Hach 2100AN Instrument Manual page 82

SECTION 9,
continued
5.
Press . The
ENTER
display reads seconds
30
and counts toward . After
0
time expires, the display
reads 500 CU (or the last
calibrated value), and the
first digit flashes.
Note: To reestablish the
reference zero point and
make measurements based
on the current calibration,
skip to step 9 -OR- to
calibrate proceed to step 6.
9.
Press .
UNITS/EXIT
6.
Use the edit keys to
change the display to read
the known color units of
the prepared standard.
10.
Carefully pour
250 mL of sample into the
Inlet Reservoir. Read and
record the result.
Note: Signal Average can be
selected on or off (see
Section 3.1.3 on page 34).
Note: Automatic or Manual
Range can be selected (see
Section 3.1.1 on page 33).
Note: A time-date stamp,
measurement record can be
printed or transmitted via
RS232 by pressing the
PRINT key.
7.
Carefully pour 250
mL of the known standard
into the Inlet Reservoir.
Note: Always slowly pour
sample down the inside edge
of the reservoir to minimize
entrapment of air bubbles in
the sample.
82
8.
Press . The
ENTER
display reads 30 seconds,
and counts toward . The
0
edited concentration value
is displayed.
The calibration is complete;
skip to step 10.