intloko_ibhena

Ukwaziswa kwemitha yokuqhuba

Luluphi ulwazi olusisiseko olufanele luphathwe ngexesha lokusetyenziswa kwemitha yokuqhuba? Okokuqala, ukuze ugweme i-electrode polarization, imitha ivelisa isignali ye-sine ezinzileyo kwaye iyisebenzise kwi-electrode. Ikhoyo ngoku ehamba nge-electrode ihambelana nokuhamba kwesisombululo esilinganisiweyo. Emva kokuba imitha iguqule i-current kwi-high-impedance amplifier yokusebenza kwisignali ye-voltage, Emva kokulungiswa kwesignali elawulwa yiprogram, ukubonwa kwesigaba-sensitive kunye nokucoca, umqondiso onokuthi ubonise ukuhanjiswa kufunyenwe; i-microprocessor itshintsha ngokutshintshela ukutshintshela isampuli yesignali yeqondo lokushisa kunye nesignali ye-conductivity. Emva kokubala kunye nembuyekezo yeqondo lokushisa, isisombululo esilinganisiweyo sifumaneka kwi-25 ° C. Ixabiso le-conductivity ngexesha kunye nexabiso lobushushu ngelo xesha.

Intsimi yombane eyenza ukuba i-ion ihambe kwisisombululo esilinganisiweyo iveliswa ngama-electrode amabini adibana ngqo nesisombululo. Izibini zokulinganisa i-electrode kufuneka zenziwe ngezinto ezixhathisa iikhemikhali. Enyanisweni, izixhobo ezifana ne-titanium zihlala zisetyenziswa. I-electrode yokulinganisa eyenziwe ngee-electrode ezimbini ibizwa ngokuba yiKohlrausch electrode.

Umlinganiselo wokuqhuba kufuneka ucacise iinkalo ezimbini. Enye yi-conductivity yesisombululo, kwaye enye intsebenziswano yejometri ye-1 / A kwisisombululo. I-conductivity inokufumaneka ngokulinganisa okwangoku kunye ne-voltage. Lo mgaqo wokulinganisa usetyenziswa kwizixhobo zanamhlanje zokulinganisa ngokuthe ngqo.

Kwaye K=L/A

A——Ipleyiti esebenzayo ye-electrode yokulinganisa
L——Umgama phakathi kwamacwecwe amabini

Ixabiso loku kubizwa ngokuba yiseli engaguqukiyo. Ngobukho bentsimi yombane efanayo phakathi kwe-electrode, i-electrode rhoqo ingabalwa ngemilinganiselo yejometri. Xa iipleyiti ezimbini zesikwere ezinommandla we-1cm2 zihlulwe nge-1cm ukwenza i-electrode, isigxina sale electrode yi-K = 1cm-1. Ukuba ixabiso le-conductivity G = 1000μS lilinganiswe nale sibini se-electrode, ngoko ukuqhuba kwesisombululo esivavanyiweyo K = 1000μS / cm.

Ngaphantsi kweemeko eziqhelekileyo, i-electrode idla ngokwenza i-partial non-uniform electric field. Ngeli xesha, i-cell constant kufuneka igqitywe ngesisombululo esiqhelekileyo. Izisombululo eziqhelekileyo zisebenzisa isisombululo se-KCl. Oku kungenxa yokuba i-conductivity ye-KCl izinzile kwaye ichanekile phantsi kobushushu obuhlukeneyo kunye noxinzelelo. I-conductivity ye-0.1mol / l isisombululo se-KCl kwi-25 ° C yi-12.88mS / CM.

Into ebizwa ngokuba yi-non-uniform electric field (ekwabizwa ngokuba yintsimi elahlekileyo, intsimi yokuvuza) ayinayo rhoqo, kodwa ihambelana nohlobo kunye nokugxininiswa kwee-ion. Ngoko ke, i-electrode ecocekileyo yentsimi yi-electrode embi kakhulu, kwaye ayikwazi ukuhlangabezana neemfuno zoluhlu olubanzi lokulinganisa ngokulinganisa omnye.

  
2. Ithini intsimi yesicelo semitha ye-conductivity?

Imimandla esebenzayo: Ingasetyenziswa ngokubanzi ekubekeni iliso rhoqo kumaxabiso e-conductivity kwizisombululo ezifana namandla ashushu, izichumisi zekhemikhali, i-metallurgy, ukhuseleko lokusingqongileyo, amayeza, iikhemikhali zebhayoloji, ukutya kunye namanzi etephu.

3.Yintoni iseli engaguqukiyo yemitha yokuqhuba?

"Ngokutsho kwefomula K = S / G, i-cell constant K inokufumaneka ngokulinganisa i-conductance G ye-electrode conductivity kwi-concentration ethile yesisombululo se-KCL. Ngeli xesha, i-conductivity S yesisombululo se-KCL iyaziwa.

I-electrode rhoqo ye-conductivity sensor ichaza ngokuchanekileyo iimpawu zejometri ze-electrodes ezimbini zenzwa. Ingumlinganiselo wobude besampulu kwindawo ebalulekileyo phakathi kwee-electrodes ezi-2. Ichaphazela ngokuthe ngqo uvakalelo kunye nokuchaneka komlinganiselo. Umlinganiselo weesampulu ezine-conductivity ephantsi zifuna i-cell constants ephantsi. Umlinganiselo weesampulu ezine-conductivity ephezulu zifuna ukuguquguquka kweeseli eziphezulu. Isixhobo sokulinganisa kufuneka sazi i-cell constant ye-conductivity sensor edibeneyo kwaye ulungelelanise iinkcukacha zokufunda ngokufanelekileyo.

4. Ziziphi iiseli ezingaguqukiyo zemitha yokuqhuba?

I-electrode conductivity electrode ene-electrode esetyenziswa ngoku yolona hlobo lusetyenziswa kakhulu lwe-electrode conductivity e-China. Ubume bomfuniselo we-electrode conductivity electrode kukwenza amacwecwe amabini eplatinam kumaphepha amabini eglasi ahambelanayo okanye udonga lwangaphakathi lwetyhubhu yeglasi engqukuva ukulungelelanisa iphepha leplatinam Indawo kunye nomgama ungenziwa kwi-electrode conductivity kunye namaxabiso ahlukeneyo ahlukeneyo. Ngesiqhelo kukho K=1, K=5, K=10 kunye nezinye iindidi.

Umgaqo wemitha ye-conductivity ubaluleke kakhulu. Xa ukhetha imveliso, kufuneka ukhethe umenzi olungileyo.


Ixesha lokuposa: Dec-15-2021