Metrohm 872 Extension Module IC Pump - Manual (Page 62)

7.1 Problems and their solutions
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872 Extension Module IC Pump
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 51).
Drift of the baseline Eluent – Evaporation of the
organic solvent in the elu-
ent. Check the eluent bottle attachment (see Figure
16, page 26).
Very noisy baseline High pressure pump – con-
taminated pump valves. Clean pump valves (see Chapter 6.4.2, page
41).
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
41).
Pulsation damper not con-
nected. Connect pulsation damper (see Chapter 4.8,
page 35).
Background conduc-
tivity too high Incorrect eluent. Change eluent (see Chapter 6.3.2.3, page 40).
Poor reproducibility
of the retention
times Eluent – Leak in the eluent
path. Check the eluent path.
Eluent – Blockage in the
eluent path. Check the eluent path.
Unexpected change
to the retention
times in the chroma-
tograms Eluent – Gas bubbles in the
eluent. Check connections of the eluent degasser (see
Chapter 4.5, page 28).
High pressure pump –
defective. Request Metrohm Service.
Vacuum is not being
built Eluent Degasser – Connec-
tor Vacuum on the rear of
the instrument not (tightly)
sealed. ￭ Seal the connector Vacuum tightly with a
6.144.6040 threaded stopper.
or when using an 872 Extension Module: