Kev sib txuas hluav taws xob tsis ua haujlwm suav nrog feem pua ntawm cov cua sov ua haujlwm poob qis, tab sis kev xaiv cov hlau lead feem ntau tau txais kev saib xyuas engineering tsawg dua li cov cua sov nws tus kheej. Standard fiberglass-insulated leads txaus rau ambient kub ib puag ncig sai degrade thaum raug tshav kub, tshuaj, thiab mechanical stresses ib yam ntawm industrial processing khoom. Xaiv qhov tsim nyog cov hlau lead hlau teeb tsa rau ib puag ncig tshwj xeeb tiv thaiv qhov cuam tshuam ntawm hluav taws xob cuam tshuam uas ua rau muaj qhov tsis zoo ntawm qhov kub thiab txias thiab tsis tau npaj tseg.
High - cov ntawv thov kub tam sim ntawd tawm tsam cov khoom siv hluav taws xob zoo li qub. Standard PVC rwb thaiv tsev tsis nyob rau ntawm qhov kub siab tshaj 105 degree, txawm tias silicone roj hmab degrades saum 200 degree. Cartridge heaters ua hauj lwm nyob ze lawv qhov siab tshaj plaws sheath kub yuav tsum tau ua nrog rwb thaiv tsev ntsuas rau tsawg kawg yog 250 degree, feem ntau yog siv fiberglass braiding los yog ntxhia rwb thaiv tsev. Cov kev kub siab no - kub ua rau kev lag luam yooj yim rau thermal stability, yuav tsum tau ua tib zoo taug kev los tiv thaiv kev qaug zog los ntawm kev co lossis thermal expansion txav.
Raws li kev paub dhau los ntawm cov hlau casting thiab cua sov-kev ua haujlwm kho mob, qhov hloov pauv ntawm lub tshuab rhaub cua sov thiab cov hlau lead yog qhov tseem ceeb heev. Qhov kev sib tshuam no tau ntsib qhov siab tshaj plaws thermal gradient nyob rau hauv tag nrho lub rooj sib txoos, nrog rau cov ntaub ntawv uas muaj peev xwm ncav cuag 700℃thaum cov hlau lead yuav tsum nyob twj ywm txias txaus los tiv thaiv kev ruaj ntseg ntawm rwb thaiv tsev. Cov cua sov tsim kom raug suav nrog cov kev hloov pauv hloov maj mam thiab cov cua sov-ntxuav cov yam ntxwv uas txuas cov thermal gradient tshaj li ob peb centimeters ntau dua li tsis xav kom muaj kev ntxhov siab ntawm ib qho chaw.
Qhov tseeb, qhov sib piv ntawm cov txheej txheem tiv thaiv cov hlau lead sib txawv qhia pom kev lag luam tseem ceeb -offs rau cov ntawv thov tshwj xeeb. Flexible hlau conduit muab kev tiv thaiv zoo heev tiv thaiv kev puas tsuaj thiab kev sib tsoo tab sis ua kom sov rov qab mus rau qhov chaw sib txuas, uas ua rau muaj kev cuam tshuam ntxov ntxov. Rigid conduit systems cais cov cua sov zoo dua tab sis nyuaj rau kev teeb tsa thiab txwv kev hloov pauv yooj yim. Hauv cov ntawv thov uas muaj qhov kub thiab txias, silicone- lub tes tsho fiberglass impregnated muaj qhov sib npaug ntawm kev tiv thaiv thermal thiab installation yooj yim, txawm hais tias nws muab kev tiv thaiv tsawg dua li cov hlau xaiv.
Kev raug tshuaj lom neeg ua rau muaj teeb meem ntxiv dua li kev xav txog kev siv thermal. Cov khoom siv ua zaub mov yuav tsum muaj cov khoom siv lead ua uas tiv taus cov txheej txheem ntxuav kom huv uas siv cov tshuaj detergents thiab tshuaj tua kab mob. Roj- puv tshuab nthuav qhia kev sib tw nrog cov txheej txheem rwb thaiv tsev cov ntaub ntawv uas degrade thaum raug hydrocarbons. Rau cov cheeb tsam no, Teflon-coated leads lossis stainless hlau armored cables tswj hluav taws xob kev ncaj ncees thaum tiv thaiv tshuaj tua kab mob uas yuav ua kom puas cov pa hluav taws xob rwb thaiv tsev.
Kev tiv thaiv hluav taws xob tsis muaj suab nrov dhau los ua qhov tseem ceeb thaum lub tshuab hluav taws xob muaj xws li cov thermocouples sib xyaw rau kev tawm tswv yim kub. Fais fab coj mus nqa cov tam sim no siab tsim hluav taws xob electromagnetic teb uas induce suab nrov voltages nyob ze thermocouple conductors. Sib cais cov kab hluav taws xob los ntawm lub cev nyob deb lossis siv cov kab thaiv thermocouple tiv thaiv kev cuam tshuam ntawm lub cev. Kev coj ua hauv av kuj tseem cuam tshuam rau kev tiv thaiv suab nrov, nrog cov ntaub thaiv npog kom zoo ntawm ib qho ntsiab lus tiv thaiv hauv av voj voog tam sim no uas ua rau qhov ntsuas kub tsis zoo.
Mechanical strain nyem ntawm cov hlau lead tawm cov ntsiab lus tiv thaiv tus neeg xyuas pib qaug zog los ntawm kev vibration thiab thermal cycling. Ntau lub tshuab rhaub dej kub tsis ua haujlwm tshwm sim raws li qhib circuits tshwm sim los ntawm cov hlau tawg ntawm lub tshuab rhaub lub cev sib txuas es tsis yog cua sov coil tsis ua haujlwm. Cov khoom siv kho mob kom zoo faib cov kev ntxhov siab ntawm cov neeg kho tshuab ntau dua li ob peb centimeters ntawm cov hlau lead ntev es tsis yog tsom rau ntawm ib qho taw tes. Nyob rau hauv siab -kev co ib puag ncig zoo li yas ua tshuab, ntxiv kev txhawb nqa clamps tiv thaiv cov hlau lead txav uas yuav ua rau tus neeg xyuas pib ua tsis tiav.
Kev xaiv lub davhlau ya nyob twg txuas cuam tshuam rau lub sijhawm ntev - kev ntseeg tau zoo heev. Ntsia hlau terminals loosen nyob rau hauv thermal cycling vibration, tsim siab -kuj kev sib txuas uas overheat thiab oxidize. Crimped kev twb kev txuas los yog welded terminals muab kev ruaj ntseg ntev dua - lub sij hawm kev ua tau zoo, tshwj xeeb tshaj yog nyob rau hauv daim ntawv thov nrog dav kub swings. Rau cov khoom siv thermocouple, cov thermocouple tshwj xeeb- cov khoom sib txuas muaj qhov sib kis ntawm qhov kub thiab txias thaum cov khoom siv hluav taws xob sib txuas qhia txog kev sib txuas tsis raug uas cuam tshuam kev nyeem ntawv.
Kev ua tiav cov hlau lead ua tiav yuav tsum muaj kev tsim qauv tsim los txiav txim siab txog hluav taws xob, thermal, tshuaj, thiab cov khoom siv tshuab ib txhij. Optimizing ib qho tseem ceeb thaum tsis quav ntsej lwm tus ua rau muaj qhov tsis zoo uas tshwm sim raws li kev ua tsis tiav. Kev tshaj lij cua sov qhov tshwj xeeb hais txog cov kev sib cuam tshuam no los teeb tsa cov hlau lead hlau sib dhos uas phim cov kev cia siab ntawm kev cia siab ntawm cov cua sov nws tus kheej.
