Hach DR/700 Procedures Manual page 251

CYANURIC ACID
For water
Turbidimetric Method*
1.
Fill a 25-mL cell
to the 25-mL line
with sample.
Note: Filtering is
required for highly
colored or turbid
samples. Use the
labware listed under
Optional Apparatus.
Large amounts of color
or turbidity will
interfere and cause high
readings.
Note: The DR/700 must
be calibrated before
sample analysis. See
Calibration following
these steps.
*User calibration required. Range is approximate.
(0 to 50 mg/L)
2.
Install module
50.01
in a DR/700.
50-1
Method 8139
3.
Press:
I/O
The display will show
500 nm
and module number
50.01