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SECTION 2,
continued
2.4 Nephelometric Measurement Procedure
1.
Collect a representative
sample in a clean container.
Fill the sample cell to the
line (approximately 30 mL).
Take care to handle the
sample cell by the top. Cap
the sample cell.
Note: Instrument warm-up is
not required. Optical and
electronic stabilization
is instantaneous.
5.
Select manual or
automatic range by pressing
the
key.
RANGE
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2.
Hold the sample cell by
the cap, and wipe to remove
water spots and finger prints.
6.
Select the appropriate
signal averaging setting (on
or off) by pressing the
key.
SIGNAL AVG
Note: See 3.1.3 for more
information.
3.
Apply a thin bead of
silicone oil from the top to
bottom of the cell—just
enough to coat the cell with
a thin layer of oil. Using the
oiling cloth provided, spread
the oil uniformly. Then,
wipe off the excess. The cell
should appear nearly dry
with little or no visible oil.
See Section 2.6.1.
7.
Select the appropriate
Ratio setting (on or off) by
pressing the
key.
RATIO
Select the appropriate unit
(FNU or NTU) by pressing
the
key.
UNITS
Note: Values >40 NTU require
Ratio on.
21
4.
Make sure the filter is in
place. Place the sample cell
in the instrument cell
compartment and close
the lid.
Note: For immediate update of
the display, press
.
ENTER
Note: When using the Flow-Cell
System, the Flow-Cell cover
must be in place for the LED
light source to function.
8.
Read and record
the results.
Note: A measurement record
can be printed or transmitted
via RS232 by pressing the
key.
PRINT
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