Beckman Coulter Multisizer 4, User Manual

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PN A51387A
B
4-11
Selecting Analysis Settings: SOM and SOP
Using a Standard Operating Method (SOM)
4
• Select Parked out of beaker to position the stirrer outside the beaker during the run.
• Select Manual to set the angle of the stirrer when you are using a beaker not manufactured
by Beckman Coulter. The Manual radio button is available only if you have selected Other
and entered a non-standard beaker size in the Sample Beaker pane.
• In the Manual field, enter the stirrer position in degrees (from -20 to 10) or select an angle
from the drop-down list. Zero (0) degrees is vertical, and the stirrer will touch the aperture
tube at approximately 10 degrees. A negative position is farther from the aperture tube and
is useful for larger, non-standard beakers.
3. Select Disable instrument keypad during run if you would like to prevent the operator from
using buttons on the Analyzer Control Panel to change the speed or direction of the stirrer, or
turn the stirrer on or off (see
Control Panel
, page 1-5 ). This option is not available if you select
Parked out of beaker.
4. Select Use Stirrer to run an analysis with the stirrer positioned inside the beaker and rotating
at the speed you select. This checkbox is available only if you select Automatic or Manual in the
Stirrer Position pane.
5. In the Speed field, enter the stirrer rotation speed as any integer between 1 and 60, or select the
speed from the drop-down list.
To find the appropriate speed for your beaker size and electrolyte combination, position the
stirrer and adjust the stirrer speed using the Speed (+ and -) buttons on the Analyzer Control
Panel. In the Edit SOM / Stirrer Settings window (see
Editing SOM Settings , page 4-23 ), the Speed
field will automatically display the number corresponding to the actual stirrer speed.
6. Select CW (clockwise) or CCW (counterclockwise) to determine stirrer direction. For
information on choosing stirrer direction, see
Stirrer Direction Controls
, page 1-6 .
Before you raise the platform, the Analyzer will automatically position the stirrer at the correct
angle. If you need to change the stirrer position, lower the platform and enter the correct settings
in the Edit SOM / Stirrer Settings window. To set a specific angle for the stirrer position, select Other
and enter the angle in the Manual field in the Stirrer Position pane.
NOTE
After you save stirrer settings, it is not possible to reposition the stirrer using the SOM Wizard. To
reposition the stirrer, or to adjust stirrer speed using buttons on the Analyzer Control Panel, use the
Edit SOM / Stirrer Settings window (see
Editing SOM Settings
, page 4-23 ).
Copying Manual Stirrer Settings
The Edit the SOM / Stirrer tab includes an additional feature that allows you to copy manual stirrer
settings into the SOM.
NOTE
The Multisizer 4 software allows the operator to position the stirrer manually only when the
operator has entered a non-standard beaker size.