LaMotte 5 Series pH Meter - Manual (Page 16)

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5. ELECTRODE CARE AND MAINTENANCE
For best results, store the pH probe bulb wet. Store the pH glass bulb
in pH probe storage solution. NEVER use deionized water for storage.
Wash probes with clean water after each use.
pH probes are susceptible to contamination and dirt. Clean them as
needed using mild detergent and warm water. Blot the probe gently with
soft tissue paper to dry. Avoid excessive rubbing of the glass membrane
and avoid touching it with the fi ngers. Recalibrate after cleaning.
6. TROUBLESHOOTING
Problem Cause Solution
No display Batteries not in place. a) Insert batteries.
b) Re-insert batteries in correct
polarity.
“LO” displays
in the LCD
Low battery Replace batteries.
Unstable
reading
a) Electrode not deep
enough in sample
b) Dirty electrode.
c) Broken electrode
a) Place electrode deeper in
sample.
b) Clean electrode and recalibrate.
c) Replace electrode.
Not able to
calibrate
a) Display freezes
b) Faulty electrode
c) Inaccurate buffer a) Release reading by pressing
HOLD.
b) Replace electrode.
c) Replace expired buffer solutions.
Er1 Buffer value out of tolerance Use new calibration solution and
recalibrate. Ensure correct pH
buffer group was selected.
Er3 ISE slope not within the
specifi ed tolerance
Recalibrate
Er5 Upon exit of calibration mode,
a 1-point calibration was
attempted with a pH buffer
other than 7.00 or 6.86
Repeat pH calibration using one
or more points which include
either 7.00 (USA) or 6.86 (NIST)
standards.
Oe Over range: reading exceeds
maximum value
Ensure that the value being
measured is within the range of
the selected mode. Confi rm that
electrode(s) are connected and
working properly.
uE Under range: reading
exceeds minimum value