Calibrating pH meter siv cov kev daws teeb meem tsis
Kho cov pH meter nrog ib qho kev daws teeb meem kom txog thaum qhov ntsuas tau nyeem cov tshuaj pH kom raug. Nws tuaj yeem hloov kho raws li hauv qab no.
(1) Npaj ob 200mL huv beakers, dej distilled rau ntxuav lub sensor, pH =4 thiab pH =7 buffer solutions, 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 bracket, tshem tawm lub sensor tuav thiab tiv thaiv los ntawm lub immersion bracket.
(4) Ntxuav lub sensor electrode, so cov tee dej nrog cov paj rwb nqus dej, thiab muab cov electrode tso rau hauv ib qho kev daws teeb meem nrog pH =7.
(5) Tus nqi pH ntawm cov tshuaj tsis haum hloov nrog qhov kub thiab txias. Ntsuas qhov ntsuas kub ntawm cov tshuaj tsis haum nrog pH =7, thiab tom qab ntawd sib piv cov nqi ntsuas.
(6) Tig STD (calibration function key) clockwise los yog counterclockwise kom txog rau thaum lub pH transmitter qhia tib tus nqi raws li ntsuas nyob rau hauv kauj ruam (5).
(7) Ua kom tiav cov tshuaj pH =7 ntawm cov electrode thiab muab cov electrode tso rau hauv pH =4 buffer solution.
(8) Ntsuas qhov kub ntawm pH =4 tov, thiab tom qab ntawd 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 hais tias tus nqi pH raug nyeem kom raug, qhov kev ntsuas tsis tau tiav.
