4-20mA Chiratidzo Chinogona Kufambiswa Kusvika Sei?

Iyo 4-20mA Chiratidzo Chinogona Kufambiswa Kusvika Papi?

Izvi hazvisi nyore kupa mhinduro mubvunzo, kana zvimwe zvinofurira zvimwe zvinhu zvese zvikafuratirwa, tinogona kufungidzira.

kune yakajairika mamiriro, inogona kuenda anenge 200-500m. Ngatizivei rumwe ruzivo rwekutanga nezve 4-20mA.

1. Chii chinonzi 4-20mA Chiratidzo?

Iyo 4-20mA chiratidzo ndiyo yakajairwa protocol inoshandiswa mumaindasitiri mazhinji. Iyo inzira yekutumira analog chiratidzo data mune maviri-waya ikozvino loop, ichipa yakavimbika nzira yekutaurirana pakati pemidziyo. Makoshero kubva ku4-20mA anowanzo miririra 0 kusvika 100% yechiyero chechiyero.

2. Mabhenefiti e4-20mA Zviratidzo

Sei maindasitiri achifarira kushandisa 4-20mA masaini? Kune imwe, ivo havatani kubatwa neruzha zvichienzaniswa nemagetsi masaini. Izvi zvinogonesa kutapurirana madaro marefu pasina kukanganisa kutendeseka kwechiratidzo. Uyezve, iyo "live zero" pa4mA inobvumira kuona kukanganisa.

3. Chiratidzo che 4-20mA chinofambiswa sei?

Chiratidzo che 4-20mA chinofambiswa kuburikidza ne-two-waya ikozvino loop apo imwe waya ndiyo magetsi ekupa uye imwe inzira yekudzokera kune kwakabva. Ikozvino kusiyanisa mukati meiyo loop inomiririra data rechiratidzo.

4. Asi iva nezvimwe zvinhu zvaunofanira kufunga nezvazvo:

Yakapindira chinhu:

①Excitation Voltage;

②Minimum Operating Voltage Inotenderwa neTransmitter;

③Kukura kweiyo voltage-kutora resistor inoshandiswa nebhodhi mudziyo kuunganidza ikozvino;

④Saizi yekupikisa waya.

Inogona kuverenga zviri nyore iyo theoretical yekufambisa kureba ye4-20mA ikozvino chiratidzo.

Kuburikidza nezvikamu zvina izvi zvinoenderana. Pakati pavo, Uo ndiyo magetsi ekupa iyo transmitter,

uye inofanira kuve nechokwadi kuti Uo ≥ Umin pakazara mutoro (ikozvino I = 20mA). Zvinonzi: Shandisa-I.(RL+2r)≥ Umin.

Inowanzoda kuyera zvakasiyana-siyana zvisiri zvemagetsi zvemuviri senge tembiricha, kudzvanywa,

chiyero, kona uye zvichingodaro mumaindasitiri. Zvose zvinoda kushandurwa kuita analoguezvemagetsi

chiratidzo chinoenda kune chinodzora kana kuratidza mudziyo uri mazana mashoma emamita kure. Chishandiso ichi chinoshandura

huwandu hwemuviri muchiratidzo chemagetsi chinonzi transmitter. Kuendesa huwandu hweanalogue ne

4-20 mA ikozvino ndiyo nzira yakajairika muindasitiri. Chimwe chikonzero chekutora chiratidzo chazvino

ndeyekuti hazvisi nyore kupindira uye kusagadzikana kwemukati kupikisa kwezvino.

Kupokana kwewaya munhevedzano muchiuno hakukanganise iko kurongeka, uye inogona kuendesa mazana.

yemamita pane akajairwa akamonyoroka peya.

4-20mAinotaurwa kune iyo min ikozvino se4mA, uye iyo max ikozvino ndeye 20mA. Zvichienderana nezvinodiwa kuputika,

iyo inogumira ndeye 20mA. Simba rakawandisa rinogona kubatidza gasi rinopfuta uye rinoputika, saka 20mA iripo ndiyo inonyanya kukodzera.

Wona waya dzakatyoka, uye hushoma kukosha ndeye 4mA kwete 0mA. Kana tambo yekutumira yaputswa nekuda kwekukanganisa,

iyo loop ikozvino inodonha kusvika ku 0. Isu tinowanzo tora 2mA sechinhu chekubvisa alarm kukosha. Chimwe chikonzero ndechekuti iyo 4-20mA inoshandisa a

maviri-waya system. Ndiko kuti, waya mbiri idzi chiratidzo uye waya dzemagetsi panguva imwe chete, uye 4mA inoshandiswa kupa iyo static inoshanda ikozvino yedunhu kune sensor.

Iyo 4-20mA Chiratidzo Chinogona Kufambiswa Kusvika Papi?

Yakapindira chinhu:
①Inoenderana neiyo excitation voltage;

②Inoenderana nehushoma hwekushandisa voltage inotenderwa neanotumira;

③Inoenderana nehukuru hweiyo voltage-inotora resistor inoshandiswa nebhodhi mudziyo kuunganidza ikozvino;

④Inoenderana nehukuru hwekupokana newaya.

Inogona kuverenga zviri nyore iyo theoretical yekufambisa kureba ye4-20mA ikozvino chiratidzo.

Kuburikidza nezvikamu zvina izvi zvinoenderana. Pakati pavo, Uo ndiyo magetsi ekupa iyo transmitter,

uye inofanirwa kuve nechokwadi kuti Uo≥Umin yakazara yakazara (ikozvino I=20mA). Zvinonzi: Shandisa-I.(RL+2r)≥Umin.

Zvinoenderana neiyi fomula, iyo yakakura kupikisa waya inogona kuverengerwa kana iyo transmitter iri pane yakaderera inoshanda voltage.

Hypothesis: inozivikanwa: Ue = 24V，I = 20mA，RL=250Ω，Umin=12V。Tsvaga kukosha kukuru kweR se175Ω:

Uye zvino, maererano nekuverenga fomula yekupikisa waya:

Pakati pavo:
ρ——Resistivity(Bronze Resistivity=0.017,Aluminium resistivity=0.029)
L——Kureba kwetambo (Uniti: M)
S——Mutsetse wechikamu-chepakati (Uniti: Square millimeter)
Ongorora: Iko kukosha kwekupokana kunoenderana nehurefu uye inversely proportional kune mhiri-chikamu nzvimbo.

Iyo yakareba waya, iyo inowedzera kuramba; iyo yakakora waya, iyo yakaderera kushorwa.

Tora waya yemhangura semuenzaniso, ρ= 0.017 Ω·mm2/m, kureva: kuramba kwewaya yemhangura.

ine mhiri-chikamu nzvimbo ye1mm2 uye kureba kwe1m ndeye 0.017Ω. Zvadaro waya kureba kwe

175Ω inoenderana ne1mm2 ndeye 175/0.017=10294 (m). Mukufungidzira, 4-20mA chiratidzo chekufambisa

inogona kusvika makumi ezviuru zvemamita (zvichienderana nezvinhu zvakaita sekunakidzwa kwakasiyana

voltages uye yakaderera kushanda voltage yetransmitter).

HENGKO ane anopfuura makore gumi eOEM/ODM akagadziridzwa ruzivo uye nyanzvi

kudyidzana dhizaini / kubatsira dhizaini kugona. Isu tinopa 4-20mA uye RS485 kuburitsa

gasi sensor/alarm/module/elements. Iyo 4-20mA uye RS485 yekubuda tembiricha uye humidity

sensor/transmitter/probe inowanikwawo.HENGKO yakanyatsogadzirirwa vatengi kuti

kusangana nezvinodiwa kuyerwa zvinodiwa zvemaindasitiri maitiro uye kutonga kwezvakatipoteredza.

Sei 4 kusvika 20ma ichishandiswa kuSignal Transmission muInstrumentation?

Iwe unogona kutarisa sekutevera vhidhiyo kuti uzive ruzivo.

Mhedziso

Iyo 4-20mA chiratidzo iindasitiri-yakajairwa nechikonzero. Kugona kwayo kupfuudzwa pamusoro pemadaro marefu pasina kurasikirwa kwechokwadi ndiyo yakakosha mukana. Kunyange pasina mhinduro chaiyo yekuti "kusvika kupi" sezvo zvakanyanya zvinoenderana nezvinhu zvakaita senge waya, ruzha rwechiratidzo, magetsi uye kuramba mutoro, nematanho akakodzera munzvimbo, inogona kuvharika madaro akareba. Kuburikidza nekushandisa kwayo kunoshanda mumaindasitiri uye sensor tekinoroji, tinoona kukosha uye kukosha kwe4-20mA masaini munyika yedu yakabatana.

FAQs

1. Chii chakakosha che "live zero" pa4mA mune 4-20mA chiratidzo?

Iyo "live zero" pa4mA inobvumira kuona kukanganisa. Kana chiratidzo chikawira pasi pe4mA, inoratidza kukanganisa, senge kutyora muchiuno kana kutadza kwechishandiso.

2. Sei chiratidzo che4-20mA chisinganyanyi kubatwa neruzha?

Ikozvino masaini haanyanyi kukanganiswa nekuchinja shanduko uye ruzha rwemagetsi. Ichi ndicho chikonzero ivo vanofarirwa kutapurirana kure-kure uye munzvimbo dzine ruzha rwemagetsi.

3. Ndeipi basa rinoitwa nekudzivirira kwekutakura mukufambiswa kwechiratidzo che 4-20mA?

Kuremerwa kwemutoro kunofanira kufanana nemagetsi. Kana mutoro wekupikisa wakanyanya kukwirira, magetsi anogona kusakwanisa kutyaira loop ikozvino, ichidzikamisa kuremerwa kwekufambisa.

4. Chiratidzo che 4-20mA chinogona kufambiswa pasina waya here?

Ehe, nekushandiswa kwevanotapurirana uye vanogashira zvakagadzirirwa chinangwa ichi, 4-20mA masaini anogona kufambiswa pasina waya.

5. Zvinokwanisika here kuwedzera kureba kwekufambisa kwechiratidzo che 4-20mA?

Hongu, nekushandisa waya wakakodzera, kuderedza ruzha, kuve nechokwadi chekupihwa kwemagetsi akakwana, uye kuyera kuremerwa kwemutoro, kureba kwekufambisa kunogona kuwedzerwa.

Kana iwe uchinakidzwa nekugona kwe4-20mA masaini uye uchishuvira kuita kana kukwirisa masisitimu akadaro muindasitiri yako,

usazeze kutora danho rinotevera. Kuti uwane rumwe ruzivo, rutsigiro, kana kubvunza, svika kune nyanzvi.

Bata HENGKO izvozvi paka@hengko.comuye ngatiwanei akanyanya kutapurirana madaro pamwechete.