Zofunikira Zaukadaulo pa Ma Electromagnetic Flowmeters: Kuonetsetsa Kuti Zili Zolondola Ndi Zodalirika

1. Miyezo Yoyezera Magwiridwe Antchito

1.1 Kulondola ndi Kubwerezabwereza

• Kulondola Kwachizolowezi:Ma EMFiyenera kufika pa ± 0.5% mpaka ± 1% ya kuchuluka kwa kayendedwe ka madzi komwe kwayesedwa pa ntchito yonse, ndipo mitundu yapamwamba imapereka kulondola kwa ± 0.2%. Izi ziyenera kutsimikiziridwa pansi pa mikhalidwe yokhazikika (monga ISO 9104 poyesa kayendedwe ka madzi).
• Kubwerezabwereza: Kusintha kwa miyeso yobwerezabwereza sikuyenera kupitirira ± 0.1% ya kuchuluka kwa madzi kuti zitsimikizire kuti zinthu zikuyenda bwino monga kumwa mankhwala kapena kubweza madzi.

1.2 Chiŵerengero cha Kuyenda kwa Madzi ndi Kutsika kwa Madzi

• Kuthamanga Kwambiri: Kutha kuyeza kuthamanga kwa madzi kuyambira 0.1 m/s (ntchito zotsika monga machitidwe a labotale) mpaka 15 m/s (mapaipi amafakitale othamanga kwambiri).
• Chiŵerengero cha Turndown: Chiŵerengero chocheperako cha 20:1 (monga, choyezera 0.5–10 m/s) ndicho chokhazikika, ndipo mitundu yapamwamba imapereka mpaka 100:1 pa ntchito zosiyanasiyana.

1.3 Kuyendetsa Mafunde

• Kutulutsa Kochepa Kwambiri: Madziwo ayenera kukhala ndi kutulutsa mphamvu ≥5 μS/cm (kwa madzi opangidwa ndi madzi) kuti ayambe mphamvu yoyezeka ya electromotive (EMF). Kwa madzi otulutsa mphamvu otsika (monga madzi osasinthidwa), ma electrode apadera ndi ma amplifier angafunike (≥0.5 μS/cm).
• Kukhazikika kwa Kuyendetsa Mphamvu: Kusintha mwachangu kwa kuyendetsa mphamvu (monga chifukwa cha kusakaniza mankhwala) kungayambitse kusinthasintha kwa muyeso, zomwe zimapangitsa kuti pakhale njira zolipirira zomwe zamangidwa mkati.

2. Zofunikira pa Zachilengedwe ndi Ntchito

2.1 Kuyeza kwa Kutentha ndi Kupanikizika

• Kutentha kwa Madzi:
  • Muyezo: -20°C mpaka 120°C (monga madzi ndi madzi otayira).
  • Kutentha Kwambiri: Mpaka 200°C (ndi ma liners apadera monga PTFE kapena ceramic yogwiritsira ntchito mafakitale).
• Kupanikizika kwa Paipi:
  • Kuthamanga kochepa: ≤1.6 MPa (yofala m'maboma).
  • Kupanikizika Kwambiri: Mpaka 40 MPa (ya mafuta ndi gasi kapena ma hydraulic application), zomwe zimafuna mapangidwe olimba a flange ndi kuyesa kuthamanga kwa ASME B16.5.

2.2Magetsi amagetsiKugwirizana (EMC)

• Ayenera kutsatira miyezo ya EMC (monga IEC 61326-1) kuti asasokonezedwe ndi ma mota, ma transformer, kapena magwero a wailesi (RF). Zingwe zotetezedwa ndi nyumba zokhazikika ndizofunikira kwambiri kuti phokoso lichepe.

2.3 Kuphulika ndi Kukana Kudzimbiri

• Chitetezo ku Kuphulika: M'malo oopsa (monga zomera za petrochemical),EMFAyenera kukwaniritsa ziphaso monga ATEX, IECEx, kapena NEC 500 kuti apange mapangidwe otetezeka (IS) kapena osayaka moto.
• Kukana Kudzimbiritsa: Ziwalo zonyowa (ma electrode ndi ma liners) ziyenera kupirira madzi amphamvu:
  • Ma Liners: PTFE (polytetrafluoroethylene) yoteteza ku mankhwala, polyurethane yoteteza ku kukumba (monga slurries), kapena ceramic yoteteza ku kutentha kwambiri/kukumbatira.
  • Ma electrode: Zipangizo monga chitsulo chosapanga dzimbiri cha 316L, Hastelloy C, kapena tantalum yamadzimadzi omwe amatha dzimbiri (monga madzi a m'nyanja, ma acid).

3. Zofunikira pa Kukhazikitsa ndi Kuyika Mapaipi

3.1 Kuthamanga kwa Mapaipi Olunjika

• Kumtunda: Mapaipi okwana 5–10 a mainchesi a mapaipi owongoka asanafike mita kuti zitsimikizire kuti madzi akuyenda bwino, kuchepetsa kugwedezeka kwa zigongono, ma valve, kapena ma tees.
• Pansi pa mtsinje: mapaipi awiri mpaka asanu a mapaipi owongoka pambuyo pa mita kuti apewe kusokonezeka kwa madzi obwerera m'mbuyo.

3.2 Kukhazikitsa Koyenera

• Ikhoza kuyikidwa mopingasa, molunjika, kapena molunjika, koma kuyika molunjika (kokhala ndi madzi oyenda mmwamba) kumakondedwa ndi madzi okhala ndi zinthu zolimba kuti zisawonongeke.
• Pa kuyenda kwa mpweya ndi madzi m'magawo awiri, kuyika mopingasa ndi mpweya wabwino ndikofunikira kwambiri kuti tipewe kusonkhana kwa thovu mu chubu choyezera.

3.3 Kukhazikitsa Magetsi

• Mphete yoyambira kapena electrode iyenera kuyikidwa kuti ichotse kusiyana komwe kungachitike pakati pa madzi ndi mita, kuonetsetsa kuti ndi yolondola.EMFKuyeza kumeneku n'kofunika kwambiri makamaka m'mapaipi osayendetsa magetsi (monga PVC).

4. Kutulutsa kwa Zizindikiro ndi Kuphatikizana kwa Digito

4.1 Zizindikiro za Analogi ndi Za digito

• Analogi: 4–20 mA output (yosiyana) yokhala ndi vuto la ≤0.1% linearity, yoyenera machitidwe olamulira akale.
• Za digito: MODBUS RTU/TCP, HART, kapena Profibus DP yotumizira deta nthawi yeniyeni, zomwe zimathandiza kuti pakhale kulumikizana ndi machitidwe a SCADA kapena nsanja za IoT zochokera ku mitambo.

4.2 Kulemba ndi Kuzindikira Deta

• Chikumbutso chomangidwa mkati kuti chisungire deta yoyenda, zochitika za alamu, ndi magawo ozindikira (monga, chophimba cha electrode, kuvala kwa liner). Mitundu yapamwamba imapereka machenjezo okonzekera bwino kudzera pa kulumikizana kwa waya (monga, Bluetooth, 4G).

5. Kulinganiza ndi Chitsimikizo

5.1 Miyezo Yoyezera

• Kuyesa mafakitale motsatira miyezo yolondola (monga, ma laboratories ovomerezeka a ISO 17025) pogwiritsa ntchito madzi ofotokozera (nthawi zambiri madzi). Kuyesa kwa munda kungafunike kunyamulidwakuyendazipangizo zotsimikizira kapena njira zofananira.
• Pa ma fomu oti munthu asamutsidwe (monga kugulitsa madzi), mita iyenera kuyesedwa nthawi ndi nthawi (monga chaka chilichonse) ndikutsatira miyezo ya metrology yovomerezeka ndi malamulo (monga OIML R49, MID ku EU).

5.2 Ziphaso za Makampani

• Madzi a Municipal: NSF/ANSI 61 ya zipangizo zolumikizirana ndi madzi akumwa.
• Chakudya ndi Zakumwa: 3-A Sanitary Standards kapena EHEDG ya mapangidwe aukhondo (ma liners osalala, ma electrode opanda mipata).
• Zamalonda: Chitsimikizo cha CSA, CE, kapena UL cha chitetezo ndi magwiridwe antchito m'misika yomwe mukufuna.

6. Kudalirika ndi Kusamalira

6.1 Kukhazikika Kwanthawi Yaitali

• Kuthamanga kwa madzi pakapita nthawi sikuyenera kupitirira ±0.2% ya sikelo yonse pachaka, mothandizidwa ndi kubweza kutentha ndi ntchito zodziyimira pawokha kuti zithetse kugawanika kwa ma electrode.
• MTBF (Nthawi Yapakati Pakati pa Kulephera): ≥ maola 100,000 pazida zamagetsi, zokhala ndi zida zosinthika (monga mabatire omwe ali mu ma transmitter oyendetsedwa ndi batri) zomwe zapangidwira kuti ntchito ya kumunda ikhale yosavuta.

6.2 Kapangidwe Koletsa Kuipitsa

• Pa madzi omata kapena ozungulira (monga madzi otayira), zinthu monga kusuntha kwa pulsed, kutsuka ndi electrode, kapena kuyeretsa ndi ultrasound zimachepetsa kuchulukana kwa madzi ndikusunga umphumphu wa muyeso.

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