Iitransmitha zoxinzelelo zizinto ezibalulekileyo kwizicelo zemizi-mveliso ezilinganisa ubungakanani bomzimba obungengowombane, njengobushushu, uxinzelelo, isantya kunye ne-engile. Ngokuqhelekileyo, ii-4-20mA transmitters ziza kwiintlobo ezintathu: ii-four-wire transmitters (iingcingo zombane ezimbini kunye neengcingo ezimbini eziphumayo zangoku), ii-transmitter ze-3-three (imveliso yangoku kunye nokunikezelwa kwamandla babelana ngocingo olunye), kunye nee-transmitter ezimbini.
Kweli nqaku, siza kuxubusha iingenelo zeentambo ezimbini zoxinzelelo, uhlobo loxinzelelo oluye lwafumana ukuthandwa kwiminyaka yamuva. Nazi ezinye zezibonelelo eziphambili zeentambo ezimbini zokuhambisa uxinzelelo:
1. Ukungenwa kancinci kwi-parasitic thermocouples kunye ne-voltage drops: I-two-wire pressure transmitters ayinakuchaphazeleka kancinci kwi-parasitic thermocouples kunye ne-voltage yehla ecaleni kocingo, okubavumela ukuba basebenzise iingcingo ezincinci, ezingabizi kakhulu. Oku kunokugcina ixabiso elibalulekileyo lekhebula kunye neendleko zokufakela.
2. Ukuphazamiseka kwe-electromagnetic okucuthiweyo: Xa ukuchasana kwemveliso yomthombo wangoku kukhulu ngokwaneleyo, umbane owenziwe yimagnethi edibanisa kwiluphu yocingo ayibalulekanga ngokubanzi. Oku kungenxa yokuba umthombo wokuphazamiseka ubangela umsinga omncinci onokuncitshiswa kusetyenziswa iintambo ezijijekileyo.
3. Ubude bekhebula elide: Ukuphazamiseka kwe-capacitive kunokubangela iimpazamo ekuchaseni ummkeli. Nangona kunjalo, kwi-4-20mA i-loop yocingo olubini, ukuchasana kommkeli ngokuqhelekileyo yi-250Ω, encinci ngokwaneleyo ukuvelisa iimpazamo ezingabalulekanga. Oku kuvumela ubude beentambo ezinde nangaphezulu xa kuthelekiswa neenkqubo zetelemetry yombane.
4. Ukuguquguquka ekukhethweni kwesiteshi: Iindidi ezahlukeneyo zokubonisa enye okanye izixhobo zokurekhoda zingatshintshwa phakathi kwamajelo ahlukeneyo kunye nobude bekhebula ezahlukeneyo ngaphandle kokubangela ukuchaneka kokuchaneka. Oku kuvumela ukufunyanwa kwedatha enatyisiweyo kunye nolawulo olubekwe kwindawo enye.
5. Ukufumanisa impazamo efanelekileyo: Ukusebenzisa i-4mA ye-zero-level yenza kube lula ukubona iisekethe ezivulekileyo, iisekethe ezimfutshane, okanye umonakalo wenzwa (isimo se-0mA).
6. Kulula ukongeza izixhobo zokukhusela i-surge: Izixhobo zokukhusela i-surgery zinokongezwa ngokulula kwi-port ye-wire output port, eyenza ikhuseleke kwaye ixhathise ngakumbi kumbane kunye nokunyuka.
Ukuqukumbela, abathumeli boxinzelelo lweengcingo ezimbini banikezela ngeenzuzo ezininzi ngaphezulu kwezinye iintlobo zokuhambisa, ezinje ngokuncipha kokungenwa yiparasitic thermocouples kunye nokuhla kwamandla ombane, ukunciphisa ukuphazamiseka kombane, ubude bekhebula ubude, ukuguquguquka ekukhetheni itshaneli, ukufumanisa iimpazamo ezifanelekileyo, kunye nokongezwa ngokulula kotyando. izixhobo zokukhusela. Ngezi zibonelelo, ii-transmitter zoxinzelelo lweengcingo ezimbini ziye zidume ngakumbi kwizicelo zamashishini ezifuna imilinganiselo yoxinzelelo echanekileyo nethembekileyo.
Ixesha lokuposa: Apr-25-2023