Trouble Reason HowtoFix
Calibration Error
Incorrect calibration
order (Er1)
Always calibrate pH 7 rst, then pH 4 or pH
10. Refer to Section 4.2.1.
(Er1)
Contaminated electrode
(Er1/Er4/Er5)
Thorougly clean off the electrode. Refer to
Section 6.
Aged electrode (Er1/
Er4/Er5)
Replace the electrode.
Dried-out electrode
(Er1/Er4/Er5)
Soak in the soaking solution overnight to
restore.
Electrode is not in full
contact with solutions
(Er1/Er4/Er5)
Air bubbles around the
sensor (Er1/Er4/Er5)
Make a quick stir in the solution to remove air
bubbles.
Pressing too fast
(Er2)
Wait for the reading to be fully stabilized
before pressing
to nish the calibration
(Er3)
Thorougly clean off the electrode. Refer to
Section 6.
(Er3)
(Er3)
Er4/Er5)
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