Kutheni i-4 ~ 20mA 2-wire iba yi-Mainstream Output ye-Transmitter

Ngokuphathelele ukuhanjiswa kwesignali yokudlulisa kwiizicelo ze-automation yemizi-mveliso, i-4~20mA yenye yezona zikhetho zixhaphakileyo. Kwimeko apho kuya kubakho ubudlelwane obuchanekileyo phakathi kokuguquguquka kwenkqubo (uxinzelelo, inqanaba, ubushushu, njl.njl.) kunye nemveliso yangoku. I-4mA imele umda ophantsi, i-20mA imele umda ophezulu, kwaye ububanzi bexesha yi-16mA. Ziziphi iintlobo zenzuzo ezahlula i-4~20mA kwezinye iziphumo zangoku kunye ne-voltage kwaye zithandwa kangaka?

I-current kunye ne-voltage zombini zisetyenziselwa ukudlulisa isignali yombane. Nangona kunjalo, i-current signal ikhethwa kakhulu kune-voltage kwizicelo zezixhobo. Esinye sezizathu eziphambili kukuba ukuphuma kwe-constant current akunakwenzeka ukuba kubangele ukwehla kwe-voltage kudluliselo olude njengoko lukwazi ukuphakamisa i-driven voltage ukuze kulungiswe ukuphelelwa yi-transmission. Okwangoku, xa kuthelekiswa ne-voltage signal, i-current ibonisa ubudlelwane obuthe tye kunye ne-process variables ezinegalelo ekulinganisweni nasekuhlawuleni ngokulula.

Isidluliseli seNqanaba lokuntywiliselwa esiKhuselwa nguMbane, 4~20mA esineentambo ezimbini

Ngokungafaniyo nezinye izikali zesiginali zangoku eziqhelekileyo (0~10mA, 0~20mA njl.njl.) uphawu oluphambili lwe-4~20mA kukuba ayikhethi i-0mA njengomda ophantsi ohambelanayo woluhlu lokulinganisa. Isizathu sokunyusa isikali se-zero siye kwesiphilayo kukujongana nengxaki ye-dead zero nto leyo ethetha ukuba ukungakwazi ukubona ukungasebenzi kakuhle kwenkqubo kubangela ukungaphumeleli okukhokelela kwisiphumo se-0mA esingabonakaliyo ukuba isikali sangoku esisezantsi sikwayi-0mA. Ngokuphathelele isiginali ye-4~20mA, ukuqhekeka kunokuchongwa ngokucacileyo ngokuwa komsinga ngokungaqhelekanga phantsi kwe-4mA kuba bekungayi kuthathwa njengexabiso elilinganisiweyo. 

I-4 ~ 20mA Transmitter yoxinzelelo olwahlukileyo, i-zero ephilayo ye-4mA

Ukongeza, umda ophantsi we-4mA uqinisekisa ukusetyenziswa kwamandla okuncinci okufunekayo ukuze isixhobo sisebenze ngelixa umda ophezulu we-20mA uthintela ukwenzakala okubulalayo emzimbeni womntu ngezizathu zokhuseleko. Umlinganiselo wobubanzi we-1:5 ohambelana nenkqubo yolawulo lwe-pneumatic yendabuko unceda ekubaleni lula kunye noyilo olungcono. Iingcingo ezimbini ezisebenza ngeluphu yangoku zinokhuseleko oluqinileyo lwengxolo kwaye kulula ukuzifaka.

Ezi nzuzo kuzo zonke iinkalo zenza i-4-20mA ibe yenye yezona zixhobo zibalaseleyo eziveliswayo kwi-automation yolawulo lwenkqubo. I-Shanghai WangYuan ngumvelisi wezixhobo ezingaphezu kweminyaka engama-20. Sinikezela ngezixhobo ezibalaseleyo ezine-4-20mA okanye ezinye iindlela zokukhupha ezenziwe ngokwezifiso.uxinzelelo, inqanaba, ubushushukwayeukuhambaulawulo.