Malvern Mastersizer 3000 User Manual

Making measurements Chapter 4
Mastersizer 3000 Page 4-35
Measurement - Sequence
The Measurement Sequence settings window allows you to specify the number of
measurements and the duration of any delay between measurements.
Section/option Description
Measurements If the material is difficult to disperse, requiring ultrasonica-
tion, surfactant or both to achieve a stable dispersion, sev-
eral measurements of the same sample may be required in
order to determine the ideal dispersion time. In general,
repeat measurements are performed until the last measure-
ment obtained agrees closely with the previous one.
Enter the Number of measurements (up to 999) and Delay
between measurements (up to 9999 seconds). Specifying
several measurements, e.g. 5, allows repeatability to be
assessed.
In wet measurements a Pre-measurement delay (s) can be
specified. This delay occurs before the very first measure-
ment but after Ultrasound has been stopped, assuming the
pre-measurement ultrasound option is selected.

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