Kutheni i-4 ~ 20mA 2-ingcingo Iba sisiPhumo esiPhambili sesiThuthi

Ngokubhekiselele ekuhanjisweni kwesignali kwi-application automation ye-industrial, i-4 ~ 20mA yenye yezona zikhetho eziqhelekileyo. Kwimeko apho kuya kubakho ubudlelwane bomgca phakathi kwenkqubo eguquguqukayo( uxinzelelo, umgangatho, ubushushu, njl. njl.) kunye nesiphumo sangoku. I-4mA imele umda ophantsi, i-20mA imele umda ophezulu, kunye noluhlu lwe-16mA. Ziziphi iintlobo zenzuzo eyahlula i-4 ~ 20mA kwezinye iziphumo zangoku kunye ne-voltage kwaye idume kakhulu?

Okwangoku kunye ne-voltage zombini zisetyenziselwa ukuhambisa umqondiso wombane. Nangona kunjalo isignali yangoku ikhethwa ngakumbi kunombane kwizixhobo zokusebenza. Esinye sezizathu ezingundoqo kukuba imveliso eqhubekayo yangoku ayinakwenzeka ukuba ibangele ukuhla kwamandla ombane kuluhlu olude lokuhanjiswa njengoko ikwazi ukunyusa amandla ombane okuqhuba ukuhlawula ukuhanjiswa. Okwangoku, xa kuthelekiswa nesiginali yombane, yangoku ibonisa unxulumano olunemigca ethe kratya kunye nenkqubo eguquguqukayo enegalelo kuhlengahlengiso olulula ngakumbi kunye nembuyekezo.

Umbane woKhuseleko lweNqanaba lokuTyelwa koMbane, i-4 ~ 20mA i-2-wire

Ngokuchaseneyo nesinye isikali somqondiso oqhelekileyo wangoku (0 ~ 10mA, 0 ~ 20mA njl.) uphawu oluphambili lwe-4 ~ 20mA alukhethi i-0mA njengomda ophantsi ohambelanayo woluhlu lokulinganisa. Ingqiqo yokunyuka umlinganiselo we-zero ukuya kulowo uphilayo kukujongana nengxaki engu-zero efileyo ethetha ukungakwazi ukubona ukungasebenzi kakuhle kwenkqubo kubangela ukusilela kukhokelela kwisiphumo se-0mA esingenakuchazwa ukuba isikali esisezantsi sangoku sikwayi-0mA. Ngokubhekiselele kumqondiso we-4 ~ 20mA, ukuphuka kunokuchongwa ngokucacileyo ngokuhla ngokungaqhelekanga ngaphantsi kwe-4mA ekubeni akuyi kuthathwa njengexabiso elilinganisiweyo. 

I-4 ~ 20mA i-Differential Pressure Transmitter, iphila i-zero 4mA

Ukongeza, umda osezantsi we-4mA uqinisekisa ubuncinci bokusetyenziswa kwamandla ayimfuneko ukuze usebenze isixhobo ngelixa umda ophezulu we-20mA unqanda ukwenzakala okufayo kumzimba womntu ngenxa yezizathu zokhuseleko. I-1: i-5 yoluhlu oluhambelanayo nenkqubo yolawulo lwe-pneumatic yendabuko inegalelo ekubaleni okulula kunye noyilo olungcono. I-loop yangoku ene-2-wire ine-immunity eyomeleleyo yengxolo ilungele ukufakwa.

Ezi zibonelelo kuzo zonke iinkalo ngokwendalo zenza i-4-20mA ibe yenye yezona zinto ziguquguqukayo zesixhobo sokuvelisa kwinkqubo yolawulo oluzenzekelayo. I-Shanghai WangYuan ngumvelisi wezixhobo zokusebenza ezingaphezulu kweminyaka engama-20. Sibonelela ngezixhobo ezibalaseleyo nge-4-20mA okanye ezinye iinketho zokuphuma ezilungiselelweuxinzelelo, inqanaba, ubushushukwayeukuhambaulawulo.