Appendix B: Measuring Special Samples
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B.2
Special Filling Techniques
Bubbling samples
If the sample to be measured tends to form gas bubbles, degas it before the
measurement (see Appendix B.1).
If this is not possible, introduce the sample at a temperature higher than the
measuring temperature.
You can also put the density meter at a slight angle by means of proper spacers
below the right side of the DMA M to allow the bubbles to escape due to buoyancy.
Suspensions and emulsions
Suspensions or emulsions may tend to separate in the measuring cells, giving
incorrect results. Leave such samples in the measuring cell as briefly as possible.
Prethermostat them before filling.
It may help to put spacers below the left legs of DMA M, thus putting it at an angle
to counterbalance the separation force generated by the oscillation of the
measuring cell.
Highly viscous samples
Highly viscous samples can be heated up to lower the viscosity. Always heat the
sample to a temperature that is approx. 15 °C higher than the measuring
temperature, which can be 90 °C maximum.
Pastes
Paste-like materials like toothpaste or tomato ketchup can be filled by syringe.
Inject these kinds of samples into the measuring cell by pushing the plunger very
slowly and continuously.
If the samples have a very high viscosity, you can fill them into the syringe by
pulling the plunger completely out of the syringe, filling it from the back using a
spoon and then mounting the plunger again.
Liquids in aerosol cans
For the quality control of aerosol cans, you can use the Anton Paar Aerosol
Adapter (Mat. No. 74650) to fill the liquid safely and conveniently into your
DMA M. For details, see the Aerosol Adapter instruction manual.
Gases
It is possible to measure gases with the DMA M. For details, contact your local
Anton Paar representative and ask for the respective application report and the
necessary accessories.