Software features Chapter 3
Scirocco 2000 Page 3-3
Use one of the following methods to ensure that the correct air pressure is being
used:
Perform a number of measurements at different air pressures and look for a
‘plateau’ of stable results. Choose the lowest air pressure commensurate with a
stable result.
If the sample can be recovered after measurement, and shows no significant
change when re-measured, the air pressure is acceptable.
If the sample can also be measured using a wet dispersion unit, and there is no
significant difference in the result, the air pressure setting is acceptable.
The air pressure control will not operate until the Air flow radio button is selected
from the Mode area of the dialogue.
Feed rate control
The Scirocco 2000 uses a vibrating tray to feed the sample into the dispersion sys-
tem. The rate at which sample is fed is governed by the vibration amplitude and the
type of tray fitted.
Adjust the feed rate to produce a steady flow of sample into the dispersion system
and to obtain the optimum sample concentration through the measurement cell. If
the feed rate is too high, the sample concentration may become too high and any
agglomerates may not disperse correctly. If the feed rate is too low, the concentra-
tion may become too low and/or the sample flow may become intermittent. The
General Purpose tray has an adjustable slit to help maintain a steady sample feed.
Sample concentration is monitored using the obscuration reading in the Meas-
urement Display dialogue.
The feed rate control will not operate until the Feed radio button is selected from
the Mode area of the dialogue.
Mode selection
The Scirocco 2000 is turned on/off using the mode buttons: Standby, Air flow
and Feed. The status line describes the current state of the Scirocco 2000. The but-
tons operate as follows:
Standby – sets the unit into an inactive mode. The unit may be automatically
set to this mode if an error condition is detected.
Air flow – turns on the vacuum and checks the minimum vacuum level is
reached, then checks the air pressure is correct and turns on the air flow.
MAN0386-1.0 Scirocco 2000.book Page 3 Friday, March 16, 2007 4:15 PM
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