Iluphi ulwazi oluyisisekelo okufanele lufundwe ngesikhathi kusetshenziswa imitha ye-conductivity?Okokuqala, ukuze kugwenywe i-electrode polarization, imitha ikhiqiza isignali ye-sine wave ezinzile futhi iyisebenzisa ku-electrode.I-current egeleza nge-electrode ilingana ne-conductivity yesisombululo esilinganisiwe.Ngemuva kokuthi imitha iguqule i-current kusuka ku-amplifier yokusebenza kwe-impedance ephezulu ibe isignali ye-voltage, Ngemva kokukhulisa isignali elawulwa uhlelo, ukutholwa okubucayi kwesigaba nokuhlunga, isignali engase ibe khona ekhombisa ukuqhutshwa kwe-conductivity iyatholakala;i-microprocessor ishintsha ngokusebenzisa iswishi ukuze isampulale isignali yezinga lokushisa kanye nesignali ye-conductivity.Ngemuva kokubala kanye nesinxephezelo sokushisa, isisombululo esilinganisiwe sitholakala ku-25 ° C.Inani le-conductivity ngaleso sikhathi kanye nevelu yezinga lokushisa ngaleso sikhathi.
Inkambu kagesi eyenza ama-ion ahambe esixazululweni esilinganisiwe akhiqizwa ama-electrode amabili axhumene ngqo nesixazululo.Ipheya lama-electrode okulinganisa kufanele enziwe ngezinto ezimelana namakhemikhali.Ngokuvamile, izinto ezifana ne-titanium zivame ukusetshenziswa.I-electrode yokulinganisa eyakhiwe ngama-electrode amabili ibizwa ngokuthi i-Kohlrausch electrode.
Isilinganiso se-conductivity sidinga ukucacisa izici ezimbili.Enye i-conductivity yesisombululo, kanti enye ubuhlobo bejometri ye-1/A esixazululweni.I-conductivity ingatholwa ngokulinganisa okwamanje kanye ne-voltage.Lesi simiso sokulinganisa sisetshenziswa kumathuluzi okulinganisa okuboniswa okuqondile anamuhla.
Futhi K=L/A
A——Ipuleti elisebenzayo le-electrode yokulinganisa
L——Ibanga phakathi kwamapuleti amabili
Inani lalokhu libizwa ngokuthi i-cell constant.Lapho kukhona insimu kagesi efanayo phakathi kwama-electrode, i-electrode engaguquki ingabalwa ngezilinganiso zejometri.Lapho amapuleti amabili ayizikwele anendawo engu-1cm2 ehlukaniswa ngo-1cm ukuze akhe i-electrode, le electrode engaguquki ingu-K=1cm-1.Uma inani le-conductivity G=1000μS likalwa naleli pheya lama-electrode, khona-ke ukuqhutshwa kwesixazululo esihloliwe K=1000μS/cm.
Ngaphansi kwezimo ezijwayelekile, i-electrode ivame ukwakha insimu kagesi eyingxenye engajwayelekile.Ngalesi sikhathi, ukuqina kweseli kufanele kunqunywe ngesisombululo esijwayelekile.Izixazululo ezijwayelekile ngokuvamile zisebenzisa isixazululo se-KCl.Lokhu kungenxa yokuthi conductivity ye-KCl izinzile kakhulu futhi inembe ngaphansi kwamazinga okushisa ahlukene nokugxila.I-conductivity yesisombululo se-0.1mol/l KCl ku-25°C ngu-12.88mS/CM.
Inkundla kagesi ebizwa ngokuthi i-non-uniform (ebizwa nangokuthi inkambu elahlekile, inkambu yokuvuza) ayinakho njalo, kodwa ihlobene nohlobo nokugxila kwama-ion.Ngakho-ke, i-electrode yensimu elahlekile iyi-electrode embi kakhulu, futhi ayikwazi ukuhlangabezana nezidingo zebanga elibanzi lokulinganisa ngokulinganisa okukodwa.
2. Iyini inkambu yesicelo semitha ye-conductivity?
Izinkambu ezisebenzayo: Ingasetshenziswa kabanzi ekuqaphelweni okuqhubekayo kwamanani e-conductivity ??ezixazululweni ezifana namandla ashisayo, umanyolo wamakhemikhali, i-metallurgy, ukuvikelwa kwemvelo, imithi, amakhemikhali ezinto eziphilayo, ukudla kanye namanzi ampompi.
3.Iyini i-cell constant ye-conductivity meter?
“Ngokwefomula ethi K=S/G, iseli engu-K engaguquki ingatholwa ngokulinganisa ukuqhutshwa kwe-electrode conductivity ekuhlanganiseni okuthile kwesixazululo se-KCL.Ngalesi sikhathi, i-conductivity S yesisombululo se-KCL iyaziwa.
I-electrode constant of the conductivity sensor ichaza ngokunembile izakhiwo zejometri zama-electrode amabili wenzwa.Isilinganiso sobude besampula endaweni ebalulekile phakathi kwama-electrode angu-2.Ithinta ngokuqondile ukuzwela nokunemba kwesilinganiso.Ukulinganisa amasampula ane-conductivity ephansi kudinga ukuguquguquka kweseli okuphansi.Ukulinganisa amasampula ane-conductivity ephezulu kudinga ukuguquguquka kwamaseli aphezulu.Ithuluzi lokulinganisa kufanele lazi ukungaguquguquki kweseli yenzwa yokuqhuba exhunyiwe futhi lilungise imininingwane yokufunda ngokufanele.
4. Ayini ama-cell constants we-conductivity meter?
I-electrode conductivity electrode emibili okwamanje iwuhlobo olusetshenziswa kakhulu lwe-electrode conductivity e-China.Isakhiwo se-electrode conductivity electrode yokuhlola iwukuba sinter amashidi amabili eplatinamu kushidi lezingilazi ezimbili ezifanayo noma udonga lwangaphakathi lweshubhu lengilazi eliyindilinga ukuze kulungiswe i-platinum sheet Indawo kanye nebanga lingenziwa libe ama-electrode conductivity anamanani ahlukene angashintshi.Ngokuvamile kukhona K=1, K=5, K=10 nezinye izinhlobo.
Isimiso semitha ye-conductivity sibaluleke kakhulu.Lapho ukhetha umkhiqizo, kufanele futhi ukhethe umenzi omuhle.
Isikhathi sokuthumela: Dec-15-2021