21
Procedure:
• Switch the instrument on after connecting the pH
electrode.
• Rinse and immerse the pH electrode in pH 7.01
buffer and shake briefly. Wait 1 or 2 minutes for
the reading to stabilize.
• Note the temperature of the buffer solution using
a ChecktempC or a glass thermometer (e.g.20°C).
• Press the °C key to select temperature setting. Ad-
just the Temperature °C knob until display shows
the noted temperature.
• Press the pH key to select pH measure-
ment.
• Wait 1-2 minutes and adjust the OFFSET
knob until display shows the pH value at
the noted temperature (see the pH versus
temperature chart at page 23).
• Rinse and immerse the pH electrode in
pH 4.01/pH 10.01 buffer and shake
briefly.
• Wait 1-2 minutes and adjust the SLOPE
knob until display shows the pH value at
the noted temperature (see the pH versus
temperature chart at page 23).
• The pH calibration is now complete.
PH CALIBRATION FOR HI8520 AND HI8521
Procedure:
• Switch instrument on after connecting the pH elec-
trode and the temperature probe.
• Immerse the pH electrode and the temperature
probe in pH 7.01 buffer solution, shake briefly
and wait 1 or 2 minutes for thermal equilibrium.
• Press the RANGE key to display pH measurement.
pH
OFFSET
pH
SLOPE
°
C
°C
ON
OFF
°C
TEMPERATURE °C
°C
pH
ON
OFF
4 cm
(1½
")
RANGE
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