Kuki 4-20mA?

Niki 4-20mA?

Ikimenyetso cya 4-20mA DC (1-5V DC) gisobanurwa na komisiyo mpuzamahanga ishinzwe amashanyarazi (IEC) kandi ikoreshwa mubimenyetso bisa muri sisitemu yo kugenzura inzira.

Muri rusange, ibimenyetso byerekana ibikoresho na metero byashyizwe kuri 4-20mA, hamwe na 4mA byerekana byibuze byibuze na 20mA byerekana umuyaga mwinshi.

Kuki ibisohoka ubu?

Mu nganda zinganda, gukoresha ibimenyetso byongera ibimenyetso kugirango uhindure kandi wohereze ibimenyetso intera ndende ukoresheje ibimenyetso bya voltage birashobora gukurura ibibazo byinshi. Ubwa mbere, ibimenyetso bya voltage byanyujijwe hejuru yinsinga birashobora kwanduzwa n urusaku. Icya kabiri, gukwirakwiza gukwirakwiza imirongo yohereza bishobora gutera imbaraga za voltage. Icya gatatu, gutanga imbaraga kubimenyetso byongera imbaraga mumurima birashobora kugorana.

Kugira ngo ibyo bibazo bikemuke kandi ugabanye ingaruka z’urusaku, ikigezweho gikoreshwa mu kohereza ibimenyetso kuko bitumva neza urusaku. Umuyoboro wa 4-20mA ukoresha 4mA kugirango ugaragaze ibimenyetso bya zeru na 20mA kugirango ugaragaze ibimenyetso byuzuye, hamwe nibimenyetso biri munsi ya 4mA no hejuru ya 20mA bikoreshwa mubimenyesha amakosa atandukanye.

Kuki dukoresha 4-20mA DC (1-5V DC)?

Ibikoresho byo mu murima birashobora gushyira mubikorwa sisitemu ebyiri, aho amashanyarazi nu mutwaro bihujwe murukurikirane hamwe ningingo imwe, kandi insinga ebyiri gusa nizo zikoreshwa mugutumanaho ibimenyetso no gutanga amashanyarazi hagati yumuriro wumuriro nigikoresho cyo kugenzura. Gukoresha ikimenyetso cya 4mA DC nkibitangira bitanga amashanyarazi ahamye kuri transmitter, no gushyiraho amashanyarazi ya zeru kuri 4mA DC, idahuye na zeru ya zeru, ituma hamenyekana amakosa nko gutakaza amashanyarazi no kumena insinga . Byongeye kandi, sisitemu y'insinga ebyiri irakwiriye gukoresha inzitizi z'umutekano, zifasha mukurinda ibisasu.

Ibikoresho byo kugenzura ibyumba ukoresha voltage-parallel signal yoherejwe, aho ibikoresho bya sisitemu imwe yo kugenzura bisangiye itumanaho rusange, bigatuma byoroha mugupima ibikoresho, kubihindura, interineti ya mudasobwa, hamwe nibikoresho byo gutabaza.

Impamvu yo gukoresha 4-20mA DC mugutumanaho ibimenyetso hagati yibikoresho byo mu murima hamwe n’ibikoresho byo kugenzura ibyumba ni uko intera iri hagati yumurima nicyumba cyo kugenzura ishobora kuba ingirakamaro, biganisha ku nsinga ndende. Kohereza ibimenyetso bya voltage intera ndende birashobora kuvamo amakosa akomeye bitewe nigabanuka rya voltage ryatewe no kurwanya insinga hamwe no kwinjiza ibikoresho byakira. Gukoresha ibimenyetso bihoraho byerekana ibimenyetso byokwirakwiza kure byemeza ko ikizunguruka muri loop kidahinduka hatitawe ku burebure bwa kabili, byemeza kohereza neza.

Impamvu yo gukoresha ikimenyetso cya 1-5V DC kugirango ihuze hagati yicyumba cyo kugenzura ni ukorohereza ibikoresho byinshi byakira ikimenyetso kimwe no gufasha mu nsinga no gukora sisitemu zitandukanye zo kugenzura. Niba isoko yubu ikoreshwa nkikimenyetso cyo guhuza, mugihe ibikoresho byinshi byakiriye ikimenyetso kimwe icyarimwe, ibyinjira byinjira bigomba guhuzwa murukurikirane. Ibi bizarenza ubushobozi bwumutwaro wigikoresho cyohereza, kandi ibimenyetso byerekana ibimenyetso byerekana ibikoresho byakirwa byaba bitandukanye, bitangiza kwivanga no gukumira amashanyarazi hagati.

Gukoresha ibimenyetso bya voltage isoko yo guhuza bisaba guhindura ibimenyetso byubu bikoreshwa mugutumanaho nibikoresho byumurima mubimenyetso bya voltage. Uburyo bworoshye cyane ni uguhuza 250-ohm isanzwe irwanya urukurikirane rwumuzunguruko wubu, uhindura 4-20mA DC kuri 1-5V DC. Mubisanzwe, iki gikorwa kirangizwa na transmitter.

Iki gishushanyo gikoresha 250-ohm résistoriste kugirango ihindure ibimenyetso bya 4-20mA muri signal ya voltage ya 1-5V, hanyuma ikoresha akayunguruzo ka RC hamwe na diode ihujwe na microcontroller ya AD ihinduka pin.

"Hano wongeyeho igishushanyo cyoroheje cyumuzingi cyo guhindura ibimenyetso bya 4-20mA muri signal ya voltage:

Kuki transmitter yatoranijwe kugirango ikoreshe ikimenyetso cya 4-20mA DC kugirango ikwirakwizwa?

1. Ibitekerezo byumutekano kubidukikije bishobora guteza akaga: Umutekano mubidukikije bishobora guteza akaga, cyane cyane kubikoresho bitangiza ibisasu, bisaba kugabanya ingufu zikoreshwa ningufu zikenewe kugirango igikoresho gikore. Imashanyarazi isohora ibimenyetso bya 4-20mA DC mubisanzwe ikoresha amashanyarazi ya 24V DC. Imikoreshereze ya voltage ya DC ahanini ni ukubera ko ikuraho ibikenerwa na capacator nini na inductors kandi ikibanda ku bushobozi bwagabanijwe hamwe no kwinjiza insinga zihuza imiyoboro ya transmitter hamwe n’icyumba cyo kugenzura, ikaba iri munsi cyane y’umuriro wa gaze ya hydrogène.

2. Ihererekanyabubasha ryubu rirakunzwe kuruta isoko ya voltage: Mugihe aho intera iri hagati yumurima nicyumba cyo kugenzura iba myinshi, gukoresha ibimenyetso byerekana ingufu za voltage zoherejwe bishobora kuzana amakosa akomeye bitewe nigabanuka rya voltage ryatewe no kurwanya insinga no kwinjiza kurwanya igikoresho cyakira. Gukoresha ibimenyetso byerekana isoko yoherejwe kure yemeza ko ikigezweho muri loop gikomeza guhoraho, hatitawe ku burebure bwa kabili, bityo bikagumya kohereza neza.

3. Guhitamo 20mA nkibisanzwe ntarengwa: Guhitamo amashanyarazi ntarengwa ya 20mA bishingiye kubitekerezo byumutekano, ibikorwa bifatika, gukoresha ingufu, nigiciro. Ibikoresho biturika biturika birashobora gukoresha gusa voltage nkeya hamwe numuyoboro muke. Imiyoboro ya 4-20mA na 24V DC ifite umutekano kugirango ikoreshwe imbere ya gaze yaka umuriro. Umuriro wa gaz ya hydrogène hamwe na 24V DC ni 200mA, hejuru ya 20mA. Byongeye kandi, ibintu nkintera iri hagati yibikoresho bikorerwa ahakorerwa, umutwaro, gukoresha ingufu, ibikoresho bya elegitoroniki, nibisabwa kugirango harebwe ingufu.

4. Guhitamo 4mA nkintangiriro yo gutangira: Imashini nyinshi zisohora 4-20mA zikorera muri sisitemu y'insinga ebyiri, aho amashanyarazi n'umutwaro bihujwe mukurikirane hamwe ningingo imwe, kandi insinga ebyiri gusa zikoreshwa mugutumanaho ibimenyetso; n'amashanyarazi hagati yumurima wohereza hamwe nicyumba cyo kugenzura. Guhitamo 4mA itangira ningirakamaro kugirango imiyoboro ya transmitter ikore. 4mA itangira ikigezweho, ntabwo ihuye na mehaniki ya zeru, itanga "zeru ikora" ifasha kumenya amakosa nko gutakaza amashanyarazi no kumena insinga.

Gukoresha ibimenyetso bya 4-20mA byemeza ko bitavanze cyane, umutekano, no kwizerwa, bigatuma bimenyekana cyane mubikorwa byinganda. Ariko, ubundi buryo bwo gusohora ibimenyetso byerekana, nka 3.33mV / V, 2mV / V, 0-5V, na 0-10V, nabyo bikoreshwa mugukoresha neza ibimenyetso bya sensor no gushyigikira sisitemu zitandukanye zo kugenzura.