Laboratory pH meter los ntsuas pH ntawm kev daws? Yuav ua li cas calibrate pH meter?
1. Lub hauv paus ntsiab lus ua haujlwm Leici PHS-3E pH meter yog tsim los ntawm lub thawv loj, cov keyboard, loj-screen LCD kua siv lead ua zaub, ntau lub luag haujlwm electrode tuav, E-301 pH compound electrode thiab fais fab hloov. Nws ntsuas pH siv txoj kev potentiometric. Txoj kev potentiometric siv cov lus teb ntawm cov iav electrode rau qhov kev hloov pauv ntawm cov concentration ntawm hydrogen ions hauv cov tshuaj aqueous. Nws yog ua ke nrog cov ntaub ntawv siv electrode hauv kev daws teeb meem los tsim "tshuaj roj teeb", thiab pH tus nqi ntawm cov tshuaj yog txiav txim los ntawm kev ntsuas qhov kev hloov ntawm nws cov electromotive quab yuam.
2. Ib puag ncig ua haujlwm
Lub ambient kub yuav tsum tau siv rau ib txwm siv thiab cia ntawm pH meter yog 5 ~ 40 degree, thiab cov txheeb ze av noo tsis tshaj 85 feem pua. Nws xav tau lub zog ruaj khov, tsis muaj lwm yam sib nqus cuam tshuam tsuas yog lub ntiaj teb sib nqus, thiab tsis muaj kev vibration thiab corrosive gases nyob ib ncig ntawm.
Qhov chaw ua haujlwm ntawm qhov ntsuas yuav tsum tau ua kom huv si, thiab cov cuab yeej sim yuav tsum tau muab tso rau kom zoo. Laboratory countertops yuav tsum tau qhuav thiab huv si los tiv thaiv cov qauv dej los ntawm kev ua qias tuaj. Kev haus luam yeeb yog txwv tsis pub nyob hauv chav kuaj, zaub mov lossis lwm yam khoom tsis cuam tshuam tsis tuaj yeem nqa mus rau hauv chav kuaj, thiab kev nyab xeeb hluav taws yuav tsum tau saib xyuas.
Cov neeg saib xyuas dej nag yuav tsum muaj tus cwj pwm ua haujlwm hnyav, kev ua haujlwm zoo, thiab kev sim ua kom huv thiab huv. Cov neeg soj ntsuam hnav khaub ncaws ua haujlwm tshwj xeeb thaum nkag mus rau hauv chav kuaj, thiab ntxuav tes ua ntej thiab tom qab ua haujlwm. Ua tib zoo saib xyuas koj tus kheej kev nyab xeeb thaum lub sijhawm ua haujlwm, thiab tsis txhob txaws cov tshuaj reagent rau ntawm lub cev, khoom siv thiab chaw ua haujlwm. Ua ntej siv, xyuas kom meej tias cov cuab yeej raug teeb tsa kom raug, lub hauv paus yog qhov zoo, kev sib txuas ntawm lub hwj huam mov thiab cov khoom siv hluav taws xob yuav tsum ruaj khov thiab txhim khu kev qha, thiab ceev faj kom tsis txhob muaj kuab paug los ntawm corrosive gases. Tom qab kev ua haujlwm tiav lawm, nws yuav tsum tau txiav lub hwj huam mov hauv lub sijhawm thiab ntxig lub voj voog luv luv rau hauv lub qhov (socket) kom tsis txhob muaj plua plav thiab dej vapor nkag mus; thaum lub ntsuas ntsuas tsis siv sijhawm ntev, nws yuav tsum tau npog nrog cov ntaub huv huv lossis ib daim ntaub tshwj xeeb kom tsis txhob muaj plua plav nkag mus rau hauv qhov ntsuas.
3. Kev ceev faj thaum ntsuas Ua ntej pib cov khoom siv, xyuas seb lub hwj huam mov puas txuas ruaj khov, thiab ua tib zoo xyuas seb puas muaj cov kua tiv thaiv txaus hauv cov khoom siv hluav taws xob thiab cov electrode tiv thaiv cap. Thaum ntsuas, nws yuav tsum tau ua raws li cov kev cai thiab cov kauj ruam ntsuas tau teev tseg los ntawm qhov chaw nres tsheb, thiab kev ntsuas ntsuas yuav tsum yog lub teeb thiab ruaj khov. Cov hlau lead ntawm electrode yuav tsum tau khaws cia, txwv tsis pub nws yuav ua rau qhov ntsuas tsis ruaj khov. Tom qab preheating, lub electrode yuav tsum tau calibrated ua ntej txhua yam siv lub ntsuas. Leici PHS-3E pH meter muaj lub peev xwm los txheeb xyuas cov qauv kev daws teeb meem, thiab tuaj yeem txheeb xyuas sai thiab txiav txim siab 4.00pH, 6.86pH, thiab 9.18pH cov qauv kev daws teeb meem . " qhov tseem ceeb, koj tuaj yeem nias lub pob "OK" ncaj qha los ua kom tiav cov calibration yam tsis tau kho cov ntaub ntawv.
Muaj ob txoj kev calibration: ib-point calibration thiab ob-point calibration. Cov kab lus siv ob-point calibration method. Thaum calibrating, qhov kev txiav txim ntawm "qhov chaw ua ntej, ces txoj kab nqes" yuav tsum ua raws. Feem ntau, cov kua nruab nrab nruab nrab yog siv rau qhov chaw, tab sis txoj kab nqes ntawm cov qauv kua yuav tsum raug xaiv raws li qhov ntau ntawm cov nag lossis daus pH nqi ntawm txhua qhov chaw nres tsheb ntau xyoo, thiab cov txheej txheem kua ze ntawm qhov ntau yuav tsum tau xaiv rau txoj kab nqes. calibration. Qee lub sij hawm pH nyeem ntawv tsis ruaj khov, ntxiv rau qhov ntsuas nws tus kheej, nws yuav tshwm sim los ntawm txoj kev ntsuas tsis raug. Lub sijhawm no, cov txheej txheem ntawm ob-point calibration tuaj yeem raug txais yuav rov ua dua los ua kom cov cuab yeej ncav cuag lub xeev zoo tshaj plaws.
Kev ntsuas qhov tseeb ntawm pH meter yuav drift nrog lub sijhawm thiab cov sijhawm siv. Lub chaw nres tsheb yuav tsum tsis tu ncua mus rau lub tuam tsev nrog rau cov ntaub ntawv pov thawj tsim nyog rau kev txheeb xyuas txhua txhua xyoo kom ntseeg tau tias cov cuab yeej ua haujlwm li qub.
4. Kev siv thiab kev saib xyuas ntawm cov khoom siv electrode Cov khoom siv hluav taws xob sib xyaw yog ib qho tseem ceeb ntawm cov qauv ntawm pH meter. Txawm hais tias nws zoo li qub lossis tsis yog ncaj qha ntsig txog qhov tseeb ntawm cov ntaub ntawv ntsuas. Thaum lub sijhawm ua haujlwm txhua hnub thiab kev saib xyuas, koj yuav tsum tau ua tib zoo mloog cov hauv qab no.
Ua ntej tshaj plaws, cov khoom siv hluav taws xob sib xyaw yuav tsum muab pov tseg hauv lub sijhawm thaum nws tawm hauv lub Hoobkas rau 2a lossis nce mus txog 1a tom qab siv. Thib ob, ua ntej siv cov khoom siv hluav taws xob sib xyaw, cov iav qhov muag pom ntawm cov electrode yuav tsum tau kuaj xyuas. Raws li ib txwm muaj, lub electrode yuav tsum pob tshab tsis muaj kab nrib pleb; lub sphere yuav tsum tau ntim nrog cov tshuaj uas tsis muaj cua npuas, txwv tsis pub nws yuav cuam tshuam rau qhov ntsuas qhov tseeb, yog tias muaj cov pa npuas, cov npuas hauv cov cua yuav tsum raug tshem tawm zoo li lub ntsuas kub. Txij li thaum lub khob iav yog nyias nyias, txhua qhov tawg yuav ua rau cov electrode tsis muaj txiaj ntsig. Thaum nws tau lees paub tias txhua yam zoo li qub, tshem tawm cov electrode tiv thaiv npog, thiab zam lub teeb pom kev zoo electrode iav los ntawm kev sib cuag nrog cov khoom tawv thaum lub sijhawm ua haujlwm, thiab tsis txhob muab tso rau hauv cov dej distilled mus ntev, cov kua protein thiab kua qaub fluoride.
Thaum siv, cov roj hmab stopper nyob rau sab saum toj ntawm cov khoom siv electrode yuav tsum raug tshem tawm; Qhov siab ntawm cov kua filling hauv cov electrode feem ntau yog nyob ntawm 2/3, yog tias cov kua filling tsawg dhau lawm, yuav tsum tau ntxiv cov tshuaj ntxiv rau cov tshuaj saturated potassium chloride. Tom qab ntxuav cov electrode, tsis txhob so lub iav daim nyias nyias nrog cov ntawv lim, thiab siv cov ntawv lim kom nqus dej kom tsis txhob muaj kev sib kis thiab kev puas tsuaj rau cov iav membrane. Tsis tas li ntawd, qhov kawg ntawm cov hluav taws xob sib xyaw yuav tsum tau ua kom huv si thiab qhuav kom tsis txhob luv luv ntawm ob qhov kawg ntawm cov zis, txwv tsis pub nws yuav ua rau kev ntsuas tsis raug lossis tsis ua haujlwm.
Thaum kawg ntawm kev ntsuas, kev tiv thaiv electrode yuav tsum tau muab tso rau hauv lub sijhawm, thiab ib qho me me ntawm cov ntaub ntawv siv sab nraud yuav tsum tau muab tso rau hauv lub tes tsho electrode kom cov electrode npuas moist. Yog tias cov khoom siv hluav taws xob tsis siv tau ntev (ntau tshaj ob lub lis piam), ua ntej siv nws dua, ntsuas qhov kawg ntawm cov electrode yuav tsum tau muab tso rau hauv 3mol / L potassium chloride tov rau ntau tshaj 2 teev ua ntej siv, txwv tsis pub nws yuav ua rau muaj peev xwm drift.
