47
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
HI70300
or
HI80300
Storage Solution for at least 1 hour
before taking measurements.
TROU
BL
ESH
OO
TIN
G G
UI
DE
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
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 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 the 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.
