Anton Paar 84138, Instruction Manual

Page: 29 / 162

C96IB01 29
EN
9 Performing a Measurement
General instructions for measuring
• Make sure that the measuring cell is filled free from gas bubbles. Possible
reasons for gas bubbles in the measuring cell are:
• Gas bubbles in the sample
• Leaky connection of the filling tube, the pump or the screw plug
• Make sure that the measuring cell is fully filled.
• Make sure that the sample temperature does not deviate too strongly from the
ambient temperature.
When measuring samples with a temperature which greatly differs from the
ambient temperature and a measurement mode with a temperature stability
criterion is selected, the measurement takes longer because the sample
temperature first has to adjust to ambient temperature.
If the sample measured is outside the temperature specifications (0 to +40 ° C),
the display shows the warning sign until the sample has reached a measurable
temperature. If the measured value is nevertheless saved, it is shown with an
exclamation mark.
WARNING
Handling samples with temperatures of more than 70 °C bears the
danger of heavy burns. Make sure you wear protective clothes or
ensure alternative protection from burns when handling high
temperature samples.
NOTICE Before performing a measurement, make sure that the wetted parts
are resistant to the sample (see Chapter 15).
NOTICE Sample containing dissolved CO
2
will cause bubbles within the
measuring cell with the effect of invalid measurement results. Make
sure your sample is degassed carefully.
Degassing a sample can be done by:
•
boiling the sample for several minutes,
• stirring the sample for 5 to 15 minutes until no bubbling occurs
any more or
• putting the sample for approximately 5 to 10 minutes into an
ultrasonic bath.