Kodi kutulutsa kwa 4-20mA ndi chiyani?
1.) Chiyambi
4-20mA (milliamp) ndi mtundu wamagetsi wamakono womwe umagwiritsidwa ntchito popereka ma analogi mumayendedwe amakampani ndi makina ongogwiritsa ntchito.Ndi njira yodzipangira yokha, yotsika kwambiri yomwe imatha kutumiza zidziwitso pamtunda wautali komanso kudzera m'malo aphokoso amagetsi popanda kuwononga kwambiri chizindikirocho.
Mtundu wa 4-20mA umayimira kutalika kwa 16 milliamp, ndi ma milliamp anayi omwe amaimira mtengo wocheperako kapena zero wa chizindikiro ndi 20 milliamp kuyimira kuchuluka kapena kuchuluka kwa sikelo.Mtengo weniweni wa siginecha ya analogi yomwe ikutumizidwa imasungidwa ngati malo mkati mwamtunduwu, pomwe mulingo wapano ukugwirizana ndi mtengo wa chizindikirocho.
Kutulutsa kwa 4-20mA nthawi zambiri kumagwiritsidwa ntchito potumiza ma analogi kuchokera ku masensa ndi zida zina zakumunda, monga ma probe kutentha ndi ma transducers okakamiza, kuwongolera ndikuwunika machitidwe.Amagwiritsidwanso ntchito kutumiza zizindikiro pakati pa zigawo zosiyanasiyana mkati mwa dongosolo lolamulira, monga kuchokera ku pulogalamu ya logic controller (PLC) kupita ku valve actuator.
Mu makina opanga mafakitale, kutulutsa kwa 4-20mA ndi chizindikiro chomwe chimagwiritsidwa ntchito nthawi zambiri potumiza zidziwitso kuchokera ku masensa ndi zida zina.Kutulutsa kwa 4-20mA, komwe kumadziwikanso kuti loop yapano, ndi njira yolimba komanso yodalirika yotumizira deta mtunda wautali, ngakhale m'malo aphokoso.Cholemba ichi chabulogu chiwunika zoyambira za 4-20mA, kuphatikiza momwe zimagwirira ntchito komanso zabwino ndi zoyipa zogwiritsa ntchito pamakina opanga makina.
Kutulutsa kwa 4-20mA ndi chizindikiro cha analogi chomwe chimatumizidwa pogwiritsa ntchito mphamvu ya 4-20 milliamp (mA).Nthawi zambiri amagwiritsidwa ntchito popereka chidziwitso chokhudza kuyeza kuchuluka kwa thupi, monga kuthamanga, kutentha, kapena kuthamanga.Mwachitsanzo, sensa ya kutentha imatha kufalitsa chizindikiro cha 4-20mA molingana ndi kutentha komwe imayesa.
Ubwino umodzi wogwiritsa ntchito 4-20mA ndikuti ndi muyezo wapadziko lonse lapansi wama automation amakampani.Zikutanthauza kuti zipangizo zosiyanasiyana, monga masensa, olamulira, ndi ma actuators, amapangidwa kuti azigwirizana ndi zizindikiro za 4-20mA.Zimapangitsa kuphatikiza zida zatsopano pamakina omwe alipo mosavuta, bola ngati amathandizira kutulutsa kwa 4-20mA.
2.）Kodi 4-20mA imagwira ntchito bwanji?
Kutulutsa kwa 4-20mA kumafalitsidwa pogwiritsa ntchito loop yapano, yomwe imakhala ndi chotumizira ndi cholandila.Chotumizira, nthawi zambiri sensa kapena chipangizo china choyeza kuchuluka kwa thupi, chimapanga chizindikiro cha 4-20mA ndikuchitumiza kwa wolandira.Wolandirayo, yemwe nthawi zambiri amakhala woyang'anira kapena chipangizo china chomwe chimayang'anira chizindikirocho, chimalandira chizindikiro cha 4-20mA ndikumasulira zomwe zili.
Kuti chizindikiro cha 4-20mA chifalikire molondola, ndikofunikira kusunga nthawi zonse kudzera mu lupu.Zimatheka pogwiritsa ntchito choponderetsa chamakono mu transmitter, chomwe chimachepetsa kuchuluka kwazomwe zimatha kuyenda mozungulira.Kukaniza kwaposachedwa kwaposachedwa kumasankhidwa kuti alole mtundu womwe ukufunidwa wa 4-20mA kuyenda mu lupu.
Chimodzi mwamaubwino ogwiritsira ntchito lupu yamakono ndikuti chimalola kuti chizindikiro cha 4-20mA chitumizidwe pamtunda wautali popanda kuvutika ndi kuwonongeka kwa chizindikiro.Ndi chifukwa chakuti chizindikirocho chimafalitsidwa ngati chamakono m'malo mwa voteji, chomwe sichikhoza kusokonezedwa ndi phokoso.Kuphatikiza apo, malupu apano amatha kufalitsa chizindikiro cha 4-20mA pazingwe zopotoka kapena zingwe za coaxial, kuchepetsa chiwopsezo chakuwonongeka kwa ma sign.
3.） Ubwino wogwiritsa ntchito 4-20mA linanena bungwe
Pali maubwino angapo ogwiritsira ntchito 4-20mA kutulutsa mumakina opanga makina.Zina mwazabwino zake ndi izi:
Kutumiza kwa ma siginali azitali:Kutulutsa kwa 4-20mA kumatha kutumiza ma siginecha mtunda wautali popanda kuvutitsidwa ndi kuwonongeka kwa ma sign.Ndizoyenera kugwiritsidwa ntchito m'malo omwe makina otumizira ndi olandila amakhala otalikirana, monga m'mafakitale akuluakulu kapena zida zamafuta zakunyanja.
A: Kutetezedwa kwa phokoso lalikulu:Malupu amakono amalimbana kwambiri ndi phokoso ndi kusokonezedwa, zomwe zimawapangitsa kukhala abwino kugwiritsidwa ntchito m'malo aphokoso.Ndikofunikira makamaka m'mafakitale, pomwe phokoso lamagetsi kuchokera ku ma motors ndi zida zina zingayambitse mavuto ndi kufalitsa ma siginecha.
B: Kugwirizana ndi zida zingapo:Monga kutulutsa kwa 4-20mA ndi muyezo wapadziko lonse lapansi wama automation wa mafakitale, imagwirizana ndi zida zambiri.Zimapangitsa kuphatikiza zida zatsopano pamakina omwe alipo mosavuta, bola ngati amathandizira kutulutsa kwa 4-20mA.
4.) Kuipa kogwiritsa ntchito 4-20mA linanena bungwe
Ngakhale kutulutsa kwa 4-20mA kuli ndi zabwino zambiri, palinso zovuta zina pakuzigwiritsa ntchito pamakina opanga makina.Izi zikuphatikizapo:
A: Kusamvana kochepa:Kutulutsa kwa 4-20mA ndi chizindikiro cha analogi chomwe chimatumizidwa pogwiritsa ntchito mitundu ingapo.Komabe, kusamvana kwa chizindikiro kumachepa ndi 4-20mA, yomwe ili 16mA yokha.Izi sizingakhale zokwanira pazogwiritsa ntchito zomwe zimafuna kulondola kwambiri kapena kukhudzidwa.
B: Kudalira magetsi:Kuti chizindikiro cha 4-20mA chifalikire molondola, ndikofunikira kusunga nthawi zonse kudzera mu lupu.Izi zimafuna magetsi, omwe angakhale owonjezera mtengo ndi zovuta mu dongosolo.Kuphatikiza apo, magetsi amatha kulephera kapena kusokonezeka, zomwe zingakhudze kufalikira kwa chizindikiro cha 4-20mA.
5.) Mapeto
Kutulutsa kwa 4-20mA ndi mtundu womwe umagwiritsidwa ntchito kwambiri pamakina opanga makina.Imafalikira pogwiritsa ntchito mphamvu ya 4-20mA ndipo imalandiridwa pogwiritsa ntchito loop yapano yomwe ili ndi cholumikizira ndi cholandila.Kutulutsa kwa 4-20mA kuli ndi maubwino angapo, kuphatikiza kufalitsa ma siginecha atalitali, chitetezo chokwanira chaphokoso, komanso kugwirizana ndi zida zambiri.Komabe, ilinso ndi zovuta zina, kuphatikizapo kusamvana kochepa komanso kudalira magetsi.Ponseponse, kutulutsa kwa 4-20mA ndi njira yodalirika komanso yolimba yotumizira deta mumakina opanga makina.
Kodi Pali Kusiyana Kotani Pakati pa 4-20ma, 0-10v, 0-5v, ndi I2C Output?
4-20mA, 0-10V, ndi 0-5V zonse ndi zizindikiro za analogi zomwe zimagwiritsidwa ntchito popanga mafakitale ndi ntchito zina.Amagwiritsidwa ntchito kufalitsa zambiri za kuyeza kuchuluka kwa thupi, monga kuthamanga, kutentha, kapena kuthamanga kwa magazi.
Kusiyanitsa kwakukulu pakati pa mitundu iyi yazizindikiro ndi kuchuluka kwa zikhalidwe zomwe zimatha kutumiza.Zizindikiro za 4-20mA zimatumizidwa pogwiritsa ntchito mphamvu ya 4-20 milliamp, zizindikiro za 0-10V zimatumizidwa pogwiritsa ntchito magetsi oyambira 0 mpaka 10 volts, ndipo zizindikiro za 0-5V zimatumizidwa pogwiritsa ntchito mphamvu yochokera ku 0 mpaka 5 volts.
I2C (Inter-Integrated Circuit) ndi njira yolumikizirana ya digito yomwe imagwiritsidwa ntchito potumiza deta pakati pa zida.Amagwiritsidwa ntchito kwambiri pamakina ophatikizidwa ndi mapulogalamu ena pomwe zida zambiri zimafunikira kulumikizana wina ndi mnzake.Mosiyana ndi ma siginecha a analogi, omwe amatumiza zidziwitsozo ngati kuchuluka kosalekeza kwamitengo, I2C imagwiritsa ntchito ma pulse adijito kufalitsa deta.
Iliyonse mwa mitundu iyi yazizindikiro ili ndi zabwino zake ndi zovuta zake, ndipo kusankha kwabwino kumatengera zofunikira za pulogalamuyo.Mwachitsanzo, ma siginecha a 4-20mA nthawi zambiri amawakonda potumiza ma siginecha akutali komanso chitetezo champhamvu chaphokoso, pomwe ma siginecha a 0-10V ndi 0-5V atha kupereka kusamvana kwakukulu komanso kulondola kwabwinoko.I2C nthawi zambiri imagwiritsidwa ntchito polumikizirana mtunda waufupi pakati pa zida zazing'ono.
1. Zosiyanasiyana:Zizindikiro za 4-20mA zimatumiza magetsi oyambira 4 mpaka 20 mamilimita, ma siginecha a 0-10V amatumiza voteji kuyambira 0 mpaka 10 volts, ndipo ma siginecha a 0-5V amatumiza voteji kuyambira 0 mpaka 5 volts.I2C ndi njira yolankhulirana ya digito ndipo simatumiza zikhalidwe zopitilira.
2. Kutumiza kwa siginecha:Zizindikiro za 4-20mA ndi 0-10V zimafalitsidwa pogwiritsa ntchito lupu yamakono kapena magetsi, motsatira.Zizindikiro za 0-5V zimatumizidwanso pogwiritsa ntchito magetsi.I2C imafalitsidwa pogwiritsa ntchito ma pulses a digito.
3. Kugwirizana:Zizindikiro za 4-20mA, 0-10V, ndi 0-5V nthawi zambiri zimagwirizana ndi zida zambiri, chifukwa zimagwiritsidwa ntchito kwambiri popanga mafakitale ndi ntchito zina.I2C imagwiritsidwa ntchito makamaka pamakina ophatikizidwa ndi mapulogalamu ena pomwe zida zambiri zimafunikira kulumikizana wina ndi mnzake.
4. Kusamvana:Zizindikiro za 4-20mA zimakhala ndi malire ochepa chifukwa cha zochepa zomwe zingathe kufalitsa (16mA yokha).0-10V ndi 0-5V ma siginecha atha kupereka kusamvana kwakukulu komanso kulondola kwabwinoko, kutengera zomwe pulogalamuyo ikufuna.I2C ndi ndondomeko ya digito ndipo ilibe chigamulo mofanana ndi zizindikiro za analogi.
5. Kutetezedwa kwa phokoso:Zizindikiro za 4-20mA zimagonjetsedwa kwambiri ndi phokoso ndi kusokonezedwa chifukwa chogwiritsa ntchito lupu lamakono potumiza ma siginecha.0-10V ndi 0-5V ma siginecha amatha kutengeka mosavuta ndi phokoso, kutengera kukhazikitsidwa kwake.I2C nthawi zambiri imakhala yosamva phokoso chifukwa imagwiritsa ntchito ma pulse a digito potumiza ma siginecha.
Ndi iti yomwe imagwiritsidwa ntchito kwambiri?
Ndi njira iti yabwino yotulutsa kutentha ndi chinyezi?
Ndizovuta kunena kuti ndi njira iti yotulutsa yomwe imagwiritsidwa ntchito kwambiri potengera kutentha ndi chinyezi, chifukwa zimatengera momwe makinawo amagwirira ntchito komanso zofunikira zake.Komabe, 4-20mA ndi 0-10V amagwiritsidwa ntchito kwambiri popereka miyeso ya kutentha ndi chinyezi muzochita zamafakitale ndi ntchito zina.
4-20mA ndi chisankho chodziwika bwino cha ma transmitters a kutentha ndi chinyezi chifukwa cha kulimba kwake komanso kuthekera kwake kotumizira mtunda wautali.Imalimbananso ndi phokoso komanso kusokoneza, zomwe zimapangitsa kuti ikhale yoyenera kugwiritsidwa ntchito m'malo aphokoso.
0-10V ndi njira ina yomwe imagwiritsidwa ntchito kwambiri potengera kutentha ndi chinyezi.Imapereka kusintha kwakukulu komanso kulondola kwabwinoko kuposa 4-20mA, yomwe ingakhale yofunika pamapulogalamu omwe amafunikira kulondola kwambiri.
Pamapeto pake, njira yabwino kwambiri yopangira chotengera kutentha ndi chinyezi itengera zomwe pulogalamuyo ikufuna.Zinthu za mtunda wapakati pa chotumizira ndi cholandila, kuchuluka kwa kulondola ndi kukonza kofunikira, komanso malo ogwirira ntchito (mwachitsanzo, kukhalapo kwa phokoso ndi kusokoneza).
Kodi Kugwiritsa Ntchito Kwambiri kwa 4-20mA Output ndi Chiyani?
Kutulutsa kwa 4-20mA kumagwiritsidwa ntchito kwambiri pamakina opanga mafakitale ndi ntchito zina chifukwa cha kulimba kwake komanso kuthekera kotumiza mtunda wautali.Ntchito zina zodziwika bwino za 4-20mA zikuphatikizapo:
1. Kuwongolera Njira:4-20mA nthawi zambiri imagwiritsidwa ntchito kufalitsa zosintha zamayendedwe, monga kutentha, kupanikizika, ndi kuthamanga kwamayendedwe, kuchokera ku masensa kupita kwa owongolera mumayendedwe owongolera.
2. Zida Zamakampani:4-20mA imagwiritsidwa ntchito potumiza deta yoyezera kuchokera ku zida zamafakitale, monga ma flow metre ndi masensa amtundu, kupita kwa owongolera kapena zowonetsera.
3. Kupanga Zodzichitira:4-20mA imagwiritsidwa ntchito pomanga makina opangira makina kuti atumize zambiri za kutentha, chinyezi, ndi zina zachilengedwe kuchokera ku masensa kupita kwa owongolera.
4. Kupanga Mphamvu:4-20mA imagwiritsidwa ntchito m'mafakitale opanga magetsi kuti atumize deta yoyezera kuchokera ku masensa ndi zida kupita kwa olamulira ndi zowonetsera.
5. Mafuta ndi Gasi:4-20mA imagwiritsidwa ntchito kwambiri m'makampani amafuta ndi gasi kuti atumize deta yoyezera kuchokera ku masensa ndi zida pamapulatifomu ndi mapaipi akunyanja.
6. Kusamalira Madzi ndi Madzi Otayira:4-20mA imagwiritsidwa ntchito m'mafakitale opangira madzi ndi madzi oyipa kuti atumize deta yoyezera kuchokera ku masensa ndi zida kupita kwa owongolera ndi mawonetsero.
7. Chakudya ndi Chakumwa:4-20mA imagwiritsidwa ntchito m'makampani azakudya ndi zakumwa kuti atumize deta yoyezera kuchokera ku masensa ndi zida kupita kwa olamulira ndi zowonetsera.
8. Zagalimoto:4-20mA imagwiritsidwa ntchito m'makampani opanga magalimoto kuti atumize deta yoyezera kuchokera ku masensa ndi zida kupita kwa olamulira ndi zowonetsera.
Kodi mukufuna kudziwa zambiri za 4-20 kutentha ndi chinyezi chotumizira?Lumikizanani nafe kudzera pa imeloka@hengko.comkuti mafunso anu onse ayankhidwe komanso kuti mumve zambiri za malonda athu.Tabwera kukuthandizani kuti mupange chisankho chabwino kwambiri pazosowa zanu.Osazengereza kutifikira - tikuyembekezera kumva kuchokera kwa inu!
Nthawi yotumiza: Jan-04-2023
