page 32 Cleaning procedures
5 Cleaning procedures
Before starting a measurement the sample vessel SV20 and the measuring probes
must be cleaned intensively.
!
The accuracy and reproducibility of the measurements depend on how thoroughly
the cleaning process is performed. Please follow the cleaning instructions provided
in this section.
5.1 Cleaning the sample vessel
The first two cleaning steps should also be carried out before a sample vessel is used
for the first time.
!
Do not use cleaning agents which contain surfactants (soap, rinsing agents) or any
alkaline cleaning agents.
!
Use only pure solvent and clean, lint-free cloths.
5.1.1 Step 1: Cleaning with water
Rinse out the sample vessel under hot flowing water, wiping it alternately with
paper.
Rinse the sample vessel with distilled water.
5.1.2 Step 2: Check cleanliness
Wipe out the sample vessel with moistened tissue paper.
• If there is a squeaking sound when wiping, the sample vessel is clean. Rinse
the sample vessel again with distilled water. Dry the sample vessel in a drying
cabinet.
• If the paper slides on the glass, there are surface-active substances on the
surface of the glass. In this case, carry out more intensive cleaning by
performing the step described below.
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