Sartorius YDK01 Mode D'emploi page 19

Preparation (for Method 1 only)
(Distilled water is used in the
description.)
– Center the large-diameter beaker
(76 mm d) on the metal platform
– Fill it so that the distilled water is
approximately 5 mm below the rim
– Add three drops of tenside to the
distilled water
– Attach the thermometer to the rim of
the beaker using the retainer clip
– Clean the sieve with a solvent (especially
the wires that will be immersed) and
hang it from the frame
Measuring Procedure
(for Method 1 only)
Determining the Weight of the
Sample in Air
– Tare the balance
– Place the sample on the frame weighing
pan and weigh
– Record the weight W (a)
Determining the Buoyancy
G = W (a) – W (fl)
– Tare the balance again (with the sample
on the frame weighing pan)
– Place the sample under the sieve or
immerse it below the surface of the
liquid using the sieve
– Record the buoyancy "G," which
is displayed with a negative sign
1
)
Calculating the Specific Gravity
– Read off the temperature of the liquid
– Using the table at the back of this
manual, find the density ρ (fl) which
corresponds to the temperature
measured for distilled water
– Calculate the specific gravity using
the following formula:
W (a) · ρ (fl)
ρ =
0.99983 G
W (a) and G in g; ρ (fl) in g/cm
G = W (a) – W (fl)
1
) If you remove the pan hanger assembly
from the measuring device to do this,
make sure that no additional air bubbles
are on it when you re-immerse it in the
liquid; it is better to place the sample
directly under the pan using forceps
or a similar utensil.
3
+ 0.0012 g/cm
3
19