Lub thermocouple yog tsim los ntawm ntau yam khoom. Ntawm no yog ib qho kev tawg ntawm txhua daim.
Kev ntsuas Junctions
Ib qho kev ntsuas ntsuas yog qhov "kub" kawg ntawm lub thermocouple. Qhov kev sib tshuam no yog qhov twg ob lub xov hlau sib ntsib, thiab qhov ntsuas kub qhov twg. Muaj peb hom kev ntsuas junctions:
Exposed Junction- Tsis muaj dab tsi tiv thaiv cov hlau xaus, txhais tau tias lawv tuaj yeem xeb lossis puas thaum lub sijhawm.
Grounded Junction- Lub Hlau Sheath Npog Cov Hlau (feem ntau stainless hlau). Qhov kev tsim no muaj ntau ruaj khov thiab kav ntev.
Ungrounded Junction- Hauv qhov no, lub plhaub tsis txuas hluav taws xob rau cov hlau. Ib qho kev tsis sib haum xeeb tsis tshua muaj kev cuam tshuam rau electromagnetic cuam tshuam.
Reference Junctions
Qhov kev sib txuas siv yog lwm sab ntawm lub thermocouple, lossis qhov "txias" kev sib txuas. Txhawm rau kom tau txais cov ntawv nyeem kom raug thermocouple, koj yuav tsum paub cov xov hlau 'qhov kub thiab txias ntawm so-li no lo lus "siv." Cov kev siv junction feem ntau ua rau hauv cov khoom ntsuas, yog li tus neeg siv yuav tsis pom nws.
Extension Hlau
Txij li cov thermocouples feem ntau muab tso rau hauv cov xwm txheej tsis haum rau tib neeg, xws li huab cua txias lossis cua sov, tus nyeem ntawv kub feem ntau tau muab tso rau qhov deb ntawm qhov ntsuas qhov sib txuas. Txhawm rau kom ntseeg tau qhov tseeb ntawm kev nyeem ntawv, cov tshuab no siv cov xov hlau txuas ntxiv. Cov xov hlau no yog insulated thiab tiv thaiv kom cov voltage tsis cuam tshuam los ntawm lwm yam ib puag ncig. Cov xov hlau tsis tau calibrated saum 204 degree kom ruaj ntseg.
