Pochita kuwunikira kosiyanasiyana, titha kuzindikira kuti nthawi zina kutulutsa kwa ma transmitter osiyanitsa kumafunika kusinthidwa kukhala sikweya 4 ~ 20mA siginecha. Kugwiritsa ntchito kotereku kumachitika nthawi zambiri pamakina oyezera mayendedwe a mafakitale pogwiritsa ntchito njira yosiyanitsira yomwe ndi imodzi mwa njira zodziwika bwino zowunikira kuchuluka kwakuyenda. Muyezo wa DP ukawunikiridwa mwachidule, tingathe kumvetsetsa momwe ma transmitter amasiyanitsira amathandizira pakugwira ntchito kwa flowmeter.
Flow metres amagwira ntchito yofunika kwambiri pakuwunika kuchuluka kwa madzimadzi pakati pa maukonde ovuta a mapaipi a mafakitale popereka kuwerenga kwanthawi yake komanso kolondola komwe kumathandizira kuwongolera bwino kwazinthu komanso chitetezo chamagwiritsidwe ntchito. Njira yotsatsira ndi imodzi mwamakina akuluakulu oyezera otaya omwe amaphatikizapo mitundu ya ma flowmeters. Ndiosiyana pamapangidwe koma amagawana zolinga zofananira kuti apange kusiyana kwapang'onopang'ono pakuwerengera komwe kumatengeraEquation ya Bernoulli: Mphamvu zonse zomwe zimakhala ndi kinetic ndi mphamvu zomwe zimatha kutulutsa madzimadzi zimakhalabe nthawi zonse posatengera momwe zilili. Choncho chinthu chachikulu cha DP flowmeters kwenikweni ndi throttling chipangizo (orifice mbale, venturi chubu, pitot chubu, v-cone, etc.) kulenga otaya mathamangitsidwe m'dera gawo, kumabweretsa kutsika hydrostatic kuthamanga madzimadzi.
Apa ndipamene ma transmitter osiyanitsira amayambira. Zinthu zazikuluzikulu zimangokhala zida zamakina, zomwe zimapangitsa kuti pakhale kusiyana kwapakati panjira koma palibe imodzi yomwe imatha kuyeza mtengo wake ndi chizindikiro. Chifukwa chake amafunikira wowathandizira kuti azindikire kuthamanga kwapakati pakati pa mtsinje ndi kunsi kwa mtsinje ndipo pamapeto pake amasinthitsa kukhala chizindikiro cha kuyeza kwamayendedwe -- kumveka ngati ntchito yoyenera kwa ma transmitter osiyanasiyana.
Muyezo wa DP utakhazikitsidwa, funso lingakhale bwanji kupanikizika kosiyana ndi kuchuluka kwa kuthamanga kwa volumetric kungagwirizane? Kutengera Bernoulli's Equation and Continuity Equation, ubale wosagwirizana umakhalapo pakati pa kukakamiza kosiyana (ΔP) ndi kuchuluka kwamadzimadzi (Q):
Q=K√ΔP
Kumene K imayimira chigawo chokhazikika cha mita chomwe chimaganiziridwa ndi zinthu mtundu wa chinthu choyambirira ndi zinthu zina zingapo (kuchuluka kwa madzi, kukula kwa mipope ndi zina zotero). Chizindikiro cha 4 ~ 20mA cha Transmitter sichinali chofananira ndi kuchuluka kwake ndipo sichingathe kuyimira bwino zomwe zikuchitika. Vutoli litha kuthetsedwa mwa kuphatikizika kwa square root extraction (SRE) komwe kumayambira mbadwa za ΔP kupangitsa kuti chizindikiritsocho chikhale chofanana ndi kuchuluka kwa voliyumu kumapeto.
Ngati wotumizirayo sangathe kugwiritsa ntchito SRE mkati, kuwerengera kuyenera kuyendetsedwa ndi makompyuta otuluka kunja kapena makina owongolera omwe angapangitse zovuta komanso zolakwika zomwe zingachitike pamayendedwe azizindikiro. Chifukwa chake ma transmitter amakono a DP nthawi zambiri amakhala ndi chizindikiro cha SRE chokhazikika pamayendedwe a analogi ndipo amatha kutulutsa masikweya 4 ~ 20mA. Kuphatikiza apo, ma transmitter a DP amatha kugwiritsa ntchito otsika otsika kuti achepetse kusuntha kwa sensor komwe kumatha kukulitsidwa mopanda malire pamayendedwe otsika. Ntchito yamapulogalamuyi imakakamiza kutulutsa kwa 4 mA (0% kutuluka) pamene kuyenderera kowerengeka kugwera pansi pazipata zomwe zafotokozedwa kuti zipewe chizindikiro chosokonekera komanso kusokonekera kwabodza.
Njira zoyezera kuthamanga kwamayendedwe osiyanasiyana ndi imodzi mwamaukadaulo otsimikizika komanso otchuka owongolera mafunde. Ngakhale amapereka zabwino kwambiri, palinso malire chifukwa cha kapangidwe kake ndi mfundo:
+ Mapangidwe okhazikika, ukadaulo wokhazikitsidwa bwino
+ Kapangidwe kolimba komanso kolimba, kopanda magawo osuntha
+ Kuwongolera kulondola komanso kukhazikika
- Kutaya kwamphamvu kosatha
- Kuchepetsa kuchepa kwa chiwerengero
- Kumva kusintha kwa kachulukidwe kamadzimadzi ndi zinthu zina
Kusankha flowmeter yoyenera ndikofunikira kuti mugwire bwino ntchito komanso kuyeza kwake kwamadzimadzi. Poganizira mozama zinthu zogwirira ntchito, ogwiritsa ntchito amatha kupanga zisankho zomwe zimagwirizana ndi zofunikira zenizeni.Shanghai Wangyuanwakhala akugwira ntchito yoyesa ndi kuwongolera zida kwa zaka zopitilira 20 kuphatikiza mitundu yonse ya ma flowmeters, ma transmitters ophatikizika ndi zina zoyezera kuthamanga. Ngati muli ndi funso lina kapena zofunikira, chonde musazengereze kutilankhula nafe.
Nthawi yotumiza: Aug-25-2025