For a fraction collector cluster (FCC), click the down-arrow and select to purge either a single fraction collector or all fraction collectors in the cluster.
| Purge time per channel | Enter a purge time in seconds. | 
| Purge from channel .. to .. | Enter the range of channels to purge. | 
| The purge procedure requires that your pump delivers a flow. Ensure that your pump is switched on and that a flow is specified before starting the purge procedure. | 
The purge starts as soon as you leave the dialog box with .