13 Measuring
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13.4 Filling Samples
To achieve highly accurate measuring results, fill the samples into the measuring
cell homogeneously and without bubbles.
Important for high accuracy measurements
If you use a syringe to fill the instrument, we recommend using a 2 mL syringe
only to fully utilize the instrument’s accuracy (especially with DMA 5000 M). Inject
the entire sample volume. The syringe can stay connected to the filling adapter
during the measurement.
If you use syringes with higher volumes, carefully disconnect the syringe from the
filling adapter after filling the sample. Otherwise, errors due to the weight of the
syringe are possible.
Make sure to apply exactly the same filling procedure for checks, adjustments and
measurements.
WARNING
Filling samples and cleaning liquids which the wetted parts are not resistant to
will corrode the wetted parts. Sample leaking from corroded parts may cause
serious injuries.
Before filling any sample or cleaning liquid into your DMA M:
•
make sure that all safety instructions concerning the use of chemicals and
the use of flammable chemicals are met (see Chapter 2).
•
make sure all wetted parts are resistant to the filled-in liquid (see Appendix
A.2).
•
make sure that you have suitable cleaning fluids at hand for cleaning the
measuring cell (see Chapter 14.1).
•
If a sample changer is connected, check the resistance of the wetted
parts. For information about the materials, see the corresponding
instruction manual of the sample changer.
NOTICE
Samples with a moderate tendency to corrode borosilicate glass such as
strong alkali solutions (e.g. caustic soda) can be measured with the DMA M.
•
However, take care to remove such samples immediately after
measurement and rinse the measuring cells properly.
•
Check the validity of the adjustment more frequently than generally
recommended.
•
Perform a new adjustment, if necessary.
•
The measuring temperature for strong alkali solutions should not be
higher than 20 °C. Higher temperatures dramatically increase the speed
of corrosion.
