Modifying Conditions While Running 197
11.4 Modifying Conditions While Running
This section describes how to modify conditions during a run, including:
• Changing parameters
• Holding conditions constant
• Stopping flow
• Modifying gradient and event tables
• Switching to another table
• Aborting the run
Note: If the keyboard is locked, unlock it by pressing the Unlock Keyboard screen key on
the Pump Setup screen (see Section 8.2.3, Exiting the Pump Setup Screen).
11.4.1 Changing Parameters
You can change the following parameters during a run:
•Sparge rate
• Event switch status (On/Off)
To change a parameter on the Operate Gradient screen:
1. Move the cursor to the appropriate parameter field on the screen.
2. Type the new value. Press Enter.
When you manually enter a change, the new value remains in effect until the next timed
program change. You can change the parameter only if the keyboard is unlocked.
11.4.2 Holding Conditions Constant
The Hold function keeps the eluent flow rate and composition constant during a run,
which is a useful feature in methods development. The system suspends the run time and
external events while this function is in effect.
To suspend system operation at the current conditions:
1. Press the Hold screen key. The system displays the Hold key in reverse video and
changes the Start Run screen key to Resume Run.
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