Calibrating pH Meters siv Buffer Solutions
Kho lub pH meter nrog ib qho kev daws teeb meem kom txog rau thaum qhov ntsuas tau nyeem cov pH qhov tseeb ntawm cov tshuaj. Kev hloov kho tuaj yeem ua tau raws li hauv qab no.
(1) Npaj ob lub 200mL huv beakers, dej distilled rau tu lub sensor, pH=4 thiab pH=7 tsis daws teeb meem, thiab ib tug pas ntsuas kub rau ntsuas qhov kub ntawm cov tshuaj buffer.
(2) Ncuav 50 ~ 100mL ntawm pH =4 thiab pH =7 buffer tov rau hauv beakers feem.
(3) Tshem tawm lub sensor ntawm lub bracket. Yog hais tias lub sensor yog ntsia rau hauv lub immersion khib, tshem tawm lub sensor tuav ua ke nrog kev tiv thaiv los ntawm immersion khib.
(4) Ntxuav lub sensor electrodes, so tawm cov dej tee nrog cov paj rwb absorbent, thiab raus cov electrodes nyob rau hauv lub buffer tov nrog pH =7.
(5) Tus nqi pH ntawm cov tshuaj tsis hloov pauv nrog qhov ntsuas kub, ntsuas qhov ntsuas kub ntawm cov tshuaj tsis haum nrog pH =7, thiab tom qab ntawd sib piv cov ntsuas ntsuas.
(6) Tig STD (calibration function key) clockwise los yog counterclockwise kom txog rau thaum pH transmitter qhia tus nqi tib yam li tus nqi ntsuas nyob rau hauv kauj ruam (5).
(7) Ntxuav tawm pH =7 cov tshuaj ntawm cov electrode kom tiav, thiab muab cov electrode rau hauv cov tshuaj tsis muaj pH =4.
(8) Ntsuas qhov kub ntawm pH =4 tov, thiab sib piv cov nqi ntsuas.
(9) Kho SLOPE (electrode teb nqes hav) kom txog rau thaum pH transmitter qhia tus nqi tib yam li tus nqi ntsuas hauv qib (5).
(10) Rov ua cov kauj ruam (4) ~ (6) kom txog thaum pH transmitter qhia tus nqi raug. Yog tias qhov pH raug nyeem, qhov kev ntsuas tsis tau tiav.
