Ekuqapheni ingcindezi ehlukene, singabona ukuthi ngezinye izikhathi ukuphuma kwe-transmitter yengcindezi ehlukene kuyadingeka ukuthi kucutshungulwe kube isignali yesikwele esingu-4 ~ 20mA. Ukusetshenziswa okunjalo kuvame ukwenzeka ohlelweni lokulinganisa ukugeleza kwezimboni kusetshenziswa isimiso sengcindezi ehlukene esiyindlela ethandwayo yokuqapha izinga lokugeleza. Ngemva kokuhlolwa kafushane kokugeleza kwe-DP, singayiqonda yini indima ye-transmitter yengcindezi ehlukene ekusizeni ukusebenza kwe-flowmeter.
Amamitha okugeleza adlala indima ebalulekile ekuqapheni izinga loketshezi phakathi kwenethiwekhi yamapayipi ezimboni eyinkimbinkimbi ngokunikeza ukufundwa kokugeleza ezisekelweni ezifika ngesikhathi nezinembile ezifaka isandla ekuphathweni kwezinto ezisebenzayo kanye nokuphepha kokusebenza. Indlela yokucindezela okuhlukile ingenye yezindlela zobuchwepheshe ezinkulu zokulinganisa ukugeleza ezifaka izinhlobo zamamitha okugeleza. Ahlukile ngesakhiwo kodwa anezinhloso ezifanayo zokusebenza ukudala igebe lokucindezela lokubala ukugeleza elisekelwe esimisweni esiyinhlokoIsibalo sikaBernoulli: Amandla aphelele aqukethe amandla e-kinetic kanye namandla angase abe khona ekugelezeni koketshezi ahlala engaguquki kungakhathaliseki izimo. Ngakho-ke isici esiyinhloko salawo ma-flowmeter e-DP empeleni iyithuluzi lokubhoboza (ipuleti le-orifice, ithubhu le-venturi, ithubhu le-pitot, i-v-cone, njll.) ukudala ukusheshisa kokugeleza engxenyeni yendawo, okuholela ekwehleni kwengcindezi ye-hydrostatic yoketshezi.
Yilapho-ke lapho i-differential pressure transmitter iqala khona ukusebenza. Izinto eziyinhloko zingamadivayisi emishini nje, zikhiqiza ngokomzimba umehluko wengcindezi enqubweni kodwa azikho kuzo ezikwazi ukukala ngqo inani kanye nesignali yokuphuma. Ngakho-ke zidinga umsizi ukuze zithole ingcindezi yokuphuma phakathi kwe-up and downstream bese ekugcineni ziyiguqula ibe yisignali yokuphuma yenani lokulinganisa ukugeleza —— kuzwakala njengomsebenzi ofanele kahle i-differential pressure transmitter.
Ngemva kokumiswa kokulinganiswa kwe-DP, umbuzo uwukuthi ingcindezi ehlukene kanye nezinga lokugeleza kwevolumu kungahlobana kanjani? Ngokusekelwe ku-Equation kanye ne-Continuity Equation kaBernoulli, kukhona ubudlelwano obungeyona i-linear phakathi kwengcindezi ehlukanisiwe ekhiqizwe (ΔP) kanye nezinga langempela lokugeleza koketshezi (Q):
Q=K√ΔP
Lapho i-K imelela i-coefficient ethile yemitha enqunywa yizinto ezithile uhlobo lwento eyinhloko kanye nezinye izinto eziningana (ubuningi boketshezi, usayizi wepayipi njalo njalo). Isignali ye-transmitter eluhlaza engu-4~20mA ayilingani nesilinganiso sokugeleza futhi ayikwazi ukumelela kahle ukuthambekela kwayo. Inkinga ingaxazululwa ngokuhlanganiswa kokukhishwa kwezimpande zesikwele (SRE) okuyisikwele okusuka ku-ΔP yasendaweni okwenza isignali ilingane nesilinganiso sokugeleza kwevolumu ekugcineni.
Uma umthumeli engakwazi ukwenza i-SRE ngaphakathi, ukubala kufanele kuphathwe yikhompyutha yokugeleza yangaphandle noma uhlelo lokulawula olungandisa ubunzima kanye namaphutha angaba khona ekuqondisweni kwesignali. Ngakho-ke ama-DP transmitter anamuhla avame ukuba nomsebenzi wesignali we-SRE owakhelwe ngaphakathi kusekethe ye-analog futhi angakhipha i-square rooted 4~20mA. Ngaphezu kwalokho, ama-DP transmitter angafaka ukunqanyulwa kokugeleza okuphansi ukuze kuncishiswe ukuzulazula kwenzwa okungakhuliswa ngokungalingani ngesivinini sokugeleza esiphansi. Lo msebenzi wesofthiwe uphoqa umkhiqizo ukuthi ube yi-4 mA (ukugeleza okungu-0%) lapho ukugeleza okubalwe kuwela ngaphansi komkhawulo ochaziwe ukuze kugwenywe isignali engaguquki kanye nokuqongelela kokugeleza okungamanga.
Izinhlelo zokulinganisa ukugeleza komfutho ohlukile zingenye yezindlela zobuchwepheshe zokulawula ukugeleza ezifakazelwe kakhulu nezidumile. Nakuba zinikeza izinzuzo ezinhle kakhulu, kukhona nemikhawulo ngenxa yesakhiwo kanye nomgomo:
+ Umklamo ojwayelekile, ubuchwepheshe obuzinzile
+ Isakhiwo esiqinile nesihlala isikhathi eside, azikho izingxenye ezinyakazayo
+ Ukunemba okuthuthukisiwe kanye nokuzinza
- Ukulahlekelwa yingcindezi okungapheli
- Isilinganiso sokujika esinciphile
- Izwela izinguquko ekubuneni koketshezi nezinye izici
Ukukhetha i-flowmeter efanele kubalulekile ekusebenzeni kahle nasekunembile kokulinganisa ukugeleza koketshezi. Ngokucabanga ngokuphelele ngezinto zokusebenza, abasebenzisi bangenza izinqumo ezinolwazi ezihambisana nezidingo ezithile.Shanghai WangyuanUbelokhu ehilelekile ekukhiqizeni nasekuhlinzekeni ngezinsiza zokulinganisa nokulawula iminyaka engaphezu kwengu-20 kufaka phakathi zonke izinhlobo zama-flowmeter, ama-differential pressure transmitters kanye nezinye izinto zokulinganisa ukugeleza. Uma uneminye imibuzo noma isidingo, sicela ungangabazi ukuxhumana nathi.
Isikhathi sokuthunyelwe: Agasti-25-2025