He whakatau nui te haumi ki tētahi mita rere ultrasonic mō ngā ahumahi mai i te maimoatanga wai ki te hinu me te hau, nā te mea ka pā tika ki te whai huatanga o te mahi, te tika o te ine, me te whai huatanga utu mō te wā roa. He rerekē ki ngā mita rere tuku iho, ka whakawhirinaki ngā tauira ultrasonic ki te hangarau ngaru oro—ka whakawhirinaki nui tā rātou mahi ki ngā whakaritenga hangarau motuhake. Mā te kore e aro ki ngā tawhā matua ka arahi pea ki ngā taputapu kāore i te ōrite, te wā kore mahi, te kore rānei e tutuki i ngā paerewa ahumahi. Hei whakarite i tētahi haumitanga rautaki, me whakarite e ngā kaihoko ngā whakaritenga matua e ono e hangai ana ki ā rātou hiahia tono ahurei.
Tuatahi, ko te tika o te ine me te auautanga o te ine he mea kāore e taea te whiriwhiri. Ko te tika e pā ana ki te tata o te ōrite o ngā pānui o te mita ki te tere rere o te wai tuturu, e whakaatuhia ana hei ōrau o te tauine katoa (hei tauira, ±0.5% o te FS) he ōrau rānei o te pānui (hei tauira, ±0.2% o te pānui). He rerekē, ko te auautanga o te ine i te ōritetanga o ngā pānui i raro i ngā āhuatanga ōrite—he mea nui mō ngā tukanga e hiahia ana ki ngā raraunga pumau, matapaetia (pērā i te hanga rongoā, i te inenga matū rānei). Mō ngā wai ma pērā i te wai inu, he maha ngā wā ka tukuna e ngā mita rere ultrasonic wā-haere te tika i roto i te ±0.5%, ko ngā tauira Doppler (mō ngā wai kapi i ngā matūriki pērā i te wai para) ka rerekē mai i te ±1% ki te ±3%. Me karo ngā kaihoko i te tino tika (e piki ake ai ngā utu) engari me whakarite kia tutuki i ngā whakaritenga ture—hei tauira, me whai tika ngā kamupene hinu me te hau ki te ISO 5167 mō te whakawhiti tiaki.
Tuarua, ko te hototahitanga o te wai ka whakatau mēnā ka taea e te mita te tu atu ki ngā āhuatanga o te wai e inehia ana. E rua ngā whakaritenga matua i konei ko te rauemi mākū me te awhe pāmahana/pēhanga. Me ātete ngā wāhanga mākū (ngā wāhanga e pā tika ana ki te wai) ki te waikura, ki te horo, ki te pirau matū rānei. Mō ngā wai kaha pēnei i te waikawa, i te whakarewa rānei, he pai ngā mita me ngā wāhanga mākū i hangaia ki te PTFE, ki te PFA rānei, ko te maitai kore waikura ia e mahi ana mō ngā wai kūpapa pēnei i te wai. Hei tāpiri, me ōrite ngā awhe pāmahana me te pēhanga mahi o te mita ki ngā āhuatanga o te tukanga: ka rahua te mita rere i whakatauria mō te -20°C ki te 80°C i roto i ngā tono pāmahana teitei pēnei i ngā raina mamaoa, pērā i te mea i hangaia mō te pēhanga 10 pae kāore e taea te whakahaere i ngā paipa hinu moana e mahi ana i te 100 pae. Ko ngā whakatauranga pāmahana/pēhanga kāore i te ōrite, ehara i te mea ka whakaiti noa i te tika, engari ka puta hoki he mōrearea haumaru pēnei i te turuturu, te rahunga rānei o te wāhanga.
Tuatoru, ko te rahi o ngā paipa me te ngāwari o te tāutanga ka pā tika ki te whakamahinga. Kei te wātea ngā mita rere ultrasonic mō ngā diameter paipa mai i te 10 mm (mō te whakamahinga taiwhanga) ki te 3,000 mm (mō te tohatoha wai nui). Mā te whiriwhiri i te rahi hē ka hua ake ngā pānui hē—hei tauira, ka uaua te ine i te rere i roto i ngā paipa 500 mm i te mita i hangaia mō ngā paipa 50 mm nā te he o te tohu. Ko te momo tāutanga (whakapiripiri me te whakarārangi) tētahi atu mea nui: kāore ngā tauira whakapiripiri e pokanoa, kāore e hiahiatia he tapahi paipa, ā, he pai mō ngā whakahoutanga, ngā paipa ngawari rānei (hei tauira, PVC), ko ngā tauira whakarārangi he nui ake te tika mō ngā tukanga nui engari me kati mō te tāutanga. Me tirotiro hoki e ngā kaihoko mēnā ka tautoko te mita i te tāutanga whakapae/poutū, nā te mea he kino te mahi a ētahi tauira ina whakairihia poutū me te rere ki raro.
Tuawhā, mā ngā kawa whakaputa me ngā kawa whakawhitiwhiti kōrero ka honoa te mita ki ngā pūnaha o nāianei. He maha ngā putanga e tukuna ana e ngā mita rere ultrasonic hou: he anarohiko (4-20 mA) mō te tuku tere rere i te wā tūturu, he putanga pātere mō te tatau rere katoa, me ngā putanga matihiko (RS485, Modbus, HART rānei) mō te hononga ki te SCADA, PLC, ngā tūāpapa aroturuki kapua rānei. Mō ngā wheketere atamai, mō ngā wāhi mamao rānei, he mea nui ngā kawa ahokore pēnei i te LoRaWAN, Wi-Fi rānei hei whakahohe i te urunga raraunga mamao me te tiaki matapae. Ki te kore he kōwhiringa whakawhitiwhiti kōrero hototahi, me whai urutau utu nui, me whakauru raraunga ā-ringa rānei te mita, ka whakararu i te whai huatanga o te mahi.
Tuarima, he mea nui ngā whakaritenga hiko me te pakari o te taiao mō ngā taiao uaua, kore-pūnaha rānei. Ko te nuinga o ngā mita ahumahi e rere ana i runga i te 24 VDC, 110/230 VAC rānei, engari kei te wātea ngā tauira pākahiko mō ngā wāhi tawhiti (hei tauira, ngā paipa wai taiwhenua) ā, ka taea te mahi mō te 5-10 tau i runga i te pākahiko kotahi. Ka inehia te pakari o te taiao mā ngā whakatauranga tiaki urunga (IP) me te awhe pāmahana whakahaere: ka whakarite te whakatauranga IP68 i te ātete puehu me te ruku wai, kia pai ai mō ngā wāhi o waho, mākū rānei, ko te whakatauranga IP65 ia e mahi ana mō ngā taiao puehu o roto. Mō te tino makariri (hei tauira, ngā mara hinu Arctic) te wera rānei (hei tauira, ngā tipu hiko o te koraha), me whakamahi ngā mita me ngā awhe pāmahana roa (-40°C ki te 120°C) hei karo i te pakaru o ngā wāhanga hiko.
Hei whakamutunga, ka pāngia te uara mō te wā roa e ngā hiahia tiaki me te utu o te huringa ora. He iti ake ngā wāhanga neke o ngā mita rere ultrasonic i ngā mita tāpine, engari me tirotiro tonu i ia wā—pēnei i te whakatikatika i ngā transducers, i ngā pūoko horoi rānei (mō ngā tauira Doppler). Me whakarite e ngā kaihoko ngā wā tiaki (hei tauira, te whakatikatika ā-tau me te whakatikatika ā-rua tau) me ngā utu, tae atu ki te wātea o ngā wāhanga whakakapinga. Ko te mita he iti ake te utu o mua engari he maha, he utu nui te tiaki, ka nui ake pea te utu mō te 5-10 tau i te mita he utu nui ake, he iti te tiaki.
Hei whakamutunga, ko te haumi ki tētahi mita rere ultrasonic me arotahi ki ngā whakatakotoranga e hangai ana ki ngā hiahia tono—mai i te tika me te hototahi wai ki ngā kawa whakawhitiwhiti kōrero me te utu huringa ora. Mā te karo i ngā whakataunga kotahi-rahi-e-katoa, me te whakarite i ngā tawhā e pā tika ana ki te mahi me te tutuki i ngā whakaritenga, ka taea e ngā kaihoko te whiriwhiri i tētahi mita e tuku raraunga pono ana, e whakaiti ana i te wā kore mahi, ā, e whakarato ana i te uara mō te wā roa. I tēnei wā e piki haere ana te aunoatanga ahumahi, ehara i te mea he taputapu ine noa te mita rere ultrasonic tika—he pou tūāpapa mō ngā mahi whai hua, pumau hoki.
Wā tuku: Hepetema-25-2025