Fasaha, Electronics
Sensor Thermometer Resistance
Ana iya yin amfani da ƙwayoyin ƙarfe don canja kaya ta jiki a ƙarƙashin tasirin zazzabi a amfani da kayan aiki. Saboda haka, misali, platinum juriya ma'aunin zafi da sanyio yana amfani da wani karfe dukiya ta kara yawan wutar lantarki da juriya tare da kara yawan zafin jiki. Alal misali, a t = 0 C. platinum yana da wani resistivity na 100 ohms.
Hanya na firikwensin yana da sauki. Mahallin ƙarfin ƙarfe na ƙarfe yana kunshe da lambobi uku, guda biyu an rufe tare, kuma na uku shine na kowa, yana da juriya na 120 Ω. Shirin haɗi yana da nau'i nau'i-nau'i uku, ko da yake akwai banda. Kebul daga kayan aiki zuwa iko dole ne a kiyaye shi daga tsangwama na waje. Dole ne a sa shi tare da igiyoyi na lantarki kuma dole ne a kiyaye shi.
A lokacin shigarwa, an fara "thermowell" a cikin shafin samfurin. Wannan nau'i ne mai kariya, wanda aka tsara don sauƙaƙe da rarraba na'urar, don haka za'a iya maye gurbin firikwensin ba tare da tsayawa ba. Tun da kewayon yanayin yanayin da ake auna tsakanin 200 da 600 digiri Celsius, an yi amfani da hannayen kariya daga bakin karfe. Idan aka yi amfani da shi a cikin kwayar cutar mai yalwaci ko alkaline, ana amfani da thermowells tare da wani nau'in polymer wanda ya dace da matsakaici don auna.
Ana samar da ma'aunin ma'aunin zafi mai sanyi a kasashe da dama na duniya. Mafi shahararrun samfurin shine "Wika" na Amurka, Rasha "Metran" da Turai "Endress Hauser". Wadannan na'urorin suna da matsayi mai zurfi na dogara. Ba su iya ba kawai don aikawa da yawan zazzabi, amma har ma sun auna a sauyin yanayin sauyawa.
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