Inzwa/Isidluliseli/Isidluliseli Sokucindezela

Abaningi bangase badideke ngomehluko phakathi, inzwa yokucindezela, i-transducer ye-pressure kanye ne-pressure transmitter ngezinga elihlukahlukene. Lawo magama amathathu angashintshaniswa ngaphansi komongo othile. Izinzwa zokucindezela kanye nama-transducer zingahlukaniswa ngesignali yokuphuma. Eyokuqala ingachazwa ngesignali yokuphuma engu-4-20mA kanti eyesibili inesignali ye-millivolt. Ngamanye amazwi, igama elifanele linganqunywa ngokuya ngesignali yokuphuma kanye nokusetshenziswa.

Inzwa Yokucindezela

Inzwa yokucindezela yigama elijwayelekile lazo zonke izinhlobo zokucindezela, idivayisi esetshenziselwa ukukala ingcindezi. Ngokuvamile, isignali yokukhipha i-millivolt igcina isignali eqinile ngaphandle kokulahlekelwa lapho idivayisi enjalo ifakiwe ngamamitha angu-10-20 ukusuka kuma-elekthronikhi. Ukunikezwa kwe-5VDC okunesignali yokukhipha i-10mV/V kukhiqiza isignali yokukhipha i-0-50mV. Ubuchwepheshe obudala bukhiqiza kuphela i-2-3mV/V (millivolts per volt) kuyilapho ubuchwepheshe obusezingeni eliphezulu bukwazi ukukhiqiza i-20mV/V ngokuthembekile. Izimpawu zokukhipha i-Millivolt zishiya izikhala zonjiniyela zokulawula isignali yokukhipha ngokuya ngezidingo ezithile zesistimu futhi zinciphise usayizi wephakheji kanye nezindleko.

I-Pressure Transducer

Ukukhishwa kwe-pressure transducer kuyisignali ye-voltage noma imvamisa ephezulu ehlanganisa i-ratiometric engu-0.5 4.5 V, 1 - 5 V kanye no-1 - 6 kHz. I-output singal ilingana nokunikezwa ngokujwayelekile. Amasignali okukhishwa kwe-voltage ayakwazi ukunikeza ukusetshenziswa kwamanje okuphansi kwemishini esetshenziswa yi-remote batter. Ama-voltage okunikezwayo asukela ku-8-28 VDC adinga ukunikezwa okulawulwa yi-5VDC, ngaphandle kokukhishwa okungu-0.5 - 4.5V. Inkinga enzima yamasignali okukhishwa kwe-voltage amadala ayikho "ku-zero ephilayo", kukhona isignali lapho inzwa ingaphansi kwengcindezi engu-zero. Uhlelo oludala luvame ukwehluleka ukuthola umehluko phakathi kwenzwa ehlulekile engenakho ukuphuma kanye nengcindezi engu-zero.

Umthumeli Wokucindezela

Isithumeli sokucindezela sisebenza ngokulinganisa ugesi wedivayisi esikhundleni se-voltage. Uhlamvu olusobala kakhulu isignali yokukhipha ugesi engu-4-20mA. I-Lonnmeterama-pressure transmitterzenzelwe ukuqapha ingcindezi yemikhumbi, amapayipi noma amathangi ngesikhathi sangempela. Ama-transmitter okucindezela angu-4-20mA anikeza ukungavikeleki kahle komsindo kagesi (EMI/RFI), futhi azodinga ukunikezwa kwamandla okungu-8-28VDC. Ngenxa yokuthi isignali ikhiqiza amandla kagesi, ingadla impilo yebhethri eningi uma isebenza ngengcindezi egcwele.

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