Kungani i-4~20mA 2-wire Iba Umphumela Ovamile Wokudluliswa Kwezinto

Ngokuphathelene nokudluliswa kwesignali yokudlulisela kuzinhlelo zokusebenza ezishintshayo zezimboni, i-4 ~ 20mA ingenye yezinketho ezivame kakhulu. Esimeni kuzoba nobudlelwano bomugqa phakathi kokuguquguquka kwenqubo(ingcindezi, ileveli, izinga lokushisa, njll.) kanye nokuphumayo kwamanje. I-4mA imele umkhawulo ophansi, i-20mA imele umkhawulo ongaphezulu, kanti ubude bebanga ngu-16mA. Yiziphi izinhlobo zenzuzo ezihlukanisa i-4 ~ 20mA kokunye ukuphuma kwamanje kanye ne-voltage futhi zidume kakhulu?

Amanje kanye ne-voltage zombili zisetshenziselwa ukudlulisa isignali kagesi. Kodwa-ke isignali yamanje ikhethwa kakhulu kune-voltage kuzinhlelo zokusebenza zezinsimbi. Esinye sezizathu eziyinhloko ukuthi okukhiphayo okuqhubekayo kwamanje mancane amathuba okuba kubangele ukwehla kwamandla kagesi ekudluliselweni kwebanga elide njengoba kukwazi ukunyusa i-voltage yokushayela ukuze kunxephezele ukunqamuka kokudlulisela. Ngaleso sikhathi, uma kuqhathaniswa nesiginali ye-voltage, yamanje ibonisa ubudlelwano bomugqa kanye nezinqubo eziguquguqukayo ezifaka isandla ekulinganisweni okulula nesinxephezelo.

Isidlulisi Seleveli Yokucwiliswa Kombani, 4~20mA 2-wire

Ngokuphambene nesinye isikali sesignali esivamile samanje(0~10mA, 0~20mA njll.) isici esiyinhloko se-4~20mA ukuthi ayikhethi u-0mA njengomkhawulo ophansi ohambisanayo wobubanzi bokulinganisa. Isizathu sokukhuphula isikali esinguziro sibe kwesiphilayo ukubhekana nenkinga enguziro efile okusho ukuthi ukungakwazi ukubona ukungasebenzi kahle kwesistimu kubangela ukwehluleka kuholela ekuphumeni okungu-0mA okungaqondakali uma isikali samanje esiphansi siphinde sibe ngu-0mA. Ngokuqondene nesignali engu-4~20mA, ukwehla kungase kukhonjwe ngokucacile ngokwehla okungavamile kwamanje ngaphansi kuka-4mA njengoba bekungeke kubhekwe njengenani elilinganiselwe. 

4~20mA Differential Pressure Transmitter, bukhoma zero 4mA

Ukwengeza, umkhawulo ophansi we-4mA uqinisekisa ukusetshenziswa kwamandla okuncane okudingekayo ukuze kusetshenziswe ithuluzi kuyilapho umkhawulo ophezulu ongu-20mA ukhawulela ukulimala okubulalayo emzimbeni womuntu ngenxa yezizathu zokuphepha. Isilinganiso sobubanzi obungu-1:5 esihambisana nesistimu yokulawula umoya womoya sinikela ekubaleni okulula nokuklama okungcono. Intambo engu-2 yamanje ene-loop inamandla okugomela umsindo ilungele ukufakwa.

Lezi zinzuzo kuzo zonke izici ngokwemvelo zenza i-4-20mA ibe enye yezinsimbi eziguquguqukayo kakhulu ekulawuleni okuzenzakalelayo kwenqubo. I-Shanghai WangYuan ingumkhiqizi wezinsimbi zeminyaka engaphezu kwengu-20. Sihlinzeka ngamathuluzi avelele ane-4-20mA noma ezinye izinketho zokukhipha ezenziwe ngezifisoingcindezi, izinga, izinga lokushisafuthiukugelezaukulawula.