Hach 2100N Instruction Manual page 41

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SECTION 3,
continued
9.
Fill a clean sample cell
to the line with well-mixed,
1000-NTU Formazin
standard.
Repeat steps 6 and 7.
The instrument will display
, and the
1000 NTU S4
annunciator lights. Remove
the sample cell from
the instrument.
Note: If using StablCal
stabilized formazin, use the
1000 NTU standard.
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10.
Fill a clean sample cell
to the line with well-mixed,
4000-NTU Formazin
standard.
Repeat steps 6 and 7.
The display automatically
increments back to the
dilution water standard. The
annunciator lights, and
S0
the previously measured
value of the dilution water is
displayed.
Note: If using StablCal
stabilized formazin, use the
4000 NTU standard.
11.
Press the key. The
CAL
instrument stores the new
calibration and returns the
instrument to the
measurement mode.
Note: If power is lost
during calibration,
new calibration data is lost,
and the old calibration remains
in effect. To exit calibration
without saving new values,
press the UNITS/EXIT key.
Note: If error message E1 or
E2 appear in the display, an
error occurred during calibration
(refer to Table 5 on page 69).
You may clear the error
message and proceed with
measurements by pressing the
ENTER key. However, the
Cal?
annunciator is lighted indicating
a questionable calibration. The
annunciator is turned off
Cal?
only by recalibration, which
removes erroneous data.
Prepare new standards, and
recalibrate the instrument.
Make sure the Formazin
standards are fresh and well
mixed. Also check to ensure
dilution water is < 0.5 NTU.
41