Kwindlela yokujonga uxinzelelo oluhlukeneyo, sinokuqaphela ukuba ngamanye amaxesha imveliso yetransmitter yoxinzelelo oluhlukeneyo iyafuneka ukuba icutshungulwe ibe sisiginali ye-square root 4 ~ 20mA. Ezi zicelo zihlala zenzeka kwinkqubo yokulinganisa ukuhamba kombane kusetyenziswa umgaqo woxinzelelo oluhlukeneyo ongomnye weendlela ezidumileyo zokujonga izinga lokuhamba kombane. Emva kokuba umlinganiselo wokuhamba kombane we-DP uphononongwe ngokufutshane, singayiqonda indima yetransmitter yoxinzelelo oluhlukeneyo ekuncedeni ukusebenza kwe-flowmeter.
Iimitha zokuhamba kwamanzi zidlala indima ebalulekileyo ekujongeni izinga lolwelo phakathi kwenethiwekhi yemibhobho yemizi-mveliso enzima ngokubonelela ngokufundwa kokuhamba kwamanzi kwiziseko ezichanekileyo nezifanelekileyo ezinegalelo kulawulo olusebenzayo lwezinto kunye nokhuseleko lokusebenza. Indlela yoxinzelelo olwahlukileyo yenye yezona teknoloji ziphambili zokulinganisa ukuhamba kwamanzi ezibandakanya iintlobo zeemitha zokuhamba kwamanzi. Zahlukile kwisakhiwo kodwa zabelana ngeenjongo zokusebenza ezifanayo ukudala umsantsa woxinzelelo lokubala ukuhamba kwamanzi osekelwe kumgaqo ophambiliI-Equation kaBernoulli: Amandla apheleleyo aquka amandla e-kinetic kunye namandla anokubakho ekuhambeni kolwelo ahlala engaguquki nokuba iimeko zinjani na. Ke ngoko into ephambili yezo DP flowmeters ngokuyintloko sisixhobo sokuthomalalisa (ipleyiti ye-orifice, ityhubhu ye-venturi, ityhubhu ye-pitot, i-v-cone, njl.njl.) ukudala ukukhawuleziswa kokuhamba kolwelo kwicandelo lendawo, okukhokelela ekwehleni koxinzelelo lwe-hydrostatic lolwelo.
Kulapho ke i-differential pressure transmitter idlala khona. Izinto eziphambili zizixhobo nje zoomatshini, zenza ngokwasemzimbeni umahluko woxinzelelo kwinkqubo kodwa akukho nanye kuzo ekwaziyo ukulinganisa ngokuthe ngqo ixabiso kunye nesignali yokuphuma. Ngoko ke zifuna umncedisi wokubona uxinzelelo lomahluko phakathi komlambo ongasentla nongasentla aze ekugqibeleni aluguqule lube yisignali yokuphuma yexabiso lokulinganisa ukuhamba—— kuvakala ngathi ngumsebenzi ofanelekileyo kwi-differential pressure transmitter.
Emva kokuba umlinganiselo we-DP umiselwe, umbuzo uya kuba yintoni enokunxulumana noxinzelelo olwahlukileyo kunye nesantya sokuhamba kwevolumu? Ngokusekelwe kwi-Equation kunye ne-Continuity Equation kaBernoulli, kukho ubudlelwane obungenamgca phakathi koxinzelelo olwahlukileyo oluvelisiweyo (ΔP) kunye nesantya sokuhamba kolwelo (Q):
Q=K√ΔP
Apho u-K emele i-coefficient ethile yemitha egqitywe zii-factors uhlobo lwe-primary element kunye nezinye izinto ezininzi (ubuninzi bolwelo, ubungakanani bombhobho njalo njalo). Isignali ye-transmitter ye-4~20mA eluhlaza ayilungelelanisi isantya sokuhamba kwaye ayikwazi ukumela ngokufanelekileyo indlela yayo. Ingxaki ingasonjululwa ngokudibanisa i-square root extraction (SRE) esusa i-square roots kwi-ΔP yendalo eyenza isignali ilingane nesantya sokuhamba kwe-volumetric ekugqibeleni.
Ukuba i-transmitter ayikwazi ukwenza i-SRE ngaphakathi, ukubala kufuneka kuphathwe yikhompyutha yangaphandle okanye inkqubo yolawulo enokongeza ubunzima kunye neendawo ezinokwenzeka zeempazamo kwindlela yokuhambisa isignali. Ke ngoko, ii-DP transmitters zanamhlanje zihlala zinomsebenzi we-SRE wesignali eyakhelwe ngaphakathi kwisekethe ye-analog kwaye zinokukhupha i-4~20mA enomda osikwele. Ngaphezu koko, ii-DP transmitters zinokusebenzisa umda wokuhamba okuphantsi ukunciphisa ukushukuma kwe-sensor okunokwandiswa ngokungalinganiyo kwisantya sokuhamba esiphantsi. Lo msebenzi wesoftware unyanzela isiphumo ukuya kwi-4 mA (0% ukuhamba) xa ukuhamba okubaliweyo kuwela ngaphantsi komda ochaziweyo ukuze kuthintelwe isignali engaguqukiyo kunye nokuqokelelana kokuhamba okungamanga.
Iinkqubo zokulinganisa ukuhamba koxinzelelo olwahlukileyo zezinye zezona teknoloji zolawulo lokuhamba eziqinisekisiweyo nezidumileyo. Nangona zibonelela ngeenzuzo ezibalaseleyo, kukwakho nemida ngenxa yesakhiwo kunye nomgaqo:
+ Uyilo olusemgangathweni, iteknoloji esekwe kakuhle
+ Isakhiwo esomeleleyo nesihlala ixesha elide, akukho zinto zishukumayo
+ Ukuchaneka okuphuculweyo kunye nozinzo
- Ukulahlekelwa koxinzelelo olungapheliyo
- Umlinganiselo wokunciphisa umngcipheko
- Ibuthathaka kutshintsho kubuninzi bolwelo kunye nezinye izinto
Ukukhetha i-flowmeter efanelekileyo kubalulekile ukuze kusebenze kakuhle kwaye kuchaneke ukulinganiswa kokuhamba kolwelo. Ngokuqwalasela ngokupheleleyo izinto ezisebenzayo, abasebenzisi banokwenza izigqibo ezinolwazi ezihambelana neemfuno ezithile.Shanghai WangyuanUsebenze ekuveliseni nasekulungiseni izixhobo zokulinganisa nokulawula kangangeminyaka engaphezu kwama-20 kuquka zonke iintlobo zeemitha zokuhamba kwamanzi, ii-differential pressure transmitters kunye nezinye izixhobo zokulinganisa ukuhamba kwamanzi. Ukuba uneminye imibuzo okanye imfuneko, nceda ungathandabuzi ukuqhagamshelana nathi.
Ixesha leposi: Agasti-25-2025