Metrohm 914 pH / Conductometer - Manual (Page 71)

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6 Troubleshooting
pH Meter/Conductometer
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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 or
standard solutions.
A common cause of incorrect calibrations is, for example, the use of an
old pH 10 or pH 12 buffer. The pH value of such buffers may markedly
deviate from the certified pH value of a new buffer as a result of the intro-
duction 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 leaf-
lets.
Device If the pH Meter/Conductometer might be the cause of a measuring
problem, check all configuration and parameter settings first.
The pH Meter/Conductometer will notify you of problems with respec-
tive messages directly during operation.
You can find an explanation of these messages in the chapter Messages.
(see Chapter 6.4, page 65)