Metrohm 881 Compact IC pro – Anion – MCS - Manual (Page 110)

6.1 Problems and their solutions
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100 ￭￭￭￭￭￭￭￭
881 Compact IC pro – Anion – MCS
Problem Cause Remedy
Separation column – dead
volume at column head. ￭ Install the separation column in reverse
flow direction (if permitted by the leaflet)
and rinse into a beaker.
￭ Replace separation column (see "Connect-
ing and rinsing the separation column",
page 61).
Greater rise in the
baseline Suppressor – reduced
capacity. Regenerate the suppressor (see Chapter
5.12.3.2, page 88).
Precision problems -
significant scatter-
ing of the measured
values Sample – gas bubbles in
the sample. Use sample degasser (see Chapter 3.13, page
37).
Injection valve – sample
loop. Check installation of the sample loop (see
Chapter 3.14.1, page 39).
Sample – rinsing volume
too low. Increase rinsing time (see Chapter 5.9, page
83).
Injection valve – defective. Request Metrohm Service.
MCS – vacuum too low. ￭ Check connectors. If they are ok:
￭ Contact the Metrohm Service.
Unexpected change
to the retention
times in the chroma-
tograms Separation column –
diminished separating effi-
ciency. ￭ Regenerate separation column (see Chap-
ter 5.14.4, page 95).
￭ Replace separation column (see "Connect-
ing and rinsing the separation column",
page 61).
Eluent – Gas bubbles in the
eluent. Check connections of the eluent degasser (see
Chapter 3.9, page 29).
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
6.1446.040 threaded stopper.