Operation And Maintenance; Servicing The Door; Handling The Eluent; Manufacturing Eluent - Metrohm 942 Extension Module Vario Manual

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5 Operation and maintenance

5.1

Servicing the door

5.2

Handling the eluent

5.2.1

Manufacturing eluent

942 Extension Module Vario ONE/Deg (2.942.1060)
CAUTION
The door is made of PMMA (poly(methyl methacrylate)). It must never
be cleaned with abrasive media or solvents.
CAUTION
Never hold the instrument by the door when lifting it. Only hold the
instrument by the housing.
Careful handling of the eluent ensures stable analysis results. Keep the fol-
lowing general measures in mind when handling the eluent:
The supply bottle with the eluent must be connected as indicated in
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chapter 3.4, page 17. This is particularly important for eluents with vol-
atile solvents (e.g. acetone).
Avoid condensation in the eluent bottle. Drop formation can change
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the concentration ratio in the eluent.
In the case of very sensitive measurements, we recommend that the
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eluent be stirred constantly with a magnetic stirrer (e. g. the
2.801.0010 with 6.2070.000).
To protect the IC system from foreign particles, we recommend aspirat-
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ing the eluent via an aspiration filter (see chapter 3.4, page 17)
(6.2821.090). This aspiration filter must be replaced as soon as it turns
yellow but at least every 3 months.
Chemicals used for manufacturing eluents must have a purity grade of at
least "p.a.". They may be diluted only by using ultrapure water (resistance
> 18.2 MΩ*cm). (These specifications apply generally for all reagents used
in ion chromatography.)
Newly manufactured eluents always need to be microfiltered (0.45 µm fil-
ter).
5 Operation and maintenance
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