Malvern Mastersizer 3000 User Manual

Chapter 5 Viewing measurement results
Page 5-20 MAN 0474
skewness
kurtosis
In the above formulae K and X depend on the distribution being calculated as
shown in this table:
The various derived diameters are related by:
For “mono-size” distributions such as latex, the distribution mean is reported as
the geometric mean of the size class and standard deviation, skewness and kur-
tosis are reported as zero.
The procedure used for other parameters of the distribution is to create a spline fit
to the fundamental result. Intermediate values are then read from this curve allow-
ing interpolation of percentile points which do not coincide with the measurement
size band boundaries.
Distribution K
X
i
Volume 3 V
i
Surface 2 V
i
/d
i
Length 1
V
i
/d
i
2
Number 0
V
i
/d
i
3
Skew
X
i
d
i
d–
3


3
X
i

----------------------------------
DK 3 K+
3
dd
2
3
2
+–

3
------------------------------------------------------------------------
==
Kurt
X
i
d
i
d–
4


4
X
i

----------------------------------
3–
DK 4 K+
4
d 4DK 3 K+
3
3d
3
6d
2
++–

4
-------------------------------------------------------------------------------------------------------------------------
3–==
Dmn
mn–
Dm0
m
Dn0
n
-----------------------
=

Malvern Mastersizer 3000 Specifications

General

Measurement principle	Laser diffraction
Blue laser wavelength	470 nm
Sample dispersion options	Wet and dry dispersion
Data acquisition rate	10 kHz
Particle size range	0.01 to 3500 microns
Laser type	He-Ne and solid state
Accuracy	Better than 1%
Repeatability	Better than 0.5%
Technology	Mie and Fraunhofer theories
Sample dispersion units	Hydro MV, Hydro LV, Aero S
Optical model	Mie theory
Power requirements	100-240 V, 50/60 Hz
Detector arrangement	Log-spaced array