Iluphi ulwazi lwesimiso okufanele lufundwe kahle ngesikhathi kusetshenziswa imitha ye-conductivity? Okokuqala, ukuze kugwenywe i-electrode polarization, imitha ikhiqiza isignali ye-sine wave ezinzile futhi iyisebenzise 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 iyatholakala; i-microprocessor ishintsha ngokusebenzisa iswishi ukuze isampulale isignali yezinga lokushisa kanye nesiginali ye-conductivity. Ngemuva kokubala kanye nesinxephezelo sokushisa, isisombululo esilinganisiwe sitholakala ku-25 ° C. Inani le-conductivity ngaleso sikhathi kanye nenani lokushisa ngaleso sikhathi.
Inkambu kagesi eyenza ama-ion ahambe esixazululweni esilinganisiwe akhiqizwa ama-electrode amabili axhumene ngqo nesisombululo. 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 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.
Okubizwa ngokuthi inkambu kagesi engalingani (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 ompompi.
3.Iyini i-cell constant ye-conductivity meter?
“Ngokwefomula ethi K=S/G, iseli engu-K engaguquki ingatholwa ngokulinganisa ukuqhutshwa kuka-G kwe-electrode conductivity ekuhlanganiseni okuthile kwesisombululo se-KCL. Ngalesi sikhathi, i-conductivity S yesixazululo se-KCL yaziwa.
I-electrode constant of the conductivity sensor ichaza ngokunembile izakhiwo zejometri zama-electrode amabili wenzwa. Kuyisilinganiso sobude besampula endaweni ebalulekile phakathi kwama-electrode angu-2. Kuthinta ngokuqondile ukuzwela nokunemba kwesilinganiso. Ukukalwa kwamasampuli ane-conductivity ephansi kudinga ama-cell constants aphansi. 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 emashidini amabili engilazi afanayo noma odongeni lwangaphakathi lweshubhu lengilazi eliyindingilizi 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 umkhiqizi omuhle.
Isikhathi sokuthumela: Dec-15-2021