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2
Chapter 2
What the dispersion unit does
How the dispersion unit is controlled
Page 2-2
The sole purpose of any sample dispersion unit is to prepare the sample then
deliver it to the measurement zone of the optical bench so that it can be measured.
The Hydro 2000µP allows the Mastersizer to be used for particle-in-liquid particle
sizing and has been specifically designed so that only small amounts of sample and
suspending liquids (dispersants) are required.
The small volume of the Hydro 2000µP is ideal when using solvent dispersants or
when samples and dispersants are either expensive or hazardous.
The materials used in the manufacture of the dispersion unit maximise the range of
samples which can be measured.
Other features of the dispersion unit include:
Variable speed pump – allows a wide range of particle sizes and densities to
be suspended and circulated.
Ultrasonic system (optional) – allows particle agglomerates to be dispersed
and assists in removing bubbles from the system.
Warning!
When using solvents, especially those with low ignition points, minimise
the use of ultrasonics. There is a remote possibility that localised heating
caused by the ultrasonic action may cause an explosive reaction. Check the
Material Safety Data Sheets for all substances used.
Temperature sensing – an internal sensor monitors the temperature of the
dispersant. The software can be configured so that measurements are only
made between user specified temperature limits. This can be used to ensure
that the instrument can only be used when it has reached the correct tempera-
ture.
The dispersion unit is controlled using a single software dialogue with sliders for
the pump speed and ultrasonic power (Chapter 3 has details). The dialogue also
has pump pause, drain valve and Anaerobic fill buttons.
When controlled through a Standard Operating Procedure (SOP), the software
tells the user what value to set for each parameter.
Hardware features
MAN 0389
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