Mineral-insulated (MI) thermocouples yog universally lees paub tias yog hom kev ntseeg siab tshaj plaws thiab ruaj khov rau cov kev siv kub khiav, thiab lawv qhov tseem ceeb hauv kev txhaj tshuaj molding stems los ntawm kev sib xyaw tshwj xeeb ntawm cov qauv tsim, kev ua haujlwm ntawm cov khoom, thiab ib puag ncig tiv thaiv uas tsis tuaj yeem sib phim los ntawm yas-insulated los yog fabricated thermocouples. Yuav kom nkag siab tias vim li cas MI thermocouples yog qhov tseem ceeb, nws yog ib qho tsim nyog los tshuaj xyuas lawv cov kev tsim kho sab hauv, xaiv cov khoom siv, thiab cov yam ntxwv ntawm kev ua tau zoo.
Ntawm nws cov tub ntxhais, MI thermocouple muaj peb yam tseem ceeb: seamless, kos hlau sab nrauv sheath, ob precision thermo-element alloy xov hlau (xws li Chromel thiab Alumel rau Hom K, feem ntau tshwm sim hauv cov kub khiav), thiab ib qho ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom magnesium oxide (MgO) cov tub ntxhais rwb thaiv tsev. Tsis zoo li cov yas-insulated thermocouples, uas siv cov organic lossis polymer-raws li cov ntaub ntawv uas soften, outgas, thiab degrade ntawm qhov kub thiab txias, MI thermocouples siv inorganic, ceramic-raws li MgO rwb thaiv tsev uas tseem ruaj khov thiab hluav taws xob insulating txawm tias kub tshaj 1000 degree. Lub MgO yog compacted nyob rau hauv siab heev thaum lub sij hawm tsim khoom, tshem tawm tag nrho cov pa pa, xauv cov hlau alloy nyob rau hauv qhov chaw, thiab tsim ib tug khoom, tshav kub-conductive qauv uas tso cai rau cov thermal teb ceev heev.
Qhov kev tsim kho ruaj khov no muab ntau yam kev hloov pauv rau kev ua haujlwm kub khiav. Ua ntej, nws tshem tawm cov dej noo ingress, ib qho ua rau tsis ua hauj lwm hauv cov yas-insulated sensors. MgO yog hygroscopic thiab yuav nqus dej noo yog tias raug, tab sis lub seamless hermetic sheath ntawm MI thermocouple tiv thaiv ambient humidity los ntawm ncav cuag lub hauv paus tseem ceeb. Qhov thib ob, tus qauv muab tshwj xeeb txhua yam muaj zog thiab yoog raws, tso cai rau cov thermocouple yuav tsum tau khoov, hla, thiab ntsia rau hauv qhov chaw nruj hauv cov nozzles thiab manifolds yam tsis muaj kev tawg lossis poob kev ua haujlwm. Thib peb, lub compacted MgO ua kom ceev ceev hloov ntawm lub plhaub mus rau qhov kev sib tshuam, ua rau lub sij hawm teb ntsuas nyob rau hauv milliseconds - tseem ceeb rau kev tuav ruaj khov nyob rau hauv siab - ceev molding cycles.
MI thermocouples kuj tiv thaiv thermal shock, kev co, thiab tshuaj lom neeg corrosion zoo dua li lwm cov qauv tsim. Lub seamless hlau sheath, feem ntau yog ua los ntawm 316L stainless hlau los yog Inconel 600 rau siab - kub daim ntaub ntawv, tsim ib tug muaj zog barrier tiv thaiv yas fumes, abrasive fillers, thiab corrosive additives xws li chlorine los yog fluorine pom nyob rau hauv tej yam polymers. Nyob rau hauv 24/7 siab- ntim ntau lawm ib puag ncig, qhov chaw thermocouples tau dhau ntau lab lub voj voog thermal, MI kev tsim kho tiv thaiv hlau qaug zog, sib cais sib cais, thiab sab hauv hlau txav uas ua rau cov teeb liab drift thiab tsis ua hauj lwm hauv qis dua - sensors zoo.
Yas-insulated thermocouples, los ntawm kev sib piv, yog tsis tsim nyog rau kev siv kub khiav. Lawv degrade sai ntawm qhov kub thiab txias, nqus dej noo, tsim hluav taws xob nrov, thiab muaj lub sijhawm teb qeeb. Rau cov molders nqis peev hauv kev txhim khu kev qha, qis- tu, ntev- lub neej kub khiav tshuab, MI thermocouples tsis yog qhov kev xaiv zoo tshaj -lawv yog qhov yuav tsum tau ua. Lawv cov qauv tsim ua kom muaj kev ruaj ntseg, qhov tseeb, thiab lub neej ntev nyob rau hauv cov kev ua haujlwm hnyav tshaj plaws, ua rau lawv cov qauv kev lag luam tsis muaj teeb meem.
