Metrohm 833 IC Liquid Handling Unit - Manual (Page 86)

9 Troubleshooting - maintenance
833 IC Liquid Handling Unit / Instructions for Use 8.833.1003
78
Fault Cause Remedy
Suppressor module /
Sample preparation
module do not switch to
next position • Connection to suppressor
module / sample preparation
module interrupted
• Suppressor module/Sample
preparation module dry
• Actuator rotor temporarily
blocked
• Actuator dirty
• Actuator has mechanical fault
• Check cable connection from suppressor
module / sample preparation module to
833 IC Liquid Handling Unit and from 833
IC Liquid Handling Unit to 830 IC Interface
/ 819 IC Detector.
• Rinse all 3 suppressor units with solution
for at least 10 min.
• Switch instrument off and on again.
Activate suppressor with <STEP>. Check
that actuator rotor is in correct position
(see Section 9.2.6.3).
Repeat process 2-3 times, before each
switch to next position with <STEP> wait
at least 10 s.
If the suppressor is blocked again then it
must be cleaned or replaced (see below).
• Clean actuator (see Section 9.2.6.2).
• Replace actuator (see Section 9.2.6.3).
Unsatisfactory yield for
dialysis • Transfer time not determined
correctly
• Dialysis time too short (e.g. at
too low concentration)
• Dry or damaged dialysis
membrane
• Deposits on dialysis
membrane, recognizable by
discoloration at sample inlet
• Unsuitable dialysis membrane
• Check optimal transfer time (see Section
7.6.2).
• Check optimal dialysis time (see Section
7.6.3).
• Replace dialysis membrane
(see Section 9.2.7.1).
• Replace dialysis membrane
(see Section 9.2.7.1).
• Use different dialysis membrane.