Sartorius YDK03MS Mode D'emploi page 19

Method 2
A liquid with a density which is lower than that of the solid object which is to be
measured must be used as a buoyancy medium . Good results have been achieved with
ethanol (up to a density of approx . 0 .8 g/cm
The negative effect of the liquid's surface tension on the results is less noticeable
when using ethanol than when using distilled water . It is therefore not necessary to
add surfactants .
Valid safety precautions must be taken when working with ethanol .
The second method should be used if the density of the solid object only differs
slightly from that of distilled water . As the sample is suspended in water, measuring
errors may occur if the first method is used . It also makes sense to use the second
method to determine the density of a granulated substance . In this case, it would be
difficult to place the entire sample under the sieve when using the first method .
Do not use ethanol if the sample could be attacked or dissolved by it .
Preparation
In the following description, distilled water is used .
Procedure
Place the beaker with the larger diameter (d 90 mm) on the center of the bridge
t
Fill the beaker until the distilled water is approximately 5 mm below the rim .
t
Add three drops of surfactant to the distilled water .
t
Attach the thermometer to the rim of the beaker using the retainer clip .
t
Clean the sieve with a solvent (paying particular attention to the immersed wires)
t
and hook on to the frame .
) .
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Operating Instructions YDK03MS | YDK04MS
Operation
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