Metrohm 872 Extension Module - Manual (Page 66)

7.1 Problems and their solutions
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872 Extension Module IC Module
7 Troubleshooting
7.1 Problems and their solutions
Problem Cause Remedy
Marked rise in pres-
sure 6.2821.120 inline filter
blocked. Replace 6.2821.130 filter (see Chapter 6.5,
page 53).
Injection valve – valve
blocked. Have the valve cleaned (by Metrohm service
technicians).
Drift of the baseline Eluent – Evaporation of the
organic solvent in the elu-
ent. Check the eluent bottle attachment (see Figure
14, page 25).
Peak areas lower
than expected Sample – leak in the sam-
ple path. Check the sample path.
Sample – blockage in the
sample path. Check the sample path.
Sample – sample loop not
(completely) filled. Prolong the sample transfer time.
Very noisy baseline High pressure pump – con-
taminated pump valves. Clean pump valves (see Chapter 6.4.2, page
43).
Eluent – Leak in the eluent
path. Check the eluent path
Eluent – Blockage in the
eluent path. Check the eluent path
High pressure pump –
defective piston seals. Replace piston seals (see Chapter 6.4.2, page
43).
Pulsation damper not con-
nected. Connect pulsation damper (see Chapter 4.8,
page 34).
Background conduc-
tivity too high Incorrect eluent. Change eluent (see Chapter 6.3.2.3, page 42).
Individual peaks
greater than expec-
ted Sample – carry-over of the
samples from previous
measurement. Rinse system longer between two samples.
Poor reproducibility
of the retention
times Eluent – Leak in the eluent
path. Check the eluent path