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

Ngokuphathelene nokudluliswa kwesignali yokudlulisa ezinhlotsheni zokusebenza zokwenza izinto ngokuzenzakalela kwezimboni, i-4~20mA ingenye yezinketho ezivame kakhulu. Uma kuzoba nobudlelwano obuqondile phakathi kokuguquguquka kwenqubo (ingcindezi, izinga, izinga lokushisa, njll.) kanye nomphumela wamanje. I-4mA imelela umkhawulo ophansi, i-20mA imelela umkhawulo ophezulu, kanti ububanzi buyi-16mA. Yiziphi izinhlobo zenzuzo ezihlukanisa i-4~20mA kwezinye izinto zamanje kanye ne-voltage bese zithandwa kangaka?

I-current kanye ne-voltage zombili zisetshenziselwa ukudlulisa isignali kagesi. Kodwa-ke, isignali yamanje ithandwa kakhulu kune-voltage ekusetshenzisweni kwezinsimbi. Esinye sezizathu eziyinhloko ukuthi ukuphuma kwamanje okuqhubekayo akunakwenzeka ukuthi kubangele ukwehla kwe-voltage ekudlulisweni kwebanga elide njengoba ikwazi ukuphakamisa i-voltage yokushayela ukuze ibuyisele ukwehla kwe-transmission. Okwamanje, uma kuqhathaniswa ne-voltage signal, i-current ibonisa ubudlelwano obuqondile kakhulu neziguquguquko zenqubo ezifaka isandla ekulinganisweni nasekunxephezelweni okulula kakhulu.

Isidluliseli Sezinga Lokucwiliswa Esivikela Umbani, 4~20mA 2-wire

Ngokungafani nezinye izikali zesignali zamanje ezijwayelekile (0~10mA, 0~20mA njll.) isici esiyinhloko se-4~20mA ukuthi ayikhethi i-0mA njengomkhawulo ophansi ohambisanayo webanga lokulinganisa. Isizathu sokwenyusa isikali esingu-zero sibe esiphilayo ukubhekana nenkinga ye-dead zero okusho ukuthi ukungakwazi ukubona ukungasebenzi kahle kwesistimu kubangela ukwehluleka kuholela ekuphumeni kwe-0mA okungaqondakali uma isikali samanje esiphansi naso singu-0mA. Ngokuphathelene nesignali engu-4~20mA, ukuqhekeka kungabonakala ngokucacile ngokwehla kwamandla kagesi ngaphansi kwe-4mA njengoba bekungeke kubhekwe njengenani elilinganisiwe. 

4~20mA Umthumeli Wokucindezela Ohlukile, ophilayo ongu-zero 4mA

Ngaphezu kwalokho, umkhawulo ophansi we-4mA uqinisekisa ukusetshenziswa kwamandla okuncane okudingekayo ukuze kusetshenziswe ithuluzi kuyilapho umkhawulo ophezulu we-20mA ukhawulela ukulimala okubulalayo emzimbeni womuntu ngezizathu zokuphepha. Isilinganiso sobubanzi esingu-1:5 esihambisana nohlelo lokulawula umoya lwendabuko sisiza ekubalweni okulula kanye nomklamo ongcono. Izintambo ezimbili ezisebenza ngeluphu yamanje zinokuzivikela komsindo okuqinile okulula ukuzifaka.

Lezi zinzuzo kuzo zonke izici ngokwemvelo zenza i-4-20mA ibe ngenye yezindlela ezisebenziseka kakhulu zokukhiqiza izinsimbi ezenzakalelayo zokulawula izinqubo. I-Shanghai WangYuan ingumkhiqizi wezinsimbi oneminyaka engaphezu kwengu-20. Sihlinzeka ngezinsimbi ezinhle kakhulu ezine-4-20mA noma ezinye izinketho zokukhiqiza ezenziwe ngokwezifiso ze-ingcindezi, izinga, izinga lokushisafuthiukugelezaukulawula.