev ua haujlwm kub siab tshaj 350 degree. Nws qhov drift tus nqi ntawm 400℃yog tsawg dua 0.5℃ib 1000 teev, piv rau 1.5℃rau Hom K. Txawm li cas los xij, Hom N yog kim dua thiab tsawg dua. Thaum xaiv, xav txog cov yam ntxwv no: Kub: Yog tias thaj chaw ua haujlwm qis dua 300 degree, Hom J txaus thiab tus nqi- siv tau. Yog tias nws ua haujlwm 300-350 degree, Hom K yog qhov kev xaiv zoo. Yog tias nws ua haujlwm siab tshaj 350 degree, Hom N yog qhov zoo dua. Drift: Yog tias cov pwm khiav 24/7 thiab hloov pauv thermocouple yog kim (piv txwv li, rau pwm loj), nqis peev hauv Hom N kom txo tau cov teeb meem cuam tshuam txog qhov zoo. Tus nqi: Hom J yog pheej yig tshaj, Hom K yog nruab nrab, thiab hom N yog kim tshaj. Muaj: Hom K thiab Hom J muaj dav; Hom N tej zaum yuav muaj sij hawm ua ntej ntev dua. Controller Compatibility: Xyuas kom tus maub los tau configured rau hom xaiv. Los ntawm kev ua tib zoo tshuaj xyuas cov xwm txheej no, cov kws tsim khoom tuaj yeem xaiv hom thermocouple uas muaj qhov sib npaug zoo tshaj plaws ntawm kev ua tau zoo, kev ua haujlwm ntev, thiab tus nqi rau lawv daim ntawv thov tshwj xeeb. Hauv ntau cov nroj tsuag, Hom K tseem yog tus qauv, tab sis rau qhov chaw kub kub tseem ceeb, Hom N tau dhau los ua qhov kev xaiv.