Hach DR/700 - Page 617

61-61
Method 8316
OXYGEN, DISSOLVED, LR (0 to 1000 µg/L O
2
)
For boiler feedwater
Indigo Carmine Method (Using AccuVac Ampuls)
1. Install module
61.01
in a DR/700.
Note: Samples must be
analyzed on site and
cannot be stored; see
Sampling and Storage
following this
procedure.
2. Press: I/O
The display will show
610 nm
and module number
61.01
3. After 2 seconds,
the display will show
a program number,
concentration units,
decimal position and
the zero prompt. If
necessary, press the
UP ARROW key
until the lower
display shows
program number
61.07.1
4. Fill a cell with
10 mL of sample (the
blank). Cap. Fill a
blue ampul cap with
sample. Collect at
least 40 mL of sample
in a 50-mL beaker.
5. Place the blank in
the cell holder.
Note: In bright light it
may be necessary to
close the cell
compartment cover.
6. Press: ZERO
The display will
count down to 0.
Then the display will
show 0.00 µg/L and
the zero prompt will
turn off.
AccuVac is a Hach Company trademark.