Lub handheld clamp- ntawm ultrasonic flow meter feem ntau muaj cov khoom siv tes tuav tes, clamp- ntawm cov khoom siv hluav taws xob, cov khoom sib txuas, thiab lub teeb liab ua haujlwm (koob computer). Nws txoj haujlwm ua haujlwm yog raws li hauv qab no: lub transducer hloov hluav taws xob hluav taws xob mus rau hauv lub suab tsis muaj zog thiab xa mus rau hauv cov kua dej uas ntsuas; tus receiver captures lub reflected suab yoj teeb liab, uas yog ces amplified los ntawm hluav taws xob circuitry thiab hloov mus rau hauv ib tug hluav taws xob teeb liab coj mus rau tus nqi txaus. Cov teeb liab no ces xa mus rau cov khoom siv thiab kev sib koom ua ke rau cov ntaub ntawv tso saib thiab suav suav, yog li ua tiav qhov kev ntsuas ntws thiab ntsuas. Cov xwm txheej xws li ntawm - qhov chaw teeb tsa ib puag ncig, cov khoom siv yeeb nkab thiab cov khoom siv hauv ob sab phlu, cov yeeb nkab tsis sib haum, kev teeb tsa thiab kev tso tawm, thiab kev cuam tshuam sab nraud tuaj yeem cuam tshuam rau kev ntsuas qhov tseeb ntawm qhov ntsuas ntsuas no.
Kev cuam tshuam ntawm Kev Txhim Kho Ib puag ncig ntawm Handheld Clamp- ntawm Ultrasonic Flow Meters
1.1 Upstream thiab Downstream Ncaj Yeeb Nkab Ntug
Thaum lub sij hawm ntawm - qhov chaw teeb tsa thiab siv, kev ntsuas feem ntau cuam tshuam los ntawm qhov tsis muaj peev xwm nrhiav tau qhov chaw uas ua tau raws li qhov xav tau. Noj DN300 steel yeeb nkab ua piv txwv, yog tias tus qauv ncaj yeeb nkab ntu ntev yog 10 npaug ntawm cov yeeb nkab txoj kab uas hla (sab sauv) thiab 5 npaug ntawm cov yeeb nkab txoj kab uas hla (kem hauv qab), qhov clamp- ntawm ultrasonic flow meter yog muab piv nrog lub ntsuas hluav taws xob electromagnetic ntws ntawm qhov chaw nyob ntawm qhov chaw sib txawv.
Cov txiaj ntsig tau pom tias qhov tsis txaus ntawm cov yeeb nkab ncaj ncaj ua rau muaj kev ntsuas qhov yuam kev. Thaum cov kav dej ncaj nraim tsis txaus, xws li thaum ntsia tom qab lub luj tshib lossis lub valve, nws feem ntau pom qhov yuam kev zoo, thiab qhov yuam kev tus nqi kuj loj heev.
Lub handheld clamp- ntawm ultrasonic flow meter yog tus tshaj tawm - hom flow meter. Qhov siab dua cov kua dej ruaj khov, qhov ze dua qhov ntsuas qhov nruab nrab ntws nrawm yog rau tus nqi tseeb. Yog li ntawd, yog tias tej yam kev mob tso cai, cov kav dej ntws mus thiab downstream ncaj nraim yuav tsum ntev li ntev tau.
1.2 Fluid Flow Velocity
Qhov khiav ceev ntawm cov kua hauv cov yeeb nkab yog qhov tseem ceeb cuam tshuam rau kev ntsuas qhov tseeb. Cov kev sim qhia tau hais tias thaum cov yeeb nkab Reynolds tus naj npawb tshaj 2320, cov kua dej yog nyob rau hauv lub xeev turbulent; Hauv qab 2320, nws yog laminar ntws. Kev ntsuas kev lag luam feem ntau siv 0.3 m / s ua qhov sib faib ntawm qhov siab thiab qis qis tshaj tawm. Nws raug pom zoo tias qhov ntsuas dej ntws ua haujlwm ntawm qhov nrawm tshaj 0.3 m / s; Hauv qab no tus nqi, qhov tseeb ntawm qhov ntsuas ntsuas tsis tuaj yeem lav.
2. Kev cuam tshuam ntawm cov yeeb nkab Parameters ntawm Handheld Clamp- ntawm Ultrasonic Flow Meters
2.1 Parameter Chaw
Nyob rau hauv cov yeeb nkab ruaj, kho cov yeeb nkab input txoj kab uas hla tsis. Qhov yuam kev input ntawm cov yeeb nkab txoj kab uas hla yog ncaj qha proportional rau qhov ntsuas qhov yuam kev. Thaum qhov tseeb yeeb nkab phab ntsa thickness yog 12 hli, hloov cov input parameter ntawm cov yeeb nkab phab ntsa thickness qhia tau hais tias cov input yuam kev ntawm cov yeeb nkab phab ntsa thickness kuj ncaj qha proportional rau qhov ntsuas qhov yuam kev.
2.2 Cov khoom siv yeeb nkab thiab hauv ob sab phlu
Yog tias cov khoom siv hauv cov yeeb nkab lossis cov ntaub ntawv tsis raug nkag mus tsis raug, nws yuav ua rau muaj kev sib txawv ntawm kev ntsuas kev sib txuas ntawm transducer, uas ua rau muaj kev ua yuam kev hauv lub suab nthwv dej tshwm sim lub kaum ntse ntse, txo qhov ntsuas qhov tseeb, thiab qhov xwm txheej hnyav, txawm tias tiv thaiv kev txais lub teeb liab. Kev sim qhia tau hais tias qhov tseem ceeb ntawm cov yeeb nkab hauv ob sab phlu ntawm qhov ntsuas yog qhov hloov pauv ntawm qhov tseeb ntws txoj kab uas hla. Lub xub ntiag ntawm lub hauv ob sab yuav txo tau qhov zoo ntawm tus ntoo khaub lig-sectional cheeb tsam ntawm cov yeeb nkab, uas ua rau ib tug sib raug txo nyob rau hauv tus nqi npaum li cas los ntawm cov flow velocity. Yog li ntawd, lub hauv ob sab phlu thickness yuav tsum tau txiav txim siab thaum lub sij hawm ntsuas. Kev cuam tshuam ntawm cov khoom siv yeeb nkab thiab hauv ob sab phlu ntawm qhov ntsuas yog los ntawm qhov sib txawv ntawm lub suab nthwv dej propagation ceev hauv cov xov xwm sib txawv. Yog tias lub suab nrawm ntawm cov khoom siv ntau dua li lub suab nrawm, qhov ntsuas qhov ntsuas yuav me dua; conversely, nws yuav loj dua.
Kev cuam tshuam ntawm Transducer Installation thiab Positioning ntawm Handheld Clamp- ntawm Ultrasonic Flowmeters
Raws li txoj kev sib txawv transducer installation, lawv tuaj yeem muab faib ua Z-txoj kev thiab V- txoj kev. Kev xyaum qhia tau hais tias, tsis muaj kev cuam tshuam rau kev txais lub teeb liab, qhov ntsuas qhov tseeb ntawm V- txoj kev zoo tshaj rau Z- txoj kev. Qhov no yog vim V- txoj kev teeb tsa ua kom yooj yim qhov chaw hloov pauv hloov pauv, yog li nws qhov kev ntsuas qhov yuam kev feem ntau yog los ntawm cov yam ntxwv ntawm cov kua dej thiab cov kav dej. Txawm hais tias Z-txoj kev muaj lub suab nrov nthwv dej zoo dua, qhov chaw hloov pauv tau nyuaj dua. Thaum cov kua dej faib tsis sib npaug thiab cov yeeb nkab ncaj ncaj ntawm qhov kawg ntawm lub ntsuas yog luv, ntau-channel ultrasonic flowmeter tuaj yeem siv rau ntau- taw tes kuaj txhawm rau kov yeej qhov yuam kev los ntawm cov kua dej tsis ruaj khov.
3.1 Installation nrug
Kev teeb tsa yuam kev ntawm ultrasonic flowmeter transducer cuam tshuam rau kev ntsuas ntsuas thiab yuav tsum tau teeb tsa nruj me ntsis raws li qhov ntev. Piv txwv li, siv V-txoj kev rau nruab transducers ntawm ib lub raj xa dej DN300mm, kev sib raug zoo ntawm qhov sib txawv ntawm qhov sib txawv thiab qhov kev ntsuas qhov yuam kev tau raug sim los ntawm kev hloov cov transducer installation nrug.
Yog li ntawd, qhov sib txawv ntawm qhov transducer installation nrug muaj qhov cuam tshuam loj rau kev ntsuas qhov yuam kev, yog li qhov sib txawv yuav tsum tau tswj nyob rau hauv qhov tsawg tshaj plaws.
