Ua ntej, ntau lub thermocouples muaj xim - coded. Lub xim - coding system no yog ib qho kev siv tau sai, tab sis nws yog ib qho tseem ceeb uas yuav tsum tau ceev faj. Piv txwv li, hauvhom K thermocouples, uas yog cov thermocouples siv dav tshaj plaws vim lawv qhov kub thiab txias dav thiab ruaj khov zoo, cov hlau zoo feem ntau yog ua los ntawm chromel thiab feem ntau yog xim daj, thaum cov hlau tsis zoo, ua los ntawm alumel, feem ntau yog xim liab. Txawm li cas los xij, cov qauv xim - coding yuav txawv nyob rau hauv thaj chaw sib txawv lossis raws li cov chaw tsim khoom sib txawv. Hauv qee qhov tsis yog tus qauv lossis cov khoom siv qub dua, cov xim yuav tsis ua raws li cov lus cog tseg ib txwm muaj. Yog li ntawd, tsis txhob cia siab rau xim rau kev txheeb xyuas xwb; nws yuav tsum tau siv ua tus qhia pib.

Lwm txoj kev txhim khu kev qha yog xyuas cov ntaub ntawv hlau. Cov thermocouples sib txawv yog ua los ntawm cov hlau sib txawv, thiab txhua hom muaj cov hlau zoo thiab tsis zoo raws li cov ntaub ntawv no. Piv txwv li, hauvhom J thermocouples, cov hlau zoo yog ua los ntawm hlau, paub txog nws cov lus teb zoo hauv qee qhov kub thiab txias, thiab cov hlau tsis zoo yog constantan, uas muaj kev ruaj khov zoo heev thiab sib xws nrog hlau. Los ntawm kev xa mus rau cov lus qhia tshwj xeeb ntawm hom thermocouple, uas qhia meej txog cov khoom sib xyaw thiab polarity ntawm txhua hom, cov neeg siv tuaj yeem txiav txim siab qhov polarity kom raug nrog kev paub tseeb dua. Tsis tas li ntawd, qee cov thermocouples siab heev tuaj nrog cov ntaub ntawv datasheets uas tsis yog tsuas yog teev cov ntaub ntawv tab sis kuj muab cov ntaub ntawv ntxiv txog cov yam ntxwv hluav taws xob xav tau ntsig txog cov hlau zoo thiab tsis zoo.

Peb lub tuam txhab cov khoom siv hlau thermocouple muaj ntau yam zoo hauv qhov no. Peb cim cov xov hlau zoo thiab tsis zoo rau ntawm peb cov khoom, tsis yog tsuas yog siv cov xim sib txawv xwb tab sis kuj muaj cov ntawv lo meej. Cov ntawv lo no luam tawm siv cov kua mem zoo, ruaj khov uas yuav tsis ploj lossis puas yooj yim, txawm tias nyob hauv qhov chaw ua haujlwm hnyav. Lub kaw lus txheeb xyuas ob npaug no ua kom cov neeg siv tuaj yeem txheeb xyuas cov xov hlau sai thiab raug, txuag lub sijhawm thiab txo qhov kev pheej hmoo ntawm kev sib txuas tsis raug.

Ntxiv mus, peb cov xov hlau thermocouple yog ua los ntawm cov hlau zoo nrog kev ruaj khov thermal zoo heev thiab ruaj khov. Cov txheej txheem tsim khoom suav nrog kev tswj hwm zoo nruj ntawm txhua theem, txij li kev xaiv cov khoom siv raw mus rau qhov kawg ntim. Txawm hais tias nws yog rau kev siv hauv kev lag luam kub siab, xws li kev tsim hlau qhov twg kub tuaj yeem ncav cuag qib siab heev, lossis kev sim tshawb fawb meej uas xav tau qhov tseeb me ntsis, peb cov khoom tuaj yeem tswj tau qhov ua tau zoo ruaj khov thiab cov txiaj ntsig ntsuas raug. Peb kuj ua qhov kev sim nruj rau txhua pawg ntawm cov xov hlau thermocouple, suav nrog kev sim rau kev ua hluav taws xob conductivity, thermal emf ruaj khov, thiab lub zog kho tshuab. Nrog cov txheej txheem tswj hwm zoo nruj no, peb lav tias cov xov hlau zoo thiab tsis zoo hauv peb cov khoom thermocouple ua tau raws li cov qauv kev lag luam siab tshaj plaws, muab rau koj nrog kev daws teeb meem txhim khu kev qha rau kev ntsuas kub.

Xaus lus, thaum muaj ntau txoj hauv kev los txheeb xyuas cov xov hlau zoo thiab tsis zoo ntawm lub thermocouple, kev xaiv peb cov khoom siv thermocouple zoo ua rau cov txheej txheem yooj yim dua thiab ua kom muaj kev ntsuas kub kom raug thiab ruaj khov. Peb txoj kev cog lus rau qhov zoo thiab tus neeg siv-phooj ywg tsim ua rau peb yog qhov kev xaiv zoo tshaj plaws rau txhua yam koj xav tau thermocouple xov hlau.