Metrohm 793 IC Sample Preparation Module - Manual (Page 32)

4 Malfunctions - Maintenance
793 IC Sample Prep Module/ 8.793.1003 Instructions for Use
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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 o
o o o pump o o o o eluent
o o o o 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 793 Sample
Prep Module.
Malfunction Cause Rectification
Insufficient or non-
existing flow rate x Contact pressure too low
x Pump tubing faulty
x Contamination of the filter in the
6.2821.100 Filter unit PEEK
x Blocked connections
x SP Module A blocked
x Set contact pressure correctly: Press
contact pressure lever 5555 on the tubing
cartridge down as far as it will go. Press
contact pressure lever 5555 upwards until the
solution just starts to be drawn in. Then
press contact pressure lever upwards until
it clicks once more to obtain optimal
contact pressure.
x Exchange pump tubing
(see section 4.2.4)
x Replace the 6.2821.110 Filter (see
connections description, section 2.3.2)
x Carry out a step-by-step check of the
connections and connectors and if nec-
essary clean or replace them. If the
connections to or from the actuator are
blocked then remove the actuator and
clean it (see section 4.2.6).
x Exchange SP Module A
(see section 4.2.7).
Leakage x Leaking tubing connectors x Tighten or replace the leaking tubing
connectors.
Air bubbles in pump
circuit x Suction tubing is not immersed
x Leaking tubing connectors
x Immerse the suction tubing fully in the
regenerating or rinsing solution.
x Tighten or replace the leaking tubing
connectors.