Izinhlobo zama-pressure transmitters

Ukuzethula okulula kwesidlulisi somfutho

Njengenzwa yokucindezela okukhiphayo kuyisignali evamile, isidlulisi sokucindezela siyithuluzi elamukela ukuguquguquka kokucindezela futhi likuguqulele kusignali evamile yokuphumayo ngesilinganiso. Ingakwazi ukuguqula amapharamitha wokucindezela ngokomzimba wegesi, uketshezi, njll. ezwe inzwa yeseli yomthwalo ibe amasignali kagesi ajwayelekile (afana ne-4-20mADC, njll.) ukuze inikeze amathuluzi esibili afana nokukhombisa ama-alamu, amarekhodi, izilawuli, njll. zokulinganisa nezinkomba Kanye nokulawulwa kwenqubo.

Ukuhlukaniswa kwama-pressure transmitters

Imvamisa ama-pressure transmitter esikhuluma ngawo ahlukaniswa ngokwesimiso:
Ama-Capacitive pressure transmitter, ama-resistsive pressure transmitter, ama-inductive pressure transmitter, ama-semiconductor pressure transmitters, nama-piezoelectric pressure transmitters ukuze kukale imvamisa ephezulu. Phakathi kwazo, ama-resissive pressure transmitters asetshenziswa kakhulu. I-capacitive pressure transmitter ithatha i-Rosemount's 3051S transmitter njengommeleli wemikhiqizo esezingeni eliphezulu.

Ama-pressure transmitters angahlukaniswa abe yinsimbi, i-ceramic, i-silicon ehlakazekile, i-silicon ye-monocrystalline, isafire, ifilimu e-sputtered, njll. ngokuvumelana nezingxenye ezizwelayo zokucindezela.

• I-metal pressure transmitter inokunemba okungalungile, kodwa inomthelela omncane wokushisa, futhi ifanele izindawo ezinebanga elibanzi lokushisa kanye nezidingo zokunemba okuphansi.
• Izinzwa ze-Ceramic pressure zinokunemba okungcono, kodwa zithinteka kakhulu izinga lokushisa. I-Ceramics nayo inenzuzo yokumelana nomthelela nokumelana nokugqwala, okungasetshenziswa emkhakheni wokuphendula.
• Ukunemba kokudluliselwa kwengcindezi ye-silicon esabalele kuphezulu kakhulu, futhi izinga lokushisa liphezulu futhi kukhulu, ngakho-ke isinxephezelo sezinga lokushisa ngokuvamile siyadingeka ngaphambi kokuba sisetshenziswe. Ngaphezu kwalokho, ngisho nangemva kwesinxephezelo sokushisa, ingcindezi engaphezu kuka-125 ° C ayikwazi ukulinganiswa. Kodwa-ke, ekamelweni lokushisa, i-coefficient yokuzwela ye-silicon ehlukanisiwe iphindwe izikhathi ezingu-5 kune-ceramics, ngakho-ke ivame ukusetshenziswa emkhakheni wokulinganisa ukunemba okuphezulu.
• I-Single crystal silicon pressure transmitter iyinzwa enembe kakhulu ekusebenzeni kwezimboni. Kuyinguqulo ethuthukisiwe ye-silicon ehlakazekile. Yiqiniso, intengo nayo ithuthukisiwe. Njengamanje, i-Yokogawa yaseJapane ingummeleli emkhakheni we-monocrystalline silicon pressure.
• I-sapphire pressure transmitter ayizweli ekushintsheni kwezinga lokushisa, futhi inezici ezinhle zokusebenza ngisho nangaphansi kwezimo zokushisa eziphezulu; isafire inokumelana nemisebe enamandla kakhulu; akukho pn drift; ingasebenza ngokujwayelekile ngaphansi kwezimo ezimbi kakhulu zokusebenza futhi inokwethenjelwa Ukusebenza okuphezulu, ukunemba okuhle, iphutha elincane lokushisa, kanye nokusebenza kwezindleko eziphezulu.
• I-sputtering yefilimu encane yokucindezela i-pressure transmitter ayinayo into enamathelayo, futhi ibonisa ukuzinza nokuthembeka okuphezulu kwesikhathi eside kunenzwa yokukala okunamathelayo; ayithintwa kancane izinga lokushisa: lapho izinga lokushisa lishintsha ngo-100 ℃, i-zero drift ingu-0.5% kuphela. Ukusebenza kwayo kwezinga lokushisa kuphakeme kakhulu kune-diffusion silicon pressure sensor; ngaphezu kwalokho, ingathintana ngqo nemidiya evamile egqwalayo.

Izimiso zezinhlobo ezahlukene zama-pressure transmitters

• Umgomo we-capacitive pressure transmitter.

Lapho ukucindezela kusebenza ngokuqondile ebusweni be-diaphragm yokulinganisa, i-diaphragm ikhiqiza ukuguqulwa okuncane. Isekhethi enembayo ephezulu ku-diaphragm yokulinganisa iguqula lokhu kuguquguquka okuncane kube amandla kagesi alayini kakhulu ngokulingana nokucindezela futhi ngokulingana ne-voltage evusa amadlingozi. Isiginali, bese usebenzisa i-chip ezinikele ukuguqula lesi siginali kagesi ibe isignali evamile yemboni engu-4-20mA noma isignali yamandla kagesi engu-1-5V.

• Umgomo we-diffused silicon pressure transmitter

Ukucindezela kwendawo elinganisiwe kusebenza ngokuqondile ku-diaphragm yenzwa (ngokuvamile i-diaphragm engu-316L), okubangela ukuthi i-diaphragm ikhiqize ukugudluka okuncane ngokulingana nokucindezela kwendawo ephakathi, iguqule inani lokumelana lenzwa, futhi iyithole ngesekethe ye-Wheatstone Lolu shintsho, futhi luguqule futhi lukhiphe isignali yokulinganisa ejwayelekile ehambisana nalokhu kucindezela.

• Isimiso se-monocrystalline silicon pressure transmitter

Izinzwa zokucindezela kwe-piezoresistive zakhiwa kusetshenziswa umphumela we-piezoresistive we-silicon eyodwa yekristalu. I-crystal silicon wafer eyodwa isetshenziswa njengento enwebekayo. Lapho ingcindezi ishintsha, i-silicon eyodwa ye-crystal ikhiqiza ubunzima, ukuze ukumelana nokucindezeleka okusakazeke ngokuqondile kuyo kukhiqiza ushintsho ngokulingana nengcindezi elinganisiwe, bese isignali ehambisanayo yokuphuma kwe-voltage itholwa yisekethe yebhuloho.

• Isimiso se-ceramic pressure transmitter

Ukucindezela kusebenza ngokuqondile endaweni engaphambili ye-ceramic diaphragm, okubangela ukuguqulwa okuncane kwe-diaphragm. I-resistor ewugqinsi yefilimu iphrintwa ngemuva kwe-diaphragm ye-ceramic futhi ixhunywe ebhulohweni le-Wheatstone (ibhuloho elivaliwe) ngenxa yomphumela we-piezoresistive we-varistor , Ibhuloho likhiqiza isignali ye-voltage eqondile kakhulu ngokulingana nokucindezela nokulingana nomthamo we-excitation voltage. Ngokuvamile esetshenziselwa ukulinganisa ingcindezi ye-compressor yomoya, i-ceramics eyengeziwe isetshenziswa.

• Isimiso se-strain gauge pressure transmitter

Ama-transmitter womfutho we-strain gauge asetshenziswa kakhulu amageji okumelana nensimbi nama-semiconductor strain gauge. I-Metal resistance gauge iwuhlobo lwedivayisi ezwelayo eguqulela ushintsho lwenkinga esiqeshini sokuhlola lube isignali kagesi. Kunezinhlobo ezimbili ze-wire strain gauge kanye ne-metal foil strain gauge. Ngokuvamile i-strain gauge iboshelwa ngokuqinile ku-matrix ye-mechanical strain nge-adhesive ekhethekile. Lapho i-matrix ibhekene noshintsho lwengcindezi, igeji ye-resistor gauge nayo iyawohloka, ukuze inani lokumelana legeji yobunzima lishintshe, ukuze I-voltage esetshenziswa ku-resistor ishintshe. Ama-transmitters we-strain gauge pressure ayivelakancane uma kuqhathaniswa emakethe.

• I-Sapphire pressure transmitter

Isidluliseli somfutho wesafire sisebenzisa isimiso sokusebenza sokumelana nobunzima, samukela izingxenye ezizwelayo ze-silicon-sapphire ezinembayo, futhi siguqule isignali yokucindezela ibe isignali kagesi evamile ngokusebenzisa isekethe ye-amplifier ezinikele.

• I-sputtering film pressure transmitter

Isici esizwela umfutho we-sputtering sikhiqizwa ubuchwepheshe be-microelectronics, sakha ibhuloho eliqinile futhi elizinzile le-Wheatstone ebusweni be-diaphragm yensimbi engenasici. Lapho ingcindezi yendawo elinganisiwe isebenza kudiaphragm yensimbi engagqwali enwebekayo, ibhuloho le-Wheatstone ngakolunye uhlangothi likhiqiza isignali yokuphuma kukagesi ngokulingana nokucindezela. Ngenxa yokumelana kwawo nomthelela omuhle, amafilimu ane-sputtered avame ukusetshenziswa ezikhathini ezinemithelela evamile yengcindezi, njengemishini ye-hydraulic.

Izinyathelo zokuphepha zokukhetha isidlulisi somfutho

• Ukukhethwa kwenani lomfutho we-Transmitter:

Okokuqala thola inani eliphezulu lengcindezi elinganisiwe ohlelweni. Ngokuvamile, udinga ukukhetha isidlulisi esinebanga lokucindezela elicishe libe likhudlwana ngokuphindwe ka-1.5 kunenani eliphakeme, noma uvumele ububanzi bengcindezi buwele kusidlulisi somfutho. I-1/3~2/3 yobubanzi obujwayelekile nayo iyindlela evamile.

• Hlobo luni lwe-pressure medium:

Uketshezi olubonakalayo nodaka kuzovimba izimbobo zokucindezela. Ingabe izincibilikisi noma izinto ezonakalisayo ziyocekela phansi izinto ezikumshini wokuhambisa izinto ezixhumene ngqo nale midiya.
Impahla yesidluliseli somfutho ojwayelekile esithinta okuphakathi yinsimbi engagqwali engu-316. Uma i-medium ingagqwali ku-316 insimbi engagqwali, ngakho-ke ngokuyisisekelo zonke izidluliseli zokucindezela zifanele ukukala ukucindezela kwendawo;
Uma okuphakathi konakala ku-316 insimbi engagqwali, kufanele kusetshenziswe uphawu lwamakhemikhali, futhi kusetshenziswe isilinganiso esingaqondile. Uma ithubhu le-capillary eligcwele uwoyela we-silicone lisetshenziselwa ukuqondisa ingcindezi, lingavimbela isidlulisi sokucindezela ekugqwaleni futhi lelule impilo yesidlulisi somfutho.

• Kungakanani ukunemba okudingwa yi-transmitter:

Ukunemba kunqunywa yilokhu: okungeyona i-linearity, i-hysteresis, ukungaphindi, izinga lokushisa, isikali se-zero offset, kanye nezinga lokushisa. Uma kuphakeme ukunemba, intengo iyanda. Ngokuvamile, ukunemba kwe-silicon pressure transmitter esabalele ingu-0.5 noma 0.25, futhi i-capacitive noma i-monocrystalline silicon pressure transmitter inokunemba kwe-0.1 noma i-0.075.

• Ukuxhumana kwenqubo yesithumeli:

Ngokuvamile, ama-pressure transmitter afakwa emapayipini noma emathangeni. Yiqiniso, ingxenye encane yazo ifakiwe futhi isetshenziswe ngamamitha okugeleza. Ngokuvamile kunezinhlobo ezintathu zokufaka zokudlulisa ingcindezi: intambo, i-flange, ne-clamp. Ngakho-ke, ngaphambi kokukhetha i-transmitter yokucindezela, uxhumano lwenqubo kufanele lucatshangelwe. Uma i-threaded, kuyadingeka ukunquma ukucaciswa kwentambo. Ngama-flanges, kuyadingeka ukucabangela ukucaciswa kwe-flange kobubanzi obujwayelekile.

Isingeniso semboni ye-pressure transmitter

Cishe amazwe angu-40 emhlabeni wonke abambe iqhaza ocwaningweni nasekukhiqizeni izinzwa, i-United States, Japan, neJalimane okuyizifunda ezinezinzwa ezinkulu kakhulu. La mazwe amathathu ehlangene enza ngaphezu kwama-50% emakethe yezinzwa zomhlaba.

Kulezi zinsuku, imakethe yokudlulisa umfutho ezweni lami iyimakethe ekhulile enemakethe ephezulu. Kodwa-ke, isikhundla esiphezulu ngamazwe angaphandle amelwe u-Emerson, Yokogawa, Siemens, njll. Imikhiqizo yegama lomkhiqizo ithatha cishe u-70% wesabelo semakethe futhi inenzuzo ephelele kumaphrojekthi wobunjiniyela amakhulu naphakathi.

Lokhu kungenxa yokulandelana kwesu lezwe lami lokwamukela kusenesikhathi isu elithi “market for technology”, elathinta kakhulu amabhizinisi kahulumeni wezwe lami futhi lake laba sesimweni sokwehluleka, kodwa ngesikhathi esifanayo, abanye abakhiqizi, ababemelelwe amabhizinisi azimele aseShayina, buthule Bavela futhi baqina. Imakethe yesikhathi esizayo yaseChina yokudlulisa ingcindezi igcwele izinto ezintsha ezingaziwa.