Thermo Orion Star - pH Events;Errors

XIII-3
Orion Star Series Meter
Thermo Electron Corporation
Care and Maintenance
pH Events/Errors
Error
Code
Description
Press
to Clear
Cause Trouble Shooting
105 pH Auto-Buffer
Failure
Yes Auto-buffer not
recognized, will only
happen in remote
control
• Check that electrode is in
correct buffer.
• Check that correct buffer set in
selected in the method setup.
• Clean electrode & refill
reference electrode
• Perform a manual calibration.
Some electrodes may operate
outside of the range for pH
autocalibration. This may be
a sign of electrode aging and
is normal.
107 pH Calibration
Standard Error
Yes The milivolts being
measured are the
same for two different
standards.
• Check that the two different
buffers are being used and
that the electrode is in the
correct buffer.
• Make fresh buffers and repeat
the calibration.
109 Bad pH Slope Yes The pH slope is not in
the range of 80% to
120%
• Repeat calibration using fresh
buffers
• Clean electrodes and refill
reference electrode
• Refer to electrode instruction
on how to check electrode