Derived parameters
The Measurement Parameters window shows the “standard values”, those
derived parameters which are most commonly used. In addition a wider set of
parameters can be defined by the user during SOP creation. These are listed
under Type in the Edit Derived Parameter dialogue:
The following parameters are available:
.
Dv(x1) – the percentiles, the size in microns which the specified % of the
spray is smaller than. The commonest are Dv(10), Dv(50) and Dv(90),
which are among the Standard Values, but any other % can be specified.
.
D[x1, x2] – the moment means. The most commonly used are:
D[3,2] – the Surface Area Moment Mean Diameter, also known as the
Sauter Mean Diameter.
D[4,3] – the Volume Weighted or Mass Moment Mean Diameter.
'
Note
.
The statistics of the distribution are calculated from the results using the
derived diameters D[m,n], an internationally agreed method of defining
the mean and other moments of particle size. See British Standard
BS2955:1993 for details.
CHAPTER 10
Spraytec
Page 10.2 MAN 0368
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