Funda oku Kwanele malunga nokuba yintoni 4-20mA Isiphumo

Yintoni imveliso ye-4-20mA?

1. Intshayelelo

I-4-20mA (milliamp) luhlobo lwangoku lombane oluqhelekileyo olusetyenziselwa ukuhambisa iimpawu ze-analog kwinkqubo yokulawula inkqubo yoshishino kunye neenkqubo ezizenzekelayo.Yi-loop yangoku ene-self-powered, i-low-voltage yangoku ekwazi ukuhambisa imiqondiso kumgama omde kunye neendawo ezinengxolo yombane ngaphandle kokuthoba kakhulu umqondiso.

Uluhlu lwe-4-20mA lubonisa ubude be-milliamp ye-16, kunye ne-milliamp ezine ezimele ubuncinci okanye ixabiso le-zero yesiginali kunye ne-20 milliamp emele ubuninzi okanye ixabiso elipheleleyo lomqondiso.Ixabiso langempela lesignali ye-analog ehanjiswayo ifakwe kwikhowudi njengesithuba ngaphakathi kolu luhlu, kunye nenqanaba langoku lilingana nexabiso lomqondiso.

I-4-20mA isiphumo sihlala sisetyenziselwa ukuhambisa izibonakaliso ze-analog ezivela kwi-sensor kunye nezinye izixhobo zentsimi, ezifana ne-probes yeqondo lokushisa kunye ne-pressure transducers, ukulawula nokubeka iliso kwiinkqubo.Ikwasetyenziselwa ukuhambisa imiqondiso phakathi kwamacandelo ahlukeneyo ngaphakathi kwenkqubo yolawulo, njengokusuka kwisilawuli sengqiqo ecwangcisiweyo (PLC) ukuya kwi-actuator yevalvu.

Kwi-automation ye-industrial, i-4-20mA isiphumo sisignali esetyenziswa ngokuqhelekileyo yokuhambisa ulwazi kwiinzwa kunye nezinye izixhobo.Imveliso ye-4-20mA, ekwabizwa ngokuba yi-loop yangoku, yindlela eyomeleleyo nethembekileyo yokuhambisa idatha kumgama omde, nakwiindawo ezinengxolo.Esi sithuba seblogi siya kuphonononga iziseko ze-4-20mA zemveliso, kubandakanywa nendlela esebenza ngayo kunye neenzuzo kunye nokungalunganga kokuyisebenzisa kwiinkqubo zokuzenzekelayo zoshishino.

I-4-20mA isiphumo sisignali ye-analog ethunyelwa kusetyenziswa i-current current ye-4-20 milliamps (mA).Ihlala isetyenziselwa ukuhambisa ulwazi malunga nomlinganiselo wobungakanani bomzimba, njengoxinzelelo, ubushushu, okanye izinga lokuhamba.Umzekelo, inzwa yobushushu inokuhambisa i-4-20mA yesiginali ngokuhambelana nobushushu obulinganisayo.

Enye yeenzuzo eziphambili zokusebenzisa i-4-20mA imveliso kukuba ngumgangatho wehlabathi jikelele kwi-automation ye-industrial.Kuthetha ukuba uluhlu olubanzi lwezixhobo, ezifana nezinzwa, abalawuli, kunye ne-actuators, zenzelwe ukuhambelana neempawu ze-4-20mA.Yenza ukudibanisa izixhobo ezitsha kwinkqubo ekhoyo kulula, nje ukuba zixhasa i-4-20mA output.

2.）Isebenza njani imveliso ye-4-20mA?

I-4-20mA imveliso ihanjiswa kusetyenziswa i-loop yangoku, equkethe i-transmitter kunye ne-receiver.Umthumeli, ngokuqhelekileyo inzwa okanye esinye isixhobo esilinganisa ubungakanani bomzimba, sivelisa isignali ye-4-20mA kwaye siyithumela kumamkeli.Umamkeli, ngokuqhelekileyo umlawuli okanye esinye isixhobo esinoxanduva lokusetyenzwa komqondiso, ufumana isignali ye-4-20mA kwaye itolika ulwazi oluquletheyo.

Ukuze isignali ye-4-20mA idluliselwe ngokuchanekileyo, kubalulekile ukugcina i-current current ngokusebenzisa i-loop.Iphunyezwe ngokusebenzisa i-resistor-limiting current kwi-transmitter, ekhawulela inani langoku elinokuhamba ngesiphaluka.Ukuchasana kwe-resistor yokunciphisa okwangoku kukhethwe ukuvumela uluhlu olufunwayo lwe-4-20mA ukuba luhambe nge-loop.

Enye yeenzuzo eziphambili zokusebenzisa i-loop yangoku kukuba ivumela umqondiso we-4-20mA ukuba udluliselwe kumgama omde ngaphandle kokubandezeleka kokuthotywa komqondiso.Kungenxa yokuba isignali ihanjiswa njengangoku kunokuba i-voltage, engaphantsi kwengxaki yokuphazamiseka kunye nengxolo.Ukongeza, iilophu zangoku zinokusasaza isiginali ye-4-20mA ngaphezulu kwezibini ezijijekileyo okanye iintambo ze-coaxial, ukunciphisa umngcipheko wokuthotywa komqondiso.

3.） Izinto ezilungileyo zokusebenzisa imveliso ye-4-20mA

Kukho iingenelo ezininzi zokusebenzisa imveliso ye-4-20mA kwiinkqubo ezizisebenzelayo zoshishino.Ezinye zezibonelelo eziphambili ziquka:

Ugqithiso lwesignali yomgama omde:Imveliso ye-4-20mA inokuhambisa imiqondiso kumgama omde ngaphandle kokuthotywa kophawu.Ilungele ukusetyenziswa kwizicelo apho i-transmitter kunye ne-receiver ziqelelene kakhulu, njengezityalo ezinkulu zemizi-mveliso okanye iirigi ze-oyile ezikude nonxweme.

A: Ukhuselo lwengxolo ephezulu:Iilophu zangoku zixhathisa kakhulu kwingxolo kunye nokuphazamiseka, nto leyo eyenza ukuba ilungele ukusetyenziswa kwiindawo ezinengxolo.Kubaluleke kakhulu kwizicwangciso zemizi-mveliso, apho ingxolo yombane evela kwiimoto kunye nezinye izixhobo zingabangela iingxaki ngokuhanjiswa komqondiso.

B: Iyahambelana noluhlu olubanzi lwezixhobo:Njengoko i-4-20mA imveliso ingumgangatho wendalo yonke kwi-automation ye-industrial, iyahambelana nezixhobo ezininzi.Yenza ukudibanisa izixhobo ezitsha kwinkqubo ekhoyo kulula, nje ukuba zixhasa i-4-20mA output.

4.) Ukungalungi kokusebenzisa i-4-20mA output

Ngelixa i-4-20mA imveliso ineengenelo ezininzi, kukwakho ezinye iingxaki zokuyisebenzisa kwiinkqubo zokuzisebenzela kwimizi-mveliso.Ezi ziquka:

A: Isisombululo esilinganiselweyo:I-4-20mA isiphumo sisignali ye-analog ehanjiswa ngokusebenzisa uluhlu oluqhubekayo lwamaxabiso.Nangona kunjalo, isisombululo somqondiso sinqunyelwe uluhlu lwe-4-20mA, eyi-16mA kuphela.Oku kunokunganeli kwizicelo ezifuna iqondo eliphezulu lokuchaneka okanye ubuntununtunu.

B: Ukuxhomekeka kubonelelo lombane:Ukuze isignali ye-4-20mA idluliselwe ngokuchanekileyo, kubalulekile ukugcina i-current current ngokusebenzisa i-loop.Oku kufuna unikezelo lwamandla, olunokuba yindleko eyongezelelweyo kunye nobunzima kwinkqubo.Ukongezelela, ukunikezelwa kwamandla kunokusilela okanye kuphazamiseke, oku kunokuchaphazela ukuhanjiswa kwesignali ye-4-20mA.

5.) Isiphelo

Imveliso ye-4-20mA luhlobo olusetyenziswa ngokubanzi lwesignali kwiinkqubo zokuzenzekelayo zoshishino.Ihanjiswa kusetyenziswa i-current current ye-4-20mA kwaye ifunyenwe kusetyenziswa i-loop yangoku equkethe i-transmitter kunye ne-receiver.Imveliso ye-4-20mA ineenzuzo ezininzi, kubandakanywa ukuhanjiswa kwesignali yomgama omde, ukugonywa kwengxolo ephezulu, kunye nokuhambelana noluhlu olubanzi lwezixhobo.Nangona kunjalo, ikwanazo ezinye iingxaki, kubandakanywa isisombululo esilinganiselweyo kunye nokuxhomekeka kumbane.Ngokubanzi, imveliso ye-4-20mA yindlela ethembekileyo neyomeleleyo yokuhambisa idatha kwiinkqubo ezizenzekelayo zoshishino.

Uthini Umahluko phakathi kwe-4-20ma, 0-10v, 0-5v, kunye ne-I2C Output?

I-4-20mA, 0-10V, kunye ne-0-5V zonke zizibonakaliso ze-analog ezisetyenziswa ngokuqhelekileyo kwi-industrial automation kunye nezinye izicelo.Zisetyenziselwa ukuhambisa ulwazi malunga nomlinganiselo wobungakanani bomzimba, njengoxinzelelo, ubushushu, okanye izinga lokuhamba.

Umahluko ophambili phakathi kwezi ntlobo zemiqondiso luluhlu lwamaxabiso anokuthi adlulisele.Iimpawu ze-4-20mA zihanjiswa kusetyenziswa i-current current ye-4-20 milliamps, izibonakaliso ze-0-10V zihanjiswa ngokusebenzisa i-voltage ukusuka kwi-0 ukuya kwi-10 volts, kunye ne-0-5V iimpawu zihanjiswa ngokusebenzisa i-voltage ukusuka kwi-0 ukuya kwi-5 volts.

I-I2C (I-Inter-Integrated Circuit) yinkqubo yonxibelelwano yedijithali esetyenziselwa ukuhambisa idatha phakathi kwezixhobo.Isetyenziswa ngokuqhelekileyo kwiinkqubo ezifakelweyo kunye nezinye izicelo apho izixhobo ezininzi kufuneka zinxibelelane.Ngokungafani neempawu ze-analog, ezihambisa ulwazi njengoluhlu oluqhubekayo lwamaxabiso, i-I2C isebenzisa uluhlu lwee-pulses zedijithali ukuhambisa idatha.

Nganye kwezi ntlobo zezibonakaliso zineenzuzo zayo kunye nokungonakali, kwaye ukhetho olungcono luya kuxhomekeka kwiimfuno ezithile zesicelo.Ngokomzekelo, izibonakaliso ze-4-20mA zihlala zikhethwa kwi-transmission yesignali yomgama omde kunye nokukhuseleka kwengxolo ephezulu, ngelixa i-0-10V kunye ne-0-5V izibonakaliso zinokunika isisombululo esiphezulu kunye nokuchaneka okungcono.I-I2C isetyenziswa ngokubanzi kunxibelelwano olufutshane phakathi kwenani elincinci lezixhobo.

1. Uluhlu lwamaxabiso:Iimpawu ze-4-20mA zihambisa i-current ukusuka kwi-4 ukuya kwi-20 milliamps, izibonakaliso ze-0-10V zihambisa i-voltage ukusuka kwi-0 ukuya kwi-10 volts, kunye ne-0-5V izibonakaliso zihambisa i-voltage ukusuka kwi-0 ukuya kwi-5 volts.I-I2C yiprotocol yonxibelelwano lwedijithali kwaye ayidlulisi amanani aqhubekayo.

2. Ugqithiso loMqondiso:Iimpawu ze-4-20mA kunye ne-0-10V zithunyelwa kusetyenziswa i-loop yangoku okanye i-voltage, ngokulandelanayo.Iimpawu ze-0-5V nazo zihanjiswa kusetyenziswa i-voltage.I-I2C isasazwa kusetyenziswa uluhlu lwee-pulses zedijithali.

3. Ukuhambelana:Iimpawu ze-4-20mA, 0-10V, kunye ne-0-5V ngokuqhelekileyo zihambelana nezixhobo ezininzi, njengoko zisetyenziswa ngokubanzi kwi-industrial automation kunye nezinye izicelo.I-I2C isetyenziswe ngokuyinhloko kwiinkqubo ezifakwe kunye nezinye izicelo apho ezininzi izixhobo kufuneka zinxibelelane.

4. Isigqibo:Iimpawu ze-4-20mA zinesisombululo esilinganiselweyo ngenxa yoluhlu olulinganiselwe lwamaxabiso anokuthi aluthumele (kuphela i-16mA).Iimpawu ze-0-10V kunye ne-0-5V zinokubonelela ngesisombululo esiphezulu kunye nokuchaneka okungcono, kuxhomekeke kwiimfuno ezithile zesicelo.I-I2C yiprotocol yedijithali kwaye ayinaso isisombululo ngendlela efanayo nemiqondiso ye-analog.

5. Ukhuselo lwengxolo:Iimpawu ze-4-20mA zixhathisa kakhulu kwingxolo kunye nokuphazamiseka ngenxa yokusebenzisa i-loop yangoku yokuhambisa umqondiso.Iimpawu ze-0-10V kunye ne-0-5V zinokuthi zichaphazeleke ngakumbi kwingxolo, kuxhomekeke ekuphunyezweni okuthe ngqo.I-I2C ngokuqhelekileyo iyaxhathisa kwingxolo njengoko isebenzisa i-pulses yedijithali yokuhambisa umqondiso.

Yeyiphi eyona isetyenziswa kakhulu?

Yeyiphi eyona ndlela ilungileyo yokukhupha ubushushu kunye nesithumeli sokufuma?

Kunzima ukutsho ukuba loluphi ukhetho lwemveliso olona lusetyenziswa kakhulu kwizithuthi zobushushu kunye nokufuma, njengoko kuxhomekeke kwisicelo esikhethekileyo senkqubo kunye neemfuno.Nangona kunjalo, i-4-20mA kunye ne-0-10V zisetyenziswa ngokubanzi ukuhambisa imilinganiselo yobushushu kunye nokufuma kwi-automation ye-industrial kunye nezinye izicelo.

I-4-20mA lukhetho oludumileyo lwee-transmitter zobushushu kunye nokufuma ngenxa yokuqina kwayo kunye namandla okuhambisa umgama omde.Ikwamelana nengxolo kunye nokuphazamiseka, okwenza ukuba ilungele ukusetyenziswa kwiindawo ezinengxolo.

I-0-10V yenye inketho esetyenziswa ngokubanzi kwi-transmitter yobushushu kunye nokufuma.Inika isisombululo esiphezulu kunye nokuchaneka okungcono kune-4-20mA, enokubaluleka kwizicelo ezifuna ukuchaneka okuphezulu.

Ekugqibeleni, olona khetho lubalaseleyo lwemveliso yobushushu kunye nokufuma kokuhambisa kuya kuxhomekeka kwiimfuno ezithile zesicelo.Izinto kumgama phakathi komthumeli kunye nomamkeli, inqanaba lokuchaneka kunye nesisombululo esifunekayo, kunye nendawo yokusebenza (umzekelo, ubukho bengxolo kunye nokuphazamiseka).

Yintoni usetyenziso olungundoqo lwe-4-20mA Imveliso ?

Imveliso ye-4-20mA isetyenziswa ngokubanzi kwi-automation ye-industrial kunye nezinye izicelo ngenxa yokuqina kwayo kunye namandla okuhambisa umgama omde.Ezinye izicelo eziqhelekileyo ze-4-20mA zemveliso ziquka:

1. Ulawulo Lwenkqubo:I-4-20mA isoloko isetyenziselwa ukuhambisa izinto eziguquguqukayo zenkqubo, ezifana nobushushu, uxinzelelo, kunye nesantya sokuhamba, ukusuka kwiinzwa ukuya kubalawuli kwiinkqubo zokulawula inkqubo.
2. Izixhobo zoShishino:I-4-20mA isetyenziswa ngokuqhelekileyo ukuhambisa idatha yokulinganisa ukusuka kwizixhobo zoshishino, ezifana neemitha zokuhamba kunye neenzwa zezinga, kubalawuli okanye iziboniso.
3. Ulwakhiwo oluzenzekelayo:I-4-20mA isetyenziselwa ukwakha iinkqubo ezizenzekelayo ukuhambisa ulwazi malunga nobushushu, umswakama, kunye nezinye iimeko zokusingqongileyo ukusuka kwiinzwa ukuya kubalawuli.
4. Ukuveliswa koMbane:I-4-20mA isetyenziswe kwizityalo zokuvelisa amandla ukuhambisa idatha yokulinganisa ukusuka kwiinzwa kunye nezixhobo kubalawuli kunye neziboniso.
5. I-oyile neGesi:I-4-20mA isetyenziswa ngokuqhelekileyo kwishishini leoli kunye negesi ukuhambisa idatha yokulinganisa ukusuka kwiinzwa kunye nezixhobo kwiiplatifti ze-offshore kunye nemibhobho.
6. Ukucocwa kwamanzi kunye namanzi amdaka:I-4-20mA isetyenziswe kumanzi kunye nezityalo zokucoca amanzi amdaka ukuhambisa idatha yokulinganisa ukusuka kwiinzwa kunye nezixhobo kubalawuli kunye neziboniso.
7. Ukutya kunye nesiselo:I-4-20mA isetyenziselwa kwishishini lokutya kunye nesiselo ukuhambisa idatha yokulinganisa ukusuka kwiinzwa kunye nezixhobo kubalawuli kunye neziboniso.
8. Iimoto:I-4-20mA isetyenziselwa ushishino lweemoto ukuhambisa idatha yokulinganisa ukusuka kwiinzwa kunye nezixhobo kubalawuli kunye neziboniso.

Ngaba unomdla wokufunda ngakumbi malunga ne-4-20 yethu yobushushu kunye nokufuma kwe-transmitter?Qhagamshelana nathi nge-imeyileka@hengko.comukufumana yonke imibuzo yakho iphendulwe kwaye ufumane ulwazi oluninzi malunga nemveliso yethu.Silapha ukukunceda wenze esona sigqibo silungileyo kwiimfuno zakho.Ungalibazisi ukunxibelelana nathi - sijonge phambili ukuva kuwe!