Retsch EasySieve - Handbuch (Seite 68)

Mean - Description of the Menu Items
68
- the values characterising a possible RRSB distribution d', n and correlation
(correlation = correlation of the RRSB lines found with the measured
distribution). The RRSB characteristics are calculable only if the Q3 values
of at least 2 sieve fractions lie between 5% and 95%.
- Specific surface Sv [mm
P
2
P
/mm
P
3
P
]
- Specific surface sm [mm
P
2
P
/g]. If no material density was defined for the
sieving task, the selection of this characteristic is disabled.
- Sauter diameter xSt = 6/Sv
- AFS grain fineness number: (Only calculable if the appropriate sieves were
used.) The selected sieves must be a subset of the AFS series of sieves
0.020 mm, 0.063 mm, 0.090 mm, 0.125 mm, 0.180 mm, 0.250 mm, 0.355
mm, 0.500 mm, 0.710 mm, 1 mm, 1.4 mm, 2 mm, 2.8 mm, 4 mm, 5.6 mm.
Furthermore, all AFS sieves must be included between the smallest and the
largest sieve.
- CV value Coefficient of variation
Standard deviation of the particle size distribution divided by the median;
(dimensionless)
50
16 84 50
x
x x
CV
−
=
with
%) 84 Q ( x x
3 84
= =
;
%) 16 Q ( x x
3 16
= =
;
%) 50 Q ( x x
3 50
= =
- MA value Mean Aperture = D50 value = median diameter x50
The calculation of the specific surfaces Sm and Sv is always based on a sphere
model.
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8.3.2 Measuring Units
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The menu item summarises the settings of the measuring units in the
characteristics window. You can choose between presenting the grain size in µm
or mm. The totals and fractions are shown normalised to 1 or in % as desired.
Fig. 52: Measurement Units in the Characteristics Window
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9 Mean - Description of the Menu Items
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This command serves to form the mean value of several sievings saved under one
sieving task. A precondition for the formation of the mean is the use of the same
sieve stacks in all the sievings used as the basis for forming the mean.