Kev cog qoob loo ntawm cov khoom sib nqus flowmeter yog qhov tseem ceeb rau kev tswj xyuas qhov tseeb thiab ruaj khov ntsuas. Kab lus no tshawb txog qhov tseem ceeb ntawm kev siv av, txoj hauv kev zoo hauv av, thiab kev ceev faj kom ua tau zoo.
Vim li casSib nqus FlowmetersYuav Tsum Tau Ua Raws Cai?
Electromagnetic flowmeters ua haujlwm los ntawm kev ntsuas qhov voltage generated raws li cov kua conductive ntws los ntawm ib qho chaw sib nqus. Kev ntsuas electrodes raug rau DC lossis AC hluav taws xob teb thiab tuaj yeem raug cuam tshuam rau sab nraud. Yog tias tsis muaj kev tiv thaiv zoo thiab hauv av, lub suab nrov thiab cuam tshuam tam sim no tuaj yeem cuam tshuam qhov tsis muaj zog induced signals, cuam tshuam qhov tseeb thiab ruaj khov. Kev ntseeg tau hauv av kom ntseeg tau tias lub flowmeter ua haujlwm yam tsis muaj hluav taws xob cuam tshuam, tiv thaiv kev ntsuas qhov tseeb.
Yuav Ua Li Cas Ua Tau Zoo Hauv Ib Qhov Sib Nqus Flowmeter
1. Grounding rau cov kav hlau
Thaum ntsia rau ntawm cov kav hlau tsis muaj txheej txheej insulating:
Txuas cov yeeb nkab rau lub flowmeter.
Txuas cov xaim hauv av mus rau daim phiaj hauv av.
Qhov kev teeb tsa no ua kom muaj kev sib txuas ncaj qha thiab ruaj khov hauv av.
2. Grounding ntawm cov yeeb nkab uas tsis yog hlau
Rau kev teeb tsa ntawm cov kav dej tsis yog hlau, muaj peb txoj hauv kev hauv av:
A. Ntiv Nplhaib
Grounding rings yog ntsia rau ntawm flanges ntawm ob qho kawg ntawm txoj kab ntsuas raj.
Lawv ua kom cov kua conductive ua raws li qhov taw qhia rau qhov sib txawv muaj peev xwm teeb liab, tsim kom muaj lub teeb liab ruaj khov.
Hom ntawm Grounding Rings:
Hom Ib txwm: Txheem rau feem ntau daim ntawv thov.
Kev Tiv Thaiv Hom: Tiv thaiv flange linings, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig corrosive.
Caj Dab Hom: Zoo tagnrho rau cov xov xwm abrasive, muab cov kav ntev.
B. Grounding Electrodes (Peb-Electrode System)
Rau cov xov xwm corrosive heev, cov khoom siv electrode feem ntau yog ua los ntawm cov hlau muaj txiaj ntsig (xws li tantalum, titanium, platinum).
Grounding rings rau cov ntawv thov no tuaj yeem txwv tsis pub kim, tshwj xeeb tshaj yog rau cov kab loj loj.
Ib qho thib peb electrode yog ntxiv rau ntawm qhov qis tshaj plaws ntawm lub ntsuas ntsuas lub raj rau cov nqi tsim nyog hauv av.
C. Virtual Grounding
Qhov kev siv thev naus laus zis no tshem tawm qhov xav tau ntxiv cov nplhaib hauv av lossis electrodes.
Nws cais cov input amplifier thiab optocoupler nyob rau hauv lub flow converter Circuit Court, cia lub ntsuas Circuit Court ntab ntawm cov kua lub peev xwm.
Virtual grounding txo qis kev teeb tsa thiab tus nqi.
Cov Lus Ceeb Toom Tseem Ceeb rau Grounding
Independent Grounding:
Hauv avmagnetic flow metercais kom tsis txhob cuam tshuam los ntawm cov dej xau lossis hluav taws xob nrov ntawm lwm cov twj paj nruag.
Xaiv qhov Grounding Qhov Chaw Txawj Ntse:
Khaws qhov chaw hauv av kom deb ntawm cov khoom siv hluav taws xob loj kom tsis txhob cuam tshuam.
Tiv thaiv Flowmeter thaum lub sijhawm teeb tsa:
Tsis txhob cuam tshuam cov electrodes los yog roj hmab hauv ob sab hauv lub flowmeter thaum vuam.
Siv cov roj hmab gaskets nruab nrab ntawm flanges los tiv thaiv cov dej ntws.
Grounding tsis yog ib qho kev xav tau xwb tab sis yog ib kauj ruam tseem ceeb hauv kev ua kom qhov tseeb thiab kev ntseeg siab ntawm magflow meters. Txawm hais tias ntsia rau ntawm cov kav hlau lossis cov hlau tsis yog hlau, qhov kev xaiv ntawm txoj hauv kev hauv av-xws li nws cov nplhaib hauv av, electrodes, lossis virtual grounding-yuav tsum phim cov kev xav tau ntawm daim ntawv thov. Kev ceev faj kom raug thaum lub sijhawm teeb tsa ntxiv txhim kho lub flowmeter qhov kev ua tau zoo, ua kom raug ntsuas tau txawm tias nyob hauv ib puag ncig nyuaj.