Metrohm 833 IC Liquid Handling Unit - Manual (Page 85)

9.1 Faults and their remedies
833 IC Liquid Handling Unit / Instructions for Use 8.833.1003
77
Fault Cause Remedy
Inadequate or no supply
at all from pump Dialysis cell
• Dialysis cell inlets blocked
• Sample tubing blocked by too
large particles
• Bacterial growth in sample
channel and dialysis cell
• Narrowed PTFE tubing by
compression fittings tightened
too much
Filtration cell
• Filter membrane blocked,
filtration cell inlets blocked
• Narrowed PTFE tubing by
compression fittings tightened
too much
• Replace dialysis membrane and clean
the cell (see Section 9.2.7.1).
• Replace blocked tubing, always
centrifuge sample (see Section 9.2.4).
• Replace tubing16, 57 und 58 for sample
channel regularly, replace dialysis
membrane
• Use capillary cutter to cut off narrowed
tubing ends or replace tubing.
• Replace filter membrane and clean the
cell (see Section 9.2.8.1).
• Use capillary cutter to cut off narrowed
tubing ends or replace tubing.
Leaks • Tubing nipple leaks • Tighten up or replace tubing nipples.
Air bubbles in pump
circulation system • Aspiration tubing not immersed
• Tubing nipple leaks
Dialysis cell
• Acceptor not properly
degassed
• Standing air bubbles
• Completely immerse aspiration tubing.
• Tighten up or replace tubing nipples.
Dialysis cell
• Degas acceptor solution again.
• Small air bubbles do not interfere. For
larger air bubbles rinse the sample
channel with degassed acceptor solution
(possibly open outlet briefly).
Reduced phosphate
sensitivity and/or large
baseline increase
(suppressor) • Suppressor capacity reduced
by heavy metal load or organic
contaminants • Regenerate suppressor (see Section
9.2.6.1) or replace it (see Section 9.2.6.3).
Suppressor module /
Sample preparation
module switches to next
position, but does not
work properly • Suppressor module/Sample
preparation module dry
• Actuator rotor temporarily in
wrong position
• Actuator step not set correctly
• Rinse all 3 actuator 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 necessary set actuator step again (see
below).
• Readjust actuator step
(see Section 9.2.6.3).