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48
TROUBLESHOO
TING GUIDE
16. TROUBLESHOOTING GUIDE
SYMPTOMS
PROBLEM
SOLUTION
Slow response/excessive drift. Dirty pH electrode.
Soak the electrode tip in
HI70614
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
measurable range
mV scale out of range.
Dry membrane or dry
junction.
Soak electrode in
HI703004
storage
solution for at least 30 minutes.
Display shows symbol in
front of temperature reading.
Out of order or missing
temperature 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 batteries; Auto-off
feature is enabled: in this
case, meter shuts off after
selected period of non-use.
Replace batteries; Press
ON/OFF
.
"Errxx" message at start up.
Internal error.
Contact your local Hanna
Instruments Office.
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 the batteries.