GE AKTA avant User Manual page 375

Problem
Incorrect or unstable
reading
pH monitor and pH valve
Problem
The pH module is not
found by the instru-
ment
ÄKTA avant User Manual 29035184 AE
Possible cause and action
The temperature compensation factor is not prop-
•
erly set
Use a temperature compensation factor. The temper-
ature compensation factor is found in System Con-
trol:System Settings:Conductivity. Instruction regard-
ing the factor is also found in Section 7.7.3 Calibrate
the Conductivity Monitor, on page 327.
The column is not equilibrated
•
Equilibrate the column. Use the method phase Equili-
bration.
If necessary, clean the column. Use the predefined
method Column CIP. See Section 7.6.3 Perform Column
CIP, on page 297.
Poor mixing function
•
Check that the correct Mixer chamber size is used.
See Select Mixer chamber, on page 157 for recommen-
dations. To change the Mixer, see Section 7.8.2 Replace
the Mixer, on page 338.
Check the motor operation of the mixer. Place a
magnet close to the Mixer chamber during run. The
magnet should vibrate.
Check that the Mixer chamber is free from solids. To
open the Mixer, see Section 7.3.2 Replace the inline fil-
ter, on page 275.
Possible cause and action
The cable between the pH valve and the ICU is not
•
connected
Remove the pH valve and make sure that the cable is
connected. See Section 7.8.10 Replace a valve module,
on page 354
8 Troubleshooting
8.3 Troubleshooting: Monitors
375