Metrohm 914 pH / Conductometer Bedienungsanleitung PDF herunterladen (Seite 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

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)

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Metrohm 914 pH / Conductometer Bedienungsanleitung Seite 71