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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 elec‑
trodes) and soak the electrode in HI70300 or HI80300 Storage Solution for at least 1 hour before
taking measurements.
TROUBLESHOOTING GUIDE
SYMPTOMS PROBLEM SOLUTION
Slow response/excessive drift. Dirty pH electrode. Soak the electrode tip in HI7061
solution for 30 minutes and then
follow the Cleaning Procedure.
Reading fluctuates up and down (noise). Clogged/dirty junction. Low
electrolyte level (refillable
electrodes only).
Clean the electrode. Refill with fresh
electrolyte (refillable electrodes
only).
Display shows blinking full scale value. Reading out of range. Check that sample is within measur‑
able range
mV scale out of range. Dry membrane or dry junction. Soak electrode in HI70300 storage
solution for at least 30 minutes.
Display shows symbol in front of
temperature reading.
Out of order or missing tempera‑
ture probe.
Replace temperature probe or check
the connection.
Display shows "Clean electrode"
blinking.
Difference between new and
previous calibration has been
detected.
Clean electrode and recalibrate.
If the problem remains, check the
buffer solutions.
Meter does not work with temperature
probe.
Broken temperature probe. Replace temperature probe.
Meter fails to calibrate or gives faulty
readings.
Broken pH electrode. Replace electrode.
Error messages are displayed during pH
calibration procedure.
Wrong or contaminated buffer,
electrode dirty or broken.
Check that buffer solution is correct
and fresh.
Meter shuts off. Dead accumulators; Auto‑off
feature is enabled: in this case,
meter shuts off after selected
period of non‑use.
Recharge accumulators or replace
batteries; Press ON/OFF.
"Errxx" message at start up. Internal error. Contact your dealer or any Hanna
Service Center.
The instrument does not start when
pressing ON/OFF.
Initialization error. Press and hold down ON/OFF for
about 20 seconds or disconnect and
then connect one accumulator.
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