Ma'aunin zafi yana ɗaya daga cikin mahimman abubuwan da ke cikin sarrafa tsari tsakanin masana'antu. Resistance Temperature Detector (RTD) da Thermocouple (TC) biyu ne daga cikin firikwensin zafin jiki da aka fi amfani da su. Kowannen su yana da nasa ƙa'idar aiki, ma'auni mai dacewa da fasali. Cikakken fahimtar halayen su yana ba da gudummawa don kawar da shakku da yanke shawarar da aka sani game da sarrafa tsari. Kamar mutum na iya yin mamakin yadda za a zaɓi madadin lokacin da na'urar RTD ta yanzu ke buƙatar sauyawa, wani juriya na thermal zai yi kyau ko thermocouple zai fi kyau.
RTD (Mai Neman Zazzabi)
RTD yana aiki akan ƙa'idar cewa juriya na lantarki na kayan ƙarfe yana canzawa tare da zafin jiki. Yawanci da aka yi daga platinum, RTD Pt100 yana nuna alaƙar tsinkaya kuma kusan kusanci tsakanin juriya da zafin jiki inda 100Ω yayi daidai da 0℃. Matsakaicin zafin jiki na RTD yana kusa da -200 ℃ ~ 850 ℃. Duk da haka, idan ma'aunin aunawa ya faɗi cikin 600 ℃ aikinsa na iya ƙara haɓakawa.
Thermocouple
Thermocouple na'ura ce da ake amfani da ita don auna zafin jiki ta hanyar tasirin seebeck. Ya ƙunshi ƙananan ƙarfe guda biyu waɗanda aka haɗa a kowane ƙarshen. Ana samar da wutar lantarki wanda yayi daidai da bambancin zafin jiki tsakanin mahaɗar zafi (inda ake ɗaukar ma'auni) da mahaɗin sanyi (a koyaushe ana kiyaye shi azaman ƙananan zafin jiki). Dangane da haɗin kayan da aka yi amfani da su, ana iya raba thermocouple zuwa nau'ikan nau'ikan da yawa waɗanda ke shafar kewayon zafin su da hankali. Misali, Nau'in K (NiCr-NiSi) ya isa don aikace-aikacen har zuwa kusan 1200 ℃ yayin da Nau'in S (Pt10% Rh-Pt) yana iya aunawa har zuwa 1600 ℃.
Kwatanta
Ma'auni:RTD galibi yana tasiri tsakanin tazarar -200 ~ 600 ℃. Thermocouple dace da babba matsananci zazzabi daga 800 ~ 1800 ℃ dangane da digiri, duk da haka shi ne ba kullum bayar da shawarar ga auna kasa 0 ℃.
Farashin:Nau'o'in thermocouple na yau da kullun ba su da tsada fiye da RTD. Koyaya, babban digiri na digiri na thermocouple da aka yi daga abubuwa masu tamani na iya yin tsada, kuma farashin sa na iya canzawa da kasuwar ƙarfe mai daraja.
Daidaito:An san RTD babban daidaito da maimaitawa, yana ba da madaidaicin karatun zafin jiki don sarrafa zafin jiki mai ƙarfi da ke buƙatar aikace-aikace. Thermocouple gabaɗaya bai cika daidai ba fiye da RTD kuma bai ƙware sosai a cikin ƙarancin zafin jiki ba (℃ 300 ℃). Manyan kammala karatun digiri sun inganta daidaito.
Lokacin Amsa:Thermocouple yana da saurin amsawa idan aka kwatanta da RTD, yana mai da shi ƙarin juriya a aikace-aikacen tsari mai ƙarfi inda zafin jiki ke canzawa cikin sauri.
Fitowa:Fitinar juriya na RTD yawanci yana nuna kyakkyawan aiki akan kwanciyar hankali na dogon lokaci da layi fiye da siginar wutar lantarki na thermocouple. Ana iya canza abubuwan da ake samu na nau'ikan firikwensin zafin jiki zuwa 4 ~ 20mA siginar halin yanzu da sadarwa mai kaifin baki.
Daga bayanan da ke sama za mu iya ƙarasa da cewa ƙaƙƙarfan dalili don zaɓi tsakanin RTD da thermocouple shine iyakar zafin aiki da za a auna. RTD shine firikwensin firikwensin a cikin kewayon zafin jiki mai ƙarancin matsakaici don kyakkyawan aikinsa, yayin da thermocouple ya fi dacewa a ƙarƙashin yanayin zafi sama da 800 ℃. Komawa ga batun, sai dai idan an sami gyare-gyare ko karkata a cikin yanayin aiki, maye gurbin thermocouple ba zai iya haifar da fa'ida ko haɓakawa daga ainihin lokacin aikace-aikacen RTD ba. Jin kyauta don tuntuɓarShanghai Wangyuanidan akwai wata damuwa ko buƙata game da RTD & TR.
Lokacin aikawa: Dec-30-2024