accumet AE150 pH Benchtop Meter
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Troubleshooting Guide
Error Messages
The table provides a quick guideline for diagnosis of possible problems indicated by meter
generated messages. The table also provides possible solutions to problems encountered.
Error Message Indicates
Cause
Corrective Action
Err icon
Wrong keypad
input
Key does not work in the current
operation mode
Release key and select valid
keys depending on mode
Err + Electrode
icons
Calibration
error
Buffer value does not match
value displayed or electrode is
disconnected or failing
Use fresh buffer solution, check
electrode connection or
possibly replace electrode
Ur or Or (in
upper Display)
Measured
value is out of
range
•
Electrode not connected,
•
Electrode clogged, dirty or
broken
•
Meter not calibrated
•
Measurement is under range or
over range
•
Make sure electrode is
connected
•
Clean or replace electrode
Recalibrate the meter
•
Treat samples to bring within
meter measuring range
General Troubleshooting
Problem
Probable Cause
Remedial Action
No display
Main power not switched on
Switch on the power supply
AC Adapter socket not inserted properly Re-insert AC Adapter socket
Unstable reading
Insufficient reference electrolyte in
electrode
Fill electrode with reference electrolyte
Broken electrode
Replace electrode
External noises or induction (i.e.
electrical noise caused by a nearby
motor)
Remove or switch off interfering
device
Dirty electrode
Clean the electrode, hydrate and then
rejuvenate if necessary
Slow response
Dirty electrode
Clean the electrode, hydrate and then
rejuvenate if necessary
Meter not
responding to key
HOLD mode in operation
Cancel Hold mode by pressing the
HOLD key
Internal program error
Reset all internal programs by
removing and reinserting the A/C
adapter
