Metrohm 833 IC Liquid Handling Unit User 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
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
at least 10 s.
If necessary set actuator step again (see
below).
•
Readjust actuator step
(see Section 9.2.6.3).