Txhawm rau paub qhov txawv ntawm qhov yooj yim sojntsuam- hom platinum tiv thaiv ntsuas kub, yooj yim sojntsuam- hom thermocouples, thiab tsis yog-hlau tiv thaiv lub raj hlws ris lub thawv hom thermocouples, tus yuam sij yog qhov pom kev pom lawv raws li plaub qhov ntev: cov qauv kev ua haujlwm, cov yam ntxwv ntawm cov qauv, txoj kev xaim, thiab cov cim pom. Qhov no tso cai rau kev qhia meej meej yam tsis muaj kev cia siab rau cov rooj.
Raws li txoj cai ntawm kev ua haujlwm, yooj yim sojntsuam- hom platinum tiv thaiv tus pas ntsuas kub yog raws li cov yam ntxwv uas cov hlau tsis kam hloov nrog qhov kub thiab txias, thiab yuav tsum muaj qhov chaw sab nraud tam sim no los ntsuas qhov kev hloov pauv, ua rau lawv cov sensors passive; ob hom thermocouples yog ua raws li Seebeck nyhuv, qhov twg microvolt - theem voltage yog spontaneously generated los ntawm qhov kub thiab txias sib txawv ntawm qhov sib txuas ntawm ob hlau sib txawv, tsis tas yuav tsum muaj lwm lub hwj chim, ua rau lawv tus kheej - tsim sensors.
Qhov tseem ceeb tshaj plaws ntawm cov qauv sib txawv yog nyob rau hauv cov txheej txheem tiv thaiv cov khoom thiab cov ntawv ntim. Lub ntsiab lus ntawm lub platinum tiv thaiv tus pas ntsuas kub yog feem ntau encapsulated nyob rau hauv ceramic los yog iav casing, kiag li tsis muaj hlau sheath, tshwm raws li ib tug slender "ceramic koob"; yooj yim sojntsuam-hom thermocouples yog encased nyob rau hauv ib tug hlau tiv thaiv sheath, xws li stainless hlau los yog Inconel, tshwm raws li ib tug hlau sojntsuam; tsis yog-hlau tiv thaiv lub raj txuas lub thawv hom thermocouples siv tsis yog- cov khoom siv hlau xws li ceramic, quartz, lossis PTFE ua lub raj tiv thaiv, thiab lawv qhov tshwj xeeb tshaj plaws yog kev sib txuas ntawm lub thawv sib txuas sab nraud ntawm qhov kawg ntawm kev sojntsuam. Lub thawv sib txuas no feem ntau yog ua los ntawm cov yas lossis hlau thiab siv los tiv thaiv thiab txuas cov xov hlau thermocouple.
Txoj kev xaim yog lub hauv paus tseem ceeb rau kev ceev ntawm - kev txheeb xyuas qhov chaw. Platinum tiv thaiv tus pas ntsuas kub feem ntau siv ob- hlau, peb- hlau, lossis plaub- cov kab hluav taws xob, nrog peb lossis plaub cov hlau lead los tshem tawm cov kev cuam tshuam ntawm cov xaim; Cov thermocouples yooj yim tsuas muaj ob lub xov hlau, ncaj qha tawm ntawm qhov kawg ntawm cov hlau sheath, tsis muaj cov khoom siv txuas ntxiv; tsis yog-hlau tiv thaiv tube thermocouples kuj muaj ob lub xov hlau, tab sis cov xov hlau tsis ncaj qha coj tawm los ntawm kev sojntsuam, tab sis thawj zaug txuas rau lub thawv sib txuas, thiab tom qab ntawd coj tawm ntawm lub thawv sib txuas, uas yog cov yam ntxwv tseem ceeb ntawm nws lub npe.
Thaum txheeb xyuas cov cuab yeej no pom qhov muag, cov hauv qab no "peb-taw tes" txoj cai tuaj yeem ua raws:
1. Saib xyuas cov khoom siv casing: Tsis muaj hlau casing → Platinum resistance thermometer; Hlau casing → Yooj yim thermocouple; Ceramic/white non-metallic tube + side box → Non-metallic protective tube thermocouple.
2. Saib xyuas tus naj npawb thiab txoj hauv kev ntawm cov xov hlau: Peb lossis ntau cov xov hlau → Platinum kuj ntsuas kub; Ob lub xov hlau ncaj qha los ntawm kev sojntsuam → Yooj yim thermocouple; Ob lub xov hlau coj los ntawm ib lub thawv cais → Tsis yog-cov hlau tiv thaiv lub raj thermocouple.
3. Saib xyuas cov ntawv cim npe: cim "Pt100" lossis "RTD" qhia tias platinum tiv thaiv tus pas ntsuas kub; Cim "Type K," "Type J," lossis "T/C" qhia tias muaj lub thermocouple; Yog hais tias "ceramic tube," "junction box," los yog "explosion-proof" kuj muaj, nws yog ib qho uas tsis yog -hlau tiv thaiv raj hlws ris lub thawv hom thermocouple.
Tsis tas li ntawd, cov thermocouples uas tsis yog -hlau tiv thaiv lub raj thermocouples yog tsim los rau cov corrosive siab, siab -purity, los yog nruj nreem insulated ib puag ncig, xws li tshuaj reactors, khoom noj khoom haus thiab tshuaj ntau lawm kab, thiab kua qaub thiab alkali pipelines. Lawv cov hlau tsis yog- cov raj hlau tuaj yeem tiv taus cov kua qaub, cov hauv paus muaj zog, thiab cov kuab tshuaj organic, thaum cov hlau- sheathed thermocouples thiab platinum tiv thaiv tus pas ntsuas kub tau yooj yim corroded thiab tsis nyob rau hauv ib puag ncig zoo li no.
Cov yam ntxwv sib xyaw ua ke no tsim ib qho kev qhia tsis meej, tso cai rau kev txheeb xyuas qhov tseeb yam tsis muaj kev cia siab rau cov ntxhuav, tsuas yog los ntawm kev tshuaj xyuas qhov muag, kev soj ntsuam xov tooj, thiab cov ntaub ntawv npe.
