Malvern Mastersizer 3000 User Manual

Making measurements Chapter 4
Mastersizer 3000 Page 4-33
Measurement - Duration
The Measurement Duration settings can be used to separately specify both the red
and blue light measurement durations.
Section/option Description
Red measure-
ment duration(s)
Background measurement duration (seconds)
This facility will make a measurement using only clean dis-
persant – this is then subtracted from the sample measure-
ment by the system in order to ‘clean’ the data. This is often
set to the same duration as the sample measurement.
Sample measurement duration (seconds)
The optimum measurement time depends on the size of the
sample, its particle size distribution and the dispersion
accessory used. If a material is monomodal its essential par-
ticle size characteristics can be captured in less time than a
material with a broad particle size distribution, which will
need to be measured longer to ensure that the coarser parti-
cles have been properly represented.

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