Electrode Care And Maintenance - LaMotte pH 5 Plus Manual

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
No display
"LO" displays
in the LCD
Unstable
reading
Not able to
calibrate
Er1
Er3
Er5
Oe
uE
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Cause
Batteries not in place.
Low battery
a) Electrode not deep
enough in sample
b) Dirty electrode.
c) Broken electrode
a) Display freezes
b) Faulty electrode
c) Inaccurate buffer
Buffer value out of tolerance
ISE slope not within the
specifi ed tolerance
Upon exit of calibration mode,
a 1-point calibration was
attempted with a pH buffer
other than 7.00 or 6.86
Over range: reading exceeds
maximum value
Under range: reading
exceeds minimum value
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Solution
a) Insert batteries.
b) Re-insert batteries in correct
polarity.
Replace batteries.
a) Place electrode deeper in
sample.
b) Clean electrode and recalibrate.
c) Replace electrode.
a) Release reading by pressing
HOLD.
b) Replace electrode.
c) Replace expired buffer solutions.
Use new calibration solution and
recalibrate. Ensure correct pH
buffer group was selected.
Recalibrate
Repeat pH calibration using one
or more points which include
either 7.00 (USA) or 6.86 (NIST)
standards.
Ensure that the value being
measured is within the range of
the selected mode. Confi rm that
electrode(s) are connected and
working properly.
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