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14.Lift the lid and remove the sample paper. The sample paper may be kept in
one of the resealable bags for further chemical analysis.
15.When all samples have been taken, switch the instrument off by pressing
the red pushbutton twice in quick succession.
16.Close the lid and ensure that the magnetic catch is fully engaged.
4.3 Taking samples using smaller sample papers
If the standard 110 mm diameter High Purity Sample Papers are too large for
the area to be sampled, half size, quarter size or 22 mm wide strip papers can
be used as follows. Care must be taken to ensure that sample papers do not
become contaminated.
1. Put on a pair of clean disposable gloves.
2. Using tweezers, remove an Elcometer 130 SCM400 High Purity Sample
Paper from the pack.
3. Fold paper as follows:-
For half size paper fold standard paper in half and cut into two along fold
line.
For quarter size paper fold standard paper into quarters and cut into
quadrants along fold lines.
For 22 mm wide strip fold standard paper into half and cut 11 mm either
side of fold line.
4. Fill a 2 ml syringe with an appropriate amount of high purity water:-
For a half size paper use 0.8 ml
For a quarter size paper use 0.4 ml
For a 22 mm wide strip use 0.4 ml
5. Holding sample paper in tweezers, eject the correct amount of water onto
its surface. Take care to retain as much water as possible on the paper.
6. Follow Steps 5 to 10 (inclusive) in Section 4.2.
7. Using the central marker on the inner electrode to aid positioning, place the
sample paper over the concentric electrodes as appropriate, ensuring all
entrapped air is removed:
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