Metrohm 850 Professional IC Anion MSM-HC MCS LP-Gradient - Manual (Page 120)

6.1 Problems and their solutions
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850 Professional IC–Anion – MSM-HC – MCS – LP Gradient
Problem Cause Remedy
MCS – vacuum pump
defective. Contact the Metrohm Service.
Background conduc-
tivity too high MSM-HC – not connected. Connecting the MSM-HC (see Chapter 3.18,
page 55).
MCS – not connected. Connect the MCS.
Incorrect eluent. Change eluent (see Chapter 5.4.2.3, page 80).
MSM-HC – regeneration or
rinsing solution flow prob-
lems. Check the flow of the regeneration and rinsing
solution (see Chapter 3.18.2, page 55).
Data of the separa-
tion column cannot
be read. Column chip contamina-
ted. Clean contact surfaces of the column chip
(with alcohol).
Column chip defective. 1. Save column configuration in MagIC Net.
2. Notify Metrohm Service.
Individual peaks
greater than
expected Sample – Carry-over of the
samples from previous
measurement. Rinse system longer between two samples.
MSM-HC – No (or
insufficient) pump-
ing of regeneration
or rinsing solution Leak in the system. Check connections.
Peristaltic pump – contact
pressure too weak. Correctly set contact pressure .
Peristaltic pump – filter
blocked . Replace the filter .
MSM-HC – backpressure
too high. Clean the MSM-HC (see Chapter 5.11.3.2,
page 97) or replace parts (see Chapter
5.11.3.3, page 100).
Peristaltic pump – pump
tubing defective. Replace pump tubing .
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.
Chromatograms
have poor resolution Separation column –
diminished separating effi-
ciency. ￭ Regenerate separation column (see Chap-
ter 5.15.4, page 106).