Download ÄKTAxpress

Maintenance
8.2.1
8
Checking flow restrictor
Maintenance inter- Every month.
val
Reason for maintenance
A flow restrictor opening at too high pressure will cause a high pressure alarm
from the system. In exceptional cases this can result in column rupture.
A flow restrictor opening at too low pressure might cause air bubbles in the
buffer/solution in the flow path.
The position of the flow restrictor:
In addition, a flow restrictor is integrated in the mixer.
Checking flow re- To check the flow restrictor:
strictor
Step
Action
1
Immerse inlet tubing A1 into deionized water.
2
Start a flow from A1 to injection valve waste by:
• Start UNICORN and select System Control: Manual: Flowpath.
• Select Injection Valve and Waste. Click Execute.
• Select System Control:Manual:Pump.
• Select a flow rate of 5 ml/min. Click Execute.
3
Start a flow from A1 to outlet valve waste by:
• Select System Control: Manual: Flowpath.
• Select Injection Valve and Inject. Click Execute.
• p 223