Dab tsi yog vim li cas rau kev siv thermocouples tsis tsim nyog?

Thermocouples tuaj yeem ntsuas qhov ntsuas kub thiab txias thiab hloov cov teeb liab thermoelectric muaj peev xwm hloov mus rau qhov kub ntawm ntsuas nruab nrab. Thermocouples feem ntau siv los ntawm qhov ntsuas kub ntsuas ntsuas kub, yog li qhov tseeb siv ntawm thermocouples yog qhov tseem ceeb heev, vim tias nws cuam tshuam cov kev hloov pauv ntawm qhov ntsuas kub. Qhov tshwm sim ntawm unqualified thermocouples thaum lub sij hawm yog feem ntau tshwm sim los ntawm cov cawv ntawm heterogeneous thermocouple thermocouples, thiab kev siv thermocoup me me, thiab kev siv thermocoed ntawm thermocouples;
1. Tus Cuam Tshuam Ntawm Thermocouple Hlau Heterogeneity

① Cov khoom siv thermocouple nws tus kheej yog heterogeneous. Thaum thermocouples yog ntsuas nyob rau hauv chav nruab metrology, lawv yuav tsum tso rau hauv Thermocouple Calibration rauv ntawm qhov tob ntawm 300mm raws li cov cai. Yog li ntawd, qhov kev ntsuas hluav taws xob tau tshwm sim ntawm txhua qhov thermocouple tsuas yog muaj kev cuam tshuam ntawm thermoelectric kev coj cwj pwm ntawm ib 300mm ntev thermocouple xaim los ntawm ntsuas ntsuas kom kawg. Txawm li cas los xij, thaum lub sijhawm ntev ntawm thermocouple yog ntev thiab feem ntau ntawm cov xov xwm thermocouple yog nyob rau hauv ib puag ncig nrog kub gradients, lawv yuav tsim thermoelectric muaj peev xwm nyob hauv zos. Lub zog hluav taws xob yog hu ua parasitic muaj peev xwm, thiab qhov yuam kev tshwm sim los ntawm parasitic lub peev xwm yog hu ua homogenization yuam kev.

Heterogeneity tsim los ntawm kev siv cov xov thermocrouple. Rau tshiab khiv tsim cov thermocooldles tshiab, txawm tias lub heterogeneous ua tau raws li qhov yuav tsum tau ua, kev ua dua tshiab tuaj yeem ua rau kev ua kom zoo thiab ploj ntawm homogeneity. Ib qho ntxiv, thermoounce uas tau raug rau lub sijhawm ntev ntev rau kev siv ntau thaum lub sijhawm siv kuj tseem tuaj yeem ua rau hloov pauv ntawm cov hlau tsis muaj kev cuam tshuam. Thaum cov pej xeem nyob hauv thaj chaw uas muaj qhov nyob nrog qhov ntsuas kub, Parasitic muaj peev xwm tseem yuav tsim thiab ntxiv rau tag nrho cov peev xwm thermoelectric, uas ua rau kev ntsuas tsis yog.

2. Lub shunt yuam kev ntawm cov thermored thermocouples

Thaum ntsuas cov cua sov sov nrog cua thermocotre, yog tias qhov kub nyob hauv nruab nrab ntawm thermocouple, uas yog hu ua shunt yuam kev. Vim yog cov ntaub ntawv rwb thaiv tsev ntawm lub caj dab thermocoupluple hmoov oxide, nws rwb thaiv tsev tsis kam lees rau txhua 100 degree nce hauv qhov kub ntawm qhov kub thiab txias thaum kub. Thaum qhov kub nyob hauv nruab nrab yog qhov siab, yuav muaj kev to taub hau tam sim no, ua rau muaj kev tawm tsam ntawm cov zis muaj peev xwm ntawm thermocouple.

3. Kev ntsuas tsis raug tshwm sim los ntawm kev siv tsis raug

Ib qho thermocouple uas tau txheeb xyuas qhov tsim nyog, yog siv tsis raug, tuaj yeem ua rau kev ntsuas tsis muaj qhov tsis muaj tseeb.

① cov ntxig tob ntawm qhov thermocouple tsis txaus, ua rau muaj kev ntsuas kub tsawg vim yog thermal cermality poob;

② Kev tuav tsis raug ntawm kev siv kub, xws li nplaim taws txau los ntawm cov cua sov ua rau cov neeg siv hluav taws xob ua kom muaj zog heev, tseem tuaj yeem ua rau ntsuas qhov yuam kev.