Ngā mita rere hikohiko(EMF) e whakamahia whānuitia ana i roto i ngā tukanga ahumahi nā te mea he tino tika, he pono hoki ki te ine i tetere rereo ngā wai kawe hiko. Ka mahi ēnei mita i runga i te Ture a Faraday mō te Whakaoho Hikohiko, he mātāpono taketake i roto i te hikohiko. Ka whakaratohia e tēnei tuhinga he whakamārama taipitopito mō te mahi a ngā mita rere hikohiko, mai i te ariā matua ki ngā wāhanga mahi me ngā tono.
1. Pūtake Ariā: Te Ture a Faraday mō te Whakaoho Auaha Hiko
E ai ki te Ture a Faraday, ina neke te kaiārahi i roto i te papa aukume, ka puta he kaha hiko (EMF) puta noa i te kaiārahi. I roto i te horopaki o te mita rere hikohiko, ko te wai kawe e rere ana i roto i te mita te mahi hei "kaiārahi," ko te papa aukume o roto o te mita te mahi hei papa aukume o waho. He rite tonu te EMF whakaputa ki te tere o te wai, te kaha o te papa aukume, me te tawhiti i waenga i ngā irahiko e ine ana i te EMF.
I roto i te pāngarau, ka taea te whakapuaki i te Ture a Faraday penei:
E=k×B×v×D
kei hea:
- Ko E te kaha hiko whakaawe (ngaohiko)
- he pūmau te k
- Ko B te kaha o te papa aukume
- Ko v te tere toharite o te wai
- Ko D te diameter o te ngongo ine (e tohu ana i te roa o te ara iahiko i roto i te papa aukume)
Nā te mea kua pumau te kaha o te papa aukume (B) me te whānui o te ngongo (D) mō tētahi mita rere kua hoatu, ka noho te ngaohiko whakaoho (E) hei ine tika mō te tere o te wai (V). Mā te whakauru i te tere i roto i te wā, ka taea te tatau i te tere rere (te rōrahi mō ia wae wā).
2. Ngā Wāhanga Ā-tinana o te Mita Rere Hikohiko
Ngā Koiri Aukume, te Huinga Aukume rānei
Temita rerekei roto he huinga koiri aukume, he huihuinga aukume tuturu rānei e whakaputa ana i tētahi papa aukume ōrite e poutū ana ki te ahunga o te rere o te wai. Ka taea te DC (aukume tika) te AC rānei (aukume whakawhiti), ā, he nui ake te kitea o ngā papa AC nā te kaha ki te whakaiti i te pōraritanga hiko me te pokanoa haruru. Ina whakamahia he papa aukume AC, ka rerekē anō hoki te EMF i puta i roto i te wai i roto i te sinusoid, e māmā ake ai te tukatuka tohu.
Ngongo Ine
Ko te ngongo ine te wāhanga e rere ai te waireres. He mea hanga i ngā rauemi kore-aukume, kore-arataki (pērā i te maitai kore-waikura kua whakakikoruatia ki te PTFE, te rapa, te uku rānei) hei ārai i te pokanoa ki te papa aukume, hei whakarite hoki i te ine tika. He maeneene te mata o roto o te ngongo hei whakaiti i te waku me te ngaronga pēhanga, kia rere noa ai te wai.
Ngā hikohiko
E rua ngā irahiko e tū ana tetahi ki tetahi i runga i te pakitara o te ngongo ine, e tū poutū ana ki te ahunga o te rere o te wai me te papa aukume. Kei te pā tika ēnei irahiko ki te wai, ā, e whakamahia ana hei kite i te EMF i puta mai. Ko te tikanga, he mea hanga ngā irahiko ki ngā rauemi ātete-waikura (hei tauira, Hastelloy, konukōre konukōre-iridium) hei ātete ki ngā momo wai, inā koa ko ērā he āhuatanga kaha, he waikura rānei.
Kaitahuri Tohu
Ko te EMF i puta mai i ngā irahiko he tohu hiko ngoikore rawa, he maha ngā wā kei roto i te awhe microvolt. Ko te kaitahuri tohu, e mōhiotia ana ko te tuku, ka whakanui, ka tātari, ka tukatuka i tēnei tohu hei huri i a ia hei putanga whai hua. Ka taea e ia te huri i te tohu ki ngā whakatakotoranga putanga ahumahi paerewa pēnei i ngā koropiko iahiko 4 - 20 mA, ngā tohu matihiko (hei tauira, HART, Modbus), ka whakawhitiwhiti ahokore rānei ki ngā pūnaha whakahaere, ka taea ai te aroturuki me te whakahaere i te tere rere i te wā tūturu.
3. Tukanga Whakahaere Hipanga-i-te-Taumata
- Te Whakaputa i te Papa Aukume: Ka hangaia e ngā koiri aukume, e te huihuinga aukume rānei, he papa aukume pumau puta noa i te ngongo ine. He poutū tēnei papa ki te ahunga o te rere o te wai, kia tika ai te tapahi a te wai kawe hiko e neke ana i roto i te ngongo i ngā rārangi kaha aukume.
- Te Whakaoho i te EMF: I te rere o te wai kawe hiko i roto i te ngongo ine, ka mahi hei kawe hiko neke i roto i te papa aukume. E ai ki te Ture a Faraday, ka whakaohohia he kaha hiko (EMF) puta noa i te wai. Ko te rahi o tēnei EMF he rite ki te tere o te wai, te kaha o te papa aukume, me te diameter o te ngongo ine.
- Te Kimi Tohu: Ka kitea te EMF i puta mai i ngā irahiko e rua kua whakanohoia ki te pakitara o te ngongo. Nā te mea kei te pā ngā irahiko ki te wai, ka hopukina e rātou te rerekētanga pūmanawa hiko i puta mai i te wai e neke ana i roto i te papa aukume.
- Te Tukatuka Tohu: Ka tukuna te tohu EMF ngoikore i kitea e ngā irahiko ki te kaitahuri tohu. I konei, ka whakanuia te tohu hei whakanui ake i tōna kaha, ka tātarihia hei tango i te haruru me te pokanoa, ā, ka hurihia hei tohu putanga paerewa (hei tauira, 4 - 20 mA, raraunga matihiko).
- Tātaitanga Rere Rere: Kātahi ka whakamahia te tohu kua tukatukahia hei tātai i te tere rere o te wai. Ka whakamahia e te kaitahuri tohu ngā rauropi pāngarau e hangai ana ki ngā pūmau e mōhiotia ana o te mita rere (te kaha o te papa aukume, te diameter o te ngongo) hei huri i te EMF i inehia hei uara tere rere, ka taea te whakaatu ā-rohe ki te mita, te tuku rānei ki tētahi pūnaha aroturuki mamao.
4. Ngā Whakaaro Matua me ngā Here
Te Whakaritenga mō te Arahi Wai
Ngā mita rere hikohikoka taea anake te ine i te rere o ngā wai kawe hiko. Ka rerekē te iti rawa o te kawe hiko e hiahiatia ana i runga i te kaihanga engari i te nuinga o te wā kei waenga i te 5 ki te 50 μS/cm (micro - Siemens ia henimita). Ko ngā wai he tino iti te kawe hiko, pērā i te wai tino parakore, i ngā warowaihā rānei, kāore e pai mō te ine me ngā EMF paerewa. Heoi, ka taea e ngā tauira motuhake i hangaia mō ngā wai he iti te kawe hiko te whakawhānui ake i te whānuitanga ine.
Te Whakararuraru o te Papa Aukume
Ka taea e ngā papa aukume o waho te whakararuraru i te mahi a ngā mita rere hikohiko. Hei whakaiti i tēnei, he mea nui te tiaki tika me te tūnga whenua o te mita. Hei tāpiri, me āta whiriwhiri te wāhi tāutanga kia kore ai e tata ki ngā taputapu hiko nui, ki ētahi atu pūtake rānei o ngā papa aukume.
Tāutanga me te Whakatikatika
He mea nui te tāutanga tika mō te ine tika.mita rereMe tāuta ki tētahi wāhanga tika o te paipa me te roa o ngā paipa tika o runga me raro (ko te tikanga he 5 - 10 ngā wā o te diameter o te paipa o runga, ā, he 3 - 5 ngā wā o raro) kia mau ai te rere pumau me te ōrite. Me whakatikatika auau, mā te manatoko i te wāhi, mā te whakataurite rānei ki ngā paerewa rere e mōhiotia ana, kia mau tonu ai te tika o te ine i roto i te wā.
Hei whakamutunga, ka whakamahia e ngā mita rere hikohiko te Ture a Faraday mō te Whakaoho Hikohiko hei whakarato i te tika me te pono.ngā inenga reremō ngā wai kawe hiko. He mea nui te mārama ki te kaupapa mahi mō te whiriwhiri tika, te tāutanga, me te whakahaere i roto i ngā momo ahumahi, mai i te maimoatanga wai me te tukatuka matū ki te hanga kai me te inu.
Wā tuku: Pipiri-24-2025