Metrohm 949 - Messages

7.3 Messages
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Problem Cause Remedy
A non-Metrohm power
supply unit is connected.
￭ Use only the power supply unit provided
during measurement operation.
The measured value
is evidently wrong.
The pH calibration is faulty. ￭ Check and repeat the calibration.
￭ Check and/or replace the buffers.
￭ Check the buffer selection in the settings.
The temperature specifica-
tion is incorrect.
￭ Enter the correct measuring temperature.
The glass membrane or the
diaphragm is contam-
inated.
￭ Clean the membrane or the diaphragm fol-
lowing the instructions in the correspond-
ing leaflet.
The electrolyte is overaged. ￭ Replace the electrolyte.
The sensor is defective. ￭ Replace the sensor.
The slope is insuffi-
cient during calibra-
tion.
The glass membrane or the
diaphragm is contam-
inated.
￭ Clean the electrode following the instruc-
tions in the leaflet.
The hydrated layer of the
glass membrane is reduced
by anhydrous solutions.
￭ Immerse the glass membrane in deionized
water for 5 min to restore the hydrated
layer.
The buffer solutions are not
OK.
￭ Replace the buffer solutions.
The sensor is "worn out". ￭ Replace the sensor.
7.3 Messages
The following error messages may appear during calibration:
Error message
Meaning
NOT STABLE
The button was pressed during an unsta-
ble signal. Wait for the stability signal to
confirm the calibration point.
WRONG BUFFER The buffer is contaminated or is not a member
of one of the detected buffer families.
SLOPE OUT OF RANGE The slope of the calibration curve is outside the
accepted range between 80% and 120%.