Kodi 4-20mA Signal Ingafatsitsidwe Mpaka Pati?

Kodi Chizindikiro cha 4-20mA Chingatumizidwe Mpaka Pati?

Izi sizophweka kuyankha funso, ngati zina zomwe zimakhudza zinthu zina zonse zimanyalanyazidwa, titha kuyerekeza.

pazikhalidwe zake zonse, imatha kupita pafupifupi 200-500m. Tidziwe zambiri za 4-20mA.

1. Kodi Chizindikiro cha 4-20mA ndi chiyani?

Chizindikiro cha 4-20mA ndi protocol yokhazikika yomwe imagwiritsidwa ntchito m'mafakitale ambiri. Ndi njira yotumizira deta ya chizindikiro cha analogi muzitsulo ziwiri zamakono zamakono, kupereka njira yodalirika yolankhulirana pakati pa zipangizo. Miyezo yochokera ku 4-20mA nthawi zambiri imayimira 0 mpaka 100% ya miyeso.

2. Ubwino wa Zizindikiro za 4-20mA

Chifukwa chiyani mafakitale amakonda kugwiritsa ntchito ma siginecha a 4-20mA? Chifukwa chimodzi, sagwidwa ndi phokoso poyerekeza ndi ma siginecha amagetsi. Izi zimathandiza kufalikira kwa mtunda wautali popanda kusokoneza kukhulupirika kwa chizindikiro. Kuphatikiza apo, "live zero" pa 4mA imalola kuzindikira zolakwika.

3. Kodi Chizindikiro cha 4-20mA chimafalitsidwa bwanji?

Chizindikiro cha 4-20mA chimaperekedwa kudzera muzitsulo ziwiri zamakono zomwe waya wina ndi magetsi operekera ndipo winayo ndi njira yobwerera ku gwero. Kusiyanasiyana kwamakono mkati mwa loop kumayimira deta ya chizindikiro.

4. Koma khalani ndi zinthu zina zomwe muyenera kuziganizira:

Chinthu chosokoneza:

①Mphamvu yamagetsi;

②Ochepa Operating Voltage Amaloledwa ndi Transmitter;

③Kukula kwa voliyumu-kutenga resistor yomwe imagwiritsidwa ntchito ndi chipangizo cha board kusonkhanitsa zamakono;

④Kukula kwa kukana waya.

Itha kuwerengera mosavuta mtunda wapakatikati wa 4-20mA chizindikiro chapano.

Kupyolera mu zinayi zokhudzana zedi. Zina mwa izo, Uo ndi mphamvu yamagetsi ya transmitter,

ndipo ziyenera kutsimikiziridwa kuti Uo ≥ Umin pa katundu wathunthu (panopa I = 20mA). Dzina lake: Gwiritsani-I.(RL+2r)≥ Umin.

Nthawi zambiri imafunika kuyeza mitundu yosiyanasiyana yopanda magetsi monga kutentha, kuthamanga,

mlingo, ngodya ndi zina zotero mu mafakitale. Zonsezi ziyenera kusinthidwa kukhala analogizamagetsi

chizindikiro chomwe chimasamutsira ku chipangizo chowongolera kapena chowonetsera chomwe chili pamtunda wa mita mazana angapo. Chipangizochi chimatembenuka

kuchuluka kwa thupi mu chizindikiro chamagetsi chotchedwa transmitter. Kutumiza kuchuluka kwa analogi ndi

4-20 mA panopa ndi njira yofala kwambiri m'mafakitale. Chifukwa chimodzi chotengera chizindikiro chapano

ndikuti sikophweka kusokoneza komanso kukana kwamkati kosatha kwa gwero lamakono.

Kukaniza kwa waya motsatizana mu loop sikukhudza kulondola, ndipo kumatha kufalitsa mazana.

wa mamita pa awiri wopotoka wamba.

4-20mAotchedwa min current monga 4mA, ndipo max current ndi 20mA. Kutengera kufunikira koletsa kuphulika,

malire ndi 20mA. Mphamvu yamphamvu yochulukirapo imatha kuyatsa mpweya woyaka komanso wophulika, kotero kuti 20mA yapano ndiyoyenera kwambiri.

Dziwani mawaya osweka, ndipo mtengo wocheperako ndi 4mA osati 0mA. Chingwe chotumizira chikaduka chifukwa cha vuto,

kutsika kwaposachedwa kumatsikira ku 0. Nthawi zambiri timatenga 2mA ngati mtengo wa alamu wodula. Chifukwa china ndikuti 4-20mA imagwiritsa ntchito a

awiri waya dongosolo. Ndiko kuti, mawaya awiriwa ndi chizindikiro ndi mawaya amphamvu panthawi imodzi, ndipo 4mA imagwiritsidwa ntchito popereka mphamvu yogwira ntchito ya dera ku sensa.

Kodi Chizindikiro cha 4-20mA Chingatumizidwe Mpaka Pati?

Chinthu chosokoneza:
① Zogwirizana ndi mphamvu yamagetsi;

②Zogwirizana ndi magetsi ochepa omwe amaloledwa ndi transmitter;

③Zogwirizana ndi kukula kwa chopinga chotengera voteji chomwe chimagwiritsidwa ntchito ndi chipangizo cha board kusonkhanitsa pano;

④Zogwirizana ndi kukula kwa kukana waya.

Itha kuwerengera mosavuta mtunda wapakatikati wa 4-20mA chizindikiro chapano.

Kupyolera mu zinayi zokhudzana zedi. Zina mwa izo, Uo ndi mphamvu yamagetsi ya transmitter,

ndipo ziyenera kutsimikiziridwa kuti Uo≥Umin yodzaza (panopa I=20mA). Dzina lake: Gwiritsani-I.(RL+2r)≥Umin.

Malinga ndi chilinganizo ichi, kukana kwakukulu kwa waya kumatha kuwerengedwa ngati chotumiziracho chili pamagetsi otsika.

Malingaliro: odziwika: Ue = 24V，I=20mA，RL=250Ω，Umin=12V。Pezani mtengo wapamwamba wa r monga 175Ω:

Ndiyeno, molingana ndi chilinganizo chowerengera cha kukana waya:

Mwa iwo:
ρ——Resistivity(Bronze Resistivity=0.017,Aluminium resistivity=0.029)
L——Utali wa chingwe (Chigawo: M)
S——Mzere wa mphambano (Chigawo: millimita lalikulu)
Zindikirani: Mtengo wotsutsa ndi wofanana ndi kutalika kwake komanso mosiyana ndi gawo la magawo.

Kutalikira kwa waya, kumawonjezera kukana; kukhuthala kwa waya, kumachepetsa kukana.

Tengani waya wamkuwa monga chitsanzo, ρ= 0.017 Ω·mm2/m, ndiko: kukana kwa waya wamkuwa

yokhala ndi gawo la 1mm2 ndi kutalika kwa 1m ndi 0.017Ω. Kenako waya kutalika kwa

175Ω yogwirizana ndi 1mm2 ndi 175/0.017=10294 (m). Mwachidziwitso, 4-20mA kufalitsa chizindikiro

imatha kufika makumi masauzande a mita (kutengera zinthu monga chisangalalo chosiyana

ma voltages ndi voteji yotsika kwambiri ya transmitter).

HENGKO ali ndi zaka zoposa 10 za OEM/ODM makonda ndi luso

Mapangidwe othandizira / luso lothandizira. Timapereka 4-20mA ndi RS485 zotulutsa

sensa ya gasi/alarm/module/elements. The 4-20mA ndi RS485 linanena bungwe kutentha ndi chinyezi

sensa/transmitter/probe ziliponso.HENGKO imapangidwa mwapadera kuti makasitomala azitha

kukwaniritsa zofunikira za kuyeza kwa mafakitale ndi kayendetsedwe ka chilengedwe.

Chifukwa chiyani 4 mpaka 20ma imagwiritsidwa ntchito potumiza ma Signal mu Instrumentation?

Mukhoza onani monga kutsatira kanema kudziwa zambiri.

Mapeto

Chizindikiro cha 4-20mA ndi muyezo wamakampani pazifukwa. Kuthekera kwake kupatsirana mtunda wautali popanda kutayika molondola ndi mwayi waukulu. Ngakhale palibe yankho lotsimikizika la "kutalika bwanji" chifukwa zimatengera kwambiri zinthu monga kukana waya, phokoso lazizindikiro, magetsi, ndi kukana katundu, ndi miyeso yoyenera, imatha kuyenda mtunda wautali. Kupyolera mu ntchito yake yothandiza m'mafakitale ndi teknoloji ya sensa, timawona kufunika ndi kufunikira kwa zizindikiro za 4-20mA m'dziko lathu lolumikizana.

FAQs

1. Kodi kufunikira kwa "live zero" pa 4mA mu chizindikiro cha 4-20mA ndi chiyani?

"Live zero" pa 4mA imalola kuzindikira zolakwika. Ngati chizindikiro chikugwera pansi pa 4mA, chimasonyeza cholakwika, monga kuphulika kwa loop kapena kulephera kwa chipangizo.

2. Chifukwa chiyani siginecha ya 4-20mA imakhala yosavuta kumva phokoso?

Zizindikiro zamakono sizikhudzidwa kwambiri ndi kusintha kwa mphamvu ndi phokoso lamagetsi. Ichi ndichifukwa chake amawakonda kuti azitumiza mtunda wautali komanso m'malo aphokoso amagetsi.

3. Kodi kukana katundu kumagwira ntchito yotani potumiza chizindikiro cha 4-20mA?

Kukana kwa katundu kuyenera kufanana ndi magetsi. Ngati kukana kwa katundu ndikokwera kwambiri, magetsi sangayendetse kuzungulira, ndikuchepetsa mtunda wotumizira.

4. Kodi chizindikiro cha 4-20mA chingatumizidwe popanda zingwe?

Inde, pogwiritsa ntchito ma transmitters ndi olandila omwe adapangidwira izi, ma siginecha a 4-20mA amatha kufalitsidwa popanda zingwe.

5. Kodi n'zotheka kuwonjezera mtunda wotumizira chizindikiro cha 4-20mA?

Inde, pogwiritsa ntchito mawaya oyenerera, kuchepetsa phokoso, kuonetsetsa kuti magetsi ali ndi mphamvu zokwanira, ndi kusakanitsa katundu, mtunda wotumizira ukhoza kufalikira.

Ngati mukuchita chidwi ndi kuthekera kwa ma siginecha a 4-20mA ndipo mukufuna kukhazikitsa kapena kukhathamiritsa makina otere mumakampani anu,

musazengereze kutenga sitepe yotsatira. Kuti mudziwe zambiri, chithandizo, kapena kufunsira, fikirani akatswiri.

Lumikizanani ndi HENGKO tsopano paka@hengko.comndipo tiyeni tikwaniritse mtunda woyenera wotumizira limodzi.