Yuav ua li cas paub txog lub hauv paus ntsiab lus twg yuav tsum paub thaum siv lub ntsuas ntsuas hluav taws xob?Ua ntej, kom tsis txhob electrode polarization, lub 'meter' generates ib tug ruaj khov sine yoj teeb liab thiab siv rau lub electrode.Tam sim no ntws los ntawm cov electrode yog proportional rau cov conductivity ntawm cov ntsuas ntsuas.Tom qab lub 'meter' converts cov tam sim no los ntawm ib tug high-impedance ua hauj lwm amplifier mus rau hauv ib tug voltage teeb liab, Tom qab cov kev pab cuam-tswj teeb liab amplification, theem-sensitive nrhiav thiab filtering, lub peev xwm teeb liab reflecting lub conductivity yog tau;lub microprocessor hloov los ntawm kev hloov mus ua piv txwv qhov ntsuas kub thiab cov teeb liab conductivity.Tom qab kev xam thiab ntsuas kub, cov tshuaj ntsuas tau txais ntawm 25 ° C.Tus nqi conductivity ntawm lub sijhawm thiab tus nqi kub ntawm lub sijhawm.
Lub teb hluav taws xob uas ua rau cov ions txav mus rau hauv cov kev ntsuas ntsuas yog tsim los ntawm ob lub electrodes uas nyob rau hauv kev sib cuag ncaj qha nrog cov tshuaj.Ob lub ntsuas electrodes yuav tsum tau ua los ntawm cov khoom siv tshuaj resistant.Hauv kev xyaum, cov ntaub ntawv xws li titanium feem ntau siv.Qhov ntsuas electrode muaj ob lub electrodes hu ua Kohlrausch electrode.
Kev ntsuas ntawm conductivity yuav tsum qhia meej ob yam.Ib qho yog qhov conductivity ntawm kev daws, thiab lwm qhov yog geometric kev sib raug zoo ntawm 1 / A hauv kev daws.Cov conductivity tuaj yeem tau txais los ntawm kev ntsuas tam sim no thiab voltage.Lub hauv paus ntsiab lus ntsuas no yog siv rau niaj hnub no cov khoom ntsuas ntsuas ncaj qha.
Thiab K = L / A
A - Cov phaj zoo ntawm qhov ntsuas electrode
L — Qhov kev ncua deb ntawm ob daim hlau
Tus nqi ntawm qhov no yog hu ua cell tas li.Nyob rau hauv lub xub ntiag ntawm ib tug niaj hnub hluav taws xob teb ntawm lub electrodes, lub electrode tas li yuav xam tau los ntawm geometric qhov ntev.Thaum ob daim hlau square nrog thaj tsam ntawm 1cm2 raug cais los ntawm 1cm los tsim cov electrode, qhov tas li ntawm cov electrode yog K = 1cm-1.Yog hais tias tus nqi conductivity G = 1000μS ntsuas nrog ob peb electrodes, ces cov conductivity ntawm cov tshuaj ntsuam xyuas K = 1000μS / cm.
Nyob rau hauv ib txwm muaj xwm txheej, cov electrode feem ntau tsim ib feem ntawm cov hluav taws xob tsis sib xws.Lub sijhawm no, lub cell tas li yuav tsum tau txiav txim siab nrog kev daws teeb meem.Cov kev daws teeb meem feem ntau siv KCl tov.Qhov no yog vim qhov conductivity ntawm KCl yog qhov ruaj khov thiab raug nyob rau hauv qhov sib txawv ntawm qhov kub thiab txias.Cov conductivity ntawm 0.1mol / l KCl tov ntawm 25 ° C yog 12.88mS / CM.
Lub thiaj li hu ua non-uniform electric teb (tseem hu ua stray field, to to) tsis tas li, tab sis muaj feem xyuam rau hom thiab concentration ntawm ions.Yog li ntawd, ib tug ntshiab stray teb electrode yog qhov phem tshaj electrode, thiab nws tsis tuaj yeem ua tau raws li qhov kev xav tau ntawm kev ntsuas dav los ntawm ib qho kev ntsuas.
2. Dab tsi yog daim ntawv thov teb ntawm lub ntsuas ntsuas hluav taws xob?
Cov teb uas siv tau: Nws tuaj yeem siv dav hauv kev soj ntsuam tas li ntawm cov txiaj ntsig conductivity hauv kev daws teeb meem xws li thermal zog, tshuaj chiv, metallurgy, kev tiv thaiv ib puag ncig, tshuaj, biochemicals, zaub mov thiab dej kais dej.
3.Dab tsi yog lub cell tas li ntawm lub ntsuas ntsuas hluav taws xob?
"Raws li cov qauv K = S / G, lub cell tas li K tuaj yeem tau txais los ntawm kev ntsuas qhov conductance G ntawm conductivity electrode nyob rau hauv ib co concentration ntawm KCL tov.Lub sijhawm no, qhov conductivity S ntawm KCL tov yog paub.
Lub electrode tsis tu ncua ntawm lub conductivity sensor yog piav qhia txog geometric zog ntawm ob lub electrodes ntawm lub sensor.Nws yog qhov sib piv ntawm qhov ntev ntawm cov qauv hauv qhov chaw tseem ceeb ntawm 2 electrodes.Nws ncaj qha cuam tshuam qhov rhiab heev thiab qhov tseeb ntawm qhov ntsuas.Kev ntsuas ntawm cov qauv uas tsis tshua muaj conductivity yuav tsum tsis muaj cell tsis tu ncua.Kev ntsuas cov qauv nrog cov conductivity siab yuav tsum muaj cov cell tsis tu ncua.Lub ntsuas ntsuas yuav tsum paub lub cell tas li ntawm kev sib txuas conductivity sensor thiab kho cov kev nyeem ntawv kom haum.
4. Dab tsi yog cov cell tsis tu ncua ntawm cov ntsuas ntsuas hluav taws xob?
Ob-electrode conductivity electrode yog tam sim no siv ntau hom conductivity electrode nyob rau hauv Suav teb.Cov qauv ntawm kev sim ob-electrode conductivity electrode yog sinter ob daim ntawv platinum ntawm ob daim iav sib luag los yog cov phab ntsa sab hauv ntawm ib puag ncig iav raj los kho cov platinum daim ntawv Cheeb Tsam thiab kev ncua deb tuaj yeem ua rau cov khoom siv hluav taws xob nrog cov nqi sib txawv.Feem ntau muaj K = 1, K = 5, K = 10 thiab lwm yam.
Lub hauv paus ntsiab lus ntawm conductivity meter yog ib qho tseem ceeb heev.Thaum xaiv cov khoom, koj yuav tsum xaiv cov chaw tsim khoom zoo.
Post lub sij hawm: Dec-15-2021