Hach-Lange 2100 AN Laboratory Turbidimeter User Manual - Manual (Page 24)

7. Repeat step 6 until
the lowest value is
shown on the display. 8. Record the value.
Put an orientation mark
on the marking band
near the top of the
sample cell. 9. Put the second
sample cell in the
sample cell holder.
Close the cover.
Record the value when
stable. 10. 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.
11. Repeat step
10 until the value
matches the first
sample cell value within
±0.005 NTU.
Note: Match sample
cells to within
±0.002 absorbance
units when indexing
sample cells in the
Absorbance mode for
use with transmittance
or absorbance
measurements. 12. Put an orientation
mark on the marking
band near the top of the
sample cell where the
lowest value is shown.
13. Do steps 9–
12 again as necessary
to match the other
sample cells prepared
in steps 1–4.
22 English