Hach DR/700 Procedures Manual page 477

DEHA
(N,N-Diethylhydroxylamine)
For boiler water
Iron Reduction Method for Oxygen Scavengers
1.
Install module
number
55.01
in a DR/700.
Note: Samples must be
analyzed immediately
and cannot be store for
later analysis.
Note: Other oxygen
scavengers may be
determined by this
method if the result is
multiplied by the
appropriate factor. See
Other Oxygen
Scavengers following
these steps.
2.
Press:
I/O
The display will show
550 nm
and module number
55.01
55-29
Method 8140
(0 to 600 µg/L)
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
55.06.1