Metrohm 850 Professional IC MSM-HC MCS Prep 3 - Manual (Page 55)

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3 Installation
850 Professional IC Anion – MSM-HC – MCS – Prep 3
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3.13 Sample degasser
The sample degasser removes gas bubbles and disolved gases from the
sample. For degassing, the sample flows into a vacuum chamber through
a special fluoropolymer capillary.
Gas bubbles in the sample lead to poor reproducibility, as the quantity of
sample in the sample loop would not always be the same. Samples (con-
taining gas) should therefore be degassed before injection. For this the
sample is sucked through a degasser chamber before injection, whereby
any gas bubbles are automatically removed.
Note
When using the sample degasser, the rinsing time extends by at least 2
minutes.
1
2
3 4
Figure 23 Sample degasser
1 Sample degasser input 2 Sample degasser output
3 PEEK pressure screw, long 6.2744.090 4 Connection capillaries 6.1803.040
Connecting the sample degasser
1 Remove and keep 6.2744.220 thread stoppers from the input and
output of the sample degasser.
2 Connect the end of the 6.1803.040 sample aspirating capillary con-
nected to the injection valve with a long PEEK pressure screw (23-3)
to the output of the sample degasser (23-2).
3 Connect 6.1803.040 connection capillary with a long PEEK pressure
screw (23-3) to the input of the sample degasser (23-1).