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IMPORTANT:
After performing any of the cleaning procedures, rinse the electrode thoroughly
with distilled water, refill the reference chamber with fresh electrolyte (not
necessary for gel-filled electrodes) and soak the electrode in HI 70300 or HI
80300 Storage Solution for at least 1 hour before taking measurements.
TROUBLESHOOTING GUIDE
Symptoms Problem Solution
Slow response / exces-
sive drift.
The reading drifts.
Low electrode condi-
tion.
Readings fluctuate up
and down (noise).
The display shows
blinking dashes during
pH measurements.
The display shows
blinking dashes during
mV measurements.
Out of range mV scale.
The meter does not
work with temperature
probe.
Dirty pH electrode.
Bad or dirty pH electrode.
Clogged or dirty junction.
Low electrolyte level (for
refillable electrodes
only).
Out of range pH scale.
Out of range mV scale.
Dry membrane/junction.
Broken temperature
probe.
Soak the electrode tip in
HI7061 solution for about 30
minutes, then clean the elec-
trode.
Soak the electrode tip in
warm (approx. 50-60°C)
HI7082 solution. Refill with
fresh electrolyte solution (for
refillable electrodes only).
Replace the electrode.
Clean the electrode.
Refill with fresh electrolyte so-
lution (for refillable elec-
trodes only).
a) Recalibrate.
b) Make sure the pH sample
is in the specified range.
c) Check the electrolyte level
and the general state of
the pH electrode.
Electrode not connected.
Soak in HI 70300 Storage so-
lution for at least one hour.
Replace the temperature
probe.