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TROUBLESHOO
TING GUIDE
18. TROUBLESHOOTING GUIDE
Symptoms
Problem
Solution
Slow response / Excessive drift
Dirty pH electrode
Soak the electrode tip in
HI7061
Electrode cleaning
solution for 30 minutes and
then follow the Cleaning
procedure
Reading fluctuates up and
down (noise)
Clogged/Dirty pH electrode
junction
Clean the electrode.
pH scale out of range
Dry membrane (or junction)
Soak electrode in
HI70300
Storage solution for at least
30 minutes
Controller fails to calibrate
(or gives faulty readings)
Broken pH electrode
Replace pH electrode
Error messages are displayed
during pH calibration
procedure
Wrong (or contaminated)
buffer, dirty (or broken)
electrode.
Check that buffer solution is
correct and fresh
Check the electrode
“Errxx”
message at start up
Internal error
Contact your local Hanna
Instruments Office
Note:
For ORP Electrodes: polish the metal tip with a lightly abrasive paper (paying attention not
to scratch the surface) and wash thoroughly with water.
Note:
It is recommended to keep at least one spare electrode handy. When problems are not
resolved with a simple maintenance procedure, change the probe and recalibrate.
