Measuring New Samples - Malvern Hydro 2000uP User Manual

Chapter 4

Measuring new samples

The above procedures are ideal if the SOP is set up or all the parameters for a man-
ual measurement have been specified. Users measuring a new material must either
create or modify an SOP or set up the options for a new manual measurement.
This section outlines the setup for measuring a new sample.
Measuring new samples - manual measurement
The basic procedure is the same as outlined above. When the user selects the
Options button in the measurement display, the Measurement Options dia-
logue appears. This dialogue controls all aspects of the measurement.
Press the Document button in the Measurement display to open the Document
dialogue. Add relevant details that will allow a user to reproduce the measurement
at a later date.
All the options available are basically the same when setting up an SOP. For more
details of these options see Chapter 4 of the main User Manual.
Measuring new samples - SOP measurements
Creating an SOP is easy. Select Configure-New SOP; the software will run
through an SOP Wizard. This wizard asks a series of questions, such as:
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Use the Materials tab to select a different material and dispersant or define the
optical properties of the new material. This tab also allows users to specify
options regarding the result calculation.
i
Note
If a material is created or modified the computer calculates a new scattering
model. This usually takes between one and 10 minutes, depending on the
power of the computer. However, if the ratio of the refractive index of the
sample to the dispersant is in the range 0.99 to 1.01, then this time may
substantially increase. Under these conditions we recommend that the
model is generated overnight.
Use the Measurement tab to set up measurement times, set measurement
alarms, etc.
what are the optical properties of the sample?
what is it suspended in?
how fast should the pump be?
how much ultrasonic dispersion is required?
do any additives need to be added to the sample to aid dispersion?
Making a measurement
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