Hach DR/700 Procedures Manual page 293

NITRITE, LR
For water, wastewater and seawater
Diazotization Method (Powder Pillows or AccuVac Ampuls);
USEPA accepted for reporting*
USING POWDER PILLOWS
1.
Install module
number
50.01
in a DR/700
Note: If sample cannot
be analyzed
immediately, see
Sampling and Storage
following these steps.
*Federal Register, May 1, 1979, 44(85), 25505
(0 to 0.350 mg/L NO
2.
Press:
I/O
The display will show
500 nm
and module number
50.01
50-43
Method 8507
-
N)
-
2
3.
After 2 seconds,
the display will show
a program number,
the concentration
units, decimal
position and the zero
prompt. If necessary,
press the
UP ARROW
key until the lower
display shows
program number
50.08.1