GE AKTA avant User Manual page 257

Step
6
Run and evaluate the test
Follow the instructions described in Section 6.1 General performance test actions, on
page 240 to start, run and automatically evaluate the performance test.
Possible causes of a failed test
The following tables describe possible causes of a failed test. When possible sources of
error have been checked and corrected, repeat the test.
Faulty Gradient Test Result
Cause
Disturbances caused by
air trapped in any of the
pumps
Disturbances caused by
damaged pump piston
seals.
Unstable or incorrect UV
signal, or drifting base
line - faulty UV monitor
Wrong mixer chamber
size or faulty Mixer
ÄKTA avant User Manual 29035184 AE
Action
Prime the buffer inlets and purge System pump A and System pump B. See
Section 5.4.1 Prime buffer inlets and purge system pumps, on page 166.
Action
Make sure to prime the buffer inlets and to purge the
System pumps and the Sample pump before method start.
See Section 5.4.1 Prime buffer inlets and purge system
pumps, on page 166 and Section 5.4.2 Prime sample inlets
and purge Sample Pump, on page 173.
Replace piston seals. See ÄKTA avant Operating
Instructions, Maintenance chapter.
See UV monitor U9-M and UV detector unit, on page 363
Change mixer chamber or replace the Mixer. See Sec-
tion 7.8.2 Replace the Mixer, on page 338.
6 Performance tests
6.6 System test
257