Retsch EasySieve Manual de usuario descargar pdf (Pagina 68)

Mean - Description of the Menu Items

- 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/mmP

- Specific surface sm [mm

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)

1684

−

with

%)84Q(xx

384

;

%)16Q(xx

316

;

%)50Q(xx

350

- 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.

Pos: 8.23 /0 000 5 Üb ers chrif te n/1. 1. 1 Über sc hrif te n/11 1 M aßei nhei te n @ 2 \mod_1254210254320_9.doc @ 16692 @ 3 @ 1

8.3.2 Measuring Units

Pos: 8. 24 /00 020 BDA Softwar e/20 010 Eas ySie ve Kapit elsam mlung/ 000 7 EasySi eve Ke nngröß enf enster /0709 E asySi eve Mod ul Maßei nhei ten d es K enng röß en fenst ers @ 2\mod_1260367710651_9.doc @ 18037 @ @ 1

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

Pos: 9.1 / 00 005 Über sc hrif ten /1. Ü ber sc hrift en /1 M itt elwer t – Besc hrei bu ng d er M enü pun kte @ 2\ mod_1260368520979_9.doc @ 18059 @ 1 @ 1

9 Mean - Description of the Menu Items

Pos: 9.2 / 00 020 BDA So ftw are/ 200 10 E asy Sie ve K apit els am mlung /0 007 1 Ea sySi ev e Mit tel wer t – B eschr ei bung der Me nüpu nk te/0 710 1 Eas ySi e ve Mo du B ef ehl z ur Bil dung des Mi ttel wer tes @ 2\mod_1260367936526_9.doc @ 18052 @ @ 1

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.

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Retsch EasySieve Manual de usuario Pagina 68

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