Ngā Take hei Whakaaroaro i te Tāuta i ngā Mita Rere Hikohiko ki ngā Pūnaha Paipa

He whānuitia te whakamahinga o ngā mita rere hikohiko (mita EM) i roto i ngā mahi ahumahi, ā-tāone, me ngā mahi maimoatanga wai nā te mea he tino tika, he kaha ki te whakahaere i ngā wai kawe hiko, me te iti o te hekenga pēhanga. Heoi, ko te mahi a ēnei mita he mea nui ki te tāutanga tika—ahakoa te mita EM tino matatau, kāore e taea te tuku raraunga pono mēnā ka tāutahia he. Mai i ngā āhuatanga o te paipa ki ngā āhuatanga taiao, me aro atu ki ētahi āhuatanga nui kia pai ai te mahi. E whakamārama ana tēnei tuhinga i ngā whakaaro matua mō te tāuta i ngā mita EM ki ngā pūnaha paipa.

1. Ngā Whakaritenga Roa Tika o te Paipa

2. Te Rahi o te Paipa me te Hototahi ki te Mita

• Kaua e whakaiti i te rahi o te mita: Ka hangaia he ara rere whaiti e te mita iti, ka piki ake te tere o te wai me te hekenga o te pēhanga. Ka taea e tēnei te kino i te ara o te mita i roto i te wā, ā, ka puta he pānui rere teitei hē.
• Kaua e rahi rawa te mita: Ka iti te tere o te wai i te mita rahi rawa, inā koa i ngā tere rere iti. Nā te mea ka whakawhirinaki ngā mita EM ki te tere ōrite hei whakaputa i tētahi tohu hikohiko e taea te ine, ka taea e te tere iti te arahi ki ngā pānui kore pumau, ki te kore rānei e kitea katoatia te rere.

  Mena kāore te rahi o te paipa e ōrite ki ngā rahi mita EM paerewa (hei tauira, he paipa 5-inihi kāore he mita e ōrite ana), whakamahia ngā whakaiti, ngā whakawhanui rānei kua tāutahia kia 10D te iti rawa ki runga ake i te mita hei whakawhiti i waenga i ngā rahi. Me whakarite kia porowhita ngā whakaiti (kaua e rerekē) kia kore ai e puta he tohatoha rere koretake.

3. Te Whakakī Wai me te Aronga Tāutanga

• Tāutanga whakapae: Ko te whakatakotoranga pai mō te nuinga o ngā mahi. Whakanohoia te mita kia tū ngā irahiko ki te 45° ki te 90° mai i te raro o te paipa (kaua e tika ki raro). Mā tēnei ka ārai i te pa atu o te irahiko ki te paru, ki ngā para rānei e tau ana ki te turanga o te paipa, ka taea ai te poke. Ka ārai hoki i te kohikohinga o ngā putunga hau i te taha o ngā irahiko (ka piki ake te hau ki te tihi o ngā paipa whakapae).
• Tāutanga poutū: He pai mō ngā tono e rere ana te wai ki runga (kaua rawa e heke iho, nā te mea ka taea e tēnei te hopu i te hau ki te mita). Mā te tāutanga poutū ka kī tonu te paipa, ā, ka āwhina ki te ārai i te hanga paru. Heoi, me whakaū kei te tika te whakatauranga o te mita mō te whakairinga poutū—he here taumaha, he here rānei te ahunga rere o ētahi tauira.
• Kaua e tāuta ki ngā tihi o ngā paipa: Mā te tāuta i te mita ki te wāhi teitei rawa o te paipa ka nui ake te mōrearea o ngā putunga hau. Ki te kore e taea te karo, tāpirihia he pūhau hau ki mua o te mita hei tuku i te hau kua mau.

4. Te Hototahitanga o ngā Rauemi me te Tiakitanga Taiao

• Ngā wāhanga kua mākū: Mō ngā wai waikura (hei tauira, te wai para waikawa, ngā otinga matū), whakamahia ngā arai pēnei i te PTFE (Teflon) FKM (Viton) rānei me ngā irahiko i hangaia ki te Hastelloy C, ki te titanium rānei. Mō ngā wai whakakoi (hei tauira, te paru me ngā mea totoka), whiriwhiria ngā arai whakakaha (polyurethane) hei ātete i te pakaru. Mō te wai inu, me whakarite kia tutuki ngā rauemi i ngā paerewa NSF/ANSI 61, WRAS rānei hei karo i te poke.
• Whare noho o waho: I roto i ngā taiao kino (hei tauira, ngā whakaurunga o waho, ngā whare ahumahi he puehu, he makuku rānei), tīpakohia ngā mita me te whakatauranga IP (Ingress Protection) o te iti rawa IP65 (he ātete puehu, ā, he tiakina mai i ngā pupuhi wai iti-pēhanga). Mō ngā tono ruku wai (hei tauira, ngā paipa raro wai), whakamahia ngā mita kua whakatauranga IP68. I roto i ngā taiao pahū (hei tauira, ngā whare hanga hinu), tīpakohia ngā mita me ngā tiwhikete ATEX, IECEx rānei mō ngā wāhi morearea.

5. Te Whakatakotoranga Hiko me te Ārai i te Whakararuraru

• Te whenua o te mita: Honoa te pūnga whenua o te mita ki tētahi whenua motuhake, he iti te ātete (≤10Ω). Kaua e whakamahia te whenua ki ētahi atu taputapu (hei tauira, ngā motuka, ngā papu), nā te mea ka puta he haruru. Mō ngā paipa kirihou (kāore e kawe hiko), tāutahia he mowhiti whenua (he mowhiti whakarewa e piri ana ki te paipa i runga ake, i raro iho hoki i te mita) ka hono atu ki te whenua o te mita. Mā tēnei ka whakarite kia rite te kaha whenua o te wai ki te mita.
• Whakahaere taura: Whakamahia ngā taura ārai mō te tuku hiko me te tohu (hei tauira, ngā taura anaro 4-20mA, ngā taura matihiko RS485). Araia ngā taura kia matara atu i ngā raina hiko-tiketike (hei tauira, ngā taura hiko 380V) me ngā pūtake hikohiko (hei tauira, ngā puku auau rerekē, ngā motuka) hei karo i te pokanoa. Kia mau ki te tawhiti iti rawa o te 1 mita i waenga i ngā taura mita EM me ngā taura haruru nui.

6. Te Wātea mō te Tiaki me te Whakatikatika

• Whakaratohia he urunga mārama: Me whakarite kia kotahi mita te iti rawa o te wāhi huri noa i te mita kia taea ai e ngā tohunga hangarau te mahi. Mena kei te teitei te mita, whakamahia he papaaho, he arawhata rānei (me ngā āhuatanga haumaru) hei urunga.
• Te whakanohonga o ngā takirere: Tāutahia ngā takirere wehewehe ki runga, ki raro hoki o te mita. Mā ēnei takirere ka taea e ngā tohunga hangarau te kati i te rere o te wai mō te tiaki, te whakakapi rānei, me te kore e aukati i te pūnaha paipa katoa. Whakamahia ngā takirere putanga-katoa hei karo i te aukati i te rere ina tuwhera.
• Ngā whakaaro mō te whakatikatika: Kōwhiria he wāhi e ngāwari ai te hono atu ki ngā taputapu whakatikatika (hei tauira, ngā paerewa rere kawe). Mō ngā paipa nui, kia mōhio kei reira he wāhi hei tāuta i ngā taputapu whakatikatika mō te wā poto.

Whakamutunga