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6 Troubleshooting
912/913/914 Meter
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6 Troubleshooting
6.1 General
If you experience problems during measurements, then you can check the
following aspects to eliminate them:
Application Difficult sample matrices or interfering influences may render accurate
measurements impossible (e.g. insufficient ionic strength, presence of
interfering ions, etc.).
Our Application Bulletins and Application Notes will support you in
choosing the appropriate analysis conditions and configuring the instru-
ment method.
Buffer solutions /
standard solutions
The precision of the measurements mainly depends on the correct calibra-
tion of the sensors. To do so, you should use clean and fresh buffer solu-
tions or standard solutions.
A common cause of incorrect calibrations is, for example, the use of an
old pH 10 or pH 12 buffer. Its pH value may markedly deviate from the
certified pH value of a new buffer as a result of the introduction of CO
2
from the air.
Sensors The sensors are the most important component in the entire measuring
system.
For the correct handling of sensors, please read the corresponding leaflets.
Instrument If the 912/913/914 Meter might be the cause of a measuring problem,
check all configuration and parameter settings first.
The 912/913/914 Meter will notify you of problems with respective
messages directly during operation.
You can find an explanation of these messages in the chapter Messages.
(see chapter 6.4, page 75)
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