Kev ntsuas kub rau thermocouples

Thermocouple txias hlws ris kub, tseem hu ua txias junction reference kub, txias hlws ris kub, los yog siv kub. Raws li cov thermocouple nws tus kheej, nws yog ib qho khoom siv uas teb rau qhov sib txawv ntawm qhov kub thiab txias, thiab nws cov nqi millivolt tsuas yog cuam tshuam rau qhov kub thiab txias qhov sib txawv ntawm qhov kub thiab txias. Yog tias ib qho kawg yog 100 degree thiab lwm qhov kawg yog 20 degree, ces tus nqi millivolt tsim los ntawm thermocouple nws tus kheej tsuas yog sib npaug rau 80 degree. Thaum siv rau kev ntsuas kub, xws li ntsuas qhov khoom ntawm 100 degree hauv ib puag ncig ntawm 20 degree, thiab tau txais ib millivolt tus nqi sib raug rau 80 degree, qhov ntsuas kub ntawm cov khoom ntsuas tuaj yeem tau los ntawm kev ntxiv 20 degree ntawm ib puag ncig. Qhov no 20 degree (ambient kub) yog qhov siv kub rau qhov txias kawg. Feem ntau ntawm qhov ntsuas kub ntawm qhov chaw tuaj yeem pom qhov txias txias kawg, thiab cia li ntxiv nws, uas yog hu ua tsis siv neeg txias kawg them nyiaj. Tab sis nws yuav rov ua dua thaum kuaj xyuas lub moos, yog li tsis siv neeg txias kawg them nyiaj yuav tsum raug kaw lossis kho manually thaum kuaj xyuas lub moos.
Lub peev xwm ntawm lub tshuab hluav taws xob ntawm lub thermocouple yog cuam tshuam nrog cov khoom siv ntawm cov khoom siv hluav taws xob thiab qhov kub ntawm ob qhov kev sib cuag. Lub division table ntawm thermocouples thiab ntsuas kub ntsuas ntsuas raws li lub division table yog ob qho tib si raws li cov xwm txheej uas qhov ntsuas kub ntawm qhov kawg ntawm cov thermocouple yog sib npaug rau {{0}}} degree, yog li peb yuav tsum ua raws li qhov xwm txheej no thaum siv lawv. Yog hais tias qhov ntsuas kub tn tsis sib npaug rau 0 degree, txawm hais tias qhov ntsuas kub t tseem nyob tas li, qhov ntsuas kub ntawm E (t, tn) kuj tseem yuav hloov nrog qhov hloov pauv ntawm qhov ntsuas kub tn.
Piv txwv li, peb ntxig nickel chromium nickel silicon thermocouple rau hauv 600 degree tubular hluav taws xob rauv, thaum qhov ntsuas kub ntawm lub thermocouple yog 0 degree ; Nws cov khoom siv hluav taws xob muaj peev xwm yog 24.91 millivolts; Yog hais tias qhov ntsuas kub yog 30 degree, cov khoom siv hluav taws xob muaj peev xwm tso tawm los ntawm cov thermocouple poob rau 23.74 millivolts, uas yog qhov kev ntsuas yuam kev qhia thaum qhov ntsuas kub tsis sib npaug rau 0 degree. Yog hais tias qhov ntsuas kub hloov pauv, qhov kev ntsuas ntsuas qhov yuam kev yuav yog qhov sib txawv. Nws tuaj yeem pom tias thaum qhov ntsuas qhov ntsuas kub tsis sib npaug li 0 degree, nws muaj qhov cuam tshuam tseem ceeb rau qhov tseeb ntawm qhov ntsuas kub.
Thaum siv cov thermocouples rau kev ntsuas qhov kub thiab txias, nws yog ib qho nyuaj rau kev tswj xyuas qhov ntsuas kub ntawm 0 degree, thiab feem ntau tsuas yog tsim nyog rau kev ntsuas qhov tseeb hauv chav kuaj. Hauv kev ntsuas hluav taws xob dav dav, qhov ntsuas kub siv feem ntau yog nyob rau hauv chav tsev kub lossis kub hloov pauv ntau yam. Hauv qhov no, txhawm rau ntsuas qhov ntsuas kub tiag tiag, kev ntsuas xws li kev kho lossis kev them nyiaj yuav tsum tau ua.