6 troubleshooting, 7 technical specifications – Metrohm 940 Professional IC Vario TWO/SeS/PP User Manual
Page 101
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6 Troubleshooting
940 Professional IC Vario TWO/SeS (2.940.2400)
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93
6 Troubleshooting
Problem
Cause
Remedy
Marked drop in
pressure.
Leak in the system.
Check all capillary connections and seal leaks,
if necessary (see Chapter 3.2, page 14).
The baseline has a
large amount of
noise.
The eluent is not suffi-
ciently degassed.
Ensure that the connectors for the eluent
degasser are firmly connected (see Chapter
5.6, page 62).
The eluent path has a leak.
Check the eluent path and fix the leak.
High-pressure pump – Con-
taminated pump valves.
Clean pump valves (see Chapter 5.8, page 64).
The eluent path is blocked.
Check the eluent path and fix the blockage.
High-pressure pump –
Defective piston seals.
Replace the piston seals (see Chapter 5.8,
page 64).
MCS – The
CO
2
adsorber cartridge is
depleted.
Replace the CO
2
adsorber cartridge (see Chap-
The pulsation absorber is
not connected or is defec-
tive.
Connect (see Chapter 3.11, page 27) or
replace the pulsation absorber.
MCS – The vacuum pump is
defective.
Contact Metrohm Service.
The baseline is drift-
ing.
Thermal equilibrium is not
yet attained.
Condition the instrument with the column
thermostat enabled until the baseline is stable .
Leak in the system.
Check all capillary connections and seal leaks,
if necessary (see Chapter 3.2, page 14).
The organic solvent in the
eluent is evaporating.
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Check the eluent bottle cap (see Chapter
3.7, page 22).
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Constantly stir the eluent.
The pressure in the
system markedly
increases.
The inline filter
(6.2821.120) is blocked.
Replace the filter (6.2821.130) .
Suppressor blocked.
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