Sartorius YDK03MS Mode D'emploi page 25

− The immersion of the wires of the sample holder or sieve
When using this specific density determination kit, the buoyancy G = [W (a) – W
(fl)] must be multiplied by the factor 0 .99983 (corr) . Expanded formula:
W (a) · [ρ (fl) – ρ (a)]
ρ =
[W (a) – W (fl)] · corr
This factor allows for the buoyancy of the wires which are submerged deeper when
the sample is introduced .
How this Correction Factor Is Derived:
The buoyancy caused by the submerged wires depends on the height "h" by which
the liquid rises when the sample is immersed .
Here, the sample volume V (pr) corresponds to the liquid volume V (fl) .
The sample volume is determined by measuring the buoyancy . Hence:
V (pr) = V (fl)
or
W (a) – W (fl)
=
ρ (fl)
4 · [W (a) – W (fl)]
Then h =
ρ (fl) · π · D
The buoyancy "A" caused by the immersed wires is:
π · d
2
A = 2 ·
· h · ρ (fl)
4
When "h" is used:
2 · π · d · 4 · [W (a) – W (fl)] · ρ (fl)
2
ρ =
4 · ρ (fl) · π · D
d
2
A = 2 · · [W (a) – W (fl)]
D
2
+ ρ (a)
π · h · D
2
4
2
2
Operating Instructions YDK03MS | YDK04MS
Formulas
25