Kuyeza kutentha ndi chimodzi mwazinthu zofunika kwambiri pakuwongolera machitidwe pakati pa mafakitale. Resistance Temperature Detector (RTD) ndi Thermocouple (TC) ndi awiri mwa masensa omwe amagwiritsidwa ntchito kwambiri. Iliyonse yaiwo ili ndi mfundo yakeyake yogwiritsira ntchito, miyeso yoyezera ndi mawonekedwe ake. Kumvetsetsa bwino za machitidwe awo kumathandizira kuthetsa kukayikira ndikupanga chisankho choyenera pa kayendetsedwe ka kayendetsedwe kake. Monga wina angadabwe momwe angasankhire choloweza m'malo pomwe chipangizo cha RTD chamakono chikufunika kusinthidwa, kukana kwina kwamafuta kungakhale bwino kapena thermocouple ingakhale yabwinoko.
RTD (Resistance Temperature Detector)
RTD imagwira ntchito pa mfundo yakuti kukana kwamagetsi kwa zinthu zachitsulo kumasintha ndi kutentha. Amapangidwa kuchokera ku platinamu, RTD Pt100 imawonetsa ubale wodziwikiratu komanso pafupifupi mzere pakati pa kukana ndi kutentha komwe 100Ω imafanana ndi 0℃. Kugwiritsa ntchito kutentha kwa RTD ndi kuzungulira -200 ℃ ~ 850 ℃. Komabe, ngati kuyeza kugwera mkati mwa 600 ℃ magwiridwe ake amatha kuwongoleranso.
Thermocouple
Thermocouple ndi chipangizo chomwe chimagwiritsidwa ntchito kuyeza kutentha pogwiritsa ntchito seebeck effect. Zimakhala ndi zitsulo ziwiri zosiyana zolumikizidwa kumapeto kulikonse. Mphamvu yamagetsi imapangidwa yomwe imagwirizana ndi kusiyana kwa kutentha pakati pa mphambano yotenthetsera (pomwe muyeso umatengedwa) ndi malo ozizira (osungidwa nthawi zonse ngati kutentha kochepa). Malinga ndi kuphatikiza kwa zinthu zomwe zimagwiritsidwa ntchito, thermocouple imatha kugawidwa m'magulu ambiri omwe amakhudza kutentha kwawo komanso kukhudzidwa kwawo. Mwachitsanzo, Type K (NiCr-NiSi) ndi yokwanira kugwiritsa ntchito mpaka pafupifupi 1200 ℃ pomwe Type S (Pt10%Rh-Pt) imatha kuyeza mpaka 1600 ℃.
Kuyerekezera
Mlingo woyezera:RTD imagwira ntchito kwambiri pakati pa -200 ~ 600 ℃. Thermocouple ndi yoyenera kutentha kwapamwamba kwambiri kuchokera ku 800 ~ 1800 ℃ kutengera ndi maphunziro, komabe sikumalangizidwa kuti muyesedwe pansi pa 0 ℃.
Mtengo:Mitundu yodziwika bwino ya thermocouple nthawi zambiri imakhala yotsika mtengo kuposa RTD. Komabe, maphunziro apamwamba a thermocouple opangidwa kuchokera ku zinthu zamtengo wapatali akhoza kukhala okwera mtengo, ndipo mtengo wake ukhoza kusinthasintha ndi msika wamtengo wapatali wazitsulo.
Kulondola:RTD imadziwika kuti ndi yolondola kwambiri komanso yobwerezabwereza, yopereka mawerengedwe olondola a kutentha kwa kutentha kwamphamvu komwe kumafunikira ntchito. Thermocouple nthawi zambiri si yolondola kwambiri kuposa RTD ndipo sadziwa kwambiri kutentha kwapakati (＜300 ℃). Omaliza maphunziro apamwamba akanatha kuwongolera bwino.
Nthawi Yoyankha:Thermocouple ili ndi nthawi yoyankha mwachangu poyerekeza ndi RTD, ndikupangitsa kuti ikhale yolimba kwambiri pamachitidwe osinthika pomwe kutentha kumasintha mwachangu.
Zotulutsa:Kukaniza kwa RTD nthawi zambiri kumawonetsa kuchita bwino pakukhazikika kwanthawi yayitali komanso mzere kuposa siginecha yamagetsi ya thermocouple. Zotulutsa zamitundu yonse ya sensor ya kutentha zitha kusinthidwa kukhala 4 ~ 20mA siginecha yamakono komanso kulumikizana kwanzeru.
Kuchokera pazidziwitso zomwe zili pamwambazi tingathe kunena kuti chosankha chosankha pakati pa RTD ndi thermocouple ndi kutalika kwa kutentha komwe kumayenera kuyezedwa. RTD ndiye kachipangizo kakang'ono ka kutentha kwapakati-pakatikati chifukwa cha magwiridwe ake apamwamba, pomwe thermocouple imatha kutentha kwambiri kuposa 800 ℃. Kubwerera ku mutu, pokhapokha ngati pali kusintha kapena kupotoza kutentha kwa ntchito, kusintha kwa thermocouple sikungatheke kubweretsa phindu lalikulu kapena kusintha kuchokera ku chochitika choyambirira cha RTD. Khalani omasuka kulumikizanaShanghai Wangyuanngati pali nkhawa ina iliyonse kapena kufunikira kokhudza RTD & TR.
Nthawi yotumiza: Dec-30-2024