Metrohm 818 IC Pump - Manual (Page 36)

4 Notes – Maintenance – Faults
818 IC Pump / 8.818.1023 Instructions for Use
30
4.3 Faults and malfunctions
If difficulties appear with the IC system during analyses, their causes
are best investigated in the order separating column → 818 IC Pump
→ eluent → 819/820 IC System (see 819/820 Instructions for Use,
section Faults and malfunctions). Several of the malfunctions which may
appear with the 818 IC Pump are listed in the following table with details
of possible causes and countermeasures.
Malfunction Cause Rectification
Baseline with high
noise level, pulsation • Contaminated pump
values
• Faulty piston seals
• Quality of the pump
does not suffice for the
selected sensitivity
• Clean the valves (see
section 4.2.2)
• Replace the piston
seals (see
section 4.2.2)
• Use pulsation
dampener, use more
powerful pump or
lower the sensitivity
Drift of baseline • Thermal equilibrium
not yet reached
• Leak in system
• Evaporation of organic
solvent in eluent
• Condition system with
820 heating switched
on
• Check connections
and make leakproof
• Ensure better closure
of eluent supply
vessel, stir
Considerable pressure
drop • Leak in System • Check connections
and make leakproof
Considerable pressure
rise
• Contamination of the
filter in the 6.2821.100
Filter unit PEEK • Replace 6.2821.130
connector with filter
Pump is not recognized
in «IC Net» • No RS connection • Switch instrument on.
• Check wiring.
• Check that the
connection specified in
the 818 IC Pump
window (see section
3.3 Links) matches
the actual wiring