Calibrating pH Meter Siv Ib-Point thiab Ob-Point Calibration
Txhua tus pH ntsuas yuav tsum tau ntsuas nrog cov qauv pH ua ntej nws tuaj yeem ntsuas pH tus nqi ntawm tus qauv. Rau cov qauv nrog kev ntsuas qhov tseeb hauv qab no {{0}}.1 pH, qhov ntsuas tuaj yeem hloov kho siv txoj kev ntsuas ib qho. Feem ntau, pH 4.01 lossis pH 7.00 tus qauv yog siv. Tsis pub. Qee cov twj paj nruag muaj qhov tseeb ntawm 0.2pH lossis 0.1pH, yog li lub ntsuas tsuas muaj "qhov chaw" hloov pob qhov rooj. Cov kauj ruam tshwj xeeb yog raws li nram no:
(1) Ntsuas qhov ntsuas kub ntawm cov txheej txheem kev daws teeb meem, saib lub rooj los txiav txim siab tus nqi pH ntawm qhov ntsuas kub no, thiab kho qhov kub ntawm qhov kub thiab txias rau qhov kub no.
(2) Yaug cov electrode nrog dej ntshiab thiab tig kom qhuav.
(3) Muab cov electrode tso rau hauv cov tshuaj tsis haum thiab co nws, tom qab ntawd muab tso rau hauv. Tom qab kev nyeem ntawv ruaj khov, kho qhov chaw qhov rooj kom lub ntsuas ntsuas pH tus nqi ntawm cov qauv kev daws teeb meem.
(4) Tshem tawm cov electrode, yaug thiab tig kom qhuav.
(5) Ntsuas tus qauv ntsuas kub thiab kho cov pH ntsuas kub ntsuas qhov ntsuas kub rau qhov ntsuas kub.
(6) Muab cov electrode tso rau hauv cov qauv kev daws teeb meem, co nws thiab muab nws tso rau hauv, thiab qhov kev nyeem ntawv tom qab kev ruaj ntseg tau tshwm sim.
Dab tsi yog ob-point calibration ntawm pH meter?
Rau precision-qib pH meters, nyob rau hauv tas li ntawd mus rau "txoj hauj lwm" thiab "kub them" kev hloov kho, kuj muaj ib tug electrode "slope" hloov, uas yuav tsum tau ob tug qauv buffers rau calibration. Feem ntau, pH4.01 lossis pH7. alkaline) cov kev daws teeb meem tsis yog xaiv rau "txoj kab nqes" Kho. Cov kauj ruam tshwj xeeb yog:
(1) Ntxuav cov electrode thiab tig nws qhuav, ces muab tso rau hauv pH4.01 los yog pH7. Tom qab tus nqi qhia tau ruaj khov, kho qhov chaw qhov rooj kom qhov ntsuas qhov ntsuas tus nqi yog pH tus nqi ntawm cov qauv kev daws teeb meem.
(2) Tshem tawm cov electrode, ntxuav nws, tig nws qhuav, thiab muab tso rau hauv thawj txheej txheem daws teeb meem. Tom qab qhov taw qhia tus nqi ruaj khov, kho cov pob qhov rooj ntawm qhov ntsuas kom qhov ntsuas qhov ntsuas tus nqi yog pH tus nqi ntawm thawj tus qauv kev daws teeb meem.
(3) Tshem tawm cov electrode, ntxuav nws thiab tig nws kom qhuav, thiab tom qab ntawd muab tso rau hauv pH4.01 lossis pH7.00 tsis muaj tshuaj. Yog tias qhov kev ua yuam kev dhau 0.02pH, rov ua cov kauj ruam (1) thiab (2) kom txog thaum tus nqi pHs raug tso tawm hauv ob qho kev daws teeb meem yam tsis tau kho cov pob qhov rooj.
(4) Tshem tawm cov electrode thiab tig nws qhuav, kho pH kub them pob qhov rooj rau qhov ntsuas kub ntawm cov qauv tshuaj, raus cov electrode hauv cov qauv tshuaj, co nws thiab tso nws tseem, thiab kev nyeem ntawv yuav ruaj khov.
