Matching sample cells
To decrease the effects that optical differences among sample cells can have on turbidity
, transmittance or absorbance measurements, measure
samples in matched sample cells. It may not be possible to match all sample cells due to the differences in glass.
1. Rinse two or more
clean, empty sample
cells two times with
dilution water and drain
to waste. Fill the
sample cells to the line
(about 30 mL) with
filtered dilution water
and immediately put the
cap on the sample cell.
Refer to Prepare
dilution water
on page
23.
Let the sample cell sit
for at least five minutes
to degas.
2. Clean the sample
cells with a soft, lint-free
cloth to remove water
spots and fingerprints.
Do not invert the
sample cell.
3. Apply a small bead
of silicone oil from the
top to the bottom of the
sample cells.
4. Use the oiling cloth
provided to apply the oil
equally to the surface of
the sample cells.
Remove the excess oil.
Make sure that the
sample cells are almost
dry.
5. Put the first sample
cell in the sample cell
holder. Close the cover.
Record the value when
stable.
6. Remove the sample
cell, turn it about
1
/
8
of a
turn and put it in the
sample cell holder
again. Close the cover.
Record the value when
stable.
English 21
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