Ekwenzeni ukuqapha kwengcindezi ehlukile, singaqaphela ukuthi kwesinye isikhathi okukhiphayo kokudlulisa ingcindezi ehlukile kuyadingeka ukuthi kucutshungulwe kusiginali yesikwele esingu-4~20mA. Izicelo ezinjalo zivame ukwenzeka ohlelweni lokulinganisa ukugeleza kwezimboni kusetshenziswa isimiso sokucindezela okuhlukile okungenye yezindlela ezidumile zokuqapha izinga lokugeleza. Ngemva kokubuyekezwa kafushane ukukalwa kokugeleza kwe-DP singayiqonda yini indima yesidlulisi sengcindezi ehlukile ekusizeni ukusebenza kwe-flowmeter.
Amamitha okugeleza asebenza indima ebalulekile ekuqapheni izinga loketshezi phakathi kwenethiwekhi yamapayipi ezimboni eyinkimbinkimbi ngokunikeza ukufundwa kokugeleza ngezisekelo ezifika ngesikhathi nezinembayo ezinikela ekuphathweni ngempumelelo kwezinto kanye nokuphepha kokusebenza. Indlela yokucindezela ehlukile ingenye yobuchwepheshe obukhulu bokulinganisa ukugeleza okubandakanya izinhlobo zama-flowmeters. Ahlukene ngesakhiwo kodwa abelana ngezinjongo zokusebenza ezifanayo ukuze adale igebe lengcindezi yokubala ukugeleza okusekelwe kumgomo oyinhlokoI-Equation kaBernoulli: Amandla aphelele ahlanganisa amandla e-kinetic kanye namandla angaba khona ekugelezeni koketshezi ahlala engashintshile kungakhathaliseki izimo. Ngakho-ke into eyinhloko yalawo ma-flowmeters e-DP empeleni iyithuluzi elidonsa umoya (ipuleti le-orifice, ishubhu le-venturi, ishubhu le-pitot, i-v-cone, njll.) ukudala ukusheshisa kokugeleza esigabeni sendawo, okuholela ekwehleni kwengcindezi ye-hydrostatic yoketshezi.
Kulapho-ke i-differential pressure transmitter iqala khona ukusebenza. Ama-elementi ayinhloko amadivaysi emishini nje, adala umehluko wokucindezela ngokoqobo enqubweni kodwa ayikho kuwo ekwazi ukulinganisa ngokuqondile inani nesiginali yokuphumayo. Ngakho-ke badinga umsizi ukuze bathole ingcindezi ehlukanisayo phakathi komfula okhuphukayo kanye nozansi nomfula futhi ekugcineni uyiguqule ibe isignali ephumayo yenani lokulinganisa ukugeleza —— kuzwakala njengomsebenzi ofaneleka kahle wesidlulisi sengcindezi esihlukile.
Ngemuva kokusungulwa kwesilinganiso se-DP, umbuzo ungaba ukuthi ingcindezi ehlukile kanye nesilinganiso sokugeleza kwevolumu kungahlotshaniswa kanjani? Ngokusekelwe ku-Bernoulli's Equation and Continuity Equation, kukhona ubudlelwano obungaqondile phakathi kwengcindezi ekhiqiziwe yokuhlukanisa (ΔP) kanye nenani langempela lokugeleza kwamanzi (Q):
Q=K√ΔP
Lapho u-K emele i-coefficient eqondene nemitha enqunywa izici uhlobo lwe-elementi eyinhloko nezinye izici ezimbalwa (ukuminyana koketshezi, usayizi wamapayipi nokunye). Isiginali ye-Transmitter engu-4~20mA ayikona umugqa wokugeleza futhi ayikwazi ukumela kahle ukuthambekela kwayo. Inkinga ingaxazululwa ngokuhlanganiswa kokukhipha impande eyisikwele (i-SRE) esusa isikwele i-ΔP yomdabu okwenza isignali ilingane nezinga lokugeleza kwevolumu ekugcineni.
Uma isidluliseli singakwazi ukusebenzisa i-SRE ngaphakathi, ukubala kufanele kusingathwe yikhompyutha egeleza yangaphandle noma uhlelo lokulawula olungahlanganisa ubunkimbinkimbi namaphutha angaba khona emzileni wesiginali. Ngakho-ke abathumeli besimanje be-DP ngokuvamile banomsebenzi we-SRE owakhelwe ngaphakathi kumjikelezo we-analog futhi angakhipha isikwele esinezimpande ezi-4~20mA. Ngaphezu kwalokho, ama-transmitters e-DP angasebenzisa ukunqanyulwa kokugeleza okuphansi ukuze kuncishiswe ukukhukhuleka kwenzwa okungakhuliswa ngokungenakulinganiswa ngezinga lokugeleza eliphansi. Lo msebenzi wesofthiwe uphoqa okukhiphayo ukuthi kube ngu-4 mA (ukugeleza okungu-0%) uma ukugeleza okubaliwe kwehla ngaphansi komkhawulo ochaziwe ukuze kugwenywe isignali eguquguqukayo kanye nokunqwabelana kokugeleza okungamanga.
Amasistimu okulinganisa ukugeleza kwengcindezi ahlukile angobunye bobuchwepheshe obufakazelwe futhi obudumile bokulawula ukugeleza. Nakuba zinikeza izinzuzo ezivelele, kukhona futhi imikhawulo ngenxa yesakhiwo nomgomo:
+ Idizayini esezingeni, ubuchwepheshe obusungulwe kahle
+ Isakhiwo esiqinile nesihlala isikhathi eside, azikho izingxenye ezihambayo
+ Ukunemba okuthuthukisiwe nokuzinza
- Ukulahlekelwa ingcindezi unomphela
- Isilinganiso sokwehla esifushane
- Iyazwela ekushintsheni kokuminyana koketshezi nezinye izici
Ukukhetha i-flowmeter efanele kubalulekile ekusebenzeni kahle nokunemba kwesilinganiso sokugeleza koketshezi. Ngokucabangela kabanzi izici zokusebenza abasebenzisi bangakwazi ukwenza izinqumo ezinolwazi ezihambisana nezidingo ezithile.Shanghai Wangyuanibambe iqhaza ekukhiqizeni nasekwenzeni izinsiza zokulinganisa nokulawula iminyaka engaphezu kwengu-20 okuhlanganisa zonke izinhlobo zama-flowmeters, ama-different pressure transmitters nokunye ukufakwa kokulinganisa ukugeleza. Uma uneminye imibuzo noma imfuneko, sicela ungangabazi ukusithinta.
Isikhathi sokuthumela: Aug-25-2025