3.01. Calibrating the pH Meter

  1. Turn on pH meter.
  2. Remove the electrode cap by gently unscrewing the white neck of the cap.
  3. Place the cap on the table so that it is not in the way.
  4. Place the pH rinse beaker under the pH probe.
  5. Thoroughly rinse the entire black section of the probe with dH2O.
  6. Dry the probe gently with a paper towel. Be sure to gently dab the tip of the probe.
  7. Position the black stand beneath the probe of the pH meter.
  8. Place the pH 1 standard on the stage.
  9. Press the calibrate button.
  10. Lower the arm of the pH meter so that the probe is completely submerged in the buffer solution. Your setup should look like Figure 2a at this point.
  11. Wait until the pH meter is done calibrating. This is indicated by a radical symbol on the M on the top right of the pH meter screen. See Figure 2b.
  12. Click the read button.
  13. Raise the arm so the probe is no longer in the buffer solution.
  14. Repeat steps 4-12 with the other buffer solutions.

Tip

It may be helpful to view the following video for additional instruction (see below): https://www.youtube.com/watch?v=7yuXjGdQRzM

(a)

(b)
Figure 2. (a) pH meter during calibration. (b) pH meter screen when it is ready to read (notice the M in the top right).