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3. Contamination
An intimate knowledge of the physical and
chemical attributes of the contaminants
the machine will need to deal with is of
particular importance in choosing the most
appropriate cleaning process and deter-
gents.
Physical and chemical properties of a con-
taminant include, for instance, its solubility
in water in acidic, pH-neutral and alkaline
conditions, the efficacy of hydrolysis or ox-
idation, melting and softening points, its
ability to emulsify as well as a substance’s
suspension or dispersing properties.
4. Disinfection
For certain applications laboratory glass-
ware has to be disinfected. On the one
hand this protects laboratory personnel
who come into contact with bacterial
contamination at work. And on the other,
disinfection prevents bacterial cross-con-
tamination of test samples and instruments
in medical laboratories, hygiene institutes
and pharmaceutical laboratories in the
food and cosmetics industry.
5. Analytical Methods
The results of analyses can be falsified by
contaminants on laboratory glassware.
Knowledge of these factors can help in
selecting the correct cleaning agent.
6. Analytical purity
Each laboratory has its own definition of
“analytical purity”, depending on specifica-
tions and the nature and reproducibility of
test methods. The washer-disinfector, in-
cluding all its accessories and the cleaning
programme used, must be able to achieve
cleaning results that meet the standards
required by the application.
Miele’s systematic approach covers the
following process stages
• Cleaning, disinfection and drying
• Baskets and inserts
• Water treatment
• Detergent recommendations
• Compilation and analysis of cleaning
programmes
• Machine commissioning by Miele Service
• Qualification package: Installation
Qualification (IQ) and Operation
Qualification (OQ)
• Peace-of-mind package including
maintenance and service contracts