Hach DR/850, Procedures Manual, Page: 149 / 460

149
CHLORINE DIOXIDE,
continued
Using AccuVac
®
Ampuls
1.
Enter the stored
program number for
chlorine dioxide (ClO
2
)
AccuVac Ampuls.
Press:
PRGM
The display will show:
PRGM ?
2.
Press:
113 ENTER
The display will show
mg/L, ClO2 and the
ZERO icon.
3.
Fill a sample cell
with at least 10 mL of
sample (the blank). Fill a
50-mL beaker with
40 mL of sample. Using
the correct sample
volume is important.
Note: Samples must be
analyzed immediately and
cannot be preserved for later
analysis.
Note: Wipe off any liquid or
fingerprints before inserting
the sample cell into the
instrument.
4.
Place the blank into
the cell holder. Tightly
cover the sample cell
with the instrument cap.
Note: For best results, run a
reagent blank using
deionized water as the
sample. Subtract the blank
value from the sample
reading to obtain the final
result. See
Reagent Blank
Correction in Section 1 of the
DR/800 Procedure Manual.
5.
Press:
ZERO
The cursor will move to
the right, then the
display will show:
0.00 mg/L ClO2
Note: If Reagent Blank
Correction is on, the display
may flash “limit”. See
Section 1 of the DR/800
Procedures Manual.
6.
Add 16 drops of
Glycine Reagent to the
sample in the beaker.
Swirl to mix.
7.
Fill a DPD Free
Chlorine Reagent
AccuVac Ampul
with sample.
Note: Keep the tip immersed
while the ampul fills
completely.
Note: Perform step 10 within
one minute of reagent
addition.
8.
Quickly invert the
ampul several times to
mix. Wipe off any liquid
or fingerprints.
Note: A pink color will form
if chlorine dioxide is present.