41
SECTION 3, continued
3.2.3 Matching Multiple Sample Cells
Precise measurements of very low turbidity samples require the cells be
optically matched or a single cell be used for all measurements. If more
than one cell is used, follow this procedure to match (index) the cells:
1. Clean and oil
the sample cells
as instructed in
Section 3.1.1 on page 35.
2. Fill the clean sample
cells to the line with the
same sample.
3. Press: I/O to turn the
instrument on.
4. Insert the first
sample cell into the
sample compartment and
close the cover.
5. Press: READ
Record the cell position
in the compartment and
the displayed reading.
Place an orientation mark
on the cell marking band.
Note: This procedure may be
easier if the user holds the
READ key through the whole
process. This allows the lamp
to remain on and make con-
tinuous readings.
6. Insert the second
sample cell into the cell
compartment and close
the cover.
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