Chapter 4 Making a measurement
Page 4-2 MAN 0386
4
Control of concentration is also important. Too little sample means measuring
mainly background noise. Too much sample means the measurement is distorted
by multiple scattering.
Making a measurement
Making manual and SOP measurements using the Scirocco 2000 is basically the
same as discussed in Chapter 4 of the main User Manual, but with two impor-
tant differences:
As the lid to the sample tray is interlocked for safety, if the lid is opened during
a measurement, the dispersion unit automatically shuts down to its standby
mode. Because of this, the sample must be added to the sample tray before the
measurement is started.
Secondly, the Add sample tab of the measurement display is not typically
used. Instead, obscuration triggering is used to start a measurement. Obscura-
tion triggering is where a measurement is only started when the obscuration of
the sample is between two preset values.
To make a basic manual measurement:
1. Open the lid to the sample area and add the sample to the sample tray. Add the
sample to the centre of the tray, especially for free-flowing samples, to prevent
the sample from self-feeding.
2. Close and lock the lid.
3. Alter the air pressure and feed rate setting by selecting Configure-Accesso-
ries... and moving the appropriate slider. Note that the air or feeder will not
actually start until the Airflow or Feed radio buttons are selected in the Mode
section of the dialogue. Position the control dialogue to the left of the screen
where it can be seen and readily accessed.
4. Select Measure-Manual to display the Measurement display. The system
will automatically measure an electrical background, align the system and then
measure the optical background.
5. Select the Options button to change any settings for the measurement.
Choose:
The Material tab to define the sample that is being measured.
The Measurement tab to set the measurement time.
Press the Measurement button in the Measurement tab to set the
obscuration settings.
MAN0386-1.0 Scirocco 2000.book Page 2 Friday, March 16, 2007 4:15 PM
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