GE AKTAprocess, Operating Instructions Manual

Page: 160 / 180

Possible cause/corrective action Problem Component
In the case of pump damage an error text Pump
diaphragm damage will be displayed on the screen.
To determine which pump head diaphragm is damaged,
perform the following actions: Pump damage Pump
1
Disable the interlock in UNICORN by acknowledging
the Alarm and then press Continue.
2
Increase the flow rate until the system pressure
reaches 1.5 bar (pressure sensor PT-111).
Result: A LED indicator will light up on the pump
head with the damaged diaphragm.
Refer to the pump manual in the product documenta-
tion package for replacement instructions. However, it
is recommended that you contact your service repre-
sentative from GE Healthcare for pump maintenance.
Note:
The alarm for the pump diaphragms (Pump_Alarm) may
be enabled or disabled in UNICORN.
The actual flow rate may deviate from the set flow rate
if the running conditions change, such as for example
pressure, ambient temperature or air content in the
solutions. It can also deviate if there is a build-up of dirt
in the flow meter. Other reasons for unintended flow
are siphoning through the system or too high inlet
pressure. The actual flow rate devi-
ates from the displayed
flow rate
or
a flow rate is displayed
when the pumps are off
Flow meter
If this occurs, a zero-point adjustment of the flow meter
should be performed, see Maintenance annually or as
needed, on page 131.
UV curve
The table below describes error symptoms that may occur with UV measurements, to-
gether with possible corrective actions.
Corrective action Possible cause Error symptom
Clean the system Dirt or residues in the flow
path from previous runs Ghost peak
Clean the column according to the
column instructions Residues in the column from
previous runs
160 ÄKTAprocess Operating Instructions 29-0252-49 AA
7 Troubleshooting