8
For greatest accuracy, frequent calibration of the instrument is recom-
mended. The instrument should be recalibrated for pH:
a) Whenever the electrode is replaced.
b) At least once a month.
c) After testing aggressive chemicals.
d) Where extreme accuracy is required.
PREPARATION
Pour small quantities of pH7.01 (HI7007) or pH4.01 (HI7004) or
pH10.01 (HI7010) solution into a clean beaker.
To obtain accurate readings, use pH7.01 (HI7007) if you are going
to measure neutral or close to neutral samples, pH4.01 (HI7004) if
you are going to measure acidic samples or pH10.01 (HI7010) for
alkaline measurements.
If you need to calibrate to NIST standards, use pH6.86 (HI7006)
instead of pH7.01 and pH9.18 (HI7009) instead of pH10.01.
PROCEDURE
• Connect the probe and switch the meter
on, then press the pH key to display pH
measurement.
• Remove the protective cap from the probe,
rinse and immerse it in the buffer and stir
gently. Wait a couple of minutes for the
reading to stabilize.
• Take the temperature of the buffer solution,
e.g. “10.0 °C”, as follow:
Select the °C mode and read the displayed
value.
• Adjust the pH calibration knob until the LCD
shows the pH value at the above temperature
(see the pH versus temperature chart).
• The pH calibration is now complete.
pH CALIBRATION
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