N’chifukwa Chiyani Ultrasonic Flow Meter Imakumana ndi Zero-Point Drift?

Kuti mupeze mita yoyezera kuchuluka kwa madzi, ultrasoundkusuntha kwa mfundo zopanda ziroimatanthauza mkhalidwe womwe mita imasonyeza kuchuluka kwa madzi ngakhale pamene chitolirocho chiyenera kukhala pa zero.

Chochitika ichi n'chofunika kwambiri kwamita yoyendera ma ultrasound nthawi yoyendera, chifukwa kuchuluka kwa kayendedwe ka madzi kumawerengedwa kuchokera ku kusiyana pakati pa nthawi yoyendera madzi ya pamwamba ndi pansi pa madzi. Mu mkhalidwe wabwino kwambiri wa zero-flow, nthawi ziwiri zoyendera ziyenera kukhala zofanana. Komabe, m'zochita, kusiyana pang'ono kungachitike chifukwa cha mikhalidwe yoyikira, mikhalidwe yamadzimadzi, kugwedezeka kwa chitoliro, khalidwe la chizindikiro, ndi zolakwika zoyezera zamagetsi.

1. Chitolirocho Sichingakhale Pa Zero Flow

Choyamba chofufuza ndi ngati chitolirocho chili pa zero.

Kuyenda pang'ono kungakhalepobe chifukwa cha:

• Kutayikira kwa valavu
• Kusiyana kwa kuthamanga pakati pa magawo awiri a dongosolo
• Kuzungulira kwachilengedwe
• Kutentha kwa convection m'makina amadzi otentha
• Kuyenda kodutsa
• Kuzungulira kwa magazi koyambitsidwa ndi pampu
• Kuyenda kotsalira pambuyo poti pampu yasiya kugwira ntchito

Mwachitsanzo, choyezera kuchuluka kwa madzi m'thupi (flow meter) chingasonyeze0.05 m/spambuyo poti pampu yazimitsidwa. Izi sizikutanthauza kuti choyezera madzi chili ndi vuto la zero-point. Pakhoza kukhalabe madzi ochepa omwe akuyenda mu chitolirocho.

Chifukwa chake,Kuyesa kwa zero-point kuyenera kuchitika pokhapokha mutatsimikizira kuti chitolirocho chili chokhazikika komanso chodzazidwa ndi madzi.

2. Kukhazikitsa Transducer Yosayenerera

Pa zoyezera kuyenda kwa ma ultrasound zomwe zimayikidwa pa clamp-on, kuyika kwa transducer kumakhudza kwambiri kukhazikika kwa muyeso.

Mavuto angachitike ngati:

• Ma transducers sali bwino.
• Malo olumikizirana ndi transducer ndi olakwika.
• Ma transducer awiriwa ali ndi mikhalidwe yosiyana yolumikizirana.
• Ma transducer amaikidwa pa ngodya yolakwika.
• Malo oikirapo ali ndi vuto kapena ali osafanana.
• Njira yokhazikitsira yomwe yasankhidwa siyikugwirizana ndi momwe mapaipi amagwirira ntchito.

Mavuto amenewa angapangitse kuti ma acoustic signals a pamwamba ndi pansi azichita zinthu mosiyana.

Motero, choyezera kayendedwe ka madzi chikhoza kuzindikira kusiyana pang'ono kwa nthawi yoyendera ngakhale pamene palibe kayendedwe ka madzi kwenikweni.

3. Kugwedezeka kwa Chitoliro Kungayambitse Chizindikiro Chooneka Ngati Chikuyenda

Kugwedezeka kwa makina ndi chifukwa china chomwe chingayambitse kusakhazikika konse.

Ngati choyezera kuchuluka kwa madzi chayikidwa pafupi ndi:

• Mapampu
• Ma compressor
• Ma mota akuluakulu
• Mavavu
• Zipangizo zina zogwedeza

kugwedezeka kungakhudze kulumikizana pakati pa transducer ndi khoma la chitoliro.

Ikhozanso kuyambitsa phokoso mu chizindikiro cha ultrasound chomwe chalandiridwa.

Chizindikiro chodziwika bwino ndichakuti kuchuluka kwa madzi omwe akuwonetsedwa sikumakhalabe pa zero yokhazikika, koma m'malo mwake kumasintha mozungulira zero, mwachitsanzo:

0 → 0.03 → -0.02 → 0.05 → 0 m/s

Pachifukwa ichi, kusintha mfundo ya zero mobwerezabwereza sikungathetse vuto lenileni. Malo okhazikitsa ayenera kufufuzidwa kaye.

4. Mabowo a Mlengalenga Angakhudze Chizindikiro cha Ultrasonic

Ma thovu a mpweya ndi chimodzi mwa zifukwa zomwe zimachititsa kuti muyeso wa ultrasound usakhazikike.

Popeza mphamvu ya mpweya ndi madzi imasiyana kwambiri, thovu limatha kufalitsa ndikuchepetsa chizindikiro cha ultrasound pamene likuyenda mu chitoliro.

Izi zitha kubweretsa:

• Mphamvu ya chizindikiro yotsika
• Ubwino wa chizindikiro chosakhazikika
• Kuzindikira nthawi yoyendera yolakwika
• Kuwerenga kwa kayendedwe ka nthawi ndi nthawi
• Kusinthasintha kwa mawerengedwe a zero-point

Ichi ndichifukwa chake chitolirocho chiyenera kukhalawodzazidwa kwathunthu ndi madzi, ndipo ma transducer sayenera kuyikidwa pamalo omwe mpweya umasonkhana.

5. Kusintha kwa Kutentha kwa Madzi

Kusintha kwa kutentha kungakhudzenso kukhazikika kwa mfundo zosapitirira zero.

Kusintha kwa kutentha kumasintha madzi:

• Liwiro la mawu
• Kuchulukana
• Kukhuthala

Nthawi yomweyo, kukulitsa kutentha kumatha kusintha pang'ono kukula kwa chitoliro ndi njira ya mawu.

Ngakhale njira yoyendera nthawi imadalira kwambiri kusiyana pakati pa nthawi yoyendera yopita kumtunda ndi yopita kumtunda m'malo mwa liwiro lenileni la phokoso, kusintha kwakukulu kwa momwe zinthu zimagwirira ntchito kungakhudzebe ubwino wa chizindikiro ndi kukhazikika kwa muyeso.

Izi ndizofunikira kwambiri pakugwiritsa ntchito madzi otentha, madzi ozizira, ndi zakumwa zina zomwe kutentha kwake kumasinthasintha kwambiri.

6. Zolakwika pakugwiritsa ntchito zamagetsi ndi zizindikiro

Kusiyana kwa nthawi yoyendera yomwe imayesedwa ndi chipangizo choyezera kuyenda kwa madzi (ultrasound flow meter) kungakhale kochepa kwambiri, makamaka ngati kuthamanga kwa madzi kuli kochepa.

Choncho, njira yoyezera iyenera kudziwa molondola kusiyana kochepa kwambiri pa nthawi yoyendera ya ultrasound.

Zinthu monga:

• Phokoso lamagetsi
• Kukhazikika kwa wotchi
• Kuzindikira zizindikiro
• Zotsatira za kutentha pa zida zamagetsi
• Ma algorithms opangira zizindikiro
• Kukhazikika kwa dera lotumizira

zingakhudze muyeso pafupi ndi mfundo ya zero-flow.

Ichi ndi chimodzi mwa zifukwa zomwe magwiridwe antchito a ultrasound flow meter samadalira kokha pa ma transducer ake, komanso mtundu wakukonza zizindikiro ndi njira yoyezera nthawi.

7. Chifukwa Chake Kukonza Zero Sikuli Njira Yabwino Nthawi Zonse

Cholakwika chofala kwambiri ndikuchita nthawi yomweyo kuwerengera zero nthawi iliyonse pamene mita yoyezera madzi ikuwonetsa kuyenda pang'ono pa nthawi ya kuyenda kwa zero.

Tiyerekeze kuti kuyenda kwenikweni ndi zero, koma mita ikuwonetsa nthawi zonse:

+0.08 m/s

Kuyesa kwa zero kungachepetse bwino mtengo wowonetsedwa kufika pa zero.

Komabe, ngati chifukwa chenicheni ndi thovu la mpweya, kugwedezeka, kusakhazikika bwino kwa transducer, kapena kutuluka kwa valavu, cholakwikacho sichingakhale chokhazikika.

Mwachitsanzo, kuwerenga kungasinthe kuchokera ku:

+0.08 m/s → -0.03 m/s → +0.05 m/s

Pankhaniyi, zero calibration sizingathetse vuto lenileni.

Njira yabwino yothetsera mavuto ndi:

Tsimikizirani kuti palibe kuyenda kwa madzi → Yang'anani momwe chitoliro chilili → Yang'anani kuyika kwa transducer → Yang'anani mphamvu ya chizindikiro → Yang'anani ngati pali thovu la mpweya ndi kugwedezeka → Yang'anani momwe kutentha kulili → Chitani kuwerengera kwa zero ngati pakufunika kutero

8. Momwe Mungasiyanitsire Mitundu Yosiyanasiyana ya Mavuto a Zero-Point

Kuthamanga kwa zero-point mu ultrasound flow meter ndisikuti kwenikweni imayambitsidwa ndi mfundo ya zero yamagetsi yokha.

Mu ntchito zambiri zenizeni, zomwe zimawoneka ngati zero-point drift kwenikweni zimakhala zotsatira za kuphatikiza kwakuyenda kochepa kwenikweni, kuyika kwa transducer, kugwedezeka kwa mapaipi, thovu la mpweya, kusintha kwa kutentha, mtundu wa chizindikiro, ndi kukhazikika kwa muyeso wamagetsi.

Choncho, njira yoyenera si kungosintha mfundo ya zero. Katswiri wa mainjiniya ayenera choyamba kuzindikira ngati vutolo likuchokera kuchitoliro, madzimadzi, kukhazikitsa, chizindikiro cha mawu, kapena zamagetsi.

Kuti muwonetsetse kuti ma flow meters a ultrasound akugwiritsidwa ntchito, onaniMphamvu ya Chizindikiro, kukhazikika kwa chizindikiro, mtunda wa transducer, momwe chitoliro chilili, ndi mtundu wa cholumikizirandikofunikira kwambiri musanachite zero calibration.