11
3.1.2 pH Calibration Procedure Multiple Point
1. Pour a 7.0 pH bu er calibration standard solution into a clean,
dry container. Turn on the meter and select the pH mode by
pressing the
MODE
key.
2. Dip the pH probe and temperature probe into the solution. Stir
gently and wait for the reading to stabilize (approximately 30
seconds depending on the probe condition).
3. Press
CAL
to enter the pH calibration mode.
CA
will be
displayed momentarily before the display will
ß
ash the current
un-calibrated reading.
To abort or cancel the calibration without accepting the new
value, press the
CAL
key. The meter will automatically revert to
the pH measurement mode.
4. Allow the reading to stabilize. Press the
ENTER
key to con
Þ
rm
the calibration.
CO
will be displayed momentarily.
5. Pour a known pH bu er calibration standard solution, e,g, pH
4.00, into a clean, dry container.
6. Dip the pH probe and temperature probe into the solution. Stir
gently and wait for the reading to stabilize (approximately 30
seconds depending on the probe condition).
7. Allow the reading to stabilize. Press the ENTER key to con
Þ
rm
the calibration. CO will be displayed momentarily.
8. Press the CAL key to return to the measurement mode.
3.1.3 Changing the pH Buffer Group
The meter can be calibrated with pH standards of USA, NIST (nSt) or
Low Ionic (Pb) pH bu er groups. The factory default is the USA bu er
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