The Frac-950 tab

Introduction	The Frac-950 tab is used for defining options for Frac-950. The user can choose rack type and fractionation order.

How to set up fractionation

The table describes how to set up the fractionation.

Step	Action
1	Select rack type from the Rack drop-down list.
2	Select the order for fractionation by using the Fraction order radio buttons.

Manual runs

In System Control, for manual runs, the Frac-950 tab cannot be used. Instead, use the manual fractionation instructions, starting with Man_.

Choose Manual:Frac to open the Frac Instructions dialog box.

Total number of tubes	The total number of tubes sampled may differ if a last tube has been chosen. The Number of tubes equation in the bottom left corner of the Frac-950 dialog box of the Start Protocol shows the current number of available tubes chosen for fractionation, followed by the total possible number in parentheses.

How to select the last tube

You can select a position for the last tube to be used in the fractionation process. If the process attempts to go further than the selected last tube during a method run, an alarm will be executed.

The last tube position can only be selected on the Frac-950 dialog box in the Start Protocol when you start a method run, or when you do an instant run. The illustration below shows an example of this dialog box:

The lower right box within the Last tube field shows the currently selected last tube. The table below describes how to re-define the last tube:

Step	Action
1	In the Frac-950 dialog box, select the Define box in the Last tube field to select the last tube position.
2	Place the cursor over the appropriate tube (circle) within the tube matrix and click again.

Note: When using different sized tubes in the same rack, the last tube can be set for both tube sizes. Use the Tube type drop-down list to choose the desired tube size, and then follow the procedures outlined above to select the last tube.

How to set the last tube to default setting	If you want to return to the default last tube position, click the Reset to default button of the Frac-950 dialog box in the Start Protocol when you start a method run.

2005-06-15