Hach DR/850 Procedures Manual page 127

Colorimeter
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CHLORINE, TOTAL,
Using AccuVac Ampuls
1.
Enter the stored
program number for
total chlorine (Cl
)
2
AccuVac Ampuls.
Press:
PRGM
The display will show:
PRGM ?
Note: For most accurate
results, perform a Reagent
Blank Correction using
deionized water (see
Section 1).
5.
Press:
ZERO
The cursor will move to
the right, then the
display will show:
0.00 mg/L Cl2
Note: If Reagent Blank
Correction is on, the
display may flash "limit".
See Section 1.
continued
2.
Press:
11 ENTER
The display will show
mg/L, Cl2 and the
ZERO icon.
6.
Fill a DPD Total
Chlorine Reagent
AccuVac Ampul
with sample.
Note: Keep the tip
immersed while the ampule
fills completely.
3.
Fill a sample cell
with at least 10 mL of
sample (the blank).
Collect at least 40 mL of
sample in a 50-mL
beaker.
Note: Samples must be
analyzed immediately and
cannot be preserved for
later analysis.
7.
Quickly invert the
ampule several times to
mix. Wipe off any liquid
or fingerprints.
Note: A pink color will
form if chlorine is present.
127
4.
Place the blank into
the cell holder. Tightly
cover the sample cell
with the instrument cap.
8.
Press:
TIMER ENTER
A three-minute reaction
period will begin.

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