Hach DR/700 Procedures Manual page 165

SILICA, HR
For water and wastewater
Silicomolybdate Method*
1.
Install module
42.01
in a DR/700.
Note: If samples cannot
be analyzed
immediately, see
Sampling and Storage
following these steps.
*Adapted from Standard Methods for the Examination of Water and Wastewater.
(0 to 40 mg/L)
2.
Press:
I/O
The display will show
420 nm
and module number
42.01
42-81
Method 8185
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 lower
display shows
program number
42.09.1