Metrohm 940 Professional IC Vario ONE/HPG - Manual (Page 81)

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6 Troubleshooting
940 Professional IC Vario ONE/HPG (2.940.1140)
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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 51).
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 53).
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 53).
The pulsation absorber is
not connected or is defec-
tive. Connect (see Chapter 3.11, page 27) or
replace the pulsation absorber.
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. ￭ Check the eluent bottle cap (see Chapter
3.7, page 22).
￭ 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) .
Guard column – Blocked. Replace the guard column (see Chapter 3.19,
page 38).
Separation column –
Blocked. ￭ Regenerate the separation column (see
Chapter 5.14.4, page 71).
￭ Replace the separation column (see "Con-
necting the separation column", page 42).
Note: Samples should always be microfiltered .