User Manual

4.1 Malfunctions and their rectification
753 Suppressor Module / 8.753.1003 Instructions for Use
25
4 Malfunctions – Maintenance
4.1 Malfunctions and their rectification
If difficulties appear with the IC system during analysis, their cause are
best investigated in the order separating column pump eluent
IC system. An overview of possible malfunctions, their causes and
remedies can be found in the instruction manuals of both 690 Ion
Chromatograph (section 6.5) and 732/733 IC System (section 5.3.2).
In addition to these general malfunctions the table below contains oth-
ers which might arise as a result of the operation of the 753 Suppressor
Module.
Malfunction Cause Rectification
Insufficient or non-
existing flow rate
Contact pressure too low
Pump tubing faulty
Blocked connections
Suppressor blocked
Set contact pressure correctly: Press
contact pressure lever 55 on the tubing
cartridge down as far as it will go. Press
contact pressure lever 55 upwards until
the solution just starts to be drawn in.
Then press contact pressure lever up-
wards until it clicks once more to obtain
optimal contact pressure.
Exchange pump tubing
(see section 4.2.4)
Carry out a step-by-step check of the
connections and connectors and if nec-
essary clean or replace them. If the con-
nections to or from the suppressor are
blocked then remove the suppressor and
clean it (see section 4.2.6).
Exchange suppressor
(see section 4.2.7).
Leakage Leaking tubing connectors Tighten or replace the leaking tubing
connectors.
Air bubbles in pump
circuit
Suction tubing is not immersed
Leaking tubing connectors
Immerse the suction tubing fully in the
regenerating or rinsing solution.
Tighten or replace the leaking tubing
connectors.
Reduced phosphate
sensitivity and/or strong
rise in baseline
Reduction of the suppressor
capacity by loading with heavy
metals or organic contamina-
tions
Regenerate suppressor (see section
4.2.5) or exchange suppressor (see sec-
tion 4.2.7).