Zafin jiki shine ainihin adadin lissafi, kuma duk abin da ke faruwa a cikin yanayi yana da alaƙa da zafin jiki. Na'urorin firikwensin zafin jiki shine nau'in firikwensin da aka fara haɓaka da aka fi amfani da su. Kasuwancin firikwensin zafi ya wuce sauran firikwensin. Tun farkon karni na 17 mutane sun fara amfani da yanayin zafi don aunawa. Tare da goyon bayan fasahar semiconductor, an haɓaka na'urorin firikwensin thermocouple na semiconductor, na'urorin firikwensin zafin jiki na PN da na'urorin firikwensin zafin jiki masu haɗin kai a wannan karni. Daidai da haka, bisa ga dokar hulɗar raƙuman ruwa da abubuwa, an haɓaka masu auna yanayin zafi na sauti, masu auna yanayin infrared da masu auna yanayin microwave.

Mai gudanarwa na kayan daban-daban biyu, kamar haɗuwa da juna a wani lokaci, yana dumama wannan haɗin haɗin, wanda zai bayyana bambancin ƙarfi a wuraren da ba su dumama ba. Darajar wannan bambancin ƙarfin yana da alaƙa da zafin jiki a wuraren aunawa ba tare da dumama ba, kuma yana da alaƙa da kayan waɗannan masu gudanarwa biyu. Wannan lamarin zai iya bayyana a cikin yanayin zafin jiki mai faɗi, idan an auna wannan bambancin damar daidai, sannan an auna yanayin zafin jiki na wuraren da ba a dumama ba, za a iya sanin yanayin zafin jiki na wurin dumama daidai. Saboda dole ne ya kasance mai gudanarwa na kayan daban-daban biyu, an kira shi "thermocouple". Ana amfani da thermocouples da aka yi da kayan daban-daban a cikin yanayin zafi daban-daban, kuma ƙwarewar su ta bambanta. Thermocouple's hankali yana nufin adadin canji na fitarwa damar bambanci lokacin da zafin jiki na dumama ya canza 1 ℃. Ga mafi karfe kayan tallafawa thermocouples, wannan darajar ne kusan tsakanin 5 ~ 40 microvolts / C.

Mai auna firikwensin thermocouple yana da fa'idodi da rashin amfani, yana da ƙananan ƙwarewa, yana da sauƙin tasirin siginar tsangwama na muhalli, kuma yana da sauƙin tasirin zafin jiki na pre-amplifier, saboda haka ba ya dace da auna ƙananan canje-canje na zafin jiki. Saboda ƙwarewar firikwensin zafin jiki na thermocouple ba ta da alaƙa da ƙarfin kayan ba, ana iya yin firikwensin zafin jiki tare da ƙananan kayan. Hakanan saboda kayan ƙarfe da ke yin thermocouple suna da kyakkyawan ƙarfi, wannan ƙaramin kayan aikin ƙididdigar zafi yana da saurin amsawa mai yawa wanda zai iya auna hanyoyin canje-canje masu sauri.

Temperature firikwensin ne mafi yawan amfani da daya daga cikin daban-daban firikwensin, zamani zazzabi firikwensin siffar ne sosai kananan, don haka mafi sa shi yadu amfani a cikin daban-daban fannoni na samar da ayyuka, kuma samar da yawa m da ayyuka ga rayuwarmu.

Akwai manyan nau'ikan firikwensin zafin jiki guda huɗu: thermocouples, thermostats, masu gano zafin jiki na juriya (RTD), da kuma firikwensin zafin jiki na IC. IC zazzabi firikwensin kuma ya haɗa da biyu nau'ikan analog fitarwa da kuma dijital fitarwa.