Txhawm rau sib txawv ntawm qhov yooj yim sojntsuam- hom platinum tiv thaiv ntsuas kub, yooj yim sojntsuam-hom thermocouples, thiab ruaj khov- flange mounted hlws ris lub thawv thermocouples, kev txheeb xyuas qhov systematic yuav tsum tau ua raws li plaub qhov ntev: txoj haujlwm ua haujlwm, cov yam ntxwv ntawm cov txheej txheem, txoj kev xaim, thiab daim ntawv teeb tsa. Qhov no tuaj yeem txiav txim siab tau los ntawm kev soj ntsuam lub cev thiab kev siv tshuab ib leeg, tsis tas yuav muaj cov ntxhuav.
Raws li txoj cai ntawm kev ua haujlwm, qhov yooj yim sojntsuam- hom platinum tiv thaiv tus pas ntsuas kub yog qhov tsis kam- hom sensor. Nws qhov kub thiab txias -sensing lub ntsiab yog siab -purity platinum hlau, uas nws kuj hloov linearly nrog kub. Nws yuav tsum muaj qhov chaw sab nraud qhov chaw tam sim no rau excitation kom tso tawm cov teeb liab ntsuas, ua rau nws ntsuas ntsuas kub tsis txaus. Ob hom thermocouples, txawm li cas los xij, yog ua raws li Seebeck effect, qhov twg microvolt -theem thermoelectric peev xwm yog tshwm sim los ntawm qhov kub thiab txias ntawm qhov sib txuas ntawm ob qhov sib txawv. Lawv tsis tas yuav muaj kev siv hluav taws xob sab nraud, ua rau lawv tus kheej ib txwm muaj - tsim cov sensors nrog cov teeb liab tawm ncaj qha thiab muaj zog tiv thaiv - muaj peev xwm cuam tshuam.
Qhov tseem ceeb tshaj plaws ntawm cov qauv sib txawv yog nyob rau hauv kev tiv thaiv txheej thiab mounting interface. Qhov kub thiab txias -sensing lub ntsiab ntawm platinum kuj tus pas ntsuas kub yog feem ntau encapsulated nyob rau hauv ib tug ceramic los yog iav insulating raj, tsis muaj hlau casing. Nws muaj ib rab koob, -zoo li cov duab, zoo li lub me me ceramic sojntsuam, haum rau huv si, vibration- ib puag ncig dawb. Qhov yooj yim sojntsuam-hom thermocouple siv cov hlau tiv thaiv sheath (xws li 304 stainless hlau lossis Inconel alloy) kom kaw tag nrho cov thermoelectrodes, tsim cov qauv hlau sojntsuam muaj zog nrog ob lub xov hlau txuas ncaj qha los ntawm qhov kawg. Qhov no yog tsim rau hnyav hnyav xws li kev vibration thiab siab siab. Thaum qhov ruaj khov-flange mounted junction box thermocouple kuj tseem siv lub raj hlau tiv thaiv, nws qhov tshwj xeeb tshaj plaws yog kev sib koom ua ke ntawm qhov tsis yog{11}} tshem tawm qhov flange interface kawg ntawm lub raj tiv thaiv. Qhov flange no feem ntau yog tus qauv DN25 lossis ANSI 150lb specification, ruaj ruaj rau cov yeeb nkab lossis khoom siv lub cev los ntawm vuam lossis bolts. Lub thawv sib txuas thiab flange yog sib xyaw ua ke, ua rau "pipe-flange-box" peb-hauv-ib qho qauv, tshwj xeeb tsim rau siab - siab, siab - kub, kev ua haujlwm tsis tu ncua kev lag luam uas nquag cuam tshuam rau phab ntsa, xws li cov khoom tawg, tsis sib xws. thiab chemical reactor lub cev.
Txoj kev xaim yog ib qho tseem ceeb rau kev ceev ntawm - kev txheeb xyuas qhov chaw. Platinum resistance thermometers feem ntau siv peb -xov los yog plaub- cov kab hluav taws xob los tshem tawm cov kev cuam tshuam ntawm cov hlau lead, nrog peb lossis plaub cov hlau lead uas muaj cov tuab tuab thiab meej meej xim -coded. Cov thermocouples yooj yim tsuas yog xav tau ob lub xov hlau, uas tau coj ncaj qha tawm ntawm qhov kawg ntawm cov hlau sheath, tsis muaj cov khoom siv txuas ntxiv. Thaum tsau flange thermocouples tseem siv ob lub xov hlau, cov xov hlau tsis ncaj qha coj tawm los ntawm kev sojntsuam, tab sis thawj zaug txuas nrog lub thawv sib txuas nrog lub flange, thiab tom qab ntawd coj tawm ntawm sab lossis hauv qab ntawm lub thawv sib txuas. Lub thawv sib txuas feem ntau yog ua los ntawm cam khwb cia txhuas lossis engineering yas, nrog IP65 lossis siab dua kev tiv thaiv kev ntsuas, thiab lub thawv thiab flange yog cov qauv sib cais tsis sib xws - qhov no yog qhov tseem ceeb ntawm nws lub npe thiab kev ua haujlwm.
Rau kev txheeb xyuas lub cev, cov hauv qab no "peb-point" tuaj yeem ua raws:
Saib cov ntaub ntawv casing: Tsis muaj hlau casing → platinum kuj tus pas ntsuas kub; hlau casing tsis flange → yooj yim thermocouple; hlau raj + welded flange → tsau flange thermocouple.
Saib ntawm txoj kev xaim: Peb lossis ntau cov xov hlau → platinum tiv thaiv tus pas ntsuas kub; ob lub xov hlau ncaj qha los ntawm kev sojntsuam → yooj yim thermocouple; ob lub xov hlau coj tawm los ntawm ib lub thawv rau sab ntawm lub flange ruaj khov → tsau flange thermocouple.
Saib ntawm daim ntawv teev npe: "Pt100" lossis "RTD" qhia lub ntsuas kub platinum tiv thaiv; "K-type," "J-type," lossis "T/C" qhia txog lub thermocouple; Yog hais tias "fixed flange," "DN25," "explosion-proof junction box," "IP65," thiab lwm yam, kuj muaj, nws yog ib tug ruaj flange mounted junction box hom thermocouple.
