Metrohm 807 Dosing Unit - Manual (Page 43)

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4 Handling and maintenance
807 Dosing Unit
￭￭￭￭￭￭￭￭ 35
4.1.4.2 PETG housing
In contrast to the other components of the dosing unit, the transparent
housing has only limited resistance to chemicals.
Good resistance Aqueous solutions, diluted acids, alcohols and
hydrocarbons
Limited resistance Concentrated organic acids, diluted aqueous
alkalis (cold cracking), acetone, isopropanol, tet-
rahydrofuran, hot water
Non-resistant Concentrated inorganic acids and bases, bro-
mine, chlorinated solvents, phenol, water vapor
>100°C
The PETG housing is not dishwasher-safe, but it can be cleaned readily
with lukewarm water and a dishwashing detergent.
4.1.4.3 Materials
Housing PETG (polyethylene terephthalate, glycol-modi-
fied) or PVDF
Centering tube PETG or PVDF
Dosing piston PTFE (polytetrafluoroethylene)
Dosing cylinder Borosilicate 3.3 or ETFE
Valve disc Silicone carbide ceramic
Distributor disc Al
2
O
3
ceramic
Distributor chan-
nels ETFE
4.2 Quality Management and validation with Metrohm
Quality Management
Metrohm offers you comprehensive support in implementing quality man-
agement measures for instruments and software. Further information on
this can be found in the brochure «Quality Management with
Metrohm» available from your local Metrohm agent.
Validation
Please contact your local Metrohm agent for support in validating instru-
ments and software. Here you can also obtain validation documentation
to provide help for carrying out the Installation Qualification (IQ) and
the Operational Qualification (OQ). IQ and OQ are also offered as a
service by the Metrohm agents. In addition, various application bulletins