17
Water Action Volunteers – Level 2 Manual
Updated January 2016
Cal. procedure - pH 5 meter with original software and original outside casing
This calibration process will be completed by conducting two one-point calibrations. This means
that the meter will complete a single point calibration and then exit calibration mode each
time. You will have to restart the calibration process when using the pH 10 buffer solution by
pressing the CAL button.
1. Connect pH and temperature probes to meter.
a. Ensure that the pH probe connecter snaps into place.
2. Turn the meter on by pushing the On/Off button on the face of the meter.
3. Record the
date
,
time
, and the
name of analyst
performing the calibration on the calibration log.
4. Remove the pH electrode from the electrode soaker
bottle.
5. Rinse the pH electrode with distilled water and shake the excess water off of the
electrode.
6. Click the MODE button to find the
temperature
reading and
record value
on the calibration log.
7. Click the MODE button again to return to the pH screen on the meter.
8. Press the CAL button on the meter in order to start the calibration process (blinking).
9. Place the electrode and temperature sensors into the pH buffer solution
and submerge
the glass bulb completely in the solution.
10. Wait for the reading to stabilize and record the
Stabilized pH
value
on the calibration log.
11. Press the ENTER key once and record the
Calibrated
pH
value
(the meter is now out the calibration
mode and in measuring mode).
12. Check that the
Calibrated pH
value is within 0.2 of the pH buffer standard (7 or 10).
a. If the value is more than 0.2 higher or lower than its pH buffer value (compare
values in the grey columns, outlined in blue
), recalibrate the meter (new line).
b. Record the new results on the next line of the pH meter calibration log.
13. Remove the electrode from the buffer solution (refill if necessary), rinse with distilled
water and shake off the excess water from the electrode.
14. To finish the calibration, repeat steps 6 through 12 for the pH 10 buffer solution.
15. Replace the pH probe in the electrode soaker bottle (refill if necessary), turn the meter
off, and head out to the field to complete your monitoring activities.
