Hach DR/700 - Page 610

61-54
NITROGEN, MONOCHLORAMINE, continued
Using AccuVacs
1. Install module
number
61.01
in a DR/700.
Note: The DR/700 must
be calibrated before
sample analysis. See
Calibration following
these steps.
2. Press: I/O
The display will show
610 nm
and module number
61.01
After 2 seconds, the
display will show a
program number, the
concentration units
and the zero prompt.
3. Press the
PROGRAM key once
or twice until the
lower display shows
program number
61.000
If necessary, press the
UP ARROW until the
upper display shows
0.00 mg/l
4. Fill a cell with 10
mL of sample. Cap
the cell. This is the
blank- nothing will be
added to it.
5. Label one 50-mL
beaker "free
ammonia" and
another 50-mL
beaker
"monochloramine".
Note: Free ammonia is
the ammonia and
ammonium in the
sample, corrected for
monochloramine.
6. To test for free
ammonia, add 5
drops of Hypochlorite
Solution into the
beaker labeled free
ammonia.
Note: Occasionally
shake the Hypochlorite
Solution bottle to ensure
proper dispensation.