Anton Paar DMA 4100 Manual De Instrucciones página 26

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8 Measurements
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Important:
• Before filling any sample into the DMA, make sure that all wetted parts
made of PTFE (adapters) and borosilicate glass (measuring cell) are
resistant to the sample. Borosilicate glass is not resistant to samples
containing hydrofluoric acid, even in traces.
• Have suitable cleaning fluids at hand for cleaning the measuring cell (see
Chapter 9).
• Samples with a moderate tendency to corrode borosilicate glass such as
strong alkali solutions (e.g. caustic soda) can be measured with the DMA
at 20 °C. However, take care to remove such samples immediately after
measurement and rinse the measuring cell thoroughly. Check the validity
of the adjustment more frequently than generally recommended.
Hints:
• The sample must be homogeneous and free of gas bubbles. Suspensions
or emulsions may tend to separate in the measuring cell. Tip: Put spacers
below the left legs of the DMA to counteract sample separation.
• Pre-thermostatting the sample reduces the measuring time.
• If the sample to be measured tends to form bubbles the substance should
be degassed before the measurement. If this is not possible then
introduce the sample at a temperature higher than the measuring
temperature. Tip: Slightly slant the density meter to make the right-hand
side higher.
There are several options for filling the samples into the measuring cell: By
syringe with Luer tip (see Fig. 8 - 2), by peristaltic pump, sample changer or
sample filling device.
Filling by syringe:
Fig. 8 - 2 Filling using a syringe
• Never fill the samples without the Luer injection adapters (see Fig. 5 - 1).
• Attach the syringe to the Luer injection adapter and fill the sample in the
measuring cell by pushing the plunger of the syringe slowly and continuously
until liquid comes out of the other adapter.
Adapter Luer cone
Waste
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