Hach DR/700 Procedures Manual page 373

CHLORINE, FREE
For water, wastewater and seawater
DPD Method* (Powder Pillows or AccuVac Ampuls),
USEPA accepted for reporting**
USING POWDER PILLOWS
1.
Install module
52.01
in a DR/700.
Note: Samples must be
analyzed immediately
and cannot be preserved
for later analysis.
4.
Fill a 10-mL cell
to the 10-mL line
with sample (the
blank). Cap.
Note: A 25-mL sample
can be tested by using
25-mL cells and
optional reagents.
*Adapted from Standard Methods for the Examination of Water and Wastewater
**Procedure is equivalent to USEPA method 330.5 for wastewater and Standard Method
4500-Cl G for drinking water.
(0 to 2.00 mg/L)
2.
Press:
l/O
The display will show
525 nm
and module number
52.01
5.
Place the blank in
the cell holder.
Note: In bright light it
may be necessary to
close the cell
compartment cover.
52-47
Method 8021
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
52.05.1
6.
Press: ZERO
The display will
count down to 0.
Then the display will
show 0.00 mg/L and
the zero prompt will
turn off.