GE AKTApure User Manual page 370

8 Troubleshooting
8.3 Troubleshooting: Monitors
Problem
Incorrect or unstable read-
ing
pH monitor and pH valve
Problem
The pH module is not found
by the instrument
The internal valve tempera-
ture is too high
370
Possible cause and action
• The temperature compensation factor is not properly set
Use a temperature compensation factor. The temperature com-
pensation factor is found in System Control:System Settings:Con-
ductivity. Instruction regarding the factor is also found in Sec-
tion 7.7.3 Calibrate the Conductivity monitor, on page 308.
• The column is not equilibrated
Equilibrate the column. Use the method phase Equilibration.
If necessary, clean the column. Use the predefined method Col-
umn CIP. See Section 7.6.3 Perform Column CIP, on page 284.
• Poor mixing function
Check that the correct Mixer chamber size is used. See Select
Mixer chamber, on page 152 for recommendations. To change the
Mixer, see Section 7.8.3 Replace the Mixer, on page 322.
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 filter, on page 266.
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 Hardware installation of a module, on page 77.
• The air intake on the rear or on the left side of the instrument
is covered
Make sure that none of the air intakes on the instrument are
covered.
• Hot surroundings
Decrease the room temperature. Maximum operating tempera-
ture is 35°C.
• Hardware error
Switch off the instrument and wait until the temperature has
decreased. Restart the instrument. If this error is recurrent, gen-
erate a System error report and contact Service.
ÄKTA pure User Manual 29119969 AB