He aha te tohu 4-20mA? Mātauranga taketake mō ngā kaituku taumata wai kōeke ahumahi.
n te āpure o te aunoatanga ahumahi, ko te koromeke o nāianei 4-20mA tētahi o ngā paerewa e tino whakamahia ana mō te tuku tohu tairitenga. Ahakoa mō te taumata, pēhanga, pāmahana, ngā kaituku rerenga rānei, ka kite koe i ngā whakaritenga pēnei i te "Tohu huaputa: 4-20mA." Nā reira, he aha tonu te tohu 4-20mA, he aha hoki i whakamahia nuitia ai i roto i ngā kaituku taumata kōeke ahumahi? Ka whakautu a HojellyTek i ēnei pātai māu i tēnei rā.
- He aha te tohu 4-20mA?
Ko te tohu 4-20mA he tohu tairitenga o nāianei e whakamahia ana hei tuku i te uara ine o tētahi pūoko (pēnei i te teitei o te taumata wai) hei rahinga o nāianei ki tētahi pūmana, taputapu whakaatu, PLC rānei (Ngā Pūmana Arorau Ka Taea te Papatono).
4E ōrite ana te mA ki te awhe mōkito o te pūoko (E.g., ina noho te taumata wai 0%).
E ōrite ana te 20mA ki te awhe mōrahi o te pūoko (E.g., he taumata wai o 100%).
E ōrite ana ngā uara o nāianei takawaenga ki ngā uara inenga mai i 0% ki 100%.
Hei tauira, he kaituku taumata me te awhe o 0-5 ngā ine ka puta mai 12 mA e tohu ana ko te taumata o nāianei ko te 2.5 mita (50%).
2. He aha te 4-20mA kaua ko te 0-20mA?
Kōwhiri ana i te 4mA hei ira kore, kaua ko te 0mA, whai whakaaro pūkaha hira:
| Āhuahira | Whakamāramatanga |
|---|---|
| Haurapa Waea Pakaru | Mēnā ka whakamahia te 0mA hei pūwāhi kore, ina momotu te waea, ka whiwhi hoki te mutunga whiwhi i te 0mA, e kore ai e taea te wehe i waenga i "te taumata wai tūturu he kore" me te "hapa raina." Whakamahi ana i te 4mA, ina kitea e te pito whiwhinga he iahiko < 4engari (pēnei i te 0mA), Ka taea e ia te whakatau kua momotu te raina me te whakaoho i tētahi pūoho. |
| Puna Hiko Pūoko | He maha ngā kaituku waea-rua e whakahikotia hāngai ana e te koromeke tohu (B.C., Ka tuku te koromeke o nāianei i te tohu me te tuku hiko). 4Ka rawaka te mA hei whakahiko i te ara iahiko ā-roto o te kaituku, ahakoa kāore te 0mA e. |
| Ārai Whakararuraru Kaha | He iti iho te mōrearea o ngā tohu o nāianei ki te whakararuraru ā-hiko i ngā tohu ngaohiko, kia pai ai mō te tarenga tawhiti (tae atu ki ngā kiromita maha). |
3. He aha ngā kaituku taumata taumata ahumahi e manako ana i te 4-20mA?
He tino pākaha ngā tono i whakatakotoria ki ngā pūoko i roto i ngā taiao mahi: pāmahana tiketike, haumākū tiketike, whakararu kaha, tawhiti, me te parenga pahūtanga. Kua noho te tohu 4-20mA hei kōwhiringa pai mō ngā kaituku taumata wai kōeke ahumahi nā ngā painga e whai ake nei:
Awhe tarenga roa: He iti noa iho te whakahekenga o te tohu o nāianei i roto i te koromeke, kia ngāwari ai te tuku i roto i ngā kiromita maha.
Ātete tiketike ki te whakararuraru: I nga waahanga ahumahi, Ko ngā mīhini me ngā puku auau tāupe e whakaputa ana i ngā āpure autōhiko kaha. Ka pēhi tika te koromeke o nāianei i te whakararuraru.
Ka whakangāwari te waea waea e rua: Kua pahekotia te raina putanga hiko me te raina tohu, te whakaiti i ngā utu taura me te whakangāwari ake i te tāutanga.
Te Haumaru Matua me te Parenga Pahūtanga: Ina honoa ki ngā ārai haumaru, Ka taea e ia te parenga haumaru tino nui, kia pai ai te whakamahi i roto i ngā taiao mōrearea pēnei i ngā mahi hinu me ngā mahi matū.
Paerewa aowhānui: Ngā PLC, Ngā DCS, me ngā taputapu katoa e haere mai ana me ngā kōwae tāuru 4-20mA, e tuku ana i te hototahitanga tino pai.
4. Ceshhome Industrial Level Transmitter Series
He maha nga tau e tino uru ana a HojellyTek ki te inenga taumata wai, ā, he maha ngā momo kaituku taumata wai kōeke ahumahi e whakarato ana i ngā tohu huaputa o te 4-20mA.
| Rangatū Hua | Mātāpono Ine | Ngakau | Ngā Taupānga Pūnoa |
|---|---|---|---|
| CSP-300 Kaituku Taumata Submersible | Piezoresistive | Ātete waikura, ārai ārai, me te taura kōhao, awhe 0-200m kōwhiri | Ngā poka hōhonu, puna puna, kura parakaingaki |
| CSU-500 Ultrasonic Level Transmitter | Ultranona | Inenga whakapā-kore, ārai poke, me te utu pāmahana, awhe 0-15m | Wai waiwera, waikawa, hongere tuwhera |
| CSR-200 Radar Level Transmitter | FMCW | Tika tiketike ±1mm, kāore i pāngia e te uaua/huka, E tika ana mō te pāmahana/pēhanga tiketike | Ngā kura rokiroki matū, rea |
5. Me pēhea te tīpako me te whakamahi i ngā kaituku taumata 4-20mA
- Whakaū Ngaohiko Putanga: E hiahiatia ana e ngā pūnaha waea-rua te hiko koromeke, ko te tikanga 24V DC; whakaū i te kaha hiko tika.
- Whakaōrite Ātete Uta: Whiwhi ana i ngā pūrere (E.g., Ngā kōwae tairitenga PLC) whai impedance tāuru; me mātua whakarite ka taea e te kaituku te taraiwa.
- Me whai tikanga hei pare i te uira me ngā pahūtanga: Me whakarahia ngā tāutanga o waho ki ngā pūrere parenga uira; mō ngā wāhi mōrea, Whakamahia ngā hoahoa ārai pahūtanga haumaru.
- tōkarikari auau: Ahakoa he tino pūmau ngā hua ahumahi, E taunakitia ana te tōkarikari ā-tau kia mau tonu ai te tika.
Wāhanga whakamutunga
He ngāwari pea te tohu 4-20mA, engari ko tētahi o ngā tūāpapa o te aunoatanga mahi. E tino piri ana ngā kaituku taumata ahumahi Ceshhome ki tēnei paerewa, whakarato i ngā kaiwhakamahi ki te pūmau, pono, me ngā rongoā inenga hototahi. Mēnā kei te rapu koe i ngā kaituku taumata kounga tiketike, whakapā mai ki a mātou!https://www.ceshhome.com/wp-admin/post.php?post=4964&action=edit
