765 Laboratory pH Meter
42
Operation
Calibration error messages
When errors occur during calibration or when the
determined electrode data are out of range, an
error message will be displayed.
The meter cannot identify the buffer solution in use.
This message is only momentarily displayed during
calibration.
Possible causes:
• Buffer solution does not belong to
the selected buffer set
• Electrode defective
• Electrode not connected
• Break in electrode cable
• Wrong buffer temperature selected
(for manual temperature compensation)
The meter identified two identical buffer solutions.
This message is only momentarily displayed during
calibration.
Possible causes:
• Same or similar buffer solution used for second
calibration step
• Buffer solutions contaminated
• Electrode defective
• Electrode not connected
• Break in electrode cable
Calibration was canceled after approx. 2 minutes,
because the electrode drift was too large. This mes-
sage is only momentarily displayed during calibra-
tion.
Possible causes:
• Electrode defective
• No electrolyte in the electrode
• Electrode cable not sufficiently shielded
or defective
• Strong electric fields influence the
measurement
• Major temperature fluctuation of the buffer
solution
• No buffer solution or extremely diluted
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