Ingaba i-4-20mA Signal inokudluliselwa kude kangakanani?

Ingaba uMqondiso we-4-20mA unokudluliselwa kude kangakanani?

Oku akulula kangako ukunika impendulo umbuzo, ukuba ezinye iimpembelelo zonke ezinye izinto azihoywa, sinokuqikelela

ngokwemeko eqhelekileyo, inokuhamba malunga ne-200-500m. Masazi ngolwazi olusisiseko malunga ne-4-20mA.

1. Yintoni i-4-20mA Signal?

Isignali ye-4-20mA yiprotocol esemgangathweni esetyenziswa kumashishini amaninzi. Yindlela yokudlulisa idatha ye-analog yedatha kwi-loop yangoku yocingo-mbini, ukubonelela ngendlela ethembekileyo yokunxibelelana phakathi kwezixhobo. Amaxabiso asuka kwi-4-20mA amele i-0 ukuya kwi-100% yoluhlu lomlinganiselo.

2. Izibonelelo ze-4-20mA Iimpawu

Kutheni le nto amashishini ekhetha ukusebenzisa imiqondiso ye-4-20mA? Kolunye, abachaphazeleki kancinci kwingxolo xa kuthelekiswa neempawu zombane. Oku kwenza uthumelo kwimigama emide ngaphandle kokuphazamisa imfezeko yophawu. Ngapha koko, "i-zero ephilayo" kwi-4mA ivumela ukubonwa kwempazamo.

3. Ugqithiselwa njani umqondiso we-4-20mA?

Isignali ye-4-20mA ihanjiswa nge-loop yangoku ye-wire-wire apho enye intambo i-voltage yokubonelela kwaye enye iyindlela yokubuyela kumthombo. Ukwahluka kwangoku ngaphakathi kwilophu kubonisa idatha yesignali.

4. Kodwa yiba neemeko ezithile ekufuneka uziqwalasele:

Into ephazamisekileyo:

①I-Excitation Voltage;

②Ubuncinci boMbane wokuSebenza oVunyiweyo yiTransmitter;

③Ubungakanani be-voltage-ethatha i-resistor esetyenziswa sisixhobo sebhodi ukuqokelela okwangoku;

④Ubungakanani bokumelana nocingo.

Iyakwazi ukubala ngokulula umgama wokuhanjiswa kwethiyori ye-4-20mA yesiginali yangoku.

Ngezi zixa zine ezinxulumeneyo. Phakathi kwazo, i-Uo yi-voltage yokubonelela nge-transmitter,

kwaye kufuneka kuqinisekiswe ukuba Uo ≥ Umin kumthwalo opheleleyo (yangoku I=20mA). Okukuthi: Sebenzisa-I.(RL+2r)≥ Umin.

Ihlala ifuna ukulinganisa ubungakanani bomzimba obungengombane obufana nobushushu, uxinzelelo,

izinga, i-engile njalo njalo kwimizi-mveliso. Zonke kufuneka ziguqulwe zibe yi-analoguezombane

uphawu olutshintshela kulawulo okanye isixhobo sokubonisa kumakhulu ambalwa eemitha kude. Esi sixhobo siyaguquka

ubungakanani bomzimba kwisignali yombane ebizwa ngokuba sisidluliseli. Ukusasaza ubuninzi be-analogue nge

I-4-20 mA yangoku yindlela eqhelekileyo kwimizi-mveliso. Esinye isizathu sokwamkela umqondiso wangoku

kukuba akulula ukuphazamisa kunye nokuchasana okungapheliyo kwangaphakathi komthombo wangoku.

Ukuchasana kocingo kuchungechunge kwi-loop akuchaphazeli ukuchaneka, kwaye kunokuhambisa amakhulu

yeemitha kwisibini esijijekileyo esiqhelekileyo.

4-20mAkubhekiselwa kwimingxuma yangoku njenge-4mA, kwaye ubuninzi bangoku yi-20mA. Ngokusekelwe kwimfuno yobungqina bokudubula,

umda yi-20mA. Amandla entlantsi eninzi kakhulu anokuthi avuthe irhasi enokutsha kunye nesiqhushumbisi, ngoko ke i-20mA yangoku yeyona ifanelekileyo.

Khangela iingcingo ezaphukileyo, kwaye ixabiso elincinci yi-4mA kune-0mA. Xa intambo yothumelo yaphukile ngenxa yempazamo,

i-loop yangoku yehla ukuya ku-0. Sidla ngokuthatha i-2mA njengexabiso le-alam yokuqhawula. Esinye isizathu kukuba i-4-20mA isebenzisa a

inkqubo yocingo ezimbini. Oko kukuthi, iingcingo ezimbini zingumqondiso kunye neengcingo zamandla ngaxeshanye, kwaye i-4mA isetyenziselwa ukubonelela ngokusebenza ngokusisigxina kwesekethe kwinzwa.

Ingaba uMqondiso we-4-20mA unokudluliselwa kude kangakanani?

Into ephazamisekileyo:
①Inxulumene namandla ombane wokuvuselela;

②Inxulumene nobuncinci bombane osebenzayo ovunyelwe sisithumeli;

③Iyayamene nobungakanani besixhobo sokuthatha amandla ombane esisetyenziswa sisixhobo sebhodi ukuqokelela okwangoku;

④Inxulumene nobukhulu bokuxhathisa ucingo.

Iyakwazi ukubala ngokulula umgama wokuhanjiswa kwethiyori ye-4-20mA yesiginali yangoku.

Ngezi zixa zine ezinxulumeneyo. Phakathi kwazo, i-Uo yi-voltage yokubonelela nge-transmitter,

kwaye kufuneka kuqinisekiswe ukuba Uo≥Umin kumthwalo ogcweleyo (yangoku I=20mA). Oko kukuthi: Sebenzisa-I.(RL+2r)≥Umin.

Ngokwale fomyula, ukuxhathisa kwecingo okukhulu kunokubalwa xa i-transmitter ikwi-voltage ephantsi yokusebenza.

Ingcinga: eyaziwayo: Ue=24V，I=20mA，RL=250Ω，Umin=12V。Fumana elona xabiso liphezulu r njenge-175Ω:

Kwaye ke, ngokwendlela yokubala yokumelana nocingo:

Phakathi kwabo:
ρ——Ukuxhathisa(Bronze Resistivity=0.017,Aluminiyam resistivity=0.029)
L——Ubude bentambo (Iyunithi: M)
S——Umgca wecandelo elinqamlezileyo (Iyunithi: imilimitha yesikwere)
Qaphela: Ixabiso lokuchasana lilingana nobude kunye nomlinganiselo ochaseneyo nommandla onqamlezileyo.

Okukhona ucingo lude, kokukhona ukuxhathisa okukhulu; Okukhona ucingo lutyebile, kokukhona ukuxhathisa kusezantsi.

Thatha ucingo lobhedu njengomzekelo, ρ= 0.017 Ω·mm2/m, oko kukuthi: ukuxhathisa kocingo lobhedu.

kunye nommandla we-cross-sectional we-1mm2 kunye nobude be-1m yi-0.017Ω. Emva koko ubude bocingo lwe

175Ω ehambelana ne-1mm2 yi-175/0.017=10294 (m). Kwithiyori, i-4-20mA yokuhanjiswa komqondiso

inokufikelela kumashumi amawaka eemitha (kuxhomekeke kwizinto ezifana novuselelo olwahlukileyo

amandla ombane kunye nowona mbane uphantsi wokusebenza we-transmitter).

I-HENGKO ineminyaka engaphezu kwe-10 ye-OEM/ODM yamava alungiselelweyo kunye nobungcali

uyilo lwentsebenziswano/uncedo lwezakhono zoyilo. Sibonelela nge-4-20mA kunye ne-RS485 imveliso

isivamvo segesi/i-alamu/imodyuli/izinto. I-4-20mA kunye ne-RS485 iqondo lokushisa kunye nokufuma

isivamvo / isidluliseli / probe nazo ziyafumaneka.HENGKO yenzelwe ngokukodwa abathengi

ukuhlangabezana neemfuno zomlinganiselo ofunekayo weenkqubo zoshishino kunye nolawulo lokusingqongileyo.

Kutheni i-4 ukuya kwi-20ma isetyenziselwa ukuhanjiswa koMqondiso kwi-Instrumentation?

Unokujonga njengevidiyo elandelayo ukuze wazi iinkcukacha.

Ukuqukumbela

Umqondiso we-4-20mA ngumgangatho woshishino ngesizathu. Ukukwazi kwayo ukudluliselwa kwimigama emide ngaphandle kokulahlekelwa kokuchaneka kuyinzuzo ephambili. Ngelixa kungekho mpendulo iqinisekileyo yokuba "kude kangakanani" njengoko ixhomekeke kakhulu kwizinto ezifana nokuchasana nocingo, ingxolo yomqondiso, unikezelo lwamandla, kunye nokumelana nomthwalo, kunye nemilinganiselo efanelekileyo endaweni, inokugubungela umgama omde ngokuthembekileyo. Ngokusetyenziswa kwayo okusebenzayo kumashishini kunye neteknoloji ye-sensor, sibona ixabiso kunye nokubaluleka kweempawu ze-4-20mA kwihlabathi lethu elidibeneyo.

Ii-FAQs

1. Yintoni ukubaluleka kwe "zero ephilayo" kwi-4mA kwisignali ye-4-20mA?

I-"live zero" kwi-4mA ivumela ukubonwa kwempazamo. Ukuba isignali iwela ngaphantsi kwe-4mA, ibonisa impazamo, njengokuqhekeka kwiluphu okanye ukusilela kwesixhobo.

2. Kutheni i-4-20mA isignali ingachaphazeleki kancinci kwingxolo?

Iimpawu zangoku azichatshazelwa kangako lutshintsho oluchasayo kunye nengxolo yombane. Yiyo loo nto zikhethwa kuthumelo lomgama omde nakwiindawo ezinengxolo yombane.

3. Yiyiphi indima edlalwa ukuchasana nomthwalo ekuhanjisweni komqondiso we-4-20mA?

Ukumelana nomthwalo kufuneka kuhambelane nokunikezelwa kwamandla. Ukuba ukuxhathisa komthwalo kuphezulu kakhulu, unikezelo lwamandla lusenokungakwazi ukuqhuba i-loop yangoku, ukunciphisa umgama wothumelo.

4. Ngaba uphawu lwe-4-20mA lunokudluliselwa ngaphandle kwamacingo?

Ewe, ngokusetyenziswa kwee-transmitters kunye nabamkeli abayilelwe ngokukodwa le njongo, imiqondiso ye-4-20mA inokuhanjiswa ngaphandle kwamacingo.

5. Ngaba kunokwenzeka ukwandisa umgama wokudluliselwa kwesignali ye-4-20mA?

Ewe, ngokusebenzisa i-wiring efanelekileyo, ukunciphisa ingxolo, ukuqinisekisa ukunikezelwa kwamandla okwaneleyo, kunye nokulinganisa ukuchasana komthwalo, umgama wothumelo unokwandiswa.

Ukuba unomdla wokubakho kweempawu ze-4-20mA kwaye unqwenela ukuphumeza okanye ukwenza ngcono ezo nkqubo kwishishini lakho,

ungalibazisi ukuthatha inyathelo elilandelayo. Ngolwazi oluthe kratya, inkxaso, okanye ukubonisana, fikelela kwiingcali.

Qhagamshelana noHENGKO ngokuka@hengko.comkwaye masifezekise imigama yothumelo elolona luphezulu kunye.