pH Meter

pH CALIBRATION

1.Pour asmall quantity of pH6.86. pH4.00 and oH9.18 solution into clean beakers.
2.For a particularly accurate calibration, itis advised to use two beakers for each buffer solution; the first is to be used forrinsing the electrode, the second is to be used for the calibration. In this way, the risks of contaminating the buffer solution are reduced to a minimum
3.Switch on the instrument.
4.lmmerse the electrode in a pH6.86 buffer solution, and gently shake it until the reading to stabilize
5.Press the button “CAL” until the calibration Indicator is light.Then press “PH7” until the display shows “6.86”. Rinse the electrode with distilled water.
6.lmmerse the electrode in a pH 4.00 buffer solution, and gently shake it until the reading to stabilize
7.Press the button “CAL” until the calibration Indicator is light.Then press “PH4” until the display shows “4,00”. Rinse the electrode with distilled water.
8.lmmerse the electrode in a PH9.18 buffer solution. Waiting for the reading to stabilize until the display reading exact 9.18.
9.The calibration of the instrument’s pH range is now complete