Metrohm 709 IC Pump - Manual (Page 39)

4.3 Faults and malfunctions
709 IC Pump
31
4.3 Faults and malfunctions
If difficulties appear with the IC system during analyses, their causes
are best investigated in the order separating column → 709 IC Pump
→ eluent → 732/733 IC System (see 732/733 Instructions for Use,
section 5.3.2). Several of the malfunctions which may appear with the
709 IC Pump are listed in the following table with details of possible
causes and countermeasures.
Malfunction Cause Rectification
• Dark or undefined
display
• Pump does not
respond to key-
stroke
• Pump drive is
switched on auto-
matically after
switching on the
instrument without
keystroke
• Battery of Zero Power
RAM discharged • Inform Metrohm
service
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 sec-
tion 4.2.2)
• Use pulsation
dampener, use more
powerful pump or
lower the sensitivity
Drift of the baseline • Thermal equilibrium
not yet reached
• Leak in system
• Evaporation of organic
solvent in eluent
• Condition system with
heating switched on
• Check connections
and make leakproof
• Ensure better closure
of eluent supply vessel
Considerable pressure
drop • Leak in system • Check connections
and make leakproof
Considerable pressure
rise • Contamination of the
filter in the 6.2821.000
Filter unit Manufit
• Contamination of the
filter in the 6.2821.100
Filter unit PEEK
• Clean or replace
6.2821.020 Steel
mesh(es)
• Replace 6.2821.110
connector with filter
Error message "E01" in
the display • RS232 receive error • Inform Metrohm
service
Error message "E02" in
the display • ROM test error • Inform Metrohm
service
Error message "E03" or
"E05" in the display • RAM test error • Inform Metrohm
service