Hach 2100N Instruction Manual page 40

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SECTION 3,
continued
5.
The instrument
automatically increments to
the next standard, displays
the expected NTU value
(e.g., 20.00 NTU), and the
S1 annunciator flashes.
Remove the sample cell
from the cell holder.
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6.
Fill a clean sample cell
to the line with well-mixed,
20-NTU formazin standard.
Wipe the sample cell clean,
and apply a thin film of
silicone oil on its surface.
Place it into the cell holder,
and close the cell cover.
Note: If using StablCal
Stabilized Formazin, use the
20-NTU Standard.
7.
Press . The
ENTER
display counts down from 60
to 0, and displays the
turbidity (compensated for
dilution water turbidity).
The instrument
automatically increments to
the next standard, the
display shows
200.0 NTU
and the annunciator
S2
flashes.
Remove the sample cell
from the instrument.
40
8.
Fill a clean sample cell
to the line with well-mixed,
200-NTU formazin
standard.
Repeat steps 6 and 7.
The instrument will display
, and the S3
1000 NTU
annunciator lights. Remove
,
the sample cell from
the instrument.
Note: If using StablCal
Stabilized Formazin, use the
200-NTU Standard.