Hach DR/700 Procedures Manual page 376

CHLORINE, FREE,
USING ACCUVAC AMPULS
1.
Install module
52.01
in a DR/700.
Note: Samples must be
analyzed immediately
and cannot be preserved
for later analysis.
4.
Fill a cell with 10
mL of sample (the
blank). Cap. Collect
at least 40 mL of
sample in a 50-mL
beaker.
Note: In bright light it
may be necessary to
close the cell
compartment cover.
continued
2.
Press:
I/O
The display will show
525 nm
and module number
52.01
5.
Place the blank in
the cell holder.
Note: In bright light it
may be necessary to
close the cell
compartment cover.
52-50
3.
After 2 seconds,
the display will show
a program number,
concentration units,
and the zero prompt.
If necessary, press the
key until
UP ARROW
the lower display
shows program
number
52.06.1
6.
Press:
ZERO
The display will
count down to 0.
Then the display will
show 0.00 mg/L and
the zero prompt will
turn off.