Kuyeza kutentha ndi chimodzi mwazinthu zofunika kwambiri pakulamulira njira pakati pa mafakitale. Resistance Temperature Detector (RTD) ndi Thermocouple (TC) ndi awiri mwa masensa otentha omwe amagwiritsidwa ntchito kwambiri. Chilichonse chili ndi mfundo zake zogwirira ntchito, mulingo woyenera woyezera komanso mawonekedwe ake. Kumvetsetsa kwathunthu makhalidwe awo kumathandiza kuthetsa kukayikira ndikupanga chisankho chodziwikiratu pakuwongolera njira. Monga momwe wina angadzifunse momwe angasankhire cholowa m'malo pamene chipangizo cha RTD chamakono chikufunika kusinthidwa, kodi kukana kwina kwa kutentha kungakhale bwino kapena thermocouple ingakhale yabwinoko.
RTD (Chowunikira Kutentha kwa Resistance)
RTD imagwira ntchito potsatira mfundo yakuti kukana kwa magetsi kwa chitsulocho kumasintha ndi kutentha. Kawirikawiri imapangidwa kuchokera ku platinamu, RTD Pt100 imawonetsa ubale wodziwika bwino komanso wofanana pakati pa kukana ndi kutentha komwe 100Ω ikufanana ndi 0℃. Kutalika kwa kutentha kwa RTD kuli pafupifupi -200℃ ~ 850℃. Komabe, ngati mulingo woyezera uli mkati mwa 600℃ magwiridwe ake amatha kuwonjezeredwa.
Thermocouple
Thermocouple ndi chipangizo chomwe chimagwiritsidwa ntchito poyesa kutentha kudzera mu seebeck effect. Chili ndi zitsulo ziwiri zosiyana zomwe zimalumikizidwa kumapeto kulikonse. Voltage imapangidwa yomwe imagwirizana ndi kusiyana kwa kutentha pakati pa malo otenthetsera (kumene kuyeza kumatengedwa) ndi malo ozizira (osungidwa nthawi zonse ngati kutentha kotsika). Malinga ndi kuphatikiza kwa zinthu zomwe zimagwiritsidwa ntchito, thermocouple ikhoza kugawidwa m'magulu ambiri omwe amakhudza kutentha kwawo komanso kukhudzidwa kwawo. Mwachitsanzo, Type K (NiCr-NiSi) ndi yokwanira kugwiritsidwa ntchito mpaka pafupifupi 1200℃ pomwe Type S (Pt10%Rh-Pt) imatha kuyeza mpaka 1600℃.
Kuyerekeza
Mulingo woyezera:RTD imagwira ntchito bwino kwambiri pakati pa -200~600℃. Thermocouple ndi yoyenera kutentha kwambiri kuyambira 800~1800℃ kutengera ndi kutsiriza kwake, koma nthawi zambiri sikulimbikitsidwa kuti muyesedwe pansi pa 0℃.
Mtengo:Mitundu yodziwika bwino ya thermocouple nthawi zambiri imakhala yotsika mtengo kuposa RTD. Komabe, ma thermocouple apamwamba kwambiri opangidwa kuchokera ku zipangizo zamtengo wapatali akhoza kukhala okwera mtengo, ndipo mtengo wake ukhoza kusinthasintha malinga ndi msika wa zitsulo zamtengo wapatali.
Kulondola:RTD imadziwika kuti ndi yolondola kwambiri komanso yobwerezabwereza, zomwe zimapangitsa kuti kutentha kuwerengedwe bwino kuti kukhale koyenera kuwongolera kutentha komwe kumafuna kugwiritsa ntchito. Thermocouple nthawi zambiri si yolondola kwambiri kuposa RTD ndipo si yaluso kwambiri pa kutentha kochepa (<300℃). Kumaliza maphunziro a sekondale kukanapangitsa kuti kulondola kukhale kwabwino.
Nthawi Yoyankha:Thermocouple ili ndi nthawi yoyankha mwachangu poyerekeza ndi RTD, zomwe zimapangitsa kuti ikhale yolimba kwambiri mu ntchito yosinthasintha komwe kutentha kumasintha mofulumira.
Zotsatira:Mphamvu yolimbana ndi RTD nthawi zambiri imagwira ntchito bwino pa kukhazikika kwa nthawi yayitali komanso kulumikizana bwino kuposa chizindikiro chamagetsi cha thermocouple. Zotuluka zamitundu yonse iwiri ya sensor ya kutentha zimatha kusinthidwa kukhala chizindikiro chamagetsi cha 4 ~ 20mA komanso kulumikizana mwanzeru.
Kuchokera pa zomwe zili pamwambapa, tinganene kuti chinthu chofunikira kwambiri pakusankha pakati pa RTD ndi thermocouple ndi kutalika kwa kutentha komwe kumayenera kuyezedwa. RTD ndiye sensa yabwino kwambiri pa kutentha kwapakati chifukwa cha magwiridwe ake abwino, pomwe thermocouple imatha kutentha kwambiri kuposa 800℃. Kubwerera ku nkhaniyi, pokhapokha ngati pali kusintha kapena kupotoka kwa kutentha kogwirira ntchito, kusintha kwa thermocouple sikungakhale ndi phindu lalikulu kapena kusintha kuchokera ku ntchito yoyambirira ya RTD. Khalani omasuka kulumikizana nafe.Shanghai Wangyuanngati pali nkhawa ina iliyonse kapena kufunika kokhudzana ndi RTD ndi TR.
Nthawi yotumizira: Disembala-30-2024