Hanna Instruments HI 84529-01 - Manual (Page 46)

www. hannainst .com 46 Maintenance
Symptoms Problem Solution
Slow response/excessive
drift. Dirty pH or reference
electrode.
Soak the electrode tip HI 70640
solution for 30 minutes and
follow the cleaning procedure.
Refi ll reference electrode with
new fi ll solution.
Reading fl uctuates up and
down (noise).
Clogged/dirty junction.
Low electrolyte level
(reference electrode).
Cable connection.
Clean the pH electrode. Refi ll
reference electrode with fresh fi ll
solution. Check cable connection
to meter and verify protective
cap is off .
While in pH reading mode,
-2.00 or 16.00 pH is displayed
blinking.
Reading out of range.
Check cable connection to meter
and verify protective cap is off .
Check the quality of the sample.
Clean the electrodes. Refi ll with
fresh fi ll solution.
The meter does not accept
the pH buff er solution for
calibration.
Broken pH or reference
electrode.
Follow the electrode cleaning
procedure. If the error persists
replace the electrode or contact
your local Hanna Representative.
The pump calibration can't be
performed.
Broken pump tubing.
Wrong or contaminated
pump calibration solution.
Broken pH electrodes.
Verify tubing, valve, syringe
are intact and solution passes
when pump is primed and no air
bubbles are present. Check the
pump calibration solution. Verify
electrodes are calibrated. Prepare
another standard, prime the
pump and restart the calibration.
The temperature probe is
connected, but the meter
displays "MTC".
Broken temperature
probe.
Replace temperature probe.
Troubleshooting
Guide