Metrohm 850 Professional IC Anion MSM-HC - LP-Gradient User Manual
Page 110

6.1 Problems and their solutions
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850 Professional IC Anion MSM-HC LP Gradient
Problem
Cause
Remedy
Precision problems -
significant scatter-
ing of the measured
values
Sample – Gas bubbles in
the sample.
Use sample degasser (see Chapter 3.15, page
45).
Injection valve – sample
loop.
Check installation of the sample loop (see
Chapter 3.16.1, page 47).
Sample – Rinsing volume
too low.
Prolong the rinsing time (see Chapter 5.8,
page 83).
Injection valve – defective.
Request Metrohm Service.
Unexpected change
to the retention
times in the chroma-
tograms
Separation column –
diminished separating effi-
ciency.
■
Regenerate separation column (see Chap-
ter 5.13.4, page 95).
■
Replace separation column (see "Connect-
ing and rinsing the separation column",
page 63).
Eluent – Gas bubbles in the
eluent.
Check connections of the eluent degasser (see
Chapter 3.10, page 33).
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:
■
Connect an FEP tubing between the IC
instrument and the Extension Module and
tighten both clamping screws until they
seal.