19
Water Action Volunteers – Level 2 Manual
Updated January 2016
**With the software update, the meter stays in calibration mode between buffer solutions in
order to complete the two-point calibration. This means that you will not be able to record the
temperature for the pH 10 buffer solution– either leave the space blank or scribble out the
column ( ) so that you remember that you can’t fill in this column.
15. Wait for the reading to stabilize and record the
Stabilized pH
value
on the calibration log.
16. Press the ENTER key once and record the
Calibrated pH
value
a. The pH reading on the screen will stop
blinking as the meter should have exited
calibration mode and entered measurement mode.
17. Check that the
Calibrated pH
value is within 0.2 of the pH 7 buffer standard.
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.
b. Record the new results on the next line of the pH meter calibration log.
18. (the value on the screen will stop blinking as the meter should have exited calibration
mode and entered measurement mode).
19. Remove the electrode from the pH 10 buffer solution, rinse with distilled water and
shake off the excess water from the electrode.
20. 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.
Cal. procedure - pH 5+ meter with updated software and updated outside casing
For the pH 5+ meter, the updated software version from the pH 5 is all wrapped up in a brand
new package! The updated version allows for you to complete a two-point calibration without
ever leaving the calibration mode. After you press ENTER following the first calibration, the
value on the screen will continue to blink, indicating that it is still in calibration mode (unlike the
old version that stopped blinking after you hit ENTER and went into measuring mode).
Follow the calibration procedure list above (page 19) for the
pH 5 meter with the updated
software, but original outside casing
in order to properly calibrate your pH 5+ meter. Please
contact your local coordinator or the WAV coordinator if you have any questions about how to
properly calibrate any of the meters!
