Cov Kev Cai Txuj Ci rau Electromagnetic Flowmeters: Xyuas kom meej thiab ntseeg tau

1. Cov Qauv Kev Ntsuas Kev Ua Haujlwm

1.1 Qhov Tseeb thiab Kev Rov Ua Dua

• Kev Ntsuas Tseeb Ib Txwm Muaj:Cov EMFyuav tsum ua tiav ±0.5% txog ±1% ntawm qhov ntsuas ntws thoob plaws qhov ntau thiab tsawg ua haujlwm, nrog rau cov qauv zoo tshaj plaws muab qhov tseeb ±0.2%. Qhov no yuav tsum tau txheeb xyuas raws li cov xwm txheej txheem (piv txwv li, ISO 9104 rau kev ntsuas dej ntws).
• Kev Rov Ua Dua: Kev hloov pauv ntawm kev ntsuas rov ua dua yuav tsum tsis pub tshaj ± 0.1% ntawm tus nqi ntws kom ntseeg tau tias muaj kev sib xws hauv cov txheej txheem tseem ceeb xws li kev ntsuas tshuaj lossis kev them nqi dej.

1.2 Qhov Ntau Npaum Li Cas thiab Qhov Piv Txwv Turndown

• Qhov Ceev Ntau: Muaj peev xwm ntsuas qhov ceev ntws ntawm 0.1 m/s (cov ntawv thov ntws qis xws li cov tshuab kuaj mob) mus txog 15 m/s (cov kav dej lag luam ceev ceev).
• Qhov Piv Txwv Tig Rov Qab: Qhov piv txwv tsawg kawg nkaus 20:1 (piv txwv li, ntsuas 0.5–10 m/s) yog tus qauv, nrog rau cov qauv siab heev muab txog li 100:1 rau cov ntawv thov dav dav.

1.3 Kev Ua Kua Dej

• Qhov Tsawg Kawg Nkaus Kev Coj Hluav Taws Xob: Cov kua dej yuav tsum muaj qhov kev coj hluav taws xob ≥5 μS/cm (rau cov kua dej uas muaj dej) kom ua rau muaj lub zog electromotive (EMF) uas ntsuas tau. Rau cov kua dej uas muaj kev coj hluav taws xob tsawg (piv txwv li, dej deionized), tej zaum yuav xav tau cov electrodes thiab amplifiers tshwj xeeb (≥0.5 μS/cm).
• Kev Ruaj Ntseg ntawm Kev Coj Hluav Taws Xob: Kev hloov pauv sai ntawm kev coj hluav taws xob (piv txwv li, vim yog kev sib xyaw tshuaj lom neeg) tuaj yeem ua rau kev ntsuas tsis sib xws, uas yuav tsum tau muaj cov txheej txheem them nyiaj uas twb muaj lawm.

2. Cov Kev Cai Ib puag ncig thiab Kev Ua Haujlwm

2.1 Kev Ntsuas Kub thiab Siab

• Kub ntawm cov kua dej:
  • Tus Qauv: -20 ° C txog 120 ° C (piv txwv li, rau dej thiab dej khib nyiab).
  • Kub siab: Txog li 200 ° C (nrog cov ntaub thaiv tshwj xeeb xws li PTFE lossis ceramic rau cov txheej txheem kev lag luam).
• Kev Siab ntawm Cov Kav Dej:
  • Qis-siab: ≤1.6 MPa (feem ntau nyob rau hauv cov kab ke hauv nroog).
  • Siab siab: Txog li 40 MPa (rau roj thiab roj av lossis hydraulic daim ntawv thov), xav tau cov qauv flange ruaj khov thiab kev sim siab raws li ASME B16.5.

2.2ElectromagneticKev Sib Haum Xeeb (EMC)

• Yuav tsum ua raws li cov qauv EMC (piv txwv li, IEC 61326-1) kom tiv taus kev cuam tshuam los ntawm cov motors, transformers, lossis xov tooj cua zaus (RF). Cov cables tiv thaiv thiab cov tsev grounded yog qhov tseem ceeb rau kev txo suab nrov.

2.3 Kev Tiv Thaiv Kev Tawg Thiab Kev Xeb

• Kev Tiv Thaiv Kev Tawg: Hauv thaj chaw muaj kev phom sij (piv txwv li, cov nroj tsuag petrochemical),EMFs yuav tsum ua tau raws li cov ntawv pov thawj xws li ATEX, IECEx, lossis NEC 500 rau kev nyab xeeb intrinsically (IS) lossis flameproof designs.
• Kev Tiv Thaiv Kev Xeb: Cov khoom ntub dej (electrodes thiab liners) yuav tsum tiv taus cov kua dej hnyav:
  • Cov ntaub ntawv: PTFE (polytetrafluoroethylene) rau kev tiv thaiv tshuaj lom neeg, polyurethane rau kev puas tsuaj (piv txwv li, slurries), lossis ceramic rau qhov kub thiab txias / abrasive ib puag ncig.
  • Cov Hluav Taws Xob: Cov ntaub ntawv xws li 316L stainless hlau, Hastelloy C, lossis tantalum rau cov kua dej uas yooj yim xeb (piv txwv li, dej hiav txwv, kua qaub).

3. Kev Teeb tsa thiab Cov Kev Cai rau Cov Kav Dej

3.1 Cov Yeeb Nkab Ncaj Qha

• Sab saud dej: Yam tsawg kawg yog 5–10 lub yeeb nkab uas muaj txoj kab uas hla ntawm cov yeeb nkab ncaj ua ntej lub ntsuas kom ntseeg tau tias dej ntws tau zoo, txo qhov cua daj cua dub los ntawm lub luj tshib, lub qhov dej, lossis lub tees.
• Cov dej ntws mus rau hauv qab: 2–5 lub yeeb nkab uas muaj txoj kab uas hla ntawm cov yeeb nkab ncaj tom qab lub 'meter' kom tiv thaiv kev cuam tshuam rov qab.

3.2 Kev Taw Qhia Txog Kev Teeb Tsa

• Muaj peev xwm teeb tsa tau kab rov tav, ntsug, lossis nqes, tab sis kev teeb tsa ntsug (nrog rau cov dej ntws mus rau sab saud) yog qhov zoo dua rau cov kua dej uas muaj cov khoom khov kom tiv thaiv kev poob qis.
• Rau cov dej ntws ob theem uas siv roj thiab kua, kev teeb tsa kab rov tav nrog qhov cua nkag kom zoo yog qhov tseem ceeb heev kom tsis txhob muaj cov npuas sib sau ua ke hauv lub raj ntsuas.

3.3 Kev Siv Hluav Taws Xob Av

• Yuav tsum muaj lub nplhaib av lossis lub electrode ntsia kom tshem tawm qhov sib txawv ntawm cov kua dej thiab lub 'meter', kom ntseeg tau tias muaj tseeb.EMFkev ntsuas. Qhov no tseem ceeb heev rau cov kav dej uas tsis yog conductive (piv txwv li, PVC).

4. Cov Teeb Liab Tawm thiab Kev Sib Koom Tes Digital

4.1 Cov Cim Qhia Analog thiab Digital

• Analog: 4–20 mA tso zis (cais tawm) nrog ≤0.1% linearity yuam kev, tsim nyog rau cov kab ke tswj hwm qub.
• Digital: MODBUS RTU/TCP, HART, lossis Profibus DP rau kev xa cov ntaub ntawv tiag tiag, ua kom muaj kev sib koom ua ke nrog SCADA systems lossis huab-based IoT platforms.

4.2 Kev Sau Cov Ntaub Ntawv thiab Kev Tshawb Xyuas

• Muaj lub cim xeeb ua ke rau khaws cov ntaub ntawv ntws, cov xwm txheej ceeb toom, thiab cov kev kuaj mob (piv txwv li, txheej electrode, hnav liner). Cov qauv siab heev muab cov lus ceeb toom txog kev saib xyuas ua ntej los ntawm kev sib txuas wireless (piv txwv li, Bluetooth, 4G).

5. Kev Ntsuas thiab Daim Ntawv Pov Thawj

5.1 Cov Qauv Kev Ntsuas

• Lub Hoobkas calibration raws li cov qauv uas taug qab tau (piv txwv li, ISO 17025-accredited labs) siv cov kua dej siv (feem ntau yog dej). Kev calibration hauv thaj chaw yuav xav tau portablentwscov khoom siv txheeb xyuas lossis cov txheej txheem sib piv.
• Rau cov ntawv thov hloov chaw saib xyuas (piv txwv li, kev lag luam dej), cov 'meter' yuav tsum tau kuaj xyuas tas li (piv txwv li, txhua xyoo) thiab ua raws li cov qauv kev ntsuas kev cai lij choj (piv txwv li, OIML R49, MID hauv EU).

5.2 Daim Ntawv Pov Thawj Kev Lag Luam

• Dej Hauv Zos: NSF/ANSI 61 rau cov dej haus uas siv tau.
• Khoom Noj thiab Dej Haus: 3-A Cov Qauv Huv Si lossis EHEDG rau kev tsim qauv huv si (cov kab du, cov hluav taws xob tsis muaj qhov tawg).
• Kev Lag Luam: Daim ntawv pov thawj CSA, CE, lossis UL rau kev nyab xeeb thiab kev ua tau zoo hauv cov khw muag khoom.

6. Kev Ntseeg Tau thiab Kev Txij Nkawm

6.1 Kev Ruaj Ntseg Mus Ntev

• Kev txav mus los raws sijhawm yuav tsum tsis pub tshaj ± 0.2% ntawm qhov ntsuas tag nrho hauv ib xyoos, txhawb nqa los ntawm kev them nyiaj kub thiab cov haujlwm tsis siv neeg xoom los tiv thaiv kev sib hloov ntawm electrode.
• MTBF (Lub Sijhawm Nruab Nrab Ntawm Qhov Ua Tsis Tau Zoo): ≥100,000 teev rau cov khoom siv hluav taws xob, nrog rau cov khoom hloov tau (piv txwv li, roj teeb hauv cov transmitters siv roj teeb) tsim los rau kev pabcuam hauv thaj chaw yooj yim.

6.2 Tsim Kev Tiv Thaiv Kev Ua Phem

• Rau cov kua nplaum lossis cov kua nplaum uas lo rau (piv txwv li, cov dej khib nyiab), cov yam ntxwv xws li kev txhawb zog pulsed, electrode brushing, lossis ultrasonic cleaning txo cov khoom sib sau ua ke thiab tswj kev ntsuas kom ruaj khov.

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