Hach DR/700 Procedures Manual page 633

OZONE
(0 to 0.25 mg/L O
For water
Indigo Method (Using AccuVac Ampuls)
1.
Install module
61.01
in a DR/700.
Note: Samples must be
analyzed immediately
and cannot be preserved
for later analysis.
OR
Press the
UP ARROW
key until the display
shows
61.11.1
for mid range
(0-0.75 mg/L).
, 0 to 0.75 mg/L O
3
2.
Press:
I/O
The display will show
610 nm
and module number
61.01
OR
Press the
UP ARROW
key until the display
shows
61.09.1
for high range
(0-1.50 mg/L).
61-77
Method 8311
or 0 to 1.50 mg/L O
3
3.
After 2 seconds,
the display will show
a program number,
the concentration
units and the zero
prompt. If necessary,
press the
UP ARROW
key until the display
shows
61.10.1
for low range
(0-0.25 mg/L).
4.
Gently collect at
least 40 mL of sample
in a 50-mL beaker.
)
3