Metrohm 912 User Manual

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6 Troubleshooting
912/913/914 Meter
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73
Problem Cause Remedy
The pH value or the tem-
perature of the measuring
solution is not stable.
￭ Measure under exclusion of air.
￭ Regulate the measuring solution's tempera-
ture.
Conductivity is too low
because of an unsuitable
sensor.
￭ Use a suitable sensor.
Measurement takes place
in an organic solution.
￭ Use a suitable sensor.
Non-Metrohm power sup-
ply unit used for charging
the battery.
￭ Use only the supplied power supply unit
during measurement operation.
O
2
cap is worn out. ￭ Use a new O
2
cap.
The measured value
is evidently wrong.
pH calibration is faulty. ￭ Check/repeat calibration.
￭ Check/replace the buffer.
￭ Check the buffer selection in the settings.
Conductivity calibration is
faulty.
￭ Check/repeat calibration.
￭ Check the value for the standard.
￭ Check the value for the reference tempera-
ture.
￭ Check the value for temperature compen-
sation.
DO calibration is faulty. ￭ Check/repeat calibration.
￭ Check the value for temperature compen-
sation.
￭ Check the value for the atmospheric pres-
sure compensation.
The temperature input is
wrong.
￭ Enter the correct measuring temperature.
The wrong temperature
sensor type is selected.
￭ Check the temperature sensor type (Pt1000
or NTC) and select the correct one, if nec-
essary.
The glass membrane or the
diaphragm is contami-
nated.
￭ Clean the membrane or the diaphragm fol-
lowing the instructions in the correspond-
ing leaflet.
The electrolyte is overaged. ￭ Replace the electrolyte.

Metrohm 912 Specifications

General

Brand	Metrohm
Model	912
Category	Measuring Instruments
Language	English