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Section 5 Calibration
The procedure that follows is applicable to meters that can connect to Intellical pH probes. Refer to
the applicable meter documentation for meter operation and probe-specific settings.
5.1 Calibration notes
Read the notes that follow before calibration:
• Use prepared pH buffer solutions or mix pH buffer powder pillows with deionized water for
calibration. Discard the prepared buffer solutions after each calibration.
• Use two or three buffer solutions for best results. Two buffer solutions are sufficient if the expected
sample pH is between the pH of the two buffer solutions. The sequence in which the pH buffer
solutions are used is not important. Use buffer solutions that are 2 or more pH units apart.
• For a one-point calibration, use a pH buffer near the expected sample pH.
• Use the default calibration options or change the options in the probe settings menu.
• Use the single display mode for calibration when more than one probe is connected to the meter (if
applicable).
• Calibrate the probes and verify the calibration regularly for best results. Use the meter to set
calibration reminders.
• The calibration data is stored in the probe. When a calibrated probe is connected to a different
meter with the same calibration options, a new calibration is not necessary.
• Air bubbles below the sensor when in solution can cause a slow response or error in the
calibration. Make sure to remove air bubbles during calibration.
• The pH buffer solutions have known pH values at different temperatures. The meter uses the mV
and temperature readings of the probe in the pH buffer solutions to calculate a calibration slope.
During measurements, the meter adjusts the slope for the sample temperature to determine the
pH value of the sample.
• If the rugged probe does not easily go in the calibration container, remove the shroud. Refer to
Remove or install the shroud
5.2 Calibration procedure
1. Go to the
calibrate menu.
Select the probe, if
applicable. The
display shows the
pH buffer solutions
to use for calibration.
8 English
on page 13.
2. Prepare or pour
the pH buffer
solutions in different
beakers.
3. Rinse the probe
with deionized water.
Dry the probe with a
lint-free cloth.
4. Put the probe in
the first pH buffer
solution. Make sure
that the sensor and
reference junction
are fully in the
solution. Do not put
the probe on the
bottom or sides of
the beaker.
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